微塑料对水体中痕量砷、铅的吸附  

Study on the adsorption of trace arsenic and plumbum ion by microplastics

作　　者：周瑛[1,2] 徐博凡 王萍亚 吴益春 赵巧灵 ZHOU Ying;XU Bofan;WANG Pingya;WU Yichun;ZHAO Qiaoling(College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China;Research Center of Analysis and Measurement, Zhejiang University of Technology, Hangzhou 310014, China;Zhoushan Institute for Food and Drug Control, Zhoushan 316021, China)

机构地区：[1]浙江工业大学化学工程学院,浙江杭州310014 [2]浙江工业大学分析测试中心,浙江杭州310014 [3]舟山市食品药品检验检测研究院,浙江舟山316021

出　　处：《浙江工业大学学报》2019年第6期648-653,共6页Journal of Zhejiang University of Technology

基　　金：浙江省食药监管系统科技计划项目(SP201717);浙江省基金公益研究计划项目(LGF18B070003)

摘　　要：微塑料是一种新型全球性污染物,易迁移、分布广,能吸附环境中的污染物并通过生物摄食进入食物链。目前微塑料对重金属的吸附尚未得到重视,对其吸附行为的研究大多集中于有机污染物。以聚苯乙烯为吸附剂,考察其对As,Pb的吸附能力,发现pH分别为6和8时对As和Pb的吸附效果最好,小粒径的聚苯乙烯更容易吸附金属离子,且超声能使其疏水性减弱,易于分散在水体中。动力学和热力学研究发现:聚苯乙烯对重金属的吸附符合二级动力学模型和Langumuir吸附等温模型,过程为单层吸附,并以化学吸附为主,热力学参数表明该吸附是一个自发的过程,温度升高有利于反应进行。Microplastics as new global pollutants have easy migration and wide distribution and they can adsorb environmental pollutants and enter food chains via food consumption. However, little attention is paid to investigate the adsorption of heavy metal ions by microplastics. In this work, the adsorption capacity of polystyrene to trace heavy metal ions in water has been studied and the results showed that the adsorption behavior could be affected by the adsorption time, pH, particle size, hydrophobicity and temperature and other factors. The adsorption of As and Pb ions reached the best when pH was 6 and 8, respectively. In addition, polystyrene with smaller particle sizes adsorb metal ions more effectively, and sonication of the polystyrene particles could reduce their hydrophobicity, making them more easily disperse in water. Dynamic and thermodynamic studies found that the adsorption of heavy metal ions by polystyrene corresponded to Langmuir adsorption isotherm model with second-order kinetics. The adsorption was monolayer adsorption and mainly based on chemical adsorption. Thermodynamic parameters indicated that the adsorption process was spontaneous and increase in temperature would benefit the adsorption due to its endothermic feature.

关 键 词：微塑料 吸附 痕量重金属 动力学 热力学 

分 类 号：X50[环境科学与工程—环境工程]