可降解聚乙醇酸微塑料老化前后对盐酸四环素的吸附性能  

Adsorption behavior of tetracycline hydrochloride on biodegradable poly glycolic acid microplastics before and after aging

作　　者：贲睿 张峰[1] 崔佳丽[1] 陈启斌[1] 崔建国[1] BEN Rui;ZHANG Feng;CUI Jiali;CHEN Qibin;CUI Jianguo(College of Environmental Science and Engineering,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学环境科学与工程学院,晋中030600

出　　处：《环境工程学报》2023年第6期1818-1827,共10页Chinese Journal of Environmental Engineering

摘　　要：聚乙醇酸(poly glycolic acid,PGA)因其良好的降解性能会加快其老化过程,可能比传统塑料具有更大的环境风险,因此,评估PGA在环境迁移中对污染物的载体效应尤为重要。选用PGA颗粒微塑料(microplastics,MPs)为研究对象,盐酸四环素(tetracycline hydrochloride,TCH)为代表性污染物,探究老化过程对PGA吸附TCH行为的影响。结果表明:PGA在经过15 d H_(2)O_(2)和H_(2)SO_(4)老化后,表面均变得粗糙,比表面积由0.017 m^(2)·g^(-1)分别增至0.327 m^(2)·g^(-1)和0.467 m^(2)·g^(-1),官能团含量分别增加了1.89%和3.49%,接触角由83.19°分别降至81.58°和50.07°。吸附动力学均符合伪二级动力学模型,吸附等温线均符合Langmuir等温吸附模型。老化后PGA对TCH的吸附量均高于老化前,PGA-H_(2)O_(2)和PGA-H_(2)SO_(4)最大表观吸附量分别为0.617mg·g^(-1)和0.686 mg·g^(-1),是PGA老化前的1.05倍和1.17倍。The good degradation performance of Poly glycolic acid(PGA) can accelerate its aging process,which poses greater environmental risks than traditional plastics.Therefore,it is particularly important to evaluate the carrier effect of PGA on pollutants during its environmental migration.In this study,MP(Microplastic,MP) of PGA particles was selected as the research object,and Tetracycline hydrochloride(TCH)was selected as the representative pollutant to explore the influence of aging process on the adsorption behavior of PGA.The results showed that the surface of PGA became rough after 15 d H_(2)O_(2) or H_(2)SO_(4) aging treatment,and the specific surface areas increased from 0.017 m^(2)·g^(-1) to 0.327 with 0.467 m^(2)·g^(-1),the function groups increased by 1.89% and 3.49%,the contact angles decreased from 83.19° to 81.58° and 50.07°,respectively.The adsorption kinetics all fitted the pseudo-second-order kinetic model,and the adsorption isotherms all fitted the Langmuir isotherm model.The adsorption capacity of PGA to TCH after aging was higher than before.The maximum apparent adsorption capacities of PGA-H_(2)O_(2) and PGA-H_(2)SO_(4) could reach 0.617 and 0.686 mg·g^(-1),which was 1.05 and 1.17 times that of PGA before aging,respectively.

关 键 词：可降解微塑料 聚乙醇酸 吸附 盐酸四环素 

分 类 号：X703[环境科学与工程—环境工程]