Removal of Selenium Oxyanions from Aqueous Solutions by Ion Exchange: Equilibrium, Kinetics, and Mechanistic Modeling
Z. Zeng, Z. Shen, J. D. Einkauf, A. P. Ladshaw, R. Custelcean, C. Tsouris, S. Yiacoumi
TL;DR
This study explores how a resin can remove harmful selenium compounds from water, even when sulfate is present.
Contribution
The study provides new insights into the selective removal of selenate over sulfate using ion exchange and confirms the mechanism via X-ray analysis.
Findings
The resin IRA-900 shows higher selectivity for selenate (SeO4^2–) over sulfate (SO4^2–) and selenite (SeO3^2–).
The maximum exchange capacity of the resin was found to be 2.04 mequiv/g.
X-ray photoelectron spectroscopy confirmed ion exchange as the primary removal mechanism.
Abstract
Selenium (Se) is an essential micronutrient but toxic at high concentrations, posing challenges for water treatment. This study investigated the removal of selenate (SeO4 2–) and selenite (SeO3 2–) using the strong-base anion-exchange resin IRA-900, particularly in the presence of competing sulfate (SO4 2–). The performance of the commercially available resin IRA-900 was systematically investigated. The batch equilibrium behavior was studied in both single- and binary-component systems, and the kinetic behavior was investigated in single-component systems. Results confirmed a selectivity order of SeO4 2– > SO4 2– > SeO3 2–, indicating preferential SeO4 2– removal over competing SO4 2– but lower affinity for SeO3 2–. The maximum total exchange capacity was determined to be 2.04 mequiv/g. Furthermore, SeO3 2– uptake was found to be pH-dependent, whereas SeO4 2– uptake remained stable…
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Taxonomy
TopicsSelenium in Biological Systems · Arsenic contamination and mitigation · Adsorption and biosorption for pollutant removal