Relevant bibliographies by topics / Zeolite

Academic literature on the topic 'Zeolite'

Author: Grafiati

Published: 4 June 2021

Last updated: 21 September 2024

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Journal articles on the topic "Zeolite"

Mellyanawaty, Melly, Firda Mahira Alfiata Chusna, and Estin Nofiyanti. "Proses Peruraian Anaerobik Palm Oil Mill Effluent dengan Media Zeolit Termodifikasi." Jurnal Rekayasa Proses 13, no. 1 (July 1, 2019): 16. http://dx.doi.org/10.22146/jrekpros.39206.

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A B S T R A C TThis work evaluated the effect of modified zeolite as microbial immobilization medium in anaerobic digestion of palm oil mill effluent (POME). The affinity of microorganisms to attach and grow on the media surface could be increased by the addition of micro-nutrient into the media. The effect of micro-nutrient addition was studied in 1000 mL Erlenmeyer flask as batch reactors. Experiments were conducted for 30 days. The concentration of soluble chemical oxygen demand (COD) in substrate was 8000 mg/L. Zeolite was impregnated with nickel (Ni) and zinc (Zn) at individual concentration of 2.7x10-3 mg Ni/g zeolite and 3.5x10‑3 mg Zn/g zeolite. The influence of each modified zeolite was determined by periodic measurement of sCOD, volatile fatty acid (VFA), pH, and biogas production. Cumulative biogas productions in this study were 252.44; 172.13; 57.70 ml from Ni-modified, Zn-modified and natural zeolites, respectively. The highest sCOD removal was obtained in reactor with Zn-modified zeolite with 38.22% removal, followed by 33.96% with Ni-modified zeolite, and 27.87% removal with natural zeolite.Keywords: anaerobic digestion; biogas; methane; palm oil mill effluent; zeoliteA B S T R A KPenelitian ini mengevaluasi pengaruh zeolit yang dimodifikasi sebagai media imobilisasi mikroorganisme pada proses anaerobik limbah palm oil mill effluent (POME). Afinitas mikroorganisme untuk melekat dan tumbuh di permukaan dapat meningkat dengan impregnasi mikronutrien pada media. Efek penambahan mikronutrien dipelajari dengan labu Erlenmeyer 1000 mL sebagai reaktor batch. Experimen dijalankan selama 30 hari. Konsentrasi soluble chemical oxygen demand (sCOD) substrat yang digunakan adalah 8000 mg/L. Zeolit terimpregnasi Ni dan Zn yang digunakan memiliki kadar 2,7 x10-3 mg Ni/g zeolit dan 3,5x10-3 mg Zn/g zeolit. Pengaruh setiap zeolit yang dimodifikasi dievaluasi dengan mengukur konsentrasi sCOD, volatile fatty acid (VFA), pH, dan produksi biogas secara periodik. Akumulasi biogas penelitian ini sebesar 252,44; 172,13; 57,70 ml berturut-turut untuk zeolit modifikasi Ni, zeolit modifikasi Zn dan zeolit alam. Penurunan sCOD terbaik dihasilkan oleh zeolit termodifikasi Zn dengan nilai 38,22%, selanjutnya diikuti oleh zeolit termodifikasi Ni dan zeolit alam dengan nilai 33,96% dan 27,87%.Kata kunci: anaerobic digestion; biogas; metana; palm oil mill effluent; zeolit

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Sugiarti, Sri, Charlena Charlena, and Nurul Afiati Aflakhah. "Zeolit Sintetis Terfungsionalisasi 3-(Trimetoksisilil)-1-Propantiol sebagai Adsorben Kation Cu(II) dan Biru Metilena." Jurnal Kimia VALENSI 3, no. 1 (May 31, 2017): 11–19. http://dx.doi.org/10.15408/jkv.v3i1.5144.

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The more commonly used method for making synthetic zeolite from kaolin is hydrothermal method. This research tested a sol-gel method in processing synthetic zeolit using kaolin as the basic ingrediant. The synthetic zeolite derived from the sol-gel method was then characterized using X-ray Difractometer and Scanning Electron Microscope, which found resulting products zeolite-A, zeolite Y and sodalite. The adsorption ability of the synthetic zeolites was tested using Cu(II) and methylene blue. Functionalization of the synthetic zeolites by 3-(trimetoksisilil)-1-propantiol was done to increase adsorption capacity. Zeolite A modified by 3-(trimetoksisilil)-1-propantiol had the greater capacity to adsorb methylene blue at 30.11 mg/g. The adsorption isotherms of all the synthetic zeolites approached the Langmuir form. The adsorption energy off all synthetic zeolites approached the chemical adsorption.DOI: http://dx.doi.org/10.15408/jkv.v0i0.5144

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Elysabeth, Tiur, Zulnovri, Gina Ramayanti, Setiadi, and Slamet. "Modification of Lampung and Bayah Natural Zeolite to Enhance the Efficiency of Removal of Ammonia from Wastewater." Asian Journal of Chemistry 31, no. 4 (February 27, 2019): 873–78. http://dx.doi.org/10.14233/ajchem.2019.21810.

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In this research, modification of Lampung and Bayah natural zeolites was carried out to increase the zeolite’s capacity as an ammonia adsorbent. Natural zeolite is modified by acid treatment using 6 M HCl and ion exchange using 1 M NH4NO3. The modification process continued with calcination at 500 °C for 4 h. X-ray fluorescence characterization shows changes in composition in the modified zeolites. The significant increase in the Si/Al ratio occurred in the modified zeolite with acid treatment that is 10.03 for Lampung natural zeolite HCl (LNZH) and 9.20 for Bayah natural zeolite HCl (BNZH). Surface area increases due to increasing Si/Al ratio. FTIR results indicate changes in the intensity of hydroxyl groups and pyrH+ as a result of the increase in total acidity of zeolites. The zeolites performance test proves that the Bayah natural zeolite has a higher ammonia adsorption capacity than Lampung natural zeolite. Ion exchange-modified zeolite has a higher ammonia adsorption capacity than zeolite modified with acid treatment.

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Hakiki, Muhammad, Muhammad Makiyi, Nuryoto Nuryoto, Rahmayetty Rahmayetty, Indar Kustiningsih, and Teguh Kurniawan. "Pengaruh Lokasi Zeolit Alam Bayah terhadap Adsorpsi Amonium: Studi Kinetika dan Kesetimbangan." Jurnal Teknologi Lingkungan 22, no. 1 (February 3, 2021): 018–28. http://dx.doi.org/10.29122/jtl.v22i1.4403.

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ABSTRACT Household waste is one of the most significant contributors to wastewater that can pollute the environment, one of which is ammonium pollution. Ammonium pollution can be reduced by natural zeolite by using the adsorption method. This research aims to utilize natural zeolite as an adsorbent that can reduce ammonium levels in wastewater, determine which natural zeolite has the most significant adsorption power from 4 locations, determine natural zeolite characterization of Bayah. This study is also to create a model equilibrium equations and reaction kinetics from the adsorption method. The method used is the adsorption method, X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Brunauer-Emmett-Teller (BET). This study's results were that natural zeolites location 4 could adsorb 99.25% of ammonium and showed the highest adsorption capacity of ammonium. Characterization using XRD analysis obtained the types of zeolite mordenite, clinoptilolite, quartz, and heulandite. The surface area of Bayah natural zeolite in the 4th location is 46 m2/g. The suitable equilibrium model for the adsorption of ammonium by natural zeolites is the Freundlich model. The most suitable adsorption kinetics model for the adsorption of ammonium by Bayah natural zeolites is the pseudo-first-order model. Keywords: household waste, ammonium, eutrophication, natural zeolites ABSTRAK Limbah rumah tangga adalah salah satu penyumbang limbah cair terbesar yang dapat mencemari lingkungan salah satunya pencemaran amonium. Pencemaran amonium dapat dikurangi dengan zeolit alam dengan menggunakan metode adsorpsi. Tujuan dari penelitian ini adalah menentukan zeolit alam yang memiliki daya adsorpsi terbesar dari 4 lokasi berbeda, melakukan karakterisasi zeolit alam Bayah, dan memodelkan persamaan kesetimbangan dan kinetika reaksi adsorpsi amonium. Karakterisasi zeolit dilakukan dengan analisis X-ray diffraction (XRD), Scanning Electron Microsope (SEM), dan luas permukaan material menggunakan model Brunauer-Emmett-Teller (BET). Hasil dari penelitian ini adalah zeolit alam lokasi 4 memiliki kapasitas adsorpsi amonium paling besar, yaitu 9,25%. Adapun kapasitas adsorpsi amonium yang paling besar ditunjukkan oleh zeolit alam Bayah lokasi 4. Analisis XRD menunjukkan bahwa seluruh zeolit Bayah merupakan zeolit bertipe mordenit, klinoptilolit, dan heulandit dengan fasa pengotor quartz. Luas permukaan zeolit alam Bayah lokasi 4 sebesar 46 m2/g. Model kesetimbangan yang sesuai untuk adsorpsi amonium oleh zeolit alam Bayah yaitu model Freundlich. Model kinetika adsorpsi yang paling sesuai untuk adsorpsi amonium oleh zeolit alam Bayah yaitu model kuasi orde satu. Kata Kunci: limbah rumah tangga, amonium, eutrofikasi, zeolit alam

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Kalista, Nadia Nanda, Rahmana Emran Kartasasmita, Marlia Singgih Wibowo, and Lenny Marilyn Estiaty. "KARAKTERISASI DAN PEMURNIAN ZEOLIT ALAM LAMPUNG SEBAGAI KANDIDAT ANTIDOTUM KERACUNAN TIMBAL." Acta Pharmaceutica Indonesia 42, no. 2 (December 27, 2017): 84–91. http://dx.doi.org/10.5614/api.v42i2.5656.

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Indonesia memiliki kelimpahan zeolit yang berpotensi dapat dikembangkan sebagai zeolit yang berderajat farmasi. Penelitian ini bertujuan untuk mendapatkan zeolit olahan dengan karakteristik yang cocok sebagai bahan baku farmasi. Zeolit alam diproses dengan cara pencucian menggunakan masing-masing larutan HCl, aquabidest, dan EDTA lalu diikuti dengan pemanasan pada 350 °C. Sebelum dan sesudah pengolahan sampel zeolit dikarakterisasi menggunakan berbagai metode instrumental. Selanjutnya, zeolit olahan diuji kemampuannya untuk menjerap parasetamol dan timbal. Hasil analisis menunjukkan bahwa komposisi sampel zeolit > 91% berjenis klinoptilolit dengan kandungan utama unsur Si, Al dan K. Setelah pencucian dengan larutan HCl 1 M, EDTA 0,1 M dan aquabidest, kadar As dalam masing-masing sampel zeolit 4,12 ± 0,75 ppm, < 0,1 ppm dan 11,8 ± 0,56 ppm dan kadar Pb untuk seluruh sampel < 1 ppm, sedangkan Cd dari semua sampel < 1 ppm. Tidak ada perubahan struktur dalam sampel zeolit yang teramati setelah proses pencucian dan pemanasan. Zeolit yang dicuci dengan larutan EDTA mampu menjerap Pb dalam cairan lambung buatan tanpa pepsin secara efektif dengan penurunan kadar hingga 89% namun tidak mampu menjerap parasetamol secara efektif. Disimpulkan bahwa hasil proses zeolit menunjukkan karakteristik yang cocok sebagai kandidat bahan baku farmasi. Zeolit yang diberi perlakuan dengan EDTA mampu menjerap Pb secara efektif sehingga berpeluang digunakan sebagai antidot lokal dalam kasus keracunan Pb akut.Kata kunci: zeolit, klinoptilolit, logam berat. CHARACTERIZATION AND PURIFICATION OF NATURAL LAMPUNG ZEOLITE AS A CANDIDATE OF ANTIDOTE OF LEAD INTOXICATIONABSTRACTIndonesia has the abundance potential of zeolites having possibility to be developed as pharmaceutical grade zeolites. This research aimed to obtain processed zeolite showing suitable characteristics as pharmaceutical ingredient. Natural zeolite was processed by means of washing using dilute HCl, aquabidest and EDTA solutions, respectively and subsequently followed by heating at 350 oC. Prior and after processing, the zeolite samples were characterized using various instrumental methods. Furthermore, the processed zeolite was tested for its ability to adsorb paracetamol and lead. The analysis results confirmed that the composition of zeolite samples were > 91% of clinoptilolite mainly composed of Si, Al and K. After washing with 1 M HCl, 0.1 M EDTA and aquabidest, the level of As in each of zeolite samples were 4.12 ± 0.75 ppm, < 0.1 ppm and 11.8 ± 0.56 ppm and those of Pb were all < 1 ppm, while those of Cd from all samples were < 1 ppm, respectively. No structural changes in zeolite samples were observed after washing and heating treatment. EDTA treated zeolite was able to adsorb Pb in artificial gastric fluid without pepsin effectively up to 89% reduction but failed to adsorb paracetamol effectively. It was concluded that processed natural zeolite was suitable as a pharmaceutical ingredient. EDTA-treated zeolite was able to adsorb Pb effectively and hence could be possibly applied as local antidote in the case of acute Pb intoxication.Keywords: zeolite, clinoptilolite, heavy metals.

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Nursanti, Ida, and Nida Kemala. "Peranan Zeolit dalam Peningkatan Kesuburan Tanah Pasca Penambangan." Jurnal Media Pertanian 4, no. 2 (November 11, 2019): 88. http://dx.doi.org/10.33087/jagro.v4i2.84.

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ABSTRACTPost-mining soils have poor chemical and physical properties and have very low fertility rates. The study aims to determine the best dose of zeolite in order to improve soil fertility after mining as a planting medium. The experiment was carried out experimentally by giving zeolites (Z) and 3 treatment levels, namely: Z0 = without zeolites, Z1 = zeolites 100 g, Z2 = zeolites 200 g. There were 3 replications, so 9 unit experiments were obtained. The final analysis of research on soil chemistry consists of; Available P, total N, K-exs, C-organic and CEC, pH. Data analysis of the diversity of characteristics of post-mining soil types is presented in tabular form and discussed descriptively. Provision of 200 grams zeolite of 10 kg post-mining land (equivalent to 20 tons Ha-1 of zeolite ) and incubated for eight weeks can increase soil pH, total N, K-dd, available P andCECsoil. Keywords: Zeolites and post-mining soils ABSTRAKTanah pasca penambangan memiliki sifat kimia dan fisik yang kurang baik serta memiliki tingkat kesuburan yang sangat rendah. Penelitian bertujuan mengetahui menentukan dosis zeolit terbaik agar dapat memperbaiki kesuburan tanah pasca penambangan terkait sebagai media tanam. Percobaan dilakukan secara eksperimen dengan pemberian zeolit (Z) dan 3 taraf perlakuan yaitu :Z0= tanpa zeolit, Z1 = zeolit 100 g, Z2 = zeolit 200 g. Terdapat 3 ulangan, sehingga diperoleh 9 unit percobaan. Analisis akhir penelitian terhadap kimia tanah terdiri dari; P tersedia, N total, K-dd, C-organik dan KTK, pH. Analisis data keragaman karakteristik jenis tanah pasca penambangan disajikan dalam bentuk tabel dan dibahas secara deskriptif. Pemberian zeolit 200 gram per 10 kg tanah pasca tambang (setara 20 ton zeolit per Ha) dan diinkubasi selama delapan minggu dapat meningkatkan pH tanah, N-total, K-dd, P tersedia dan KTK tanah. Kata kunci : Zeolit dan tanah pasca penambangan.

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Purnamaningsih, Nur'aini, Endah Retnaningrum, and Wahyu Wilopo. "PEMANFATAAN KONSORSIUM BAKTERI PEREDUKSI SULFAT DAN ZEOLIT ALAM DALAM PENGENDAPAN LOGAM Mn." Jurnal Penelitian Saintek 22, no. 1 (August 28, 2017): 37. http://dx.doi.org/10.21831/jps.v22i1.15311.

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Tujuan dari penelitian ini adalah untuk mengetahui pengaruh penambahan zeolit alam Wonosari terhadap aktivitas Bakteri Pereduksi Sulfat dalam pengendapan logam Mn skala continous culture dan mengidentifikasi karakter biofilm Bakteri Pereduksi Sulfat oleh aktivitas konsorsium Bakteri Pereduksi Sulfat pada zeolit alam dalam skala continous culture. Tahap penelitian meliputi aktivasi zeolit, pengujian aktivitas konsorsium Bakteri Pereduksi Sulfat dalam skala continous culture; serta karakterisasi biofilm konsorsium Bakteri Pereduksi Sulfat. Konsorsium Bakteri Pereduksi Sulfat yang digunakan berasal dari kotoran kambing. Zeolit yang digunakan pada pengujian aktivitas konsorsium Bakteri Pereduksi Sulfat adalah zeolit alam Wonosari yang berukuran 0,8-1,2 cm. Hasil penelitian menunjukkan bahwa konsorsium Bakteri Pereduksi Sulfat pada bioreaktor dengan penambahan zeolit mempunyai aktivitas yang lebih efektif dibandingkan dengan bioreaktor tanpa penambahan zeolit, dimana pH meningkat menjadi pH 6,9; efisiensi pengendapan logam Mn sebesar 61,16%, serta nilai MPN yang lebih tinggi. Zeolit dalam bioreaktor dengan waktu pembentukan biofilm 5 hari dan 9 hari terlihat adanya biofilm konsorsium Bakteri Pereduksi Sulfat yang tumbuh melekat pada permukaan zeolit. The objective of this study were determining the effects of natural zeolite from Wonosari on the activites of Sulfate Reducing Bacteria in Mangan (Mn) sedimentation of continous culture scale, and identifying the biofilm character of Sulfate Reducing Bacteria on consortium activites on natural zeolite using continous culture scale. The first studies was activation of zeolites, followed by testing the activity of consortium activities of Sulfate Reduction Bacteria in continuous culture scales; and biofilm characterization of Sulfate Reducing Bacteria consortium. The consortium of Sulfate Reducing Bacteria derived from goat feces. The size of zeo natural zeolites used in the consortium activity test of Sulfate Reducing Bacteria in Mangan sedimentation was 0.8 to 1.2 cm. The results showed that the consortium of Sulfate Reducing Bacteria in the bioreactor with the addition of zeolite had an activity that was more effective than the bioreactor without the addition of zeolite, where the pH was increased to pH 6.9; Mangan sedimentation was 61,16%, and the higher MPN index. Zeolite in a bioreactor with biofilm formation in 5th days and 9th days seems that there were biofilm consortium of Sulfate Reducing Bacteria growing attached to the surface of the zeolite.

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Rentsenorov, Ulambayar, Batmunkh Davaabal, and Jadambaa Temuujin. "Synthesis of Zeolite A from Mongolian Coal Fly Ash by Hydrothermal Treatment." Solid State Phenomena 271 (January 2018): 1–8. http://dx.doi.org/10.4028/www.scientific.net/ssp.271.1.

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Raw coal fly ash and acid pretreated fly ash were used to synthesize A-type zeolite by hydrothermal treatment. In order to synthesize zeolite A an aqueous gel having a molar batch composition of Na2O:Al2O3:1.926SiO2:128H2O was utilized. Fly ash and zeolitic products were characterized by SEM, XRF, XRD and cation exchange capacity (CEC). After hydrothermal treatment, several types of zeolites were formed: zeolite A, analcime, faujasite and hydroxy-sodalite. The highest content of zeolite A was formed in the mixture treated at 80°C for 8 hours. CEC values of the zeolitic products were 28-38 times higher than that of in raw fly ash. Acid pretreatment which leads to low calcium and iron content is preferable method for processing of fly ash for the zeolite synthesis. Synthesized zeolite can be used for ion exchangers for water treatment.

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Trivana, Linda, Sri Sugiarti, and Eti Rohaeti. "SYNTHESIS OF ZEOLITE AND COMPOSITE OF ZEOLITE/TiO2 FROM KAOLIN AND ITS APLICATION TO ADSORPTION-PHOTODEGRADATION OF METHILEN BLUE." ALCHEMY Jurnal Penelitian Kimia 11, no. 2 (September 27, 2016): 147. http://dx.doi.org/10.20961/alchemy.11.2.722.147-162.

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In this study, zeolite was synthesized from kaolin which was founded from Bangka Belitung as the starting material. Meanwhile, sodium silicate was used as silica source. Zeolite is material with many benefits, such as become an adsorbent. Kaolin has been used as starting material due to high content of silica and alumina, i.e 35 - 50 %. Zeolite was prepared by hydrothermal synthesis process, by mixing the metakaolin which was produced by calcination of kaolin at 700 °C for 6 hours, with sodium silicate and NaOH. The NaOH was used to activate the major components of Si and Al in the kaolin.The hydrothermal process was conducted at 100 °C for 24 hours with various concentrations of NaOH, i.e 1.5 N and 2.5 N. The NaOH concentration might determine the type of zeolite obtained. To improve the nature as adsorbent, zeolites modified into zeolit/TiO2. The addition of TiO2into the prepared zeolit aimed to produce a material with capability as adsorbent-photocatalyst. The result of research found that the addition of NaOH 1.5 N produced zeolite NaP1. Meanwhile, the addition of NaOH 2.5 N produced the NaP1 zeolite, zeolite X, and faujasite. The composite of zeolit/TiO2has ability on adsorption-photocatalytic as it was proven by methylene blue degradation under ultraviolet light.

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Dissertations / Theses on the topic "Zeolite"

Simancas, Coloma Jorge. "Synthesis and Characterization of Zeolitic Materials Using Phosphorous Organic Structure Directing Agents." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/171267.

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[ES] Las zeolitas son materiales cristalinos microporosos con canales y tamaños de poro de dimensiones moleculares. La estructura y composición de las zeolitas les confiere interesantes propiedades que permiten su aplicación en una amplia gama de aplicaciones industriales como adsorción, separación o catálisis. La síntesis de zeolitas es la etapa más importante para el control de la estructura y composición de las zeolitas y, por tanto, crítica para la optimización de sus propiedades. Esta tesis se ha centrado en la síntesis de zeolitas utilizando compuestos que contienen fósforo (cationes fosfonio y aminofosfonio) como Agentes Directores de Estructura (P-ADE). El uso de compuestos fosforados influye en la cristalización y propiedades de las zeolitas obtenidas en comparación con las zeolitas obtenidas con cationes de amonio clásicos. Los compuestos fosforados se eligieron debido a su diferente química y estabilidad con respecto a los cationes de amonio clásicos comúnmente usados en la síntesis de zeolitas. Estos aspectos se estudiaron con un estudio comparativo de diferentes cationes de amonio y fosforados. Los compuestos de fósforo utilizados en este trabajo han dado lugar a nuevas estructuras cristalinas (ITQ-58 e ITQ-66) y han abierto nuevas vías de síntesis de zeolitas ya conocidas (RTH, IWV y DON), ampliando su gama de composiciones químicas. La descomposición térmica de los P-ADE confinados dentro de las zeolitas da lugar a la formación de especies de fósforo extra-red que permanecen dentro de los canales y cavidades de las zeolitas. Estas especies modulan las propiedades ácidas y de adsorción de los materiales finales dependiendo de los tratamientos post-síntesis. En este trabajo se ha estudiado una ruta para la incorporación de cantidades controladas de fósforo durante la etapa de síntesis. Esto ha permitido controlar la adsorción y las propiedades ácidas en las zeolitas de poro pequeño, lo que no se puede lograr mediante metodologías de post-síntesis.
[CA] Les zeolites són materials cristal·lins microporosos amb canals i mides de porus de dimensions moleculars. L'estructura i composició de les zeolites els confereix interessants propietats que permeten la seua aplicació en una àmplia gamma d'aplicacions industrials com adsorció, separació o catàlisi. La síntesi de zeolites és l'etapa més important per al control de l'estructura i composició de les zeolites i, per tant, crítica per a l'optimització de les seues propietats. Aquesta tesi s'ha centrat en la síntesi de zeolites utilitzant compostos que contenen fòsfor (cations fosfoni i aminofosfoni) com a agents directors d'estructura (P-ADE). L'ús de compostos fosforats influeix en la cristal·lització i propietats de les zeolites obtingudes en comparació amb les zeolites obtingudes amb cations d'amoni clàssics. Els compostos fosforats es van triar a causa de la seua diferent química i estabilitat pel que fa als cations d'amoni clàssics utilitzats en la síntesi de zeolites. Aquests aspectes s¿estudiaren amb un estudi comparatiu de diferents cations d'amoni i fosforats. Els compostos de fòsfor utilitzats en aquest treball han donat lloc a noves estructures cristal·lines (ITQ-58 i ITQ-66) i han obert noves vies de síntesi de zeolites ja conegudes (RTH, IWV i DO), ampliant la seua gamma de composicions químiques. La descomposició tèrmica dels P-ADE atrapats dins de les zeolites dona lloc a la for-mació d'espècies de fòsfor extra-xarxa que romanen dins dels canals i cavitats de les zeolites. Aquestes espècies modulen les propietats àcides i d'adsorció dels materials finals depenent dels tractaments post-síntesi. En aquest treball s'ha estudiat una ruta per la incorporació de quantitats controlades de fòsfor durant l'etapa de síntesi. Això ha permés controlar l'adsorció i les propietats àcides en les zeolites de porus petit, el que no es pot aconseguir mitjançant metodologies de post-síntesi.
[EN] Zeolites are microporous crystalline materials with channels and pore openings of molecular dimensions. The structure and composition of zeolites confers them interesting properties that allow their application in a wide range of industrial applications as adsorption, separation or catalysis. The synthesis of zeolites is the most important stage to control the structure and composition of zeolites, and thus, critical to optimize their properties. This thesis has been focused on the synthesis of zeolites using phosphorous containing compounds (phosphonium and aminophosphonium cations) as Organic Structure Directing Agents (P-OSDA). The use of these phosphorous compounds influence the crystallization and properties of the obtained zeolites compared to zeolites obtained with classical ammo-nium cations. Phosphorous compounds were chosen because of their different chemistry and stabil-ity properties respect to classical ammonium cations commonly used in the synthesis of zeo-lites. These aspects were studied in a comparative study with different ammonium and phosphorous cations. The phosphorous compounds used in this work have yielded new crystalline structures (ITQ-58 and ITQ-66) and opened new routes for the synthesis of already known zeolites (RTH, IWV and DON), widening their chemical composition range. The thermal decomposition of the P-OSDAs entrapped inside the zeolites yields to the formation of extra-framework phosphorus species that remain inside the channels and voids of the zeolites. These species modulate the adsorption and acid properties of the final materials depending on the post-synthesis treatments. In this work, a route for the incorporation of controlled amounts of phosphorus during the synthesis stage has been studied. This has allowed to control the adsorption and acid properties in small pores zeolites, which cannot be achieved by post-synthesis methodologies.
I wish to firstly acknowledge the Spanish Government for the necessary funding for the FPI pre-doctoral fellowship (BES-2013-062999). Also, this thesis would not have been possible without the infrastructures provided by the UPV and the CSIC staff, fused into the ITQ. Furthermore, I want to acknowledge the Microscopy Service of the UPV for their support in sample microscopy characterization
Simancas Coloma, J. (2021). Synthesis and Characterization of Zeolitic Materials Using Phosphorous Organic Structure Directing Agents [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/171267
TESIS

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Wright, P. A. "The structure of zeolites and the zeolite-sorbate complex." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372290.

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Kovo, Abdulsalami Sanni. "Development of zeolites and zeolite membranes from Ahoko Nigerian kaolin." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/development-of-zeolites-and-zeolite-membranes-from-ahoko-nigerian-kaolin(3496e1fa-ece8-4781-be3f-a27a103f4c4a).html.

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Zeolites and zeolite membranes are two important advanced chemical materials which are widely used in chemical processes. The manufacture of these materials usually involves the use of expensive chemicals. This study involves the use of Ahoko Nigerian kaolin (ANK) as precursor material for the development of zeolites and zeolite membranes. The synthesis of zeolite A, Y and ZSM-5 was successfully obtained following a sequence, collection of the raw clay from Nigeria, metakaolinization, dealumination and actual hydrothermal synthesis of the zeolites. Raw ANK was refined using sedimentation technique and about 97% kaolin was recovered from the raw sample. A novel metakaolinization technique was developed to convert kaolin into a reactive metastable phase. Amorphous metakaolin was obtained at a temperature of 600°C and exposure time of 10 min. This is a significant result because previous studies use higher temperatures and longer exposure times for the metakaolinization step. The metakaolin was used to prepare a number of different zeolites under various conditions. Highly crystalline zeolite A was obtained at an ageing time of 12 h, crystallization time of 6 h and crystallization temperature of 100oC. Zeolite Y was obtained at an ageing time of 3 h, crystallization time of 9 h and crystallization temperature of 100oC. Zeolite Y was also synthesised by using a dealuminated kaolin and highly crystallized zeolite Y with Si/Al ratio of 1.56 and BET surface area was obtained of 630 m2/g. ZSM-5 was synthesised using an ageing period of 36 h, crystallization time of 48 h and temperature of 140oC. The results obtained from zeolite powder synthesis from ANK were then used as guide to prepare supported zeolite films and membranes by a hydrothermal method. The effect of the support surface (stainless steel) was investigated using two synthesis methods namely modified in-situ and secondary (seeded) growth. Zeolite A, Y and ZSM-5 films were successfully prepared from ANK for the first time and on two modified supports, etched and oxidised. The zeolite films and membranes developed showed complete coverage on the two supports with the oxidised showing better adhesion and intergrowth. The separation performance of the three developed zeolite membrane was tested by pervaporation of water/ethanol mixture. The results of pervaporation of ethanol/water mixture showed that zeolite A membrane is highly selective towards water mainly because of hydrophilic properties occasioned by the high aluminium content. Zeolite Y membrane show a similar response when their separation performance was evaluated but with less selectivity because of reduced aluminium content. ZSM-5 showed selectivity towards ethanol because of it hydrophobicity allowing only ethanol to permeate. In all the zeolite membranes, the flux is lower in comparison to commercial zeolite membranes due mainly to the thickness of the zeolite layer. Oxidised support membranes showed better performance because of their better interaction between the oxide surface and the aluminosilicate gel. The results show that ANK can successfully be used to prepare zeolites and zeolite membrane.

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Cheung, Ocean. "Narrow-pore zeolites and zeolite-like adsorbents for CO2 separation." Doctoral thesis, Stockholms universitet, Institutionen för material- och miljökemi (MMK), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-101629.

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A range of porous solid adsorbents were synthesised and their ability to separate and capture carbon dioxide (CO2) from gas mixtures was examined. CO2 separation from flue gas – a type of exhaust gas from fossil fuel combustion that consists of CO2 mixed with mainly nitrogen and biogas (consists of CO2 mixed with mainly methane) were explicitly considered. The selected adsorbents were chosen partly due to their narrow pore sizes. Narrow pores can differentiate gas molecules of different sizes via a kinetic separation mechanism: a large gas molecule should find it more difficult to enter a narrow pore. CO2 has the smallest kinetic diameter in zeolites when compared with the other two gases in this study. Narrow pore adsorbents can therefore, show enhanced kinetic selectivity to adsorb CO2 from a gas mixture. The adsorbents tested in this study included mixed cation zeolite A, zeolite ZK-4, a range of aluminophosphates and silicoaluminophosphates, as well as two types of titanium silicates (ETS-4, CTS-1). These adsorbents were compared with one another from different aspects such as CO2 capacity, CO2 selectivity, cyclic performance, working capacity, cost of synthesis, etc. Each of the tested adsorbents has its advantages and disadvantages. Serval phosphates were identified as potentially good CO2 adsorbents, but the high cost of their synthesis must be addressed in order to develop these adsorbents for applications.

At the time of the doctoral defence the following papers were unpublished and had a status as follows: Papers 4-8: Manuscripts.

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Belkhair, Sama Salem. "Antimicrobial properties of Ag zeolites and Ag zeolite containing polymers." Thesis, Manchester Metropolitan University, 2016. http://e-space.mmu.ac.uk/617118/.

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Ag zeolites have been studied in this thesis for antibacterial applications in powder form or in composite materials. The influence of the textural characteristics (crystal size and mesoporosity) of silver-exchanged FAU- and BEA-type zeolites on their antimicrobial efficacy was studied. Two pairs of zeolite X and zeolite beta with different sizes as well as a mesoporous zeolite beta were tested against Escherichia coli (E. coli) and Candida albicans (C. albicans). Reduction of crystal size resulted in a slight decrease in the killing efficacy against both microorganisms. Zeolite beta showed higher activity than zeolite X despite the lower Ag content in that sample, which was attributed to the higher concentration of silver released from zeolite beta samples to the medium. Introduction of mesoporosity had a beneficial effect on the antimicrobial efficacy. Cytotoxicity measurements using peripheral blood mononuclear cells indicated that Ag zeolite X was more toxic compared to Ag beta, particularly the nanosized sample. The influence of the form of silver (metallic or ionic) on the antimicrobial efficacy was determined using Ag-loaded EMT zeolites. The killing efficacy of pure EMT, Ag+-EMT and Ag0-EMT against E. coli was studied semi-quantitatively. The antibacterial activity increased with increasing Ag content for both types of samples (Ag+-EMT and Ag0-EMT). The Ag0-EMT samples show slightly enhanced antimicrobial efficacy compared to that of Ag+-EMT, however, the differences are not substantial and the preparation of Ag nanoparticles is not viable considering the complexity of preparation steps. A multidisciplinary approach has been applied to the preparation of antibacterial Ag zeolite/silicone elastomer composites aimed at products that satisfy a range of requirements, namely good mechanical properties after zeolite incorporation and strongly antibacterial. The composites showed strong efficacy against E. coli and Staphylococcus epidermidis (S. epidermidis). Organic functionalisation of the zeolite with organo-silanes prior blending with the matrix usefully improved composite mechanical properties and reduced colour development in Ag zeolite containing silicone elastomers. The same approach was applied for the preparation of dental acrylic resins. Antibacterial dental resin containing Ag zeolites at loadings of 0.2, 0.4, 0.7 and 2 wt.% were prepared. The composites showed strong efficacy against E. coli and no viable E. coli were detected after 5 hours of incubation. The presence of Ag zeolites within the acrylic resin resulted in resin discolouration, which was more pronounced at high Ag zeolite loadings. A sustained Ag release over long periods of time (54 days) was observed with a greater Ag release in artificial saliva compared to that in distilled water. Dental resins loaded with Ag-free zeolites followed by post-fabrication insertion of Ag by ion-exchange were prepared to overcome discolouration. The materials prepared using this approach had a similar colour to that of the original polymer as determined by the colour measurements. These composites showed strong efficacy against E. coli and no viable E. coli cells were detected after 5 hours of incubation.

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Lee, Hyunjoo Davis Mark E. Davis Mark E. "A new strategy for synthesizing zeolites and zeolite-like materials /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05122005-144223.

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Huang, Wei. "Selective hydrogenation on zeolite-supported bimetallic catalysts." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 0.90 Mb., p. 76, 2005. http://proquest.umi.com/pqdlink?did=1037889271&Fmt=7&clientId=8331&RQT=309&VName=PQD.

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Uçar, Şule Yılmaz Selahattin. "Investigation Of Catalytic Activity And Selectivity Of Pd and Ni Loaded Clinoptilolite Rich Natural Zeolite For Citral Hydrogenation/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000122.doc.

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Wang, Bo. "TOWARDS COMMERCIALIZABLE FEATURED ZEOLITES - MESOPOROUS PARTICLES, NANOPARTICLES AND BENDABLE ZEOLITE MEMBRANES." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1478609347266087.

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Lydon, Megan Elizabeth. "Properties of inorganically surface-modified zeolites and zeolite/ polyimide nanocomposite membranes." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49069.

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Mixed matrix membranes (MMMs) consisting of a polymer bulk phase and an inorganic dispersed phase have the potential to provide a more selective membrane because they incorporate the selectivity of a zeolite dispersed phase while maintaining the ease of use of a polymer membrane. A critical problem in MMM applications is control over the polymer-zeolite interface adhesion during fabrication which can detrimentally impact membrane performance. In this work, MgOxHy (1≤x≤2, 0≤y≤2) nanostructures have been grown on pure-silica MFI and aluminosilicate LTA zeolites through four surface deposition techniques: Grignard decomposition reactions, solvothermal and modified solvothermal depositions, and ion-exchange induced surface crystallization. The structural properties of the surface nanostructures produced by each of the four methods were thoroughly characterized for their morphology, crystallinity, porosity, surface area, elemental composition, and these properties were used to predict the method’s suitability for use in composite membranes. The nanostructured zeolites were used in mixed matrix membranes (MMMs) at two MMMs weight loadings. The dispersion, mechanical properties, and CO₂/CH₄ gas separation properties were measured MMMs made with each method of functionalized LTA. All functionalization methods improve adhesion with the polymer observable by microscopy, the dispersion of particles, and the elastic modulus and hardness of the membrane. Gas permeation measurements prove the quality and effectiveness of the Ion Exchange membrane for CO₂/CH₄ separation by its significant increase in selectivity over the pure polymer. Lastly, the interface between the two materials was studied by probing the interfacial polymer mobility using NMR spin-spin relaxation measurements and mechanical mapping of membrane cross sections. It was shown that the nanostructures have both steric and chemical interactions with the polymer. Mapping of the elastic modulus indicated that functionalization methods that resulted in poorer zeolite coverage also disrupted the mechanical properties of the membrane at the interface of the materials. The investigations in this thesis provide detailed structure-property relationships of surface-modified molecular sieves and nanocomposite membranes fabricated using these materials, allowing a rational approach to the design of such materials and membranes.

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Books on the topic "Zeolite"

Chester, Arthur W., and E. G. Derouane. Zeolite characterization and catalysis: A tutorial. Dordrecht: Springer, 2009.

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Occelli, Mario L., and Harry E. Robson, eds. Zeolite Synthesis. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0398.

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1942-, Occelli Mario L., Robson Harry E. 1927-, American Chemical Society. Division of Colloid and Surface Chemistry., and American Chemical Society Meeting, eds. Zeolite synthesis. Washington, DC: American Chemical Society, 1989.

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Chester, Arthur W., and E. G. Derouane. Zeolite characterization and catalysis: A tutorial. Dordrecht: Springer, 2009.

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Takashi, Tatsumi, and Nishimura Yōichi 1932-, eds. Zeoraito shokubai kaihatsu no shintenkai. Tōkyō: Shīemushī Shuppan, 2004.

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Chester, Arthur W., and E. G. Derouane, eds. Zeolite Chemistry and Catalysis. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-9678-5.

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Ghassemi, M. R. Crystallization of zeolite A. Manchester: UMIST, 1995.

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Samsuddin, Rusnah Hj. Modification of zeolite y. Manchester: UMIST, 1994.

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Ch, Baerlocher, Meier W. M, Olson David, and Meier W. M, eds. Atlas of zeolite framework types. 5th ed. Amsterdam: Elsevier, 2001.

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Greatbanks, Stephen Paul. Theoretical studies of zeolite catalysis. Manchester: University of Manchester, 1995.

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Book chapters on the topic "Zeolite"

Bährle-Rapp, Marina. "Zeolite." In Springer Lexikon Kosmetik und Körperpflege, 599. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_11285.

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Urdă, Adriana, and Ioan-Cezar Marcu. "Zeolite." In New Frontiers in Nanochemistry, 515–30. Includes bibliographical references and indexes. | Contents: Volume 1. Structural nanochemistry – Volume 2. Topological nanochemistry – Volume 3. Sustainable nanochemistry.: Apple Academic Press, 2020. http://dx.doi.org/10.1201/9780429022944-46.

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Julbe, Anne, and Martin Drobek. "Zeolite Membrane." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_605-1.

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Julbe, Anne, and Martin Drobek. "Zeolite Membrane." In Encyclopedia of Membranes, 2056–57. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_605.

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Yang, Weishen, and Yanshuo Li. "Zeolite Membranes." In Inorganic Membranes for Energy and Environmental Applications, 275–86. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-34526-0_15.

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Skeels, Gary W., and Edith M. Flanigen. "Zeolite Chemistry." In ACS Symposium Series, 420–35. Washington, DC: American Chemical Society, 1989. http://dx.doi.org/10.1021/bk-1989-0398.ch029.

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Julbe, Anne, and Martin Drobek. "Zeolite A Type." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_604-1.

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Julbe, Anne, and Martin Drobek. "Zeolite T Type." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_606-1.

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Julbe, Anne, and Martin Drobek. "Zeolite X: Type." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_607-1.

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Julbe, Anne, and Martin Drobek. "Zeolite Y: Type." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_608-1.

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Conference papers on the topic "Zeolite"

Al Ghazawi, Ziad Deeb, and Esra�a Omar Al Diabat. "SALINITY REMOVAL OF RECLAIMED WASTEWATER USING NATURAL AND MODIFIED ZEOLITE AND NANO ZEOLITE PARTICLES." In 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/1.1/s02.018.

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Wastewater treatment and desalination are considered important solutions to meet the water scarcity in Jordan. The irrigation with reclaimed wastewater, that usually has elevated salinity levels, may adversely change soil structure, stability, and hydraulic properties. Water traditional desalination techniques require huge energy and capital investments. Zeolites in normal and nano scales enhance the desalination process performance and reduce its economic and energy requirements. In this study, batch experiments were conducted to investigate the salinity removal of reclaimed wastewater by using natural zeolite (Clinoptilolite), acid-treated zeolite as well as zeolites nanoparticles. The effect of salt�s initial concentrations, adsorbents mass, and pH on the adsorption process was determined. The results showed that potassium concentration was reduced by 75%, 76%, 81%, and 86% by using 5 g of natural zeolite, nano zeolite, acid-treated zeolite, and acid-treated nano zeolite, respectively. Also, water salinity was reduced by 17%, 12%, 18%, and 23% by using natural zeolite, nano zeolite, acid-treated zeolite, and acid-treated nano zeolite, respectively. It was observed that the nano zeolite performance was worse compared to the other zeolite types, but the acid treatment significantly enhanced the nano zeolite performance. Also, the highest removal efficiencies of potassium ions were achieved at neutral to slightly acidic pH (5-7). On the other hand, the nature of the adsorption process of salts onto zeolites surfaces was favorable and referred to a physical process. The kinetic adsorption was rapid and achieved within 5-10 minutes. It was found that the Langmuir, Freundlich, and Temkin isotherms and pseudo second order kinetic model were well fitted to the experimental data. It was concluded that the zeolite and its modified form in normal and nano scales can be widely used for salinity removal of reclaimed wastewater as effective adsorbents.

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Mimura, Hitoshi, Minoru Matsukura, Fumio Kurosaki, Tomoya Kitagawa, Akira Kirishima, and Nobuaki Sato. "Multi-Nuclide Separation Using Different Types of Zeolites." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66611.

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Development of selective adsorbents is very important subject for the effective multi-nuclide decontamination related to the severe accident of Fukushima Daiichi Nuclear power Station (Fukushima NPS). In this study, the adsorption properties for nine kinds of zeolites (Zeolite A, Zeolite X, Zeolite Y, Zeolite L, Modified Chabazite, Phillipsite, Erionite, Synthetic Mordenite, Natural Mordenite and Clinoptilolite) are evaluated in the presence of sodium salts, boric acid and seawater. The present study deals with (1) selective adsorption properties for single nuclide ions (Cs+, Sr2+, Eu3+, I−, UO22+, Am3+ and NpO2+), and (2) multi-nuclide adsorption properties of 26 elements (typical elements in Advanced Liquid Processing System (ALPS) in Fukushima NPP-1) for the above zeolites. The distribution coefficient (Kd, ml/g) and uptake (R, %) were estimated by batch method using NaI (Tl) scintillation counter, ICP-AES and AAS. Zeolites with different crystal structures have the diversity of the adsorption selectivity for various radioactive nuclides. Chabazite, mordenite and clinoptilolite with lantern or tunnel structure were very effective for the adsorption of monovalent Cs+ ions even in real seawater. Zeolite A and X with three-dimensional cage structures were effective for the adsorption of divalent Sr2+ and Co2+ ions under the practical condition (30% diluted seawater). Zeolite L was effective for the adsorption of Eu3+ ions under the practical condition. As for I− adsorption, Ag-zeolites are found to be effective, and the uptake (%) of I− (NaI in pure water) for Ag-zeolites was estimated to be above 98% in pure water. As for actinoid adsorption, the distribution profile, Kdvs pH, had a maximum depending on the hydrolysis pH. Zeolite A, Zeolite L and Zeolite X showed an excellent adsorption property for UO22+, Am3+ and NpO2+, respectively. Selective adsorption tendencies of different zeolites were evaluated for 26 elements referred to ALPS. Comparing the uptake results for different zeolites, the following tendency of adsorbability was observed. Mordenite had adsorption selectivity for monovalent alkali metal ions of Rb+ and Cs+. Zeolite A and X exhibited relatively high adsorption selectivity for divalent ions of Sr2+ and Co2+. Zeolite L had adsorption selectivity for trivalent lanthanide ions such as Ce3+ and Eu3+. These tendencies were the same as those without boric acid. Thus, the zeolites with diverse adsorption selectivity are effective for the multi-nuclide decontamination of radioactive contaminated water.

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Phuong, Nguyen Thi Truc, Cu Hoang Minh, Hung Hoa Lam, Ngo Tran Hoang Duong, and Long Quang Nguyen. "An Ultrafast and Green Synthesis of Mesoporous Zeolite X for Great Enhancement in Methylene Blue Adsorption." In 5th International Conference on Advanced Materials Science. Switzerland: Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-6rb9r6.

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Following the global trend of green material synthesis, the microwave-assisted acid leaching process has significantly reduced the treated time to introduce mesoporosity into zeolite FAU (type X). Instead of hours, mesoporous zeolite has appeared for 5 minutes only. The material's success was demonstrated by various characterizations like the hysteresis loops of the Nitrogen adsorption-desorption curves, the X zeolitic structure through X-ray diffraction (XRD) patterns, and the morphology by scanning electron microscopy (SEM) – energy dispersive X-ray (EDX) spectroscopy analysis. Less than 10 wt% of acetic acid concentration is enough to increase the zeolite's external surface area from 34.4 m2/g to 234.4 m2/g which indicates the formation of mesopores. Intending to enhance mesoporosity while minimizing microporous loss, 0.9 wt% acetic concentration corresponding to 172.6 m2/g external area value and 630 m2/g BET surface area value is prominent in the samples. In addition, mesopore enhancement has played an extreme role in significantly improving the methylene blue adsorption with molecular transport facilitation. Methylene blue adsorption results of all mesoporous zeolites were many times higher (2-6 times) than the original microporous sample under the same adsorption conditions.

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Watcharasing, Sunisa, Chularat Wattanakit, Saros Salakhum, Anittha Prasertsab, and Prapoj Kiattikomol. "Synthesis of Zeolites from Production Sand Waste: The Circular Model for Oil and Gas Exploration and Production." In Offshore Technology Conference Asia. OTC, 2022. http://dx.doi.org/10.4043/31420-ms.

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Abstract This project aims to convert production sand waste from oil & gas exploration & production process to be high value silica-based product, Zeolites, and explore opportunities to lower amount of sand waste disposal to landfill. This is one key item in Circular Model for Oil & Gas Exploration & Production. Zeolites is a microporous crystalline aluminosilicate material, which possess a superior characteristic in terms of high surface area. Therefore, it is widely utilized in many industries such as adsorbent, ion exchange, and catalysts in oil refining and petrochemical industry. In this work, various types of zeolites were synthesized from PTTEP production sand waste, to prove concept of turning sand waste to high value-added product, called zeolite. In normal operation, sand waste was sent to dispose as landfill about 50 Ton/annual. To synthesize zeolite from sand waste, there are three main steps, which are 1) Sand Pretreatment, 2) Silica Extraction, and 3) Zeolite Synthesis. Firstly, sand waste from petroleum production were pretreated by water and acid washing. Then, nanosilica was extracted out from pretreated sand by boiling the pretreated sand in NaOH solution at temperature 150 C for 4 hrs, then precipitate them to get the nanosilica substances. It was further used as a reactant source for zeolite synthesis. In the last step, the extracted silica was reacted with Structure Directing Agent (SDA); zeolite template, under optimal condition of hydrothermal treatment process to obtain zeolites product. Zeolites synthesis from production sand waste was firstly initiated and successfully achieved in lab phase, to prove of concept for extracting silica source as a substance for zeolite synthesis. Various types of zeolites (Silicalite-1, ZSM-5, Faujasite (FAU), Mordenite, and Zeolite A) can be synthesized from PTTEP sand waste with synthesis yield 80%, 68%, 85%, 40%, and 81%, respectively. This indicates that silica source from production sand waste can be utilized as a reactant source for zeolites synthesis. The next phase of prototype unit is under design phase, to allow unit can be operated more versatile, and automatically run. From this novel technology, it is expected to reduce an amount of production sand waste disposal out from separator to landfill about 50 Ton/year. The synthesized zeolites from prototype phase will be further applied in many potential applications such as an adsorbent in wastewater treatment process, as catalyst, and moisture adsorbent in oil & gas dehydration unit. New findings and requirements discovered during the prototype test will be used to iteratively optimize and improve the design of the sand to zeolites process for future industrial-scale implementation.

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Dzinun, Hazlini, and Mohd Hafiz Dzarfan Othman. "A Review on Modification of Zeolite for Photocatalytic Applications." In Conference on Center of Diploma Studies (CeDS) 2020/1. Penerbit UTHM, 2020. http://dx.doi.org/10.30880/mari.2020.01.01.002.

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Zeolites are microporous crystalline alumina-silicate materials, widely used as catalysts, ion exchangers and adsorbents due to their chemical structure and surface properties. The unique properties of zeolite such as high adsorption capacity and cation exchange make it interesting to be used as a support material. This review article presents the details of various researches of zeolite used as photocatalyst in photocatalytic application. The modifications of zeolite using several methods are described in details for photocatalytic enhancement. The effect of zeolite nanoparticles in membrane fabrication also provided in this article. Furthermore, the efficiency of zeolite used as adsorbents and photocatalyst in the photocatalytic application also presented.

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Maroo, Shalabh C., Tom Humplik, Tahar Laoui, and Evelyn N. Wang. "Water Infiltration in ZSM-5 Zeolites: Effect of Pore Volume and Water Structure." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75322.

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This study investigates the infiltration of water in ZSM-5 zeolite crystals via molecular dynamics simulations and experiments. A zeolite nano-crystal is constructed in the simulations and is surrounded by water molecules which enter and saturate the pores. The average number of water molecules per unit cell of the zeolite is determined along with the radial distribution function of water inside the zeolites. A geometric approximation of the zeolite pores and intersections is proposed and verified. Partial charge on the zeolite atoms is found to be a crucial parameter which governs the water infiltration behavior. ZSM-5 zeolite crystals were also synthesized and water infiltration experiments were conducted using an Instron. The simulation and experimental findings are compared and discussed. The understanding gained from these studies will be important for the development of zeolite based reverse osmosis membranes for water desalination.

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Chan, K. C., Christopher Y. H. Chao, G. N. Sze-To, and K. S. Hui. "Development of New Zeolite 13X/CaCl2 Composite Adsorbent for Air-Conditioning Application." In ASME 2011 5th International Conference on Energy Sustainability. ASMEDC, 2011. http://dx.doi.org/10.1115/es2011-54052.

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Composite adsorbents synthesized from zeolite 13X and CaCl2 were investigated for applications in solar adsorption systems. The effect of Ca-ion-exchange on the adsorption properties of zeolite 13X was studied. Sodium ions in the zeolite structure were replaced by calcium ions by ion exchange. It was found that the Ca-ion-exchange process decreased the specific surface areas of the Ca-ion-exchanged zeolites while the total pore volumes were increased. The optimized Ca-ion-exchange condition existed when soaking zeolite 13X in 46wt% CaCl2 solution for 36 hours. The increase in the total pore volume is good for further impregnating the zeolite with CaCl2. A large difference in equilibrium water uptake, 0.404g/g, between 25°C and 100°C under 870Pa was recorded for the 13X/CaCl2 composite adsorbent impregnated in 40wt% CaCl2 solution. This was 295% of that of zeolite 13X under the same condition. The 13X/CaCl2 composite adsorbent showed a high potential in replacing vapor compression chillers in producing chilled water for central air-conditioning systems.

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Dvorkin, Leonid I., Vadim Zhitkovsky, Nataliya Lushnikova, and Mohammed Sonebi. "Comparative Study of Metakaolin and Zeolite Tuff Influence on Properties of High-Strength Concrete." In 4th International Conference on Bio-Based Building Materials. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/www.scientific.net/cta.1.179.

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Composite admixtures which include active pozzolanic components and high-range water reducers, allows to obtain high-strength, particularly dense and durable concrete to achieve a reduction in resources and energy consumption of manufacturing.Zeolite, containing a significant amount of active silica, can serve as one of the alternative substances to resources and energy consuming mineral admixtures like metakaolin and silica fume. The deposits of zeolites are developed in Transcarpathia (Ukraine), USA, Japan, New Zealand, Iceland and other countries. It is known that zeolite tuffs exhibit pozzolanic properties and are capable to substitution reactions with calcium hydroxide.However, the high dispersion of zeolite rocks leads to a significant increase in the water consumption of concrete. Simultaneous introduction of zeolite tuffs with superplasticizers, which significantly reduce the water content, creates the preconditions for their effective use in high-strength concrete.Along with dehydrated (calcined) zeolite, natural (non-calcined) zeolite expresses itself as an effective mineral admixture of concrete. When using non-calcined zeolite, the effect of increasing in compressive strength at the age of 3 and 7 days is close to the effect obtained when using dehydrated zeolite: 8-10% and 10- 12%, respectively, and 28 days the strength growth is 13-22%. The use of non-calcined zeolite has a significant economic feasibility, so it certainly deserves attention. There were compared the effect of zeolite to metakaolinThe results of the research indicate that the use of composite admixtures, consisted of calcined (non-calcined) zeolite tuff of high dispersity and superplasticizer of naphthalene formaldehyde type, allows to obtain concretes classes C50…C65.

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Humplik, Thomas, Tahar Laoui, and Evelyn N. Wang. "Transport Across Sub-Nanometer Zeolite Pores for Water Desalination." In ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30836.

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The molecular sieving capability of zeolites, alumino-silicate minerals with 3–8 Å diameter pores, promises an efficient method to remove salt from seawater. In this work, we synthesized and characterized MFI zeolites with a nominal pore diameter of 5.6 Å with varying Si/Al ratio from 23 to infinity to alter the wetting properties. We subsequently performed pressure infiltration tests with the synthesized zeolites suspended in water to investigate the effect of wetting properties on water transport in the pores. Water sorption isotherms were obtained that show distinct infiltration stages of water transport. For MFI zeolites, pressures of over 100 MPa were needed to fill the pore volume. The insight gained from this work is a first step towards designing zeolite-based membranes for the active layer of a reverse osmosis membranes. This work will be further developed in future work to understand ion transport through zeolites.

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Hudiono, Yeny, Adam Christensen, Woentae Oh, Samuel Graham, and Sankar Nair. "Synthesis of Polycrystalline Zeolite Films and Thermal Conductivity Measurements by a 3-Omega Method." In ASME 2004 3rd Integrated Nanosystems Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/nano2004-46092.

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Zeolites (nanoporous crystalline aluminosilicates) have important applications in catalysis and separations [1,2], and are also being considered for adsorption-based heating and cooling systems [3]. We are investigating the use of zeolite films in the fabrication of more efficient adsorption heat pumping and refrigeration systems that use water vapor as the working fluid. The thermal conductivity of the adsorbent is an important property affecting heat transfer in an adsorption heat pumping system. There are few reports (e.g. [4]) of the thermal conductivity of zeolites, which is measured by compacting the zeolite powder into a disk sample and using a model to extract the ‘intrinsic’ thermal properties. Another approach [5] relies on molecular dynamics simulation using parameterized force fields to predict the intrinsic thermal conductivity.

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Reports on the topic "Zeolite"

Tsapatsis, Michael, Prodromos Daoutidis, Bahman Elyassi, Fernando Lima, Aparna Iyer, Kumar Agrawal, and Sanket Sabnis. Hydrogen Selective Exfoliated Zeolite Membranes. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178537.

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Reimann, G. A. Reclaiming silver from silver zeolite. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/6976372.

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Richard D. Noble and John L. Falconer. CO2 SEPARATIONS USING ZEOLITE MEMBRANES. Office of Scientific and Technical Information (OSTI), June 2001. http://dx.doi.org/10.2172/830703.

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Reimann, G. A. Reclaiming silver from silver zeolite. Office of Scientific and Technical Information (OSTI), October 1991. http://dx.doi.org/10.2172/10116957.

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Corbin, D. R., M. M. Eddy, L. Abrams, G. A. Jones, and G. D. Stucky. Flexibility of the Zeolite RHO Framework. Neutron Powder Structural Characterization of Ca-Exchanged Zeolite RHO. Fort Belvoir, VA: Defense Technical Information Center, July 1988. http://dx.doi.org/10.21236/ada197195.

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Sachtler, Wolfgang M. H. Chemical Interactions in Multimetal/Zeolite Catalysts. Office of Scientific and Technical Information (OSTI), April 2004. http://dx.doi.org/10.2172/899300.

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Sachtler, W. M. H. Chemical interactions in multimetal/zeolite catalysts. Office of Scientific and Technical Information (OSTI), November 1991. http://dx.doi.org/10.2172/5977368.

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Sachtler, W. M. H. Chemical interactions in multimetal/zeolite catalysts. Office of Scientific and Technical Information (OSTI), December 1992. http://dx.doi.org/10.2172/6905684.

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Hsu, R. H. Pf/Zeolite Catalyst for Tritium Stripping. Office of Scientific and Technical Information (OSTI), March 2001. http://dx.doi.org/10.2172/780502.

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Sachtler, W. M. H. Chemical interactions in multimetal/zeolite catalysts. Office of Scientific and Technical Information (OSTI), February 1992. http://dx.doi.org/10.2172/5830229.

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