Chemical and toxicological assessment of arsenic sorption onto Fe-sericite composite powder and beads

• Published in: Ecotoxicology and environmental safety 2018-01, Vol.147, p.80-85
• Main Authors: Kim, Jiwon, Lee, Cheongho, Lee, Seung Mok, Lalhmunsiama, Jung, Jinho
• Format: Article
• Language: English
• Subjects: Acute toxicity; Adsorption; Alginates - chemistry; Animals; Arsenates - analysis; Arsenates - toxicity; Arsenic; Arsenites - analysis; Arsenites - toxicity; Daphnia - drug effects; Glucuronic Acid - chemistry; Hexuronic Acids - chemistry; Iron - chemistry; Models, Theoretical; Particle Size; Powders; Sericite; Silicon Dioxide - chemistry; Sorbent; Surface Properties; Toxicity Tests, Acute; Water Pollutants, Chemical - analysis; Water Pollutants, Chemical - toxicity; Water Purification - methods
• ISSN: 0147-6513; 1090-2414
• DOI: 10.1016/j.ecoenv.2017.08.033

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. •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.