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Issue 22, 2017, Issue in Progress
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Immobilization of selenite from aqueous solution by structural ferrous hydroxide complexes

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Abstract

Ferrous hydroxyl complexes (FHCs) were synthesized by precipitation from Fe(II) sulfate salts with sodium hydroxide in an anoxic atmosphere. Effects of the [Fe(II)]/[OH] ratio, dosage and sequential extraction scheme were elaborated on selenium (Se)(IV) removal by FHCs. Se(IV) removal by FHCs was more coincident with the pseudo-second order kinetic model. The BET isotherm was the best fit model for the data of equilibrium experiments and R2 was 0.9902. Se(IV) removal by FHCs changed with various [Fe(II)]/[OH] ratios, and the maximum removal capacity was 256.41 mg g−1 by FHC ([Fe(II)]/[OH] = 1 : 2). X-ray photoelectron spectroscopy results indicated the mechanism of Se(IV) removal by FHC([Fe(II)]/[OH] = 1 : 1) to be a combination of adsorption and reduction, whereas reduction was the primary mechanism for Se(IV) removal by FHC([Fe(II)]/[OH] = 1 : 4). A sequential extraction scheme was employed to study Se speciation before and after the reaction. Se species were classified into five groups (water-soluble, exchangeable, elemental Se, oxide-containing iron state, selenide). Results indicated that elemental Se was the primary species in the reaction products.

Graphical abstract: Immobilization of selenite from aqueous solution by structural ferrous hydroxide complexes

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Supplementary files

Article information


Submitted
03 Nov 2016
Accepted
09 Jan 2017
First published
27 Feb 2017

This article is Open Access

RSC Adv., 2017,7, 13398-13405
Article type
Paper

Immobilization of selenite from aqueous solution by structural ferrous hydroxide complexes

Y. Zhang, M. Fu, D. Wu and Y. Zhang, RSC Adv., 2017, 7, 13398
DOI: 10.1039/C6RA26225B

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