摘要
近年来,微塑料(microplastics,MPs)作为一类新型污染物,广泛存在于水环境中而备受关注.与典型微塑料(PVC、PP、PE和PS)相比,轮胎磨损微粒(tire wear particles,TWP)在组成成分、添加剂种类和理化特性上存在显著差异.为深入比较TWP与典型MPs对有机污染物吸附-解吸行为的不同.以TWP和PVC微粒为目标MPs,土霉素(OTC)和磺胺甲唑(SMZ)为目标污染物,研究了TWP及PVC微粒老化前后对有机污染物的吸附-解吸特性,这对正确认识MPs潜在的水环境生态风险具有重要意义.结果表明,TWP及PVC在紫外线老化过程中,均表现为颗粒表面出现裂纹、凹坑和凸起,比表面积增大,含氧官能团强度增加,亲水性增强等现象.老化前后TWP及PVC的吸附模式均表现为表面吸附和液膜扩散两个阶段,其中TWP对Freundlich模型的拟合性较好,属于多层吸附;而PVC对Langmuir模型的拟合性较好,属于单层吸附.TWP对SMZ和OTC的载体能力均强于PVC,其中新制TWP与PVC对OTC的最大吸附量分别可达到5.14 mg·g^(-1)和1.38 mg·g^(-1);而老化后TWP和PVC对OTC的最大吸附量分别增加至5.82 mg·g^(-1)和2.13 mg·g^(-1),要大于老化前.解吸实验中,老化后TWP及PVC对抗生素的解吸量均高于老化前,而解吸率却随之降低.在同种解吸液中,老化前后TWP对抗生素的解吸量均高于PVC.而在模拟肠液环境下老化前后TWP及PVC对抗生素的解吸量均要高于在超纯水环境下.
In recent years,microplastics(MPs),a new type of pollutant,have been widely dispersed in aquatic ecosystems.Compared with typical MPs(PVC,PP,PE,and PS),tire wear particles(TWP)exhibit significant differences in composition,additives,and characteristics.In this study,the adsorption and desorption of organic pollutants were compared between the typical MPs and TWP.With TWP and polyvinyl chloride(PVC)particles as adsorbents,oxytetracycline(OTC)and sulfamethoxazole(SMZ)as adsorbates,the adsorption and desorption of organic pollutants by TWP and PVC particles before and after aging were studied.Correctly understanding the behavior of MPs in an aquatic environment is of great significance.The results indicated that during the UV aging process,both TWP and PVC exhibited cracks,pits,and bulges on the particle surface,increased specific surface areas,increased strength of oxygen-containing functional groups,and enhanced hydrophilicity.The adsorption modes of TWP and PVC before and after aging were in two stages:surface adsorption and liquid film diffusion.TWP has a better fit for the Freundlich model,belonging to multi-layer adsorption,while PVC has a better fit for the Langmuir model,belonging to monolayer adsorption.The carrier effect of TWP on antibiotics was better than that of PVC,with the adsorption capacity of OTC on virgin TWP and PVC reaching 5.14 mg·g^(-1)and 1.38 mg·g^(-1),respectively.Additionally,the adsorption capacity of OTC on the aged TWP and PVC reached 5.82 mg·g^(-1)and 2.13 mg·g^(-1),respectively,which was better than with the virgin samples.The desorption capacity of aged TWP and PVC for antibiotics was better than the virgin materials,while the desorption rate was lower.In the same desorption solution,the desorption effect of TWP on antibiotics before and after ageing was better than that of PVC.The desorption effect of TWP and PVC on antibiotics in a simulated intestinal fluid environment was significantly better than that in an ultra-pure water environment.
作者
范秀磊
邹晔锋
刘加强
李莹
刘强
侯俊
FAN Xiu-lei;ZOU Ye-feng;LIU Jia-qiang;LI Ying;LIU Qiang;HOU Jun(College of Environmental Engineering,Xuzhou University of Technology,Xuzhou 221018,China;Key Laboratory of Industrial Pollution Control and Resource Reuse of Jiangsu Province,Xuzhou 221018,China;School of Environment and Spatial Informatics,China University of Mining and Technology,Xuzhou 221116,China;College of Environment,Hohai University,Nanjing 210098,China;Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes,Ministry of Education,Nanjing 210098,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2021年第4期1901-1912,共12页
Environmental Science
基金
国家自然科学基金项目(52000153)
江苏省高校自然科学基金项目(19KJB610026)
徐州市重点研发计划项目(KC20163,KC19105)
中央高校基本科研业务费项目(B200204033)。
作者简介
范秀磊(1989-),男,博士,讲师,主要研究方向为新兴污染物的环境风险,E-mail:xlfan@xzit.edu.cn;通信作者:刘加强,E-mail:liujiaqiangsdjz@126.com。
