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Sorption of Boron by Hydrous Al-Oxide

Published online by Cambridge University Press:  28 February 2024

S. G. de Bussetti ,
E. A. Ferreiro  and
A. K. Helmy
S. G. de Bussetti
Affiliation:
Universidad Nacional del Sur, 8000 Bahía Blanca, República Argentina
E. A. Ferreiro
Affiliation:
Universidad Nacional del Sur, 8000 Bahía Blanca, República Argentina
A. K. Helmy
Affiliation:
Universidad Nacional del Sur, 8000 Bahía Blanca, República Argentina
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Abstract

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Boron sorption by hydrous Al-oxide was studied as a function of concentration, pH, temperature and in the presence of oxalate and phosphate. For comparison sorption of B was also measured with charcoal as adsorbent.

At constant pH a Langmuir type equation was found to fit the results well at pH values below 7.2 where only boric acid molecules are present in solution. B sorption was dependent on pH with maximum sorption at pH 8.5. Oxalate and phosphate ligands form strong bonds to AI and were found to reduce B sorption. Sorption of boric acid molecules decreased with increasing temperature and the isosteric heat of reaction was 13.8 kJ mol−1. These results indicate that there are two mechanisms of sorption on hydrous Al-oxide, physical sorption of boric acid molecules and ligand exchange (chemisorption) of borate, and both mechanisms are favored onto the oxide.

Keywords

BoronHydrous Al-oxidepH
Type
Research Article
Information
Clays and Clay Minerals , Volume 43 , Issue 1 , February 1995 , pp. 58 - 62
Copyright
Copyright © 1995, The Clay Minerals Society

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