@article{MTMT:30487663, title = {Application of Modified Bentonites for Arsenite (III) Removal from Drinking Water}, url = {https://m2.mtmt.hu/api/publication/30487663}, author = {Buzetzky, Dóra and Tóth, Csilla Noémi and M. Nagy, Noémi and Kónya, József}, doi = {10.3311/PPch.12197}, journal-iso = {PERIOD POLYTECH CHEM ENG}, journal = {PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING}, volume = {63}, unique-id = {30487663}, issn = {0324-5853}, abstract = {Four modified bentonites (La(III), Y(III), Fe(III)) were prepared by ion exchange process to remove arsenite (III) ions from water. The modified bentonites were examined with X-ray fluorescence spectroscopy (XRF) and X-ray diffraction (XRD). The rare earth (REE) and Fe(III) ion content in bentonite was higher than the CEC values obtained by ammonium acetate method related to trivalent ions (2.7 x 10(-4) mol g(-1)). The kinetics, equilibrium time, sorption isotherms and desorption experiments were examined. Lanthanum, yttrium and cerium bentonite can bind similar amount of arsenite(III) ions. Iron-bentonite cannot bind significant amounts of arsenite ions. The active sites and the solubilities of the sorption complex were determined. Arsenite (III) ions sorb in the interlayer space as REEAsO3. The solubility of the arsenite complex was two orders of magnitude smaller than that of the phosphate complex. After desorption the eluted amount of arsenite (III) was 55% related to the sorbed amount of arsenite. The d(001) basal spacing of modified bentonites and that of after sorption and desorption was measured. After the sorption of arsenite ion on lanthanum bentonite, the d(001) basal spacing of montmorillonite was decreased and after desorption an increase in d(001) basal spacing was observed again. Modified bentonites can be used for removing arsenic ions from water.}, keywords = {GROUNDWATER; rare earth; Modified bentonite; arsenite (III); sorption experiments}, year = {2019}, eissn = {1587-3765}, pages = {113-121}, orcid-numbers = {Buzetzky, Dóra/0000-0002-9157-3810} } @article{MTMT:30853468, title = {Sorption of pertechnetate anion by cation modified bentonites}, url = {https://m2.mtmt.hu/api/publication/30853468}, author = {Buzetzky, Dóra and Kovács, Eszter Mária and M. Nagy, Noémi and Kónya, József}, doi = {10.1007/s10967-019-06852-8}, journal-iso = {J RADIOANAL NUCL CHEM}, journal = {JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY}, volume = {322}, unique-id = {30853468}, issn = {0236-5731}, year = {2019}, eissn = {1588-2780}, pages = {1771-1776}, orcid-numbers = {Buzetzky, Dóra/0000-0002-9157-3810; Kovács, Eszter Mária/0000-0002-3117-2521} } @article{MTMT:3208230, title = {Use of La-, Ce-, Y-, Fe- bentonites for Removing Phosphate Ions from Aqueous Media}, url = {https://m2.mtmt.hu/api/publication/3208230}, author = {Buzetzky, Dóra and M. Nagy, Noémi and Kónya, József}, doi = {10.3311/PPch.9871}, journal-iso = {PERIOD POLYTECH CHEM ENG}, journal = {PERIODICA POLYTECHNICA-CHEMICAL ENGINEERING}, volume = {61}, unique-id = {3208230}, issn = {0324-5853}, abstract = {Clays play an important role in the environment. By removing cations and anions either through ion exchange, adsorption and precipitation, or all these combined, they can act as nat - ural decontaminating agents of numerous pollutants. In this study, four modified bentonites (La-, Ce-, Y-, Fe-bentonite) were prepared and characterized, and their phosphate sorption capabilities were measured in batch experiments. Equilibrium times were also examined. The activation energy of the sorp - tion process was calculated. The La- , Ce- and Y-bentonite can bind similar amount of phosphate ions, while iron-bentonite can bind only half of it compared to La-, Ce- and Y-bentonite.}, year = {2017}, eissn = {1587-3765}, pages = {27-32}, orcid-numbers = {Buzetzky, Dóra/0000-0002-9157-3810} } @article{MTMT:3097530, title = {Mössbauer study of pH dependence of iron-intercalation in montmorillonite}, url = {https://m2.mtmt.hu/api/publication/3097530}, author = {Kuzmann, Ernő and Garg, VK and Singh, H and de Oliveira, AC and Pati, SS and Homonnay, Zoltán and Rudolf, M and Molnár, ÁM and Kovács, Eszter Mária and Baranyai, Edina and Kubuki, S and M. Nagy, Noémi and Kónya, József}, doi = {10.1007/s10751-016-1314-5}, journal-iso = {HYPERFINE INTERACT}, journal = {HYPERFINE INTERACTIONS}, volume = {237}, unique-id = {3097530}, issn = {0304-3843}, abstract = {57Fe Mössbauer spectroscopy and XRD have successfully been applied to show the incorporation of Fe ion into the interlayer space of montmorillonite via treatment with FeCl 3 in acetone. The 78K 57Fe Mössbauer spectra of montmorillonite samples reflected magnetically split spectrum part indicating the intercalation of iron into the interlayer of montmorillonite via the treatment with FeCl 3+acetone and washed with water until the initial pH=2.3 increased to pH=4.14. It was found that the occurrence of intercalated iron in the form of oxide-oxihydroxide in montmorillonite increases with the pH. Intercalation was confirmed by the gradual increase in the basal spacing d001 with pH. © 2016, Springer International Publishing Switzerland.}, keywords = {pH dependence; Ca-montmorillonite; 57Fe Mössbauer spectroscopy; Interlayer Fe}, year = {2016}, eissn = {1572-9540}, orcid-numbers = {Kuzmann, Ernő/0000-0002-0183-6649; Homonnay, Zoltán/0000-0001-5299-5394; Kovács, Eszter Mária/0000-0002-3117-2521} } @article{MTMT:3030404, title = {Mössbauer study of the effect of rare earth substitution into montmorillonite}, url = {https://m2.mtmt.hu/api/publication/3030404}, author = {Kuzmann, Ernő and Singh, LH and Garg, VK and de Oliveira, AC and Kovács, Eszter Mária and Molnár, ÁM and Homonnay, Zoltán and Kónya, Péter and M. Nagy, Noémi and Kónya, József}, doi = {10.1007/s10751-016-1225-5}, journal-iso = {HYPERFINE INTERACT}, journal = {HYPERFINE INTERACTIONS}, volume = {237}, unique-id = {3030404}, issn = {0304-3843}, abstract = {Novel montmorillonites were prepared by the exchange of the interlayer cations with a series of rare earth cations (La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, and Er) and characterized by XRD, XRF, SEM, chemical analysis and 57Fe Mössbauer spectroscopy. An unexpected magnetically split component, assigned to iron being in the interlayer space, was observed in the Mössbauer spectra at 78K in some rare earth cation exchanged montmorillonite. This paper is the initial report about this observation. The transition of iron from the octahedral site to the interlayer and possible incorporation of rare earths in sites different from those which are in the interlayer space was concluded. © 2016, Springer International Publishing Switzerland.}, keywords = {Mössbauer-spectroscopy; Bentonite; Rare earth substitution; Interlayer Fe}, year = {2016}, eissn = {1572-9540}, orcid-numbers = {Kuzmann, Ernő/0000-0002-0183-6649; Kovács, Eszter Mária/0000-0002-3117-2521; Homonnay, Zoltán/0000-0001-5299-5394} }