改性膨润土对水中全氟辛酸的吸附性能研究  

Study on the adsorption properties of organic bentonite for PFOA

作　　者：丁倩云 孙建强[1] 洪雷[1] DING Qian-yun;SUN Jian-qiang;HONG Lei(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,甘肃兰州730070

出　　处：《应用化工》2021年第11期2959-2962,共4页Applied Chemical Industry

基　　金：国家自然科学基金(21277065)。

摘　　要：以十六烷基三甲基溴化铵改性膨润土(CTAB-BENT)作为吸附剂,在温度288~313 K,初始浓度40 mg/L条件下,研究CTAB-BENT对全氟辛酸(PFOA)的吸附动力学和热力学规律,同时考察了溶液pH对吸附的影响。结果表明,PFOA在CTAB-BENT上的吸附过程符合伪二级动力学及Langmuir吸附等温模型,ΔH^(0)>0,ΔS^(0)>0,ΔG^(0)<0,表明PFOA在CTAB-BENT上吸附属于易自发进行的物理吸附过程。pH值介于3~9时,PFOA在CTAB-BENT上的吸附能力随着pH值的增大而降低。Cetyltrimethylammonium bromide modified bentonite(CTAB-BENT)was used as adsorbent.The adsorption kinetics and thermodynamics of perfluorooctanoic acid(PFOA)on CTAB-BENT were studied within an initial concentration range of 40 mg/L,an experimental temperature range of 288~313 K.The effect of pH on the adsorption was also investigated.Results show that the adsorption process of PFOA on the CTAB-BENT is in accordance with pseudo second order kinetics and Langmuir adsorption isothermal model.ΔH^(0)>0,ΔS^(0)>0 andΔG^(0)<0 indicate that the adsorption of PFOA on the CTAB-BENT is a spontaneous physical adsorption process.The adsorption capacity of PFOA on CTAB-BENT decreased with the increase of pH value when the pH value was 3 to 9.

关 键 词：全氟辛酸 有机膨润土 吸附 热力学 动力学 

分 类 号：TQ031.2[化学工程] TQ085.41