改性施氏矿物治理砷复合污染废水的研究  

Study on the Treatment of Roxarsone and As(V) Polluted Wastewater by Modified Schwertmannite

作　　者：臧淑艳[1] 蔚蓝 李波[1] 陈云声 刘秀明[2] ZANG Shu-yan;WEI Lan;LI Bo;CHENG Yun-sheng;LIU Xiu-ming(School of science,Shenyang University of Chemical Technology,Shenyang 110142,China;StateKey Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)

机构地区：[1]沈阳化工大学理学院,辽宁沈阳110142 [2]中国科学院地球化学研究所环境地球化学国家重点实验室,贵州贵阳550081

出　　处：《当代化工》2022年第7期1555-1560,共6页Contemporary Chemical Industry

基　　金：国家自然科学基金项目(项目编号:41773136);基础研究项目(项目编号:XXLJ2019007)。

摘　　要：通过对施氏矿物改性,使其具有较大比表面积和丰富的官能团,并且能够同时去除重金属和有机物。以改性施氏矿物为处理剂,以洛克沙胂和As(Ⅴ)作为有机砷与无机砷典型代表性砷复合污染物,探究砷复合污染废水治理。运用傅里叶红外光谱(FTIR)、X射线衍射(XRD)表征方法对比改性前后施氏矿物的变化,推测污染物质去除机理。同时,探究在不同条件下改性施氏矿物对吸附砷复合污染物的影响。结果表明:当洛克沙胂和As(Ⅴ)质量浓度分别为10 mg·L^(-1)和1 mg·L^(-1)、溶液pH为6.0、吸附剂投入量为0.6 g·L^(-1)、反应时间为6 h、温度为35℃时去除效果最好,去除率接近100%。该吸附过程符合二级动力学模型,以化学吸附为主。Modified schwertmannite has a large specific surface area and rich functional groups, and the heavy metal and organic matter can be simultaneously removed by the modified schwertmannite. Taking modified schwertmannite as treatment agent, roxarsone and AS(V) as organic arsenic and inorganic arsenic composite contaminants, arsenic composite pollution wastewater treatment was carried out. Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD) characterization methods were used to compare the changes of schwertmannite before and after modification, which confirmed that the modified schwertmannite had better adsorption effect. At the same time, the effect of modified schwertmannite on the adsorption of arsenic compound pollutants under different conditions was explored, and the optimal reaction conditions were found. The results showed that when the mass concentrations of roxarsone and As(V) were 10 mg·L^(-1) and 1 mg·L^(-1), respectively, the pH value of the solution was 6, the dosage of adsorbent was 1 g·L^(-1), the reaction time was 6 h, and the temperature was 35℃,the removal efficiency was close to 100%. The adsorption process conformed to the second-order kinetic model and was dominated by chemical reaction.

关 键 词：施氏矿物 ROX As(Ⅴ) 复合污染 动力学 

分 类 号：TQ013[化学工程]