磁化有机改性膨润土吸附水中全氟化合物的实验  

Adsorption and Removal of Perfluorinated Compoundsin Water by Magnetic Organic Modified Bentonite

作　　者：洪雷[1] 丁倩云 孙建强[1] 常青[1] HONG Lei;DING Qian-yun;SUN Jian-qiang;CHANG Qing(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,兰州730070

出　　处：《兰州交通大学学报》2021年第2期107-113,共7页Journal of Lanzhou Jiaotong University

基　　金：国家自然科学基金(21277065)。

摘　　要：制备磁化有机改性膨润土(Fe_3O_4-CTAB-BENT),基于批量实验研究Fe_3O_4-CTAB-BENT复合材料对水中全氟辛烷磺酸(PFOS)和全氟辛酸(PFOA)的吸附性能,并考察了pH值、腐殖酸(HA)和阴阳离子的影响.结果表明:Fe_3O_4-CTAB-BENT对水中的PFOS和PFOA具有良好的吸附能力,吸附过程更符合伪二阶动力学和Langmuir模型;酸性条件下更有利于PFOA及PFOS在Fe_3O_4-CTAB-BENT上的吸附,且PFOS吸附效果优于PFOA.当HA浓度<15 mg·L~(-1)时,其与PFOS、PFOA在Fe_3O_4-CTAB-BENT上的竞争吸附现象不明显.除Cl~-外其他无机共存离子NO~-_3、Na~+和Ca~(2+)会减弱PFOS和PFOA在Fe_3O_4-CTAB-BENT上的吸附.In this experiment,magnetic organic bentonite(Fe 3O 4-CTAB-BENT)was prepared,the adsorption properties of Fe 3O 4-CTAB-BENT on PFOS and PFOA in water were studied by batch experiments,and the effects of pH value,HA and ions were investigated.The results indicated that Fe 3O 4-CTAB-BENT had good adsorption properties for PFOS and PFOA in water,and the adsorption process was in accordance with pseudo second order kinetics and Langmuir model.Acidic conditions were more favorable for the adsorption of PFOA and PFOS on Fe 3O 4-CTAB-BENT,and the adsorption capacity of PFOS was higher than that of PFOA.When the concentration of HA was lower than 15 mg·L-1,the competitive adsorption of HA with PFOS and PFOA on Fe 3O 4-CTAB-BENT was not obvious.The adsorption capacity of PFOS and PFOA on Fe 3O 4-CTAB-BENT was weakened by inorganic co-existing ions such as NO-3,Na+and Ca 2+except for Cl-.

关 键 词：吸附 全氟辛烷磺酸 全氟辛酸 改性膨润土 

分 类 号：X703[环境科学与工程—环境工程]