Removal of arsenate and antimonate by acid-treated Fe-rich clays

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916889" target="_blank" >RIV/60461373:22310/18:43916889 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15310/18:73587909
Result on the web
<a href="http://dx.doi.org/10.1016/j.jhazmat.2018.06.028" target="_blank" >http://dx.doi.org/10.1016/j.jhazmat.2018.06.028</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.jhazmat.2018.06.028" target="_blank" >10.1016/j.jhazmat.2018.06.028</a>

Result language
angličtina
Original language name
Removal of arsenate and antimonate by acid-treated Fe-rich clays
Original language description
Iron impurities in clays degrade the quality in many aspects, but available Fe oxides can significantly improve adsorption affinity of clays to anionic particles. Two natural Fe-rich clays (kaolin and bentonite) were treated in 0.5 M HCl (pH = 1.1) and 0.15 M (COOH)(2) (pH = 1.2), and then used to adsorb As-V/Sb-V oxyanions from model solutions. After acid leaching, the equilibrium sorption capacities (q(max)) increased from 2.3 x 10(-3) to 39.2 x 10(-3) mmol g(-1) for As-V and from 2.4 x 10(-3) to 40.1 x 10(-3) mmol g(-1) for Sb-V, more than doubling the adsorption yields approximate to 95%) of both oxyanions. Leaching in 0.5 M HCl enhanced both As-V and Sb-V adsorption, whereas leaching in 0.15 M (COOH)(2) mainly improved the adsorption of Sb-V. Bentonite, which contained fewer crystalline forms of Fe, exhibited better sorption properties for both oxyanions. The leaching of Fe followed first-order kinetics, whereas the adsorption of As-V/Sb-V followed second-order kinetics. Acid leaching of Fe-rich clays can be used for the preparation of highly selective anionactive sorbents.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy

Project
<a href="/en/project/GA16-13778S" target="_blank" >GA16-13778S: Waste ceramics as selective sorbent of toxic ions: characterization, methodology and application</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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