壳聚糖接枝聚丙烯酸/凹凸棒石复合材料对毒死蜱的吸附行为  

Adsorption performance of CTS-g-PAA/ATP composite on chlorpyrifos

作　　者：徐华[1] 温洪坚 林建达 周红军[1] 陈铧耀[1] 周新华[1] XU Hua;WEN Hongjian;LIN Jianda;ZHOU Hongjun;CHEN Huayao;ZHOU Xinhua(College of Chemistry and Chemical Engineering,Zhongkai College of Agriculture and Engineering,Key Laboratory of Agricultural Green Fine Chemicals of Guangdong Higher Education Institution,Guangzhou 510225,Guangdong,China)

机构地区：[1]仲恺农业工程学院化学化工学院广东省普通高校农用绿色精细化学品重点实验室

出　　处：《化工进展》2019年第7期3332-3340,共9页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(21576303);广东省科技计划(2015A020209197、 2015A020209185);广东省教育厅特色创新项目(2014KQNCX163)

摘　　要：以壳聚糖(chitosan,CTS)、丙烯酸(acrylic acid,AA)和凹凸棒石(attapulgite,ATP)为原料,利用分散聚合法制备壳聚糖接枝聚丙烯酸/凹凸棒石(CTS-g-PAA/ATP)复合吸附剂,以毒死蜱(chlorpyrifos,CPF)为模型农药,研究了复合吸附剂CTS-g-PAA/ATP在不同温度、时间和不同毒死蜱浓度下对毒死蜱的吸附性能,并对实验结果进行吸附热力学与动力学拟合分析。结果表明,CTS-g-PAA/ATP和HATP(酸化凹凸棒石)在24h和30℃下对毒死蜱的吸附量分别为7.42mg/g和18.95mg/g,复合材料的吸附能力提高了180%;拟合结果分析表明,吸附过程遵循Langmuir单分子层等温吸附(R^2≥0.97),在30℃、35℃、40℃下理论上最大吸附量分别为57.8mg/g、54.3mg/g、51.2mg/g;并与准二级动力学模型精准拟合(R^2≥0.97),化学吸附是吸附过程的主要控制因素。A composite adsorbent CTS-g-PAA/ATP was synthesized by the materials of chitosan (CTS),acrylic acid and attapulgite (ATP) with the method of dispersion polymerization.Using the chlorpyrifos (CPF) as a model pesticide to study the adsorption performance of the composite adsorbent at different temperature,time and different chlorpyrifos concentration was introduced,and the adsorption thermodynamics and kinetics analysis were carried out to fit the experimental results.The results showed that the adsorption capacities of CTS-g-PAA/ATP and HATP (acidified attapulgite) on chlorpyrifos at 24h and 30℃ were 7.42g/g and 18.95mg/g,respectively,and the adsorption capacity of the composite increased by 180%.The results of the isotherm fitting analysis showed that the adsorption process followed the Langmuir model with the monolayer isotherm adsorption (R^2≥0.97),and the theoretical maximum adsorption capacities were 57.8mg/g,54.3mg/g and 51.2mg/g at 30℃,35℃ and 40℃,respectively.With accurate fitting with the pseudo-second order kinetic model (R^2≥0.97),chemical adsorption was the main controlling factor of the adsorption process in kinetics.

关 键 词：壳聚糖 聚丙烯酸 凹凸棒石 毒死蜱 吸附 

分 类 号：TQ314[化学工程—高聚物工业]