Počet záznamů: 1
Spying on Fe ions and their role in modified aluminosilicates during the sorption of anions using solid-state NMR spectroscopy
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SYSNO ASEP 0469645 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Spying on Fe ions and their role in modified aluminosilicates during the sorption of anions using solid-state NMR spectroscopy Tvůrce(i) Kobera, Libor (UMCH-V) RID, ORCID
Abbrent, Sabina (UMCH-V) RID, ORCID
Holcova, L. (CZ)
Urbanová, Martina (UMCH-V) RID, ORCID
Koloušek, D. (CZ)
Doušová, B. (CZ)
Brus, Jiří (UMCH-V) RID, ORCIDZdroj.dok. Microporous and Mesoporous Materials. - : Elsevier - ISSN 1387-1811
Roč. 241, 15 March (2017), s. 115-122Poč.str. 8 s. Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova paramagnetic NMR shift ; solid-state NMR ; aluminosilicate Vědní obor RIV JN - Stavebnictví Obor OECD Civil engineering CEP GA13-24155S GA ČR - Grantová agentura ČR GA16-13778S GA ČR - Grantová agentura ČR Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000395842200015 EID SCOPUS 85009499845 DOI https://doi.org/10.1016/j.micromeso.2016.12.030 Anotace Post-synthetic modifications of zeolites enable their possible use as adsorbents in separation and purification processes. Here, we present a multinuclear (29Si, 27Al, 31P) magnetic resonance study of solid samples of zeolite A (LTA) and hydroxysodalite (HS), their post-synthetic modification using FeSO4 solution, and the results of their analysis by NMR after the anion (PO43-) adsorption process. High-resolution 29Si and 27Al MAS NMR spectra provide valuable structural information on the oxidation of Fe2+ ions to Fe3+ species during the modification process, whereas 27Al 3Q/MAS solid-state NMR spectra of LTA and HS unveil a simultaneous dealumination process characteristic of acid leaching in aluminosilicate systems. 31P solid-state NMR spectra of LTA and HS, collected at “very-fast” spinning speed, revealed a dramatic change in the chemical shift values for the phosphates present, directly characteristic of FePO4 in the case of LTA, and phosphates of alkali and/or alkaline earth metals in the case of HS. Moreover, density functional theoretical (DFT) computations provide satisfactory agreement with the obtained 27Al and 29Si experimental data. This work demonstrates possible NMR approaches to the characterization of complex framework materials and provides key insights into aluminosilicate materials affected by unpaired electron(s). Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2017
Počet záznamů: 1