Comparative removal of As(V) and Sb(V) from aqueous solution by sulfide-modified α-FeOOH

Li, Q. and Li, R. and Ma, X. and Sarkar, B. and Sun, X. and Bolan, N. (2020) Comparative removal of As(V) and Sb(V) from aqueous solution by sulfide-modified α-FeOOH. Environmental Pollution, 267: 115658. ISSN 0269-7491

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Efficient elimination of As(V) and Sb(V) from wastewater streams has long been a major challenge. Herein, sulfide-modified α-FeOOH adsorbent was fabricated via a simple sulfidation reaction for removing As(V) and Sb(V) from aqueous media. Compared with the pristine α-FeOOH, sulfide-modified α-FeOOH increased the adsorption of As(V) from 153.8 to 384.6 mg/g, and Sb(V) adsorption from 277.8 to 1111.1 mg/g. The enhanced adsorption of both As(V) and Sb(V) was maintained at the pH range from 2 to 11, and was not interfered by various coexisting anions such as Cl−, SO42−, NO3−, SiO32− and PO43−. The adsorption affinity increased from 0.0047 to 0.0915 and 0.0053 to 0.4091 for As(V) and Sb(V), respectively. X-ray photoelectron spectroscopic investigation demonstrated a reductive conversion of As(V) to As(III) during the adsorption process with sulfide-modified α-FeOOH, but with no obvious variation of Sb(V) speciation. While the removal mechanism for As(V) was reduction followed by adsorption via hydroxyl groups, mainly surface complexation was involved in the removal of Sb(V). This study presented a simple strategy to enhance the adsorption capacity and adsorption affinity of α-FeOOH toward As(V)/Sb(V) via sulfide-modification.

Item Type:
Journal Article
Journal or Publication Title:
Environmental Pollution
Additional Information:
This is the author’s version of a work that was accepted for publication in Environmental Pollution. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Environmental Pollution, 267, 2020 DOI: 10.1016/j.envpol.2020.115658
Uncontrolled Keywords:
?? adsorption affinity and capacityarsenic and antimonyiron-based adsorbentsmetalloid speciationsulfide-modificationwastewater treatmentadsorptionsulfur compoundsadsorption affinityadsorption capacitiesenhanced adsorptionsspectroscopic investigationssulfidat ??
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06 Oct 2020 10:10
Last Modified:
12 Dec 2023 01:48