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Influence of Phosphate on Arsenic Adsorption Behavior of Si-Fe-Mg Mixed Hydrous Oxide

Authors :
Marjjuk Ahmed
Tomoyuki Kuwabara
Source :
Toxics, Vol 12, Iss 4, p 280 (2024)
Publication Year :
2024
Publisher :
MDPI AG, 2024.

Abstract

The arsenic adsorption performance of silicon (Si), iron (Fe), and magnesium (Mg) mixed hydrous oxide containing a Si: Fe: Mg metal composition ratio of 0.05:0.9:0.05 (SFM05905) was investigated. SFM05905 was synthesized by the co-precipitation method. Batch experiments on arsenic adsorption were conducted at various temperatures and concentrations. Adsorption isotherms models were represented by a linearized equations and were insensitive to temperature change. The anion selectivity of SFM05905 at single component was high for arsenite (III), arsenate (V), and phosphate (PO4), indicating that PO4 inhibits arsenic adsorption. The adsorption amount of As (III), As (V), and PO4 were compared using a column packed with granular SFM05905, and an aqueous solution was passed by a combination of several anions that are single, binary, and ternary adsorbate systems. As (III) had the highest adsorption amount; however, As (III) and PO4 were affected by each other under the ternary mixing condition. Although the adsorption amount of As (V) was smaller than that of As (III), it was not affected by other adsorbates in the column experiments. Finally, although the adsorption of both arsenic continued, the adsorbed PO4 gradually desorbed.

Details

Language :
English
ISSN :
23056304
Volume :
12
Issue :
4
Database :
Directory of Open Access Journals
Journal :
Toxics
Publication Type :
Academic Journal
Accession number :
edsdoj.677d3755c80a4e1fb191d747227cc817
Document Type :
article
Full Text :
https://doi.org/10.3390/toxics12040280