Kim Jiwon, Lee Cheongho, Lee Seung Mok, Jung Jinho
Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea.
Department of Environmental Engineering, Catholic Kwandong University, Gangneung 25601, Republic of Korea.
Ecotoxicol Environ Saf. 2018 Jan;147:80-85. doi: 10.1016/j.ecoenv.2017.08.033. Epub 2017 Sep 14.
Batch sorption and leaching of arsenic (1-30mgL) 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 for As(III) and As(V), respectively) were higher than those of the corresponding beads (9.02 and 7.11mgg 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 Fe for As(III) and As(V), respectively) than those of previously reported sorbents.
本研究考察了铁云母复合粉末和颗粒对砷（1 - 30mg/L）的批量吸附和浸出情况。铁云母复合粉末由天然云母经铁改性制成，海藻酸钠用于将粉末制成颗粒。由于粉末具有更高的比表面积，铁云母复合粉末对As(III)和As(V)的最大吸附容量（分别为15.04和13.21mg/g）高于相应颗粒（As(III)和As(V)分别为9.02和7.11mg/g）。此外，铁云母复合颗粒中As(III)的浸出量（≤15.03%）高于相应粉末（≤5.71%）。然而，吸附了As(III)的铁云母复合颗粒对大型溞的急性毒性与相应粉末无显著差异（p > 0.05）。考虑到大型溞对粉末颗粒的摄取量更高，在实际应用中，铁云母复合颗粒似乎是一种更合适、更安全的砷去除吸附剂。基于铁含量，铁云母复合颗粒对As(III)和As(V)的最大吸附容量（分别为71.19和56.11mg/g Fe）与先前报道的吸附剂相似或更高。
