覆铁石英砂对As的固化机理及影响因素  

Study on curing mechanisms and influence factors of arsenic by iron oxide coated sand

作　　者：邓天天 李晗晟 胡烨 施卓 吴烨 DENG Tiantian;LI Hansheng;HU Ye;SHI Zhuo;WU Ye(School of Environmental Studies, Henan University of Engineering, Zhengzhou 4 5 1 1 9 1 , China;Henan Engineering Laboratory of Pollution Control and Coal Chemical Resources Comprehensive Utilization, Henan University of Engineering y Zhengzhou 4 5 1 191, China)

机构地区：[1]河南工程学院资源与环境学院,河南郑州451191 [2]河南工程学院煤化工资源综合利用与污染治理河南省工程实验室,河南郑州451191

出　　处：《水资源保护》2017年第6期102-108,120,共8页Water Resources Protection

基　　金：河南工程学院博士基金(D2016013);河南省科技攻关项目(122102310444)

摘　　要：开展了覆铁石英砂(iron-oxide coated sand,IOCS)对水体中不同价态As的固化机理和影响因素的实验研究。结果表明:IOCS对As的吸附去除效率随IOCS表面Fe浓度的升高而增大,吸附量和固液分配系数均随反应时间的增加而增加,准二级反应模型能更好地描述As在IOCS表面的吸附行为。等温吸附实验结果表明:Freundlich的拟合效果较好,指数1/n随着IOCS表面铁浓度的增大而减小,说明经高浓度铁盐处理过的IOCS对于As具有更强的约束能力。此外,不同浓度的IOCS对As(Ⅲ)、As(Ⅴ)的吸附容量均随着反应温度的升高而升高,但温度对As(Ⅲ)的吸附效果的影响相对于As(Ⅴ)更显著。经各浓度铁盐处理过后的IOCS在不同pH值条件下吸附去除As(Ⅲ)、As(Ⅴ)的效果明显好于未经处理的砂质介质,但都呈现吸附量随pH的升高而下降的变化趋势。A batch of experimental research was conducted to analyze the curing mechanism and influencing factors of arsenic （As） from aqueous solutions by iron-oxide coated sand （ I O C S ） in this paper. T h e results s h o w e d that ： the removal efficiency of IOCS o n As increased with the rise of Fe concentration o n the surface of I O C S , adsorption and solid-liquid distribution coefficients increased with the increase of reaction time. The pseudo-second-order model can better describe the adsorption behavior of As on the surface of the IOCS. T h e isothermal adsorption test results showed that the fitting effects of Freundlich model were better and the index 1 /n decreased with the increasing with the Fe concentration on the surface of I O C S , w h i c h indicated that I O C S treated with high concentration of iron salt had stronger constraint for arsenic. In addition, different concentration of I O C S o n the adsorption capacity of As （ IH ） and As （ V ） increased with the rise of reaction temperature a n d , while the temperature had a more significant effect on As （ IH ） than on As （ V ） - The I O C S treated with different iron salt under different pH values had significantly better capacity of adsorption removal of As （ IH ） , As （ V ） than the untreated sandy media, but both showed the tendency that the adsorption capacity decreased with the increase of pH.

关 键 词：覆铁石英砂 AS 吸附机理 等温吸附实验 固化机理 

分 类 号：X523[环境科学与工程—环境工程]