壳聚糖对四环素差向异构体的吸附差异研究  

Study on adsorption difference of tetracycline epimers on chitosan

作　　者：张冉 章耀鹏 陈杨[2] 沈忱思[1] ZHANG Ran;ZHANG Yaopeng;CHEN Yang;SHEN Chensi(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;College of Science and Technology,Ningbo University,Cixi 315302,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]宁波大学科学技术学院,浙江慈溪315302

出　　处：《化工环保》2022年第3期303-309,共7页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金项目(21777023)。

摘　　要：以壳聚糖为吸附剂,考察了其对四环素(TC)和差向四环素(ETC)的吸附去除效果,并对吸附影响因素和机理进行了探讨。实验结果表明:壳聚糖对ETC的吸附去除率优于TC,尤其在短时间内更为明显;吸附pH为6.03时,吸附去除效果最佳;壳聚糖对TC和ETC的吸附去除率与污染物初始浓度呈现负相关,且随壳聚糖投加量的增大而增加。壳聚糖对TC和ETC的吸附过程满足准二级动力学方程,且符合Langmuir模型。FTIR、XPS和EEM表征结果显示,壳聚糖结构中的一级羟基和质子化的氨基可能通过氢键或静电作用力与TC和ETC结合,且壳聚糖的螺旋沟槽与ETC具有较强的结合能力,可能是壳聚糖对ETC具有更好吸附性能的主要原因。The effect of chitosan,which was used as an adsorbent for adsorption and removal of tetracycline(TC)and 4-epi-tetracycline(ETC),was investigated,and the influencing factors and mechanism were discussed.The experimental results show that:The removal rate of ETC by chitosan is better than that of TC,especially in a short time;When the adsorption pH is 6.03,the adsorption removal effect is the best;The removal rate of TC and ETC by chitosan is negatively correlated with the initial concentration of pollutants,and increased with the increase of chitosan amount.The adsorption processes of TC and ETC on chitosan meet the quasi-second-order kinetic equation and the Langmuir model.The FTIR,XPS and EEM characterization results show that the primary hydroxyl group and proton-amino group in chitosan may bind to TC and ETC through hydrogen bond or electrostatic force,in addition,the spiral groove of chitosan has a strong binding ability with ETC,which may be the main reason for the better ETC adsorption on chitosan.

关 键 词：四环素 差向异构体 壳聚糖 吸附 

分 类 号：X832[环境科学与工程—环境工程]