改性活性炭滤芯对饮用水中砷离子吸附性能的研究  

Study on the Adsorption Performance of Modified Activated Carbon Filter for Arsenic Removal in Drinking Water

作　　者：魏志钢[1] 蹇慧霞 张莉 刘月[1] 周志鑫 冯奕锦 WEI Zhigang;JIAN Huixia;ZHANG Li;LIU Yue;ZHOU Zhixin;FENG Yijing(School of Light Industry and Chemical Engineering Guangdong University of Technology,Guangzhou 510006,China)

机构地区：[1]广东工业大学轻工化工学院,广东广州510006

出　　处：《水处理技术》2023年第6期65-67,72,共4页Technology of Water Treatment

基　　金：增晔科技环保新材料前期调研与设计(607210573);改性压缩活性炭滤芯对无机砷离子的去除(212220167)。

摘　　要：探究了改性活性炭滤芯对饮用水中砷离子的吸附能力。利用溶胶-凝胶法制备TiO2溶胶并将其负载于活性炭粉末上,活性炭粉末与聚乙烯混合压制并烧结制备滤芯,测试其对饮用水中砷离子的吸附性能。采用动态吸附法,分别测试了进口流速、砷初始浓度、pH对吸附效果的影响。结果表明,流速从6 L/h升高到30 L/h时,三价砷离子去除率从95.8%降低到80.1%,五价砷离子去除率从96.3%降低到77.6%。初始砷浓度从200μg/L到350μg/L时,三价砷离子去除率从89.2%降低到78.9%,五价砷离子去除率从90.5%降低到89.3%。三价和五价砷离子分别在pH为9和4的条件下吸附效果最好。另外,Thomas模型能较好地描述改性活性炭滤芯对砷离子的动态吸附行为。改性活性炭滤芯相较于未改性的滤芯吸附效果显著提高,在流速为6 L/h,初始浓度为200μg/L时,砷离子出口浓度低于10μg/L,符合国家饮用水标准。In this paper,the adsorption capacity of a modified activated carbon filter for arsenic in drinking water was investigated.The TiO2 sol was prepared by the sol-gel method and loaded on activated carbon powder.The activated carbon powder was mixed with polyethylene,then pressed and sintered to prepare the filter,and its adsorption performance on arsenic in drinking water was tested.The effects of inlet flow rate,initial arsenic concentration,and pH values were tested using the dynamic adsorption method.The results showed that when the flow rate increased from 6 to 30 L/h,the removal of arsenite decreased from 95.8%to 80.1%,and the removal of arsenate decreased from 96.3%to 77.6%.When the initial arsenic concentration raised from 200 to 350μg/L,arsenite removal decreased from 89.2%to 78.9%,and arsenate removal decreased from 90.5%to 89.3%.The best adsorptions for arsenite and arsenate were at pH=9 and 4,respectively.In addition,the Thomas model could fit well with the dynamic adsorption behavior of a modified activated carbon filter for arsenic.Compared with the unmodified filter,the adsorption ability of the modified activated carbon filter was significantly improved.When the flow rate was 6 L/h and the initial concentration was 200μg/L,the outlet concentrations of arsenic were lower than 10μg/L,which was the national drinking water standard.

关 键 词：改性活性炭滤芯 除砷 pH的影响 吸附 饮用水处理 

分 类 号：TQ424.1[化学工程]