Gotowe bibliografie tematyczne / Synthetic Zeolites

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Gotowa bibliografia na temat „Synthetic Zeolites”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Synthetic Zeolites"

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Sugiarti, Sri, Charlena Charlena i Nurul Afiati Aflakhah. "Zeolit Sintetis Terfungsionalisasi 3-(Trimetoksisilil)-1-Propantiol sebagai Adsorben Kation Cu(II) dan Biru Metilena". Jurnal Kimia VALENSI 3, nr 1 (31.05.2017): 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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Solihat, Imas, Lilis Sulistiawaty, Putri Hawa Syaifie i Agus Taufiq. "Removal of Cu Metals from Wastewater by Adsorption using Synthetic Zeolites from Rice Husk and Corncob". Molekul 15, nr 2 (27.07.2020): 105. http://dx.doi.org/10.20884/1.jm.2020.15.2.589.

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Heavy metals, such as Cu, are hazardous components so that it needs to reduce their concentration due to their negative impact on the environment. One method that can be used to reduce heavy metals in waste is to use adsorbents (synthetic zeolites). Utilization of agricultural waste such as rice husks and corncobs as precursors of synthetic zeolites will add economic value because it is relatively cheap with a lot of availability. This research aimed to find out new variants of synthetic zeolites, which can reduce the concentration of Cu in the adsorption process. The study consisted of 3 stages, the first stage was zeolite synthesis by the sol-gel method with 3 zeolite variants (A, B and C), the second stage was characterization using XRD and SEM, and the third stage was zeolites optimization (variations in pH, weight, and concentration). According to the results of SEM, zeolite B had a larger and uniform pore size so as it produced a greater adsorption capacity (4.82 mg/g) to be compared with zeolites A and C. The results showed synthetic zeolite C was able to adsorb Cu waste by following the adsorption isotherm model of Langmuir
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Flores Díaz, Alicia Amairani, Martha Alicia Velázquez Machuca, Adriana Medina Ramírez, José Luis Montañez Soto, José Venegas González i José Luis Pimentel Equihua. "Boron adsorption on modified zeolites: Effect of modifier and source of water". Revista Internacional de Contaminación Ambiental 39 (2.06.2023): 139–57. http://dx.doi.org/10.20937/rica.54473.

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The removal of boron from drinking water is a concern in various parts of the world due to the toxic effects of this metalloid in high concentrations. In this paper, zeolites LTL and FAU X were synthesized and modified with salts of nickel (NiCl2), iron (FeCl3), and aminopropyltriethoxysilane (APS) in order to promote their affinity for boron species present in aqueous systems. The adsorption capacity of modified zeolites for boron was evaluated in a synthetic boron solution and with groundwater samples for human use. The effect of the pH and zeolite dose was studied in adsorption tests using groundwater. The modified zeolites were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nitrogen physisorption, and Fourier-transform infrared spectroscopy. Results indicated that the modification of zeolites favors affinity for boron species. The highest adsorption capacity of boron on zeolites was achieved in the synthetic solution. The adsorption capacity of the modified zeolites depended on the pH, the electrical conductivity, the modifying agent, the zeolitic structure, and the dose of adsorbent. The zeolitic structure-modifying agent interaction was decisive for boron adsorption capacity, with LTL-Ni zeolite being the best-performing adsorbent, thanks to its textural properties and nickel’s ability to form complexes with boron species.
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Patrylak, Lyubov, Serhii Konovalov, Stepan Zubenko i Anzhela Yakovenko. "Transformation of Hexoses on Natural and Synthetic Zeolites". Chemistry & Chemical Technology 17, nr 2 (1.06.2023): 287–93. http://dx.doi.org/10.23939/chcht17.02.287.

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A number of zeolite catalysts based on synthetic powder zeolites and natural Ukrainian clinoptilolite as well as mordenite-clinoptilolite zeolite rocks were synthesized. The activity and selectivity of the prepared samples were compared in glucose and fructose dehydration into 5-hydroxymethylfurfural in a dimethyl sulfoxide environment.
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Azizi, Seyed Naser, Akram Alavi Daghigh i Maryam Abrishamkar. "Phase Transformation of Zeolite P to Y and Analcime Zeolites due to Changing the Time and Temperature". Journal of Spectroscopy 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/428216.

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In the present study, the synthesis of template free zeolite P under hydrothermal condition was investigated. The effects of parameters such as Si/Al ratios (3–45), crystallization temperatures (80–160°C), and cry (40–60 h) on the synthesis of zeolite P were studied. The phase transformation of zeolite P to two types of high crystallinity Y and analcime zeolites due to change of temperature was observed. The effect of temperature on the achievement of two different zeolite types (Y and analcime) with a constant initial synthetic composition under organic free synthesis of zeolite P was studied. The zeolitic products were characterized by X-ray diffraction, scanning electron microscopy, and IR spectroscopy techniques.
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Woszuk, Agnieszka. "Application of Fly Ash Derived Zeolites in Warm-Mix Asphalt Technology". Materials 11, nr 9 (27.08.2018): 1542. http://dx.doi.org/10.3390/ma11091542.

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In recent years, numerous studies have been carried out on new technologies allowing to reduce of mix asphalt production temperatures. One of the possibilities is to foam the asphalt with “water-containing” additives, which include zeolites. So far, mainly synthetic zeolites of the Linde A structure type, obtained from chemical reagents, and natural clinoptilolite have been used in WMA technology. In this studies, the synthetic zeolites produced from fly ashes with 4 different types of crystalline structure were analyzed. Zeolite materials were characterized by textural parameters and thermal analysis. The amount of zeolite added to asphalt was 0, 3, 5, 7 wt % in relation to the weight of asphalt. Determination of dynamic viscosity was performed at two temperatures: 135 and 160 and 4 time intervals. The tests were performed for two asphalt binders: 35/50 and 100/150 penetration grade. As a conclusion, it was found that the viscosity of asphalt pastes with zeolitic materials increases with the increase in the amount of zeolite added. The increase level depends mainly on the textural parameters. The potential usefulness of fly ash derived zeolites in the process of asphalt foaming, which depends mainly on the amount of water contained in the zeolite structure and the method of its release, has been proved.
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PANDOVA, IVETA, i MIROSLAV RIMAR. "REDUCTION OF METAL CATIONS CONTENT FROM THE AQUEOUS SOLUTIONS BY SORBENTS". MM Science Journal 2021, nr 6 (15.12.2021): 5307–11. http://dx.doi.org/10.17973/mmsj.2021_12_2021044.

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The article presents the results of research on reducing the concentration of heavy metals, such as copper and nickel, on natural zeolite in comparison with synthetic zeolite and chemically treated natural zeolite. The reduction of the content of specific types of heavy metals from aqueous solutions was investigated by the method of sorption kinetics. The results indicate the ability of natural zeolites to compete with synthetic zeolites.
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Ovchinnikov, Grygoriy A., Valentina А. Gorskikh, Ilyana I. Fassalovа, Vadim S. Тukhvatshin i Rifkat F. Talipov. "KINETICS OF ADSORPTION OF 4,4-DIMETHYL-1,3-DIOXANE FROM AQUEOUS SOLUTIONS BY SYNTHETIC ZEOLITES IN PRESENCE OF PHOSPHORIC ACID". IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 61, nr 12 (12.12.2018): 81–86. http://dx.doi.org/10.6060/ivkkt.20186112.5542.

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In this paper we studied the kinetics of adsorption of 4,4-dimethyl-1,3-dioxane by synthetic zeolites from aqueous solutions in the presence of phosphoric acid. Kinetic mechanism of DMD adsorption from aqueous solutions by synthetic zeolites were considered from the position of three kinetic models: the diffusion model (Boyd and Morris-Weber model), Lagergeren (pseudo-first order), and pseudo-second order. As sorbents we have used synthetic zeolites KA, NaA, CaA, CaX, NaX with a pore diameter of 3-9 Å. DMD (boiling point is 113-114 ºC) was synthesized from isobutylene. Chromatographic analysis was performed on Chromatec Crystal 5000.1 instrument (Russia) using columns (2.0 m in length) with silicone SE-30 (5%) stationary phase (0.16–0.20 mm, operating temperature is 50–220 °C) with nitrogen as a carrier gas. An adsorption of DMD from aqueous solutions was investigated at (75±1) °C from a limited volume under constant mixing (laboratory mechanical stirrer, 17 rps). The contact time of the solution with samples of sorbents varied from 120 to 3600 s. The DMD concentration in solution was determined by the chromatographic method (the internal standard is 4,4,5-trimethyl-1,3-dioxane). The values of the external and internal mass transfer diffusion coefficients were obtained. The effect of the size of zeolite’s pores on the contribution of the external or internal diffusion mass transfer in the process of adsorption of 4,4-dimethyl-1,3-dioxane was founded. The time of establishment of sorption equilibrium was determined. We have found that the process of adsorption of DMD by synthetic zeolites in the presence of phosphoric acid is determined by the values of the diameter of the pores. It is shown that the value of pore diameter of synthetic zeolites does not influence on the аdsorption equilibrium time of DMD. The adsorption equilibrium time for all used family zeolites is 900 s. The kinetics of adsorption of DMD on synthetic zeolites can be correctly described by a pseudo-second-order equation, which indicates the presence of sorbate (DMD) interaction with the sorbent (synthetic zeolite).
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Septiansyah, Sy Indra, i Maya Santi. "Pemanfaatan Alumina Waste dari Tailing Bauksit Menjadi Zeolit Adsorben". EKSPLORIUM 39, nr 2 (31.01.2019): 123. http://dx.doi.org/10.17146/eksplorium.2018.39.2.4982.

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ABSTRAK Alumina waste dari tailing bauksit merupakan produk samping yang berasal dari hasil benefisiasi bijih bauksit. Proses benefisiasi dilakukan dengan cara memisahkan partikel-partikel yang ada seperti lumpur atau clay, akar-akar, butiran bijih bauksit berkisar 2 mm yang dibuang atau menjadi waste product atau disebut sebagai limbah tailing. Tingginya kadar alumina dan silika dalam tailing bauksit menjadi salah satu alasan mengapa tailingini dapat dimanfaatkan sebagai bahan dasar dalam pembuatan produk baru yaitu zeolit sintetis. Zeolit sintetis dipilih karena zeolit merupakan produk impor, harganya mahal dan memiliki sifat yang seragam serta >150 jenis zeolit sintetis dapat dibuat secara komersial dan bahkan di industri zeolit dapat dimanfaatkan secara luas sebagai adsorben, penukar ion, membrane, katalis, dan lain-lain.Hasil analisis kimia tailing bauksit menunjukkan komposisi: alumina (Al2O3) sekitar 49,41%, silika (SiO2) sekitar 12,58%, hematit (Fe2O3) sekitar 10,6% dan beberapa oksida anorganik lainnya dalam jumlah yang kecil. Proses konversi tailing bauksit menjadi zeolit adsorben dilakukan dengan metode fusi kaustik untuk mendapatkan ekstrak fusi (mother liquor) kemudian dilanjutkan dengan penambahan prekursor natrium silikat dengan formula sintesis Si/Al(1:1). Kristalisasi produk dilakukan dengan menggunakan metode hidrotermal pada suhu rendah dengan variable waktu inkubasi yang ditentukan. Reaksi sodium aluminat dan sodium silikat telah mentransformasi fasa amorf gel menjadi fasa kristalin zeolit yang berbentuk serbuk putih halus.ABSTRACTA lumina waste from bauxite tailings is the by products derived from bauxite ore beneficiation. The beneficiation process is done by separating the particles that exist such as mud or clay, roots, grain, bauxite ore ranges from 2 mm are discarded or be referred to as a waste product or tailings. High concentration of alumina and silica in bauxite tailings considered as one of the reasons why these tailings can be used as base material in the making new products, namely synthetic zeolites. Zeolites synthetic is selected because zeolites are imported, expensive and have uniform properties and >150 types of synthetic zeolites can be made commercially and even in industrial zeolite can be used widely as an adsorbent, ion exchange, membranes, catalysts, etc. The chemical analysis of bauxite tailings showed the composition of alumina (Al2O3) is approximately 49.41% silica (SiO2) is about 12.58%, hematite (Fe2O3) is approximately 10.6% and some other inorganic oxides are small amounts. The conversion process bauxite tailings into zeolite is carried out by caustic fusion method to extract the fusion (alumina precursor) followed by the addition of sodium silicate precursor with synthesis formula 1.2Na2O.0.5SiO2.0.5Al2O3.10H2O and crystallization products is carried out by the hydrothermal method at low temperatures with variable incubation period specified. The results showed that the zeolite synthesis of bauxite tailings using caustic fusion and followed by crystallization at low temperature and under atmospheric pressure has succeeded in transforming the product into an amorphous phase to the crystalline phase product zeolite adsorbent.
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Łach, Michał, Agnieszka Grela, Tomasz Bajda, Dariusz Mierzwiński, Norbert Komar i Janusz Mikuła. "Production of Zeolite Sorbents from Burning and Co-burning Biomass with Coal". E3S Web of Conferences 44 (2018): 00097. http://dx.doi.org/10.1051/e3sconf/20184400097.

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The limited resources of natural zeolites make it necessary to search for and use synthetic products. This paper presents a method of producing zeolite sorbents resulting from hydrothermal synthesis in an autoclave. The raw materials used in the syntheses were fluidized-bed fly ashes derived from the burning of forest biomass and sunflower hulls and two fly ashes derived from biomass combustion. The raw materials and zeolite sorbents were characterised using the analysis methods of phase composition and textural properties of the samples. The sorptive capacity of the raw materials and zeolite sorbents was determined by means of cation and anion exchange capacity. The analyses and research have shown that as a result of the synthesis process it is possible to obtain the following zeolite phases: sodalite, faujasite, chabazite. The determined value of the cation and anion exchange capacity for synthetic zeolite sorbents are greater than those which characterise natural zeolites.
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Rozprawy doktorskie na temat "Synthetic Zeolites"

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Amin, S. "Surface barriers on synthetic zeolites". Thesis, University of Salford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291648.

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Sulaiman, Shamsul Kamal. "Preparation of synthetic zeolites from aluminosilicate materials". Thesis, University of Leeds, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.427789.

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Williams, C. D. "Use of synthetic zeolites as slow release agents". Thesis, University of Salford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381713.

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Brace, Shelley. "Synthetic and structural studies of high silica MFI zeolites". Thesis, Keele University, 2017. http://eprints.keele.ac.uk/3778/.

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A systematic series of high-silica fluoride MFI zeolites were efficiently synthesised using a variety of shape and size structure directing agents. The effects of these structure directing agents on the zeolite synthesised have been studied by the complementary use of X-ray diffraction and solid state NMR. These 14N, 13C and 29Si NMR experiments yield information about the orientation of the structure directing agent within zeolite pores. They also identify covalently bonded fluoride in the form of pentacoordinated silicon whereby the first case of static and dynamic ordering of fluoride in the same zeolite is discovered by changing the structure directing agent. A two-dimensional solid state NMR experiment has also been used to study 13C isotopically labelled silicalite-1 synthesised using n-methyltributylammonium iodide. The double cross polarisation (DCP) experiment allows the distance to be determined between the structure directing agent and silicon framework for the first time in a zeolite system using NMR. This experiment has the potential to be replicated for silicalite-1 zeolites synthesised using alternate structure directing agents or for other zeolites systems.
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Kini, Gautam Chandrakanth. "Characterization of synthetic zeolites optimized for heavy metal uptake from wastewater". [Gainesville, Fla.] : University of Florida, 2006. http://purl.fcla.edu/fcla/etd/UFE0015769.

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Holmes, Amy Elizabeth. "Synthetic and atomic force microscopy studies of offretite/erionite family zeolites". Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/synthetic-and-atomic-force-microscopy-studies-of-offretiteerionite-family-zeolites(476728ac-6294-44e9-9ac7-b2abcef04b0b).html.

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Several members of the ABC-6 zeolite family, namely offretite, zeolite T, ZSM-34 and zeolite L, were synthesised with a view to studying the effect of synthetic parameters on the resulting crystal properties. A range of procedures for producing offretite and ZSM-34 were tested, and crystals with the optimal morphology, purity, crystallinity and size identified. A standard procedure for synthesising zeolite T was used, before the effect of systematically altering the cation concentration, Si/Al ratio and water content in the synthesis mixture was studied, and the optimal composition identified. Ex-situ AFM was used to study the morphology of the resulting crystals, as well as to determine information about surface features, such as the shape and height of terraces. This information could be used to infer the growth mechanism for each crystal. The AFM studies of zeolite L were compared with those of previous studies and found to agree. For offretite, zeolite T and ZSM-34, 1.2 nm high terraces elongated along the length of the {100} face of the crystals were observed. Where the crystals exhibited a micro-crystalline morphology without distinct faces HR-SEM was used to study their morphology and terracing. In-situ AFM was used to study the dissolution of the crystals in basic media. In each case the terraces were observed to dissolve primarily length-wise. The dissolution of terraces on zeolite T was considered in particular detail. The terrace height was measured during dissolution, and three distinct measurements were observed, 1.2, 0.8 and 0.2 nm. These heights were related to framework features. Lateral force AFM measurements were used to show the relationship between decreased terrace height and increased lateral deflection, indicating that dissolving areas of crystal exhibited increased tip-sample friction. The rate of dissolution of terraces on zeolite T was also considered. It was found that dissolution rate increased with increasing NaOH concentration, and with increasing tip-sample force in the AFM. These observations allowed order of reaction for the dissolution process of zeolite T to be estimated at 2.54. A magnesium substituted aluminophosphate ABC-6 family zeotype material, MgAPO-CJ60, was also synthesised and analysed. Solid-state NMR was used to determine the distribution of aluminium and phosphorous within the framework, which was found to be non-random.
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Hui, Kwan San. "Recycling of coal fly ash : synthetic zeolite 4A and MCM-41 /". View abstract or full-text, 2004. http://library.ust.hk/cgi/db/thesis.pl?MECH%202004%20HUI.

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Tian, Yuyang. "Synthesis and characterization of crystalline microporous materials : investigation of new synthetic routes". Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/6371.

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Conventionally, crystalline microporous materials such as zeolites and metal-organic frameworks (MOFs) are synthesized through the hydrothermal route or the trial-and-error approach. Other synthetic strategies may lead to the synthesis of microporous materials with new architectures or interesting properties. The general aim of this thesis is to investigate some new synthetic routes towards crystalline microporous materials. A top-down and post-synthesis method is reported in Chapter 4. Some zeolites are built up by layers and double-4-ring pillars. Germanium is preferentially located in the double-4-ring sites of a zeolite framework and is hydrolytically unstable. The idea of the top-down method is to disassemble these zeolites to the layer structures by dissolving the Ge-containing pillars and reassemble them to a new framework. This method is applied to the germanosilicate IWW and ITH zeolites for the first time. The effects of framework chemical compositions, Ge distributions and disassembling conditions on the top-down treatment process are investigated. The products obtained from the top-down treatment are characterised. An ionic liquid assisted strategy for the synthesis of zeolites is described in Chapter 5. The ionic liquid assisted strategy is a solvent free reaction. The raw materials are transformed to zeolites through a solid state reaction. The ionic liquids are first used as structure-directing agents (SDAs) in this solvent free reaction to replace the expensive quaternary ammonium hydroxide. A TON zeolite is synthesized using 1-ethyl-3-methylimidazolium bromide as the SDA. Moreover, the ionic liquid assisted strategy is considered as a “green chemistry” synthetic route due to the high yield of the zeolites and the minor production of waste water. Many aluminophosphates have been successfully synthesized through ionothermal routes. Most of them are synthesized using 1-alkyl-3-methylimidazolium based ionic liquids. A new ionic liquid, 1-(2-hydroxyl-ethyl)-3-methylimidazolium chloride ([HOEmim]Cl), is prepared and used for the ionothermal synthesis of aluminophosphate materials. A zeolite analogue with the CHA framework has been synthesized. At high synthetic temperatures, the products are large single crystals. The structures of the framework and the SDA are investigated by single crystal diffraction and other characterisation methods. Flexible MOF materials are usually synthesized by a trial-and-error approach. Recently a flexible MOF compound was synthesized using 5-sulfoisophthalic acid (SIP) as the ligand. It was proposed the sulfonate is weakly coordinated to the metal, which brings flexibility to the compound, and the carboxylate groups keep the framework intact. 2-sulfoterephthalic acid (STP) which also contains one sulfonate group and two carboxylate groups is believed to be an alternative ligand for the targeted synthesis of flexible MOFs. In Chapter 7, a MOF compound is synthesized using STP and 4, 4'-bipyridine (Bpy) as ligands to validate the proposed strategy can be generalized. Variable temperature single crystal diffraction analysis solves the structure and reveals a reversible structure transformation upon dehydration and rehydration.
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Rebedea, Irina. "An investigation into the use of synthetic zeolites for in situ land reclamation". Thesis, Liverpool John Moores University, 1997. http://researchonline.ljmu.ac.uk/5562/.

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This thesis describes an experimental study to determine the feasibility of using zeolite addition for the in situ treatment of soils contaminated with heavy metals. The aim of the present work was to examine the effectiveness of three synthetic zeolites to reduce plant available metal pools in contaminated soils. Three contaminated soils were studied, which are representative of typical contamination sites in the UK: Prescot, site of a copper refmery, Trelogan, an old lead/zinc mine spoil, and Gateacre, a sewage sludge treated field. The action of zeolites to reduce available metal concentrations in soils is due to their ion-exchange properties. To investigate the decrease of metal bioavailability by zeolites, laboratory and greenhouse trials were performed to clarify the mechanism of heavy metal fixation by synthetic zeolites and to quantify the effect of different zeolites for land remediation. For this approach, it was necessary to measure the metal concentration in the soil and the soil solution in zeolite-amended soils and to determine the zeolite specific isotherms of all the metals studied. Cation exchange studies involved exchanging the sodium form of the zeolites with different metals in solution, in order to determine the zeolite affinity for the metals copper, cadmium, zinc and lead. The resulting isotherms demonstrated that all three zeolites showed a preference for the heavy metal ions over sodium ions. The changes in metal speciation in zeolite-treated contaminated soils were evaluated using sequential extraction procedures. After incubation with synthetic zeolites, metals extracted with ammonium acetate were significantly decreased (31.4 % - 72.4 %) in amended soils compared to the controls. This decrease in heavy metal availability is extremely significant. The exchangeable metal fraction is the most available for uptake by plants. Long term soil solution experiments with zeolite-amended soils showed that the metal concentrations in the aqueous leachate were significantly reduced than in the leachate from the same substrates without zeolite addition. Greenhouse pot trials were carried out with sunflower (Helianthus annuus), maize (Zea mays), willows (Salix viminalis) and ryegrass (Lolium perenne) plants grown in zeolite amended contaminated soils. There were significant improvements in visual appearance and growth of plants from the zeolite-treated soils compared to the controls. In addition, metal content of plant tissues was reduced when compared to the controls. Optimum zeolite concentrations were noted for each zeolite. Zeolite P and 4A were more effective at reducing the phytotoxicity at 0.5% and 1%, whilst zeolite Y had to be added at 5% to achieve a similar effect. In order to link the laboratory test results and soil data to a pilot field scale, in which the actual soil and environmental conditions are required to give a complete evaluation of the proposal technique when applied to a given hazardous waste site, a field trial was initiated, at a copper contaminated site at B.I.C.C., Prescot to examine the effectiveness of zeolite amendments under field conditions. Zeolites P and 4A applied at 1% level proved to be an effective treatment for the remediation of the contaminated site, as indicated by improved plant growth and low metal concentrations in the water soluble fraction of the soil. The results show that zeolite addition, particularly zeolites P and 4A, provide an effective method for decreasing plant heavy metal bioavailability in polluted soils, under glasshouse and field conditions.
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Whitehead, Kate. "The application of synthetic zeolites for the removal of heavy metals from contaminated effluents". Thesis, University of Surrey, 2000. http://epubs.surrey.ac.uk/771884/.

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The aim of this research was to provide a comprehensive evaluation of the heavy metal removal performance of two synthetic zeolites, Zeocros CA150 and Zeocros CG180. Detailed laboratory investigations of the key parameters known to affect zeolitic ion exchange were performed with respect to lead, zinc, copper, cadmium and nickel by means of batch equilibrium tests. The study into the effect of contact time suggests that a near equilibrium state was reached within two hours. As metal hydroxide precipitation was minimal at pH 6.0 and the structural integrity of the zeolite was maintained, metal removal at this pH is predominantly by ion exchange rather than chemical precipitation. Fluctuations in both silicon and aluminium release from the zeolites suggest that partial dissolution may occur under mildly acidic conditions, an observation discussed elsewhere in the literature. Heavy metal removal decreased with increasing metal loading, with the zeolites exhibiting Significantly lower operating exchange capacities compared to the theoretical ones. Exchange capacities varied between 1.3-4.9 meq/g and 0.5-4.6 meq/g for CA 150 and CG180 respectively for the five metals studied. Throughout all of the experimental investigations, lead was removed preferentially (>99%) and nickel removal effiCiencies were the lowest «20%). The results from the mixed metal studies demonstrated that lead removal was the least affected by the presence of other heavy metals whereas cadmium, copper and zinc removal was suppressed in comparison to that from Single metal solutions. The presence of competing ions was not found to adversely affect lead removal by CA 150 and CG180, with copper and cadmium removal showing the most suppression in the presence of calcium, magnesium, potassium and sodium. Zinc uptake by both zeolites proved the most sensitive to the addition of hardness ions even under soft water conditions. The zeolites were also demonstrated to achieve up to 100% removal from real effluents, outperforming a natural zeolite, clinoptilolite. Overall, this research has demonstrated the considerable potential of these synthetic zeolites to selectively remove heavy metals from complex contaminated effluents, indicating their possible application as a tertiary technology for effluent treatment.
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Książki na temat "Synthetic Zeolites"

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Zhdanov, S. P. Synthetic zeolites. New York: Gordon and Breach Science Publishers, 1990.

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Zhdanov, S. P. Synthetic zeolites. New York: Gordon and Breach Science Publishers, 1990.

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Zhdanov, S. P. Synthetic zeolites. New York: Gordon and Breach Science Publishers, 1990.

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Clifton, Robert A. Natural and synthetic zeolites. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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Clifton, Robert A. Natural and synthetic zeolites. Washington, DC: U.S. Dept. of the Interior, 1987.

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Amin, S. Surface barriers on synthetic zeolites. Salford: University of Salford, 1991.

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Williams, C. D. Use of synthetic zeolites as slow release agents. Salford: University of Salford, 1987.

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Blay, Vincent, Luis Francisco Bobadilla i Alejandro Cabrera, red. Zeolites and Metal-Organic Frameworks. NL Amsterdam: Amsterdam University Press, 2018. http://dx.doi.org/10.5117/9789462985568.

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Zeolites are natural or synthetic materials with porous chemical structures that are valuable due to their absorptive and catalytic qualities. Metal-Organic Frameworks (MOFs) are manmade organometallic polymers with similar porous structures. This introductory book, with contributions from top-class researchers from all around the world, examines these materials and explains the different synthetic routes available to prepare zeolites and MOFs. The book also highlights how the substances are similar yet different and how they are used by science and industry in situations ranging from fueling cars to producing drugs.
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Singh, I. J., of Process Development Division. i Bhabha Atomic Research Centre, red. Treatment options of low level liquid waste of ETP origin by synthetic zeolites. Mumbai: Bhabha Atomic Research Centre, 2001.

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Williams, Craig Denver. Uptake and release studies of simple organic molecules in synthetic zeolites. Salford: University of Salford, 1985.

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Części książek na temat "Synthetic Zeolites"

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Chen, Cong-Yan, i Stacey I. Zones. "Post-Synthetic Treatment and Modification of Zeolites". W Zeolites and Catalysis, 155–70. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630295.ch6.

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Thomas, John M., i Charis R. Theocharis. "Clays, Zeolites and Other Microporous Solids for Organic Synthesis". W Modern Synthetic Methods, 249–304. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-83758-6_4.

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Camblor, Miguel A., i Suk Bong Hong. "Synthetic Silicate Zeolites: Diverse Materials Accessible through Geoinspiration". W Porous Materials, 265–325. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9780470711385.ch5.

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Boycheva, Silviya, Denitza Zgureva, Borislav Barbov i Yuri Kalvachev. "Synthetic Micro- and Nanocrystalline Zeolites for Environmental Protection Systems". W Nanoscience Advances in CBRN Agents Detection, Information and Energy Security, 443–50. Dordrecht: Springer Netherlands, 2014. http://dx.doi.org/10.1007/978-94-017-9697-2_45.

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Wdowin, Magdalena, Rafal Panek i Wojciech Franus. "SEM-EDS Observation of Structure Changes in Synthetic Zeolites Modified for CO2 Capture Needs". W Springer Proceedings in Physics, 97–103. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16919-4_13.

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Strohmaier, Karl G. "Synthesis Approaches". W Zeolites and Catalysis, 57–86. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630295.ch2.

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Chaves Lima, Rafael, Lindiane Bieseki, Paloma Vinaches Melguizo i Sibele Berenice Castellã Pergher. "Zeolite Synthesis: General Aspects". W Environmentally Friendly Zeolites, 21–63. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19970-8_2.

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Chaves Lima, Rafael, Lindiane Bieseki, Paloma Vinaches Melguizo i Sibele Berenice Castellã Pergher. "Zeolite Eco-friendly Synthesis". W Environmentally Friendly Zeolites, 65–91. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-19970-8_3.

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Park, Sang-Eon, i Nanzhe Jiang. "Morphological Synthesis of Zeolites". W Zeolites and Catalysis, 131–53. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2010. http://dx.doi.org/10.1002/9783527630295.ch5.

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Vuong, Gia-Thanh, i Trong-On Do. "Nanozeolites and Nanoporous Zeolitic Composites: Synthesis and Applications". W Mesoporous Zeolites, 79–114. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527673957.ch3.

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Streszczenia konferencji na temat "Synthetic Zeolites"

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Mimura, Hitoshi, Minoru Matsukura, Fumio Kurosaki, Tomoya Kitagawa, Akira Kirishima i Nobuaki Sato. "Multi-Nuclide Separation Using Different Types of Zeolites". W 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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Ikarashi, Yuki, Rana Syed Masud, Tomonori Nakai, Hitoshi Mimura, Eiji Ishizaki, Minoru Matsukura i Yoshinobu Hosoi. "Selective Adsorption Properties and Stable Solidification of Cs by Insoluble Ferrocyanide Loaded Zeolites". W 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-15452.

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In Fukushima NPP-1, large amounts of high-activity-level water (HALW) accumulated in the reactor, turbine building and the trench in the facility is treated by circulating injection cooling system. The development of highly functional adsorbents and stable solidification method contributes to the advancement of the decontamination system and environmental remediation. The present study deals with (1) preparation of insoluble ferrocyanide loaded zeolites, (2) selective uptake of Cs+ in seawater, (3) estimation of Cs immobilization ratio and stable solidification. Various kinds of Cs-selective composites loaded with insoluble ferrocyanides (CoFC, NiFC) into the zeolites (zeolite A (A51, A-51J), zeolite X (LSX), chabazite (modified chabazite) and natural mordenite (SA-5)) matrices have been prepared using successive impregnation/precipitation methods by Tohoku University. As for Cs+ adsorption, these composites had relatively large uptake (%) above 95%, distribution coefficients (Kd) above 103 cm3/g and excellent adsorption kinetics even in seawater. The immobilization ratio (%) of Cs for the CoFC saturated with Cs+ was estimated at different calcination temperatures up to 1,200°C in advance. The immobilization ratio was less than 0.1% above 1,000°C, indicating that the adsorbed Cs+ ions are completely volatilized and insoluble ferrocyanides had no immobilization ability for Cs. In contrast, the insoluble ferrocyanide-loaded zeolites had excellent Cs immobilization ability; in the case of insoluble ferrocyanide-loaded natural zeolites (NiFC-SA-5, CoFC-modified chabazite), the immobilization ratio was above 99% and 96% even after calcination at 1,000°C and 1,100°C, respectively, indicating that nearly all Cs ions are immobilized in the sintered solid form. On the other hand, the immobilization ratio for the insoluble ferrocyanide-loaded A and X zeolites (NiFC-A (A51, A51J), NiFC-X) tended to decrease with calcining temperature; for example, the immobilization ratio for NiFC-X at 1,000°C and 1,100°C was estimated to be 74.9% and 55.4%, respectively, and many spots concentrating Cs were observed on the surface. The difference in immobilization behavior between natural zeolites and synthetic ones is probably due to the phase transformation and surface morphology at higher temperature above 1,000°C. The stable solidification of insoluble ferrocyanides was thus accomplished by using the excellent Cs immobilization abilities of zeolite matrices (Cs trapping and self-sintering abilities).
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Sych, Oleksandr, Svyatoslav Vuchkan, Hanna Vasylyeva, Myroslav Karbovanets i Marianna Yevych. "THE USE OF NATURAL ZEOLITES OF TRANSCARPATHIA TO SOLVE ENVIRONMENTAL PROBLEMS". W 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s24.05.

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Purification of aqueous solutions from radionuclide contamination is an extremely problematic topic, which is the subject of many scientific papers. This scientific topic is very relevant to Ukraine. In particular, the synthetic adsorbents � activated carbon, zeolites, metal oxide-adsorbents TiO2, titanium or zirconium phosphates, ion exchange resins, etc., are often used for the removal of heavy metal cations Pb (II), Cd (II), Ba (II), Hg (II), Sr (II) as well as some anions Cl-, F- from the aquatic environment. A special place among adsorbents is occupied by ion exchange resins, which, as a rule, have an organic matrix, for example, styrene-vinylbenzene with functional groups fixed on it. Ion-exchange resins, along with titanium dioxide and activated carbon, are most widely used in industry to purify aqueous solutions from heavy metal cation and radionuclides. These numbered adsorbents are synthetic materials. However, some adsorbents were created by nature. Natural zeolite, deposits of which are in the Zakarpattya region of Ukraine, are among them. The use of natural zeolites of Transcarpathia can solve some environmental problems caused by 90Sr pollution in the aquatic environment. All chemical processes including adsorption occur in complicated mechanisms and are reversible. After some time, equilibrium has been introduced. These complex mechanisms can be divided into several simple stages, which can be described by a relatively simple mathematical equation. In this study, the adsorption of Sr2+ ions from aqueous solutions by natural zeolite was investigated. And four most common kinetic models were applied for analysis of the experimental adsorption data.
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Talukder, Arif, Sumon Hossain Rabby i Muhammad Ashraf Ali. "Removal of ammonia from drinking water using synthetic zeolites". W 6TH INTERNATIONAL CONFERENCE ON CIVIL ENGINEERING FOR SUSTAINABLE DEVELOPMENT (ICCESD 2022). AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0129830.

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Toma, Ionut-Ovidiu, Sergiu-Mihai Alexa-Stratulat, Petru Mihai, Ana-Maria Toma i Vasile-Mircea Venghiac. "INFLUENCE OF ELEVATED TEMPERATURE ON THE EARLY AGE PROPERTIES OF CEMENT MORTAR WITH ZEOLITE POWDER". W 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s26.55.

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Zeolites can either occur naturally, in volcanic rock formations, or can be synthesized in the laboratory. When ground to a fine powder, they can be successfully used as supplementary cementitious material because of their chemical composition consisting in large amounts of SiO2 and Al2O3 that react with Ca(OH)2 to produce C-S-H gels. The composition of synthetic zeolites can be tailored to suit the purpose of their use in cementbased mortar and concrete and they can be produced from a variety of sources and at much lower energy costs than Portland cement. The use of zeolites in cement-based construction materials has led to improved mechanical and durability properties. The paper presents the preliminary results on using zeolites as supplementary cementitious material in mortar and the influence of elevated temperatures on the early age mechanical properties. The main parameters of the research were the replacement percentage of Portland cement by zeolite powder (10% and 20%, by volume of cement) as well as different temperature values (100�C, 150�C and 200�C). Standard 40?40?160 mm mortar prisms were cast and cured in water for 14 days before being subjected to elevated temperatures in an oven for 4 hours then left to gradually cool until they reached the room temperature. A control mix consisting of rapid hardening Portland cement was also cast and served as reference in the experimental program. The obtained results are presented in terms of density of the mortar mix, flexural and compressive strength.
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Onija, Oana, Silvia Neamţu, Andrada Măicăneanu i Lelia Ciontea. "Investigation of adsorption/release process of promethazine hydrochloride on synthetic zeolites". W PROCESSES IN ISOTOPES AND MOLECULES (PIM 2013). AIP, 2013. http://dx.doi.org/10.1063/1.4833713.

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Toma, Ionut-Ovidiu, Ioana Olteanu, George Taranu, Oana-Mihaela Banu i Sergiu-Mihai Alexa-Stratulat. "EARLY AGE MECHANICAL PROPERTIES OF CEMENT BASED MORTAR WITH ZEOLITE AGGREGATES". W 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022v/6.2/s26.52.

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As natural resources are rapidly depleting and the demand of cement based products in construction industry is continuously increasing, there is a pressing need for finding alternatives without large penalties in terms of mechanical properties. Another issue to be resolved is related to current design guidelines developed for traditional cement based materials (e.g. mortar and concrete). Zeolites, either natural or synthetic, are crystalline alumina silicates with pozzolanic activity in cement based materials that lead to obtaining mortars and concrete with improved elastic, mechanical and durability properties. They represent a viable alternative to river or quarry aggregates. The paper focuses on assessing the early age mechanical properties of cement based mortar with natural zeolites aggregates that were used to replace river sand in different percentages: 10, 20 and 30 percent by mass. A mortar mix, without zeolite aggregates, was also considered and served as reference. Standard 40?40?160 mm mortar prisms were cast and then cured in water for 14 days. The samples were measured and weighed in order to determine the density of the mortar mixes. The damping material properties were determined based on ASTM C215 code. Flexural and compressive strength were determined in accordance to SR EN 196-1 specifications.
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Frontera, P., S. Marchese, F. Crea, R. Aiello i J. B. Nagy. "The strength effects of synthetic zeolites on properties of high performance concrete". W HIGH PERFORMANCE STRUCTURES AND MATERIALS 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/hpsm06044.

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Phuong, Nguyen Thi Truc, Cu Hoang Minh, Hung Hoa Lam, Ngo Tran Hoang Duong i Long Quang Nguyen. "An Ultrafast and Green Synthesis of Mesoporous Zeolite X for Great Enhancement in Methylene Blue Adsorption". W 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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Almirón, Jonathan, Angel Valencia Huaman, Sandro Fuentes Mamani i Luis Mamani De La Cruz. "A review of the interaction of natural and synthetic zeolites in the pyrolysis of plastics". W 20th LACCEI International Multi-Conference for Engineering, Education and Technology: “Education, Research and Leadership in Post-pandemic Engineering: Resilient, Inclusive and Sustainable Actions”. Latin American and Caribbean Consortium of Engineering Institutions, 2022. http://dx.doi.org/10.18687/laccei2022.1.1.606.

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Raporty organizacyjne na temat "Synthetic Zeolites"

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Achey, R., O. Rivera, D. Hunter i M. Wellons. Synthesis of zeolite materials for noble gas separation. Office of Scientific and Technical Information (OSTI), wrzesień 2017. http://dx.doi.org/10.2172/1395258.

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Achey, R., O. Rivera, M. Wellons i D. Hunter. Synthesis of Zeolite Materials for Noble Gas Separation. Office of Scientific and Technical Information (OSTI), październik 2017. http://dx.doi.org/10.2172/1395975.

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