摘要
利用活性炭负载水合铁氧化物制备了复合吸附剂,并用于饮用水中As(Ⅴ)的去除.研究了活性炭种类、粒度、溶液pH值、Fe(Ⅲ)盐浓度和干扰离子等对As(Ⅴ)去除的影响.结果表明,煤质活性炭作为基质负载水合铁氧化物比椰壳炭和果壳炭具有更好的除砷效果.随着炭粒度降低,除砷效率显著增加.在pH3～9范围内,活性炭负载水合铁氧化物可有效吸附As(Ⅴ).F-,Cl-,SO42-的加入对As(Ⅴ)的去除效率基本无影响,而SiO32-和PO43-则明显抑制As(Ⅴ)的去除.Langmuir模型比Freundlich模型能更好地描述复合吸附剂对As(Ⅴ)的吸附平衡.动力学研究表明,As(Ⅴ)吸附反应可用二级速率方程描述.
An effective adsorbent for removal of arsenate from aqueous system was synthesized by loading ferdhydrite on activated carbon. The effects of carbon types, particle size, solution pH, Fe（Ⅲ） concentration and competing anions on removal rate of arsenate were studied. The results showed that coal-based activated carbon loaded with ferrihydrite had better arsenate removal efficiency than those of coconut- and husk-based activated carbon. The removal efficiency of As（Ⅴ） increased significantly with decreasing the particle size of activated carbon. Arsenate was effectively adsorbed by activated carbon loaded with ferrihydrite in the pH range of 3-9. The addition of F^-, Cl^- and SO4^2- showed negligible effect on arsenate removal, but PO4^3- and SiO3^2- had large effect. The pattern of adsorption of arsenate ion with composite adsorbent better matched with Langmuir model than Freundlich model. The adsorption reaction between arsenate and the binding surfaces could be described by a second order rate equation.
出处
《过程工程学报》
CAS
CSCD
北大核心
2009年第2期250-256,共7页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:40773076)
中国科学院“百人计划”基金资助项目(编号:40673079)
