Chemical and toxicological assessment of arsenic sorption onto Fe-sericite composite powder and beads
Abstract Batch sorption and leaching of arsenic (1–30mgL −1 ) on Fe-sericite composite powder and beads were investigated in this study. Fe-sericite composite powder was made from natural sericite modified with iron, and alginate was used to transform the powder into beads. The maximum sorption capacities of the Fe-sericite composite powder (15.04 and 13.21mgg −1 for As(III) and As(V), respectively) were higher than those of the corresponding beads (9.02 and 7.11mgg −1 for As(III) and As(V), respectively) owing to the higher specific surface area of the powder. In addition, the leaching amounts of As(III) from Fe-sericite composite beads (≤ 15.03%) were higher than those of the corresponding powder (≤ 5.71%). However, acute toxicity of As(III)-sorbed Fe-sericite composite beads toward Daphnia magna was not significantly different from that of the corresponding powder ( p > 0.05). Considering higher uptake of the powder particles by the daphnids, Fe-sericite composite beads seem to be a more appropriate and safer sorbent for arsenic removal in practical application. Based on Fe content, Fe-sericite composite beads had similar or higher maximum sorption capacities (71.19 and 56.11mgg −1 Fe for As(III) and As(V), respectively) than those of previously reported sorbents. Highlights Fe-sericite composite was an efficient sorbent for arsenic removal. Desorption of arsenic was insignificant to Daphnia magna toxicity. Fe-sericite composite beads seemed to be appropriate and safe in real application.
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