Bibliographies thématiques / Natural Clinoptilolite

Littérature scientifique sur le sujet « Natural Clinoptilolite »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "Natural Clinoptilolite"

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Matijasevic, Srdjan, Aleksandra Dakovic, Deana Iles et Sonja Milicevic. « Adsorption of uranyl ion on acid-modified zeolitic mineral clinoptilolite ». Chemical Industry 63, no 5 (2009) : 407–14. http://dx.doi.org/10.2298/hemind0905407m.

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In this paper, the results of adsorption of uranyl ion on acid-modified zeolitic mineral clinoptilolite are presented. Adsorption was investigated at different amounts of solid phase in suspension, as well as at different pH values. The modified clinoptilolite samples were obtained by treatment of clinoptilolite with acids: hydrochloric, oxalyc and citric. Starting and modified clinoptilolites were characterized by chemical analysis, thermal (DT/TG) analysis and by determination of cation exchange capacity, while starting and nonadsorbed amounts of uranyl ion were determined by fluorometric method. Uranyl ion adsorption experiments on natural unmodified zeolitic mineral showed that uranyl ion adsorption was low (29.2%) and that treatment of clinoptilolite with acids significantly increases the adsorption of uranyl ion (>90%). In the case of acid treated clinoptilolites, the highest adsorption of uranyl ion was achieved on clinoptilolite modified with hydrochloric acid. Kinetics of adsorption showed that adsorption of uranyl ion begins very fast and that the most of uranyl ion was adsorbed in first 30 min. Practically, there were no changes in uranyl ion adsorption within next 72 h.
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Kowalak, S., et A. Jankowska. « Natural zeolites for styrene oligomerization ». Clay Minerals 46, no 2 (juin 2011) : 189–95. http://dx.doi.org/10.1180/claymin.2011.046.2.189.

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AbstractHydrogen forms of natural mordenite and clinoptilolite were used as catalysts for styrene oligomerization and as matrices to hold the resultant oligomers in order to prepare intense and light-resistant pigments. In contrast to synthetic zeolites of similar pore sizes (mainly H-ZSM-5, H-mordenite), the natural zeolites did not form products with an intense (pink) colouration. H-mordenite samples treated with styrene developed some colour due to styrene oligomers (the chromophore) whereas, in treated clinoptilolites, colour formation was negligible due to the lack of access of styrene molecules into the elliptical channels. The results of catalytic tests for cracking of cumene (cumene and styrene have similar molecular sizes) were consistent with the styrene oligomerization results. They indicate a noticeable catalytic activity with natural H-mordenite and a lack of activity with clinoptilolite. On the other hand, catalytic tests for propan-2-ol decomposition indicate a high activity with both natural zeolites, which confirms the presence of acid sites and their accessibility to small alcohol molecules.
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Nik Malek, Nik Ahmad Nizam, et Siti Aishah Mohd Hanim. « Antibacterial Activity of Amine-Functionalized Silver-Loaded Natural Zeolite Clinoptilolite ». Science Letters 15, no 1 (3 janvier 2021) : 13. http://dx.doi.org/10.24191/sl.v15i1.11790.

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The antibacterial activity of amine-functionalized silver-loaded natural zeolite clinoptilolite was analysed against Gram-negative Escherichia coli ATCC 11229 and a comparison was made with raw clinoptilolite, silver-loaded clinoptilolite, and amine-functionalized clinoptilolite with APTES (3-Aminopropyl) triethoxysilane. Results from the characterization of the samples using Fourier transform infrared (FTIR) spectroscopy showed that the silver-loaded clinoptilolite was functionalized with APTES without affecting the original framework structure of the clinoptilolite. The antibacterial activity of the analysed samples based on disc diffusion technique (DDT) and minimum inhibition concentration (MIC) showed that the silver-loaded clinoptilolite (150 % of cation exchange capacity of clinoptilolite) had the highest antibacterial activity, as compared to amine-functionalized silver-loaded zeolite. This study showed that the functionalization of silver-loaded clinoptilolite could affect the release and action of silver ions to kill or inhibit bacterial growth. However, it showed that the natural zeolite clinoptilolite could become a good carrier system for the antibacterial metal ion, especially silver ions. Keywords: Zeolite, clinoptilolite, antibacterial agent, silver, amine-functionalization
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Nenadovic, Snezana, Ljiljana Kljajevic, Bojan Seslak, Nina Obradovic, Ivana Vukanac et Vladimir Pavlovic. « Cesium removal from aqueous solution by natural mineral clinoptilolite ». Nuclear Technology and Radiation Protection 29, no 2 (2014) : 135–41. http://dx.doi.org/10.2298/ntrp1402135n.

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The aim of this study was to investigate the Cs+ ions sorption on natural minerals clinoptilolite. The analysis of clinoptilolite and clinoptilolite with adsorbed Cs+ ion was con- ducted by X-ray diffraction, scanning electron microscopy, X-ray fluorescence, and gamma spectrometry. The specific activity of naturally occurring radionuclides in clinoptilolite was determined by gamma spectrometry by using the HPGe semiconductor detector. Obtained activity concentrations ranged from 49 Bq/kg to 810 Bq/kg for 40K, 5.7 Bq/kg to 10 Bq/kg for 238U, 5.8 Bq/kg to 70 Bq/kg for 232Th(228Ac), and the presence of artificial radionuclides was not detected (137Cs < 0.02 Bq/kg). The study of the thermal decomposition of raw clinoptilolite and Cs adsorbed clinoptilolite by differential thermal analysis is presented in this paper. The activation energy of the reaction phase transformation of raw clinoptilolite is 156.7 kJ/mol, while Cs adsorbed clinoptilolite is 121.7 kJ/mol. The lower value of activation energy reaction of the phase transformation Cs adsorbed clinoptilolite indicates that Cs which is adsorbed destabilizes the crystal structure of clinoptilolite and thus facilitates the transition to the amorphous state.
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Atkovska, Katerina, Shaban Jakupi, Flakrim Aliu, Stefan Kuvendziev, Mirko Marinkovski et Kiril Lisichkov. « ADSORPTION CHARACTERISTICS OF NATURAL POROUS SORBENTS ». Knowledge International Journal 31, no 3 (5 juin 2019) : 647–52. http://dx.doi.org/10.35120/kij3103647a.

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Zeolites are nano-porous crystalline aluminosilicates. Natural zeolites are non-toxic and safe for humans which expand their application in different fields. Clinoptilolite is the most abundant natural zeolite with high purity that occurs in many parts of the world. It has a frame structure in which the tetrahedra of silicon [SiO4/2] and aluminium [AlO4/2]- are interconnected with oxygen bridge. Cations like K+, Na+ and Ca2+ and water are located in its pores and large cavities. Zeolites have high ion exchange capacity, selective adsorption capacity and thermal and mechanical stability.In this paper, the characterization of the natural zeolite - clinoptilolite from Bulgaria is performed. The investigated clinoptilolite was characterized in terms of its chemical composition, particle size distribution, structural morphology (SEM, XRD, FTIR) and thermal analysis. The chemical analysis show that clinoptilolite contains 69.7% of SiO2 and 11.4% of Al2O3. As specific surface area is the most important characteristic of the materials when used as adsorbents (the most common application of the zeolite) the specific surface area of clinoptilolite was obtained from data of equilibrium adsorption of water vapor at 25oC and using the BET method with nitrogen. To enhance its adsorptive properties clinoptilolite was modified (mechanically activated) and its specific surface area was also determined.
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Znak, Z. О., R. V. Мnykh, М. А. Pyrih et T. V. Zhuk. « RESEARCH OF OIL SORPTION BY NATURAL CLINOPTYLOLITE ». Chemistry, Technology and Application of Substances 5, no 2 (1 décembre 2022) : 58–64. http://dx.doi.org/10.23939/ctas2022.02.058.

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The sorption capacity of natural clinoptilolite of the Transcarpathian field in relation to the Boryslav field oil has been studied. It is shown that the sorption of oil occurs almost immediately after its contact with clinoptilolite. This forms the absorption front, which moves up the zeolite layer. Based on the analysis of the sorption process, it was concluded that lighter fractions of oil are sorbed faster and play the role of "solvent" for heavier fractions. It is shown that the sorption capacity of initial clinoptilolite is slightly higher than that of thermally activated. It was found that with increasing dispersion of clinoptilolite the mass of sorbed oil increases significantly, but the sorption capacity of different fractions, taking into account the height of the working layer differs slightly.
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Malecky, M., M. Shivazad et A. Nikkhah. « Effects of natural zeolite (clinoptilolite) on eggshell quality ». Proceedings of the British Society of Animal Science 2005 (2005) : 168. http://dx.doi.org/10.1017/s1752756200010796.

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Using inorganic additives is one suggested approach for improvement of performance or for preventing some disorders and poisoning of farm animals. One of those which use in animal diets is zeolite. There are more than 40 types of natural zeolites, of which one of the commonest is Clinoptilolite. Clinoptilolite has a relatively constant crystalline structure and has good adsorption properties. One of the most important problems in the poultry industry is low eggshell quality, particularly at end of lay. This leads to problems such as the breaking of egg in transport. Research on this has indicated positive effects of zeolites. Adding 1.5% clinoptilolite causes a significant increase in the calcium CA concentration of serum (Hossein et al., 1994). Olver (1989) observed a significant increase in eggshell thickness when 5% clinoptilolite was added to the diet of laying hens. The purpose of present study was to investigate the effect of different dietary concentrations of clinoptilolite on some blood parameters and eggshell quality.
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Lilkov, V., O. Petrov et Y. Tzvetanova. « Rheological, porosimetric, and SEM studies of cements with additions of natural zeolites ». Clay Minerals 46, no 2 (juin 2011) : 225–32. http://dx.doi.org/10.1180/claymin.2011.046.2.225.

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AbstractRheological, porosimetric, and SEM studies of cements with additions of natural zeolites (chabazite, mordenite and clinoptilolite) were investigated. The addition of 5% zeolite to cement pastes had a plastifying effect. The increase in the rheological parameters of aqueous cement–zeolite suspensions began after additions of more than 10% zeolite. At a water/solid ratio (w/s) = 0.5 all compositions exhibited similar rheological behaviour for yield stress and maximum shear stress values. At lower w/s values the rheology depended on the zeolite used, decreasing in the order Sl (clinoptilolite, Nižny Hrabovec deposit, Slovakia), M (mordenite, Philipines), Bp (clinoptilolite, Beli Plast deposit, Bulgaria), NM (clinoptilolite, Saint Cloud deposit, New Mexico) and Ch (chabazite, Nasm Yan deposit, Korea).After 28 days of hydration the mixtures containing 10% Bp clinoptilolite, mordenite, and Sl clinoptilolite (up to 30%) had unchanged specific pore volumes but additions of 10% and 30% of chabazite and NM clinoptilolite and of 30% mordenite and Bp clinoptilolite lead to increases in the total specific pore volume compared to the neat cement paste. Between the 28th and 180th days of hydration the specific volume of the pores in all the cement-zeolite pastes decreased due to the filling of the pores with products from the pozzolanic reaction between the zeolites and the hydration products of the cement.The pozzolanic reaction between zeolite and the hydration products of cement is enhanced by the zeolite content in the samples and depends on the Si/Al ratio (clinoptilolite (Si/Al >4.5), mordenite (Si/Al >5), chabazite (Si/Al <2.5)) and the surface area (clinoptilolite from Slovakia has the smallest crystallites and, hence, the greatest reactive surface area).
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Szala, Barbara, Tomasz Bajda et Anna Jeleń. « Removal of chromium(VI) from aqueous solutions using zeolites modified with HDTMA and ODTMA surfactants ». Clay Minerals 50, no 1 (mars 2015) : 103–15. http://dx.doi.org/10.1180/claymin.2015.050.1.10.

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AbstractThe removal of Cr(VI) from aqueous solutions under various conditions was investigated using a natural clinoptilolite and a synthetic zeolite derived from fly-ash (Na-P1), modified either with hexadecyltrimethylammonium bromide (HDTMA) or octadecyltrimethylammonium bromide (ODTMA). The study was focused mainly on the impact of the properties of the zeolite on the sorption capacity, the sorption mechanism, the influence of pH and the durability of the immobilization. The zeolites were modified with HDTMA and ODTMA surfactants up to 100% and 120% of their external cation exchange capacity. Batch and column studies were conducted to evaluate the influence of pH and the initial Cr(VI) concentration on their efficiencies for removing chromates. The organo-zeolites show a significant ability to remove Cr(VI) from aqueous solutions. The amount of Cr(VI) removed by organo-clinoptilolite and organo-zeolite Na-P1 is greater at low pH values, whereas the sorption efficiency decreased with increasing pH. Sorption of Cr(VI) was more efficient with the HDTMA-modified organo-clinoptilolite (150 mmol Cr(VI)/kg) than the ODTMA-modified clinoptilolite (132 mmol Cr(VI)/kg). The maximum sorption capacity was obtained with the 1.2 × ECEC ODTMA-modified clinoptilolite (237 mmol Cr(VI)/kg). The organozeolites Na-P1 adsorbed Cr(VI) from aqueous solutions more effectively and were much more durable than the organo-clinoptilolites.
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Forughirad, Abdollah, Ataallah Bahrami, Khalil Farhadi, Anahita Fathi Azerbaijani et Fatemeh Kazemi. « COMPARATIVE OF NATURAL ZEOLITE – CLINOPTILOLITE ELIMINATION OF METAL IONS/ESPECIALLY Cu (II) WITH D-PENICILLAMINE FROM BIOLOGICAL ENVIRONMENTS ». Rudarsko-geološko-naftni zbornik 36, no 4 (2021) : 11–19. http://dx.doi.org/10.17794/rgn.2021.4.2.

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Clinoptilolite is used as an adsorbent to remove heavy metal cations due to its function as a molecular sieve. This molecular sieve characteristic has made it possible to study the efficiency of clinoptilolite and D-Penicillamine in a comparative way in terms of the adsorption of heavy metals (especially copper) from a biological medium. For this purpose, clinoptilolite was subjected to grinding to produce a homogenized micronized powder in two sizes with d90=75 and 150 μm. Then, initial adsorption tests in an aqueous medium were performed on 10 ppm solutions of iron, zinc, copper, cadmium and nickel cations in single cation solutions, as well as a mixture of cations. In the next step, tests were performed to evaluate the adsorption of Cu2+ on clinoptilolite under different conditions. Experiments have been performed to investigate the effect of pH, temperature (T), adsorbent dosage, time and cation concentration in a simulated biological medium. According to the results, clinoptilolite has a high ability to remove metal cations from aqueous solutions. The 99.71% removal of copper cations by clinoptilolite indicates the high ability of this mineral to remove copper from any environment. In a simulated biological medium at pH=7 and 5, the copper adsorption rate was 98.18% and 97.45% respectively, which indicates the high ability of zeolite to absorb copper cations under biological conditions. An examination of the mass balance calculations has also shown the ability to replace clinoptilolite with penicillamine; 15 mg of clinoptilolite removes 214 mg of Cu from aqueous solutions, which is equivalent to the formation of copper-penicillamine chelate.
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Thèses sur le sujet "Natural Clinoptilolite"

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Cansever, Beyhan Ülkü Semra. « Treatment of domestic wastewater with natural zeolites/ ». [s.l.] : [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000456.doc.

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Guvenir, Ozge. « Synthesis And Characterization Of Clinoptilolite ». Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12606392/index.pdf.

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Clinoptilolite is the most abundant zeolite mineral in nature. In this study a reproducible synthesis recipe for clinoptilolite was established and the limits of the crystallization field were developed by changing synthesis parameters such as temperature, composition and the nature of reactants. Clinoptilolite was reproducibly synthesized as a pure phase and in high yield at 140oC using a benchmark batch composition of 2.1 Na2O:Al2O3:10SiO2:110.1 H2O. Clinoptilolite was crystallized from 10wt% or 28wt% seeded systems while it was not formed if no seeds were present. Clinoptilolite was also crystallized as a pure phase when the cation in the benchmark batch composition was Na,K mixture, or when alkali salts such as carbonates or chlorides were used besides alkali hydroxides, or when the SiO2/Al2O3 ratio was in the range of 10-12. Clinoptilolite was still crystallized as a single phase when alkali hydroxides in the batch were reduced by 20%. With the benchmark batch composition, clinoptilolite was crystallized in pure phase form at 100oC, 120oC, 140oC and 160oC while synthesis at 175oC resulted in the formation of pure mordenite. At 140oC clinoptilolite was crystallized together with Linde L when cation in the benchmark composition is only potassium. Phillipsite crystallized together with clinoptilolite at SiO2/Al2O3 ratio of 8 to 9. At SiO2/Al2O3 ratios of 6 or 4, phillipsite or analcime was formed as pure phase respectively. When the alkali hydroxides in the batch was increased by 20%, sanidine was formed. Use of reactive aluminosilicate gels enhanced the formation of clinoptilolite while attempts to use mineral raw materials were unsuccessful. For both Na and (Na,K)-clinoptilolite, Si/Al ratio of products were greater than four. Thermal stability of synthetic clinoptilolites were comparable with natural clinoptilolite and potassium ion increased thermal stability of clinoptilolite.
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Polatoğlu, İlker Özkan Fehime. « Chemical behaviour of clinoptilolite rich natural zeolite in Aqueous medium / ». [S.l. : s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000352.pdf.

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Thesis (Master)--İzmir Institute Of Technology, İzmir, 2005.
Keywords: Natural zeolite, clinoptilolite, aqueous media, ion exchange, adsorption. Includes bibliographical references (leaves . 70-73).
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Yetgin, Senem İnal Fikret. « Investigation of Fuel Oxygenate Adsorption On Clinoptilolite Rich Natural Zeolite/ ». [s.l.] : [s.n.], 2006. http://library.iyte.edu.tr/tezlerengelli/master/kimyamuh/T000582.pdf.

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Farias, Piñeira Tania. « Materiales Compuestos Zeolita-Surfactante-Fármaco con Uso Potencial en la Industria Farmacéutica ». Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20204/document.

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Ce travail étudie les matériaux composites zéolithes surfactifs, principes actifs pour des applications pharmaceutiques. D'abord sont identifiées les principales propriétés physiques, chimiques et biologiques des matériaux, requises pour des applications en tant que supports médicamenteux ciblant certaines formes de cancer. Par la suite sont décrits les différentes étapes de formulation des supports médicamenteux à base des zéolithes naturelles, les caractéristiques des matériaux intermédiaires ainsi obtenus, ainsi que les mécanismes des phénomènes interfaciaux à l'origine de l'action de ces matériaux. La dernière partie est consacrée à l'étude d'un relargage contrôlé des principes actifs de l'interface jusque dans un milieu aqueux modèle
This work studies the composite zeolites surfactants, active principles for pharmaceutical applications. First identified the main physical, chemical and biological materials, required for applications as drug carriers targeting some cancers. Subsequently described the various stages of formulation of drug carriers based on natural zeolites, the characteristics of intermediate materials obtained, and the mechanisms of interfacial phenomena at the origin of the action of these materials. The last part is devoted to the study of controlled release of active ingredients of the interface into a model aqueous medium
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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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Stead, Karen. « Environmental implications of using the natural zeolite clinoptilolite for the remediation of sludge amended soils ». Thesis, University of Surrey, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248074.

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Akar, Dilek Shahwan Talal. « Physicochemical characterization of the sorption behavior of Cs+ and Sr2+ Ions on natural kaolinite and cliptilolite minerals/ ». [s.l.] : [s.n.], 2005. http://library.iyte.edu.tr/tezler/master/kimya/T000489.pd.

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Fernández, Juan Carlos Torres. « Seletividade da Clinoptilolita natural por metais tóxicos em sistemas aquosos ». Universidade Federal de São Carlos, 2004. https://repositorio.ufscar.br/handle/ufscar/3930.

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Made available in DSpace on 2016-06-02T19:55:36Z (GMT). No. of bitstreams: 1 TeseJCTF.pdf: 3670025 bytes, checksum: 32289c02fa0f16236c28137ea6d2a96c (MD5) Previous issue date: 2004-12-13
Universidade Federal de Sao Carlos
Natural zeolites are the most important inorganic cationic exchangers exhibiting high ion exchange capacity, selectivity and environment compatibility. Heavy metals are well known for toxicity and their disposal is a significant industrial waste problem. The goal of this work was directed to evaluate the selectivity of a purified homo-ionic clinoptilolite mineral for aqueous Pb2+, Zn2+, Cu2+ and Na+ ions at 0,005 eq/L and 303 K, interpreted through the application of empirical thermodynamic models to the zeolite phase (Margules, Van Laar, Wilson) coupled with a well established ion-interaction approach for the electrolyte solution (Pitzer). The present study considered the following stages: (1) adsorbent material: preparation and characterization; (2) aqueous solutions: nitrates of sodium, lead, zinc and copper; (3) equilibration of weighed amounts of homo-ionic clinoptilolite with a series of solutions containing the two competing cations; (4) analysis for aqueous cations by AAE; (5) construction of the equilibrium points; isotherm analysis; (6) test for thermodynamic reversibility; (7) empirical models for the zeolite phase (admitted as a solid solution) jointed to the ion-interaction model chosen for the aqueous solution; (8) equilibrium constant and Gibbs free energy for the ion-exchange reactions; phenomenological interpretation of the thermodynamic parameters obtained by means of the application of empirical models to the zeolite phase. The above procedure was, in the same way, followed for the ternary systems. The results obtained in this work shown that the empirical models adopted for the solid phase coupled to Pitzer s model for the activity coefficients in the electrolyte solution describe successfully the binary ion-exchange equilibria. The calculated equilibrium constant and the corresponding Gibbs free energy for each binary-exchange reaction resulted in a selectivity sequence, at the normality and temperature of this study, easily deduced as: 2 2 2 Pb Na Cu Zn + + + + > > . Besides, the parameters estimated applying the Margules , Van Laar s and Wilson s equations for cations in the solid binary mixture resulted in useful values quantifying adequately the cation zeolite framework interactions, thus, an alternative way to interpret the adsorbent selectivity from the charge and cationic radius effect. The ternary parameters obtained applying multi-component empirical models do not explain properly the non-ideality of ions in a solid mixture containing more than two components. This is in accordance with the results encountered in a number of publications on crystal structure of heulandite-group zeolites: these aluminosilicates are found to contain crystallographically distinct set of sites throughout the exchanger framework and that normally each set of sites is partially populated by the exchanging ions. As a consequence, activity coefficients for a multi-component exchange reaction cannot be predicted from appropriate binary data for a heterogeneous exchanger, since the phenomenological binary coefficients are complicated functions of each site set, population and composition, and both these properties will change on introducing other species of ion in the exchanger. In this sense, and from what were obtained here, is believed that multi-component solid phase nonideality must, at least, be interpreted through the application of statistical thermodynamic models considering the energetic heterogeneity of a number of site set and the charge density of the specific zeolite framework.
Obs.: Devido a restrições dos caracteres especias, verifcar resumo em texto completo para download. As zeólitas naturais constituem os trocadores iônicos inorgânicos mais importantes, as quais mostram elevada capacidade de troca iônica, seletividade e compatibilidade com o ambiente natural. Os metais pesados são conhecidos pela sua toxicidade e seus depósitos constituem o maior problema quanto a despejos industriais. Os objetivos básicos deste trabalho foram a interpretação do equilíbrio de adsorção e a avaliação da seletividade de um mineral de clinoptilolita purificado e homo-iônico por Pb2+, Zn2+, Cu2+ e Na+ aquosos à normalidade de 0,005 eq/L e temperatura de 303 K. O estudo proposto foi feito obedecendo as seguintes etapas: (1) preparação e caracterização do material adsorvente; (2) preparação e análise de soluções eletrolíticas; (3) equilíbrio termodinâmico de clinoptilolita homo-iônica com soluções contendo os dois cátions competitivos; (4) análises, no equilíbrio, das soluções mediante EAA; (5) construção dos pontos experimentais e análise das isotermas; (6) testes de reversibilidade termodinâmica; (7) uso de modelos empíricos para a fase zeólita, admitida como uma pseudo-solução, e modelos de interação iônica para a solução eletrolítica; (8) análise da constante de equilíbrio e da energia livre de Gibbs das reações de troca binárias e interpretação fenomenológica dos parâmetros termodinâmicos. Os resultados obtidos mostraram que os modelos adotados para a fase zeólita, considerada como uma mistura, junto com o modelo de Pitzer para os coeficientes de atividade na solução eletrolítica descrevem com sucesso o equilíbrio de troca binária dos sistemas estudados. A constante de equilíbrio calculada e a correspondente energia livre de Gibbs, para cada reação de troca binária à normalidade e temperatura estudadas, resultaram numa seqüência de seletividade dada por: 2 2 2 Pb Na Cu Zn + + + + > > . Paralelamente, os parâmetros estimados através do o uso das equações de Margules, Van Laar e Wilson para os cations na mistura binária resultaram em valores úteis na quantificação das interações cátion estrutura. Desta forma, a avaliação destes parâmetros constituiu uma alternativa na interpretação da seletividade do adsorvente pelos diferentes cátions de troca a partir do efeito do raio e da carga dos cátions. Os parâmetros ternários obtidos através da aplicação de modelos clássicos de estrutura multicomponente resultaram não satisfatórios na interpretação fenomenológica da mistura de mais de dois componentes. Este resultado confirma o encontrado em estudos sobre a estrutura cristalina das zeólitas tipo heulandita: estes aluminosilicatos geralmente contêm grupos de sítios cristalográficos distinguíveis e, por outro lado, que os coeficientes de atividade dos íons em cada tipo de sítios é uma função fortemente dependente da composição e população destes. Desta forma, a inclusão de um terceiro componente torna extremamente complicada a predição e interpretação dos coeficientes de atividade fenomenológicos na mistura sólida multicomponente. Neste sentido e, a partir dos resultados deste estudo, acredita-se que a interpretação da não idealidade da mistura sólida multicomponente deve ser feita através do uso de modelos que considerem a heterogeneidade energética dos diferentes grupos de sítios dentro da zeólita, acoplado a considerações da termodinâmica estatística que têm em conta a população e composição em cada grupo de sítios, além da densidade de carga da rede cristalina do adsorvente.
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Mabovu, Bonelwa. « Brine treatment using natural adsorbents ». Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3665_1319180742.

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The current study investigated application of natural adsorbents in brine treatment. Brines are hypersaline waters generated in power stations and mining industries rich in Mg2+, K+, Ca2+, Na+, SO4 2- , Cl- and traces of heavy metals, thus there is a need for these brines to be treated to recover potable water and remove problematic elements. Natural adsorbents have been successfully used in waste water treatment because of their high surface area and high adsorptive properties when they are conditioned with acid or base. The investigation of pH showed that natural adsorbents did not perform well at low pH of 4 and 6. The adsorbents were able to work efficiently at the natural pH of 8.52 of the brine solution. These results show that natural adsorbents hold great potential to remove cationic major components and selected heavy metal species from industrial brine wastewater. Heterogeneity of natural adsorbents samples, even when they have the same origin, could be a problem when wastewater treatment systems utilizing natural clinoptilolite and bentonite are planned to be developed. Therefore, it is very important to characterize the reserves fully in order to make them attractive in developing treatment technologies.
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Livres sur le sujet "Natural Clinoptilolite"

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Geological Survey (U.S.), dir. Ion exchange capture of copper, lead, and zinc in acid-rock drainages of Colorado using natural clinoptilolite : Preliminary field studies. [Denver, CO?] : U.S. Geological Survey, 1992.

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Chapitres de livres sur le sujet "Natural Clinoptilolite"

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Bish, David L., et Jeremy M. Boak. « 5. Clinoptilolite-Heulandite Nomenclature ». Dans Natural Zeolites, sous la direction de David L. Bish et Douglas W. Ming, 207–16. Berlin, Boston : De Gruyter, 2001. http://dx.doi.org/10.1515/9781501509117-007.

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Langella, A., P. Cappelletti, G. Cerri, D. L. Bish et M. de’ Gennaro. « Distribution of Industrial Minerals in Sardinia (Italy) : Clinoptilolite Bearing Rocks of the Logudoro Region ». Dans Natural Microporous Materials in Environmental Technology, 237–52. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4499-5_16.

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Martínez, M., L. Duro, M. Rovira et J. Pablo. « Sorption of Cadmium(II) and Nickel(II) on a Natural Zeolite Rich in Clinoptilolite ». Dans Natural Microporous Materials in Environmental Technology, 327–34. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4499-5_22.

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Tarasevich, Yu I. « Preparation of a Modified Adsorbent Based on Clinoptilolite and Its Application for The Removal of Iron and Manganese Ions from Artesian Water ». Dans Natural Microporous Materials in Environmental Technology, 381–86. Dordrecht : Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4499-5_28.

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Beler-Baykal, B., M. N. Taher et M. Altinbas. « A Suggestion on Nutrient Removal/Recovery from Source Separated Human Urine Using Clinoptilolite Combined with Anaerobic Processing ». Dans Frontiers in Water-Energy-Nexus—Nature-Based Solutions, Advanced Technologies and Best Practices for Environmental Sustainability, 325–28. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13068-8_81.

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Kalló, D., et J. Papp. « Wastewater treatment with natural clinoptilolite : A new additive ». Dans Studies in Surface Science and Catalysis, 699–706. Elsevier, 1999. http://dx.doi.org/10.1016/s0167-2991(99)80276-6.

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Predescu, L., F. H. Tezel et P. Stelmack. « Adsorption of nitrogen and methane on natural clinoptilolite ». Dans Zeolites : A Refined Tool for Designing Catalytic Sites, Proceedings of the International Zeolite Symposium, 507–12. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81931-2.

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Yoon, Jik-Hyun, Jong-Ho Van, Kim et Dae-Won Park. « 106 Catalytic degradation of mixed plastics over natural clinoptilolite catalysts ». Dans Science and Technology in Catalysis 2002, Proceedings of the Fourth Tokyo conference on Advance Catalytic Science and Technology, 467–68. Elsevier, 2003. http://dx.doi.org/10.1016/s0167-2991(03)80263-x.

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Rodríguez-Fuentes, G., GarcíaP Ávila, I. Rodríguez Iznaga, Barceló^M Rebollar, Laza^M Betancourt, Rosabal^B Concepción et N. Bogdanchikova. « Environmental remediation uses of honeycomb monoliths based on natural clinoptilolite ». Dans Studies in Surface Science and Catalysis, 2555–59. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80523-8.

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Rivera, A., L. M. Rodríguez-Albelo, G. Rodríguez-Fuentes et E. Altshuler. « 32-P-07-Interaction studies between aspirin and purified natural clinoptilolite ». Dans Studies in Surface Science and Catalysis, 373. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81881-4.

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Actes de conférences sur le sujet "Natural Clinoptilolite"

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Toledo-Flores, Susana Elvia, Gabriel T. Mondragón, Jose A. G. Mariscal, Patricia Amador et Patricia Amador. « Natural Clinoptilolite in Solar Refrigeration ». Dans ISES Solar World Congress 2011. Freiburg, Germany : International Solar Energy Society, 2011. http://dx.doi.org/10.18086/swc.2011.20.25.

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Pandova, Iveta. « APPLICATION OF NATURAL CLINOPTILOLITE FOR HEAVY METALS REDUCING IN WATERS ». Dans 14th SGEM GeoConference on ECOLOGY, ECONOMICS, EDUCATION AND LEGISLATION. Stef92 Technology, 2014. http://dx.doi.org/10.5593/sgem2014/b52/s20.005.

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Wahono, Satriyo Krido, Dwi Joko Prasetyo, Tri Hadi Jatmiko, Diah Pratiwi, Andri Suwanto, Hernawan et Krasimir Vasilev. « Multi-stage dealumination for characteristic engineering of mordenite-clinoptilolite natural zeolite ». Dans THE 11TH REGIONAL CONFERENCE ON CHEMICAL ENGINEERING (RCChE 2018). Author(s), 2019. http://dx.doi.org/10.1063/1.5095022.

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Ying Zhang et Erping Bi. « Effects of dissolved humic acid on ammonium sorption to natural chinese clinoptilolite ». Dans 2011 International Symposium on Water Resource and Environmental Protection (ISWREP). IEEE, 2011. http://dx.doi.org/10.1109/iswrep.2011.5893173.

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Cadar, Oana. « BEHAVIOUR OF SOME CLINOPTILOLITE RICH NATURAL ZEOLITES FROM ROMANIA IN SIMULATED BIOLOGICAL FLUIDS ». Dans 19th SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings. STEF92 Technology, 2019. http://dx.doi.org/10.5593/sgem2019/1.1/s01.008.

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Rakitskaya, T. L., E. V. Kameneva, T. A. Kiose et V. Ya Volkova. « Solid-state compositions for low-temperature sulphur dioxide oxidation consisting of natural clinoptilolite, copper(II) and halide ions ». Dans 2014 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2014. http://dx.doi.org/10.1109/omee.2014.6912424.

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Al Ghazawi, Ziad Deeb, et Esra�a Omar Al Diabat. « SALINITY REMOVAL OF RECLAIMED WASTEWATER USING NATURAL AND MODIFIED ZEOLITE AND NANO ZEOLITE PARTICLES ». Dans 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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Radulescu, Hortensia, Isidora Radulov, Laura Smuleac et Adina Berbecea. « IMPACT OF SOIL TREATMENT WITH ZEOLITIC VOLCANIC TUFF ». Dans 22nd SGEM International Multidisciplinary Scientific GeoConference 2022. STEF92 Technology, 2022. http://dx.doi.org/10.5593/sgem2022/3.1/s13.32.

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The paper presents the effect of zeolitic volcanic tuff on soil fertility as a consequence of treating soil with zeolitic tuff supplies (clinoptilolite rich tuff). This high silicon tuff type and the essential features of the clinoptilolite has generated in time changes in soil properties like soil reaction, an effective pH buffering, increase of water absorption and cation exchange properties. The effect of using three different doses of zeolitic volcanic tuff, with and without ammonium nitrate addition as fertilizer, on acid soils was assessed by means of physical and chemical soil parameters, biomass and grain yields. The pH increase of soil treated by zeolitic volcanic tuff alone or mixed with ammonium nitrate confirmed the buffering effect and suggested the opportunity of using zeolitic volcanic tuff for conditioning and remedying acid soils. An increase of soil humidity and the enrich of calcium, magnesium and potassium content in soil was also observed. The analysis of extractable mineral content showed the contribution of zeolitic tuff on increasing soil mineral content and fertility. Global soil fertility enhance, particularly in the neighborhood of the rhizosphere, was reflected also by biomass and grain yields increase. The obtained results showed the benefit of using zeolitic volcanic tuff in conjunction with ammonium nitrate to restore the fertility of low fertile soils. The usefulness of this paper is to inform about the zeolitic volcanic tuff features and its action as soil treatment on soil quality. The importance of this research lies in presenting a technology to restore soils with low fertility using a rather cheap natural resource and an alternative for practicing an ecological agriculture.
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Mimura, Hitoshi, Minoru Matsukura, Fumio Kurosaki, Tomoya Kitagawa, Akira Kirishima et Nobuaki Sato. « Multi-Nuclide Separation Using Different Types of Zeolites ». Dans 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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Bablitch, Douglas, Rupeet Malhotra, Rick Frappa et Scott Warner. « Design and Installation of a Permeable Treatment Wall to Passively Remove Strontium-90 From Groundwater at a Former Commercial Nuclear Fuel Reprocessing Facility in New York ». Dans ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59292.

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A permeable treatment wall (PTW) was designed and installed at the West Valley Development Project (WVDP), a former commercial nuclear fuel reprocessing facility in New York, to passively remove and contain the expansion of strontium-90 (Sr-90) in the site groundwater. AMEC engineers and geologists have collaborated with researchers at the State University of New York at Buffalo (UB) and West Valley Environmental Services LLC to design and install an approximately 260 meter (860-foot) long by 0.9 meter (3-foot) thick zone of granular zeolite (a natural aggregate composed of approximately 85 percent of the mineral clinoptilolite) that will remove Sr-90 in situ from groundwater through ion-exchange reactions. The PTW was designed to meet the functional objectives for up to 20 years; performance monitoring will be conducted regularly and will be used to assess the lifetime efficacy of the PTW. The zeolite-filled PTW was the selected remedial alternative due to its hydraulically passive operations and lower life-cycle cost over other more traditional active treatment alternatives such as pump and treat. The design relied heavily on detailed site characterization of site soils and groundwater conditions and bench and pilot scale evaluations of various zeolite materials. The design specified the use of a one-pass trencher to simultaneously remove unconsolidated aquifer material composed of glaciofluvial-derived silt, sand, and gravel from ground surface to depths up to approximately 9 meters (30 feet) and replace the excavated zone with zeolite along the entire alignment while keying the PTW at least 0.9 meter (3 feet) into the underlying low-permeability glacial till. Several technology demonstrations were conducted to assess implementability using the one-pass trencher prior to completing the final design. During full-scale implementation, excavated sediment was conveyed directly into a prefabricated containment structure pending final disposition. The passive design provides a cost effective and sustainable alternative for treatment of Sr-90 and potentially other exchangeable radioactive ions in groundwater where these constituents migrate in unconsolidated materials.
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