CTAB改性硅藻土对废水中Cr(Ⅵ)的吸附特性研究  

Adsorption of Cr(Ⅵ) in Wastewater by CTAB Modified Diatomite

作　　者：郭绍英 苏耀东 肖艳春[3] 陈芳 郑育毅[4] 林皓 饶瑞晔 GUO Shao-ying;SU Yao-dong;Xiao Yan-chun;CHEN Fang;ZHENG Yu-yi;LIN Hao;RAO Rui-ye(College of Ecology and Resource Engineering of Wuyi University,Wuyishan 354300,China;Fujian Provincial Key Lab of Coastal Basin Environment,Fujian Polytechnic Normal University,Fuqing 350300,China;Institute of Agricultural Engineering Technology,Fujian Academy of Agricultural Science,Fuzhou 350003,China;College of Environmental Scienceand Engineering,Fujian Normal University,Fuzhou 350007,China)

机构地区：[1]武夷学院生态与资源工程学院,福建武夷山354300 [2]福建技术师范学院近海流域环境测控治理福建省高校重点实验室,福建福清350300 [3]福建省农业科学院农业工程技术研究所,福建福州350003 [4]福建师范大学环境科学与工程学院,福建福州350007

出　　处：《宜春学院学报》2021年第9期5-10,101,共7页Journal of Yichun University

基　　金：国家自然科学基金项目(项目编号:51406141);福建省自然科学基金项目(项目编号:2020J01411);福建省教育厅中青年科研项目(项目编号:JAT190773);近海流域环境测控治理福建省高校重点实验室开放基金项目(项目编号:S1-KF1901);福建省高校产学合作项目(项目编号:2018Y4011);武夷学院校科研基金项目(项目编号:XD201703)。

摘　　要：以十六烷基三甲基溴化铵(CTAB)为改性剂,对硅藻土进行有机活化改性,对比硅藻土改性前后对六价铬的吸附效果,考察改性硅藻土的投加量、溶液pH值、温度和吸附时间对其吸附Cr(VI)效果的影响,并探究其吸附热力学和动力学过程。结果表明硅藻土经CTAB改性后,对Cr(VI)的吸附率由20.8%提高到97.8%。pH值对CTAB改性硅藻土吸附Cr(VI)影响显著,在投加量为10 g·L^(-1),pH=3,溶液温度为40℃,吸附时间40 min,对Cr(VI)吸附率可达98.8%。CTAB改性硅藻土吸附Cr(VI)为吸热反应,吸附过程更符合Freundlich模型和准二级动力学模型。The diatomite was organic-activation modified by using cetyltrimethylammonium bromide(CTAB)as a modifier.The adsorption effect of diatomite before and after modification was compared.The factors,such as dosing amount,solution pH value,temperature and adsorption time that affect adsorption of Cr(Ⅵ)were studied,and its adsorption thermodynamics and kinetics were also explored.The results showed that the removal rate of Cr(VI)increased from 20.8%to 97.8%after CTAB modification.The pH value had a significant effect on the adsorption of Cr(VI)by CTAB modified diatomite.When the dosage was 10g·L^(-1),pH value was 3,the solution temperature was 40℃,and the adsorption time was 40 min,the removal rate of Cr(VI)reached to the highest of 98.8%.The adsorption of Cr(VI)by CTAB modified diatomite was an endothermic reaction,and the adsorption process was more consistent with Freundlich model and quasi-second-order kinetic model.

关 键 词：硅藻土 改性 吸附 六价铬 吸附模型 废水处理 

分 类 号：X703.1[环境科学与工程—环境工程]