有机改性膨润土对废水中四环素的吸附研究  

Adsorption of tetracycline in wastewater by organic modified bentonite

作　　者：柴琴琴 杨平平 周恺 张小燕 刘建伟 CHAI Qinqin;YANG Pingping;ZHOU Kai;ZHANG Xiaoyan;LIU Jianwei(Xi’an Hantang Analysis and Testing Co.,Ltd.,Xi’an 710016,China;College of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]西安汉唐分析检测有限公司,陕西西安710016 [2]西安科技大学化学与化工学院,陕西西安710054

出　　处：《应用化工》2024年第7期1630-1634,共5页Applied Chemical Industry

基　　金：陕西省青年科技新星人才项目(2023KJXX-125)。

摘　　要：针对天然膨润土(Bt)对废水中的四环素去除效果不佳问题,采用十二烷基二甲基甜菜碱(BS-12)对Bt进行改性,制备出BS-12改性膨润土(BS-Bt)吸附材料,研究了BS-Bt和Bt对废水中四环素的吸附性能,并考察吸附剂的投加量、溶液pH、离子强度对吸附过程的影响。结果表明,Bt和BS-Bt吸附四环素的能力随吸附剂加入量的减小而增大;随着四环素废水溶液pH的增大而减小;随着离子强度的增强表现出缓慢减小的趋势。Bt和BS-Bt在1 h内快速完成对四环素的吸附,4 h达到吸附平衡,符合准二级动力学方程(R^(2)>0.996),Freundlich模型对吸附数据具有良好的非线性拟合性,吸附等温线均呈“L型”。经两性表面活性剂改性的膨润土对四环素的吸附性能明显高于原土,这使其成为四环素废水处理的潜在吸附剂。In response to the poor removal effect of tetracycline from wastewater by natural bentonite(Bt),BS-12 was used to modify Bt and prepare BS-12 modified bentonite(BS-Bt)adsorption material,studied the adsorption performance of BS-Bt and Bt on tetracycline in wastewater,and the dosage of adsorbent pH and ionic concentrations were discussed.The results show that the adsorption capacity of Bt and BS-Bt for tetracycline increases with the decrease of adsorbent addition amount;with the increase of pH;with the Ca^(2+)concentrations increasing,the adsorption capacity present slowly decreasing trend.The adsorption process of tetracycline by Bt and BS-Bt could be completed rapid adsorption within 1 h,and reached adsorption equilibrium within 4 h,it conforms to the quasi-second order dynamic equation(R^(2)>0.996).The Freundlich model has good nonlinear fitting ability for adsorption data,and adsorption isotherms are“L-type”.The adsorption capacity of organically-modified bentonite to tetracycline was significantly higher than that of bentonite,which made it a potential adsorbent for tetracycline wastewater treatment.

关 键 词：有机改性 膨润土 吸附 四环素 

分 类 号：TQ424.3[化学工程]