涂铁石英砂去除水中As(Ⅴ)的实验研究  

Experimental study of removal of As(Ⅴ) from water with iron oxide-coated sand

作　　者：董一慧[1,2] 马腾[1,2] 周舒晗 张俊文[1,2] 

机构地区：[1]中国地质大学(武汉)环境学院,湖北武汉430074 [2]生物地质与环境地质国家重点实验室,湖北武汉430074

出　　处：《水文地质工程地质》2015年第2期126-131,共6页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金(40872157;41372252);国家重点基础研究发展规划(973项目)(2010CB428802);高等学校博士学科点专项科研基金(20110145110003);国家高技术研究发展计划(863计划)(2012AA062602);国家水体污染控制与治理科技重大专项(2012ZX07204-003-04)

摘　　要：选择来源广泛的石英砂作为负载体,以Fe Cl3为原料,用加热蒸发法合成制备简便且易于过滤的新型材料——涂铁石英砂(IOCS)。合成的IOCS表面的铁氧化物以赤铁矿为主,含铁量为11.73%,比表面积较改性前提高12.2倍。IOCS对As(V)的吸附动力学实验和等温吸附实验结果显示其吸附As(V)平衡时间为80 min,对As(V)的最大吸附量为1.22 mg/g。吸附符合Lagergren准二级动力学模型和Langmuir吸附等温模型,是表面吸附和共沉淀并存的过程。当初始As(V)浓度分别为0.1 mg/L、1 mg/L、5 mg/L,IOCS投加量与溶液中As(V)质量比分别为20000∶1和10000∶1时,在p H=6和p H=8.5两种条件下,IOCS对As(V)的平均去除率分别为86.10%和80.39%。In this study, iron oxide-coated sand （IOCS） was synthesized by heating vaporization and using extensive-source quartz sand as the carrier and FeCI3 as the material. IOCS mainly consists of hematite with iron contents of 11.73 % and specific surface area 12.2 times that of the original quartz sand. Results from adsorption kinetics and isothermal adsorption experiments show that the equilibrium time for arsenic adsorption on IOCS is 80 min and the maximum arsenic adsorption capacity is 1.22 mg/g. The adsorption conforms to the second-order kinetic model and the Langmuir isothermal adsorption model. Both the surface adsorption and the co-precipitation exist in the process. When the initial concentrations of arsenic in the solution are 0. 1, 1.0 and 5.0 mg/L, the ratio between masses of IOCS and As（V） in the solution is 20000：1 and 10000：1 and pH is 6 and 8.5, respectively, the average removal rate of arsenic is as high as 86.10% and 80.39%.

关 键 词：涂铁石英砂 砷 吸附 

分 类 号：P641.3[天文地球—地质矿产勘探]