自然环境老化聚氯乙烯和橡胶微粒对邻苯二甲酸酯类塑化剂的吸附解吸行为  

Adsorption and Desorption Behavior of PAEs Plasticizer on PVC and Rubber Particles After Natural Environment Aging

作　　者：朱思甫 刘建超[1] 陆光华[1] ZHU Si-fu;LIU Jian-chao;LU Guang-hua(Key Laboratory for Integrated Regulation and Resources Development on Shallow Lakes,Ministry of Education,College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学环境学院,浅水湖泊综合治理与资源开发教育部重点实验室,南京210098

出　　处：《环境科学》2024年第8期4946-4955,共10页Environmental Science

基　　金：国家自然科学基金项目(521709063);江苏省自然科学基金项目(BK20221505);中央高校基本科研业务费专项(B230201058)。

摘　　要：水环境中微塑料(MPs)与塑化剂共存形成复合污染,但在自然条件下MPs与塑化剂吸附解吸行为机制尚不清楚.以聚氯乙烯(PVC)和橡胶为目标MPs,表征其在大气暴露和湖泊沉积掩埋环境下老化1a后的形貌特征变化,探究MPs老化前后对共存邻苯二甲酸酯(PAEs)类塑化剂的吸附和解吸行为.结果表明,MPs在大气环境暴露和沉积环境掩埋后表面更加粗糙,表现出多孔聚合物的特征,在大气环境下PVC和橡胶羰基指数(CI)分别增加了62.2%和321.2%,而沉积环境分别增加了51.1%和223.1%,大气环境暴露能够加速MPs的老化过程.PAEs通过疏水作用吸附在MPs表面,且吸附量与其疏水特性显著正相关.老化后PVC对PAEs的吸附容量及吸附速率受到抑制.老化促进橡胶对强疏水性PAEs类塑化剂的吸附,抑制了其对弱疏水性PAEs的吸附.环境老化过程降低橡胶对强疏水性PAEs的解吸量,增强橡胶对弱疏水性PAEs的吸附可逆性,提高了PVC对PAEs的解吸率.Microplastics(MPs)coexist with plasticizers in the aqueous environment to form composite pollution,but the adsorption and desorption behaviors of MPs and plasticizers under natural conditions are unknown.Polyvinyl chloride(PVC)and rubber were used as the target MPs to characterize the changes in their morphological features after aging for one anniversary in atmospheric exposure and lake sedimentary burial environments and to investigate the adsorption and desorption behavior of the MPs to the coexisting phthalate esters(PAEs)plasticizer before and after aging.The results showed that the surface of MPs was rougher after exposure to the atmospheric environment and burial in a depositional environment,showing the characteristics of porous polymers.The carbonyl index(CI)of PVC and rubber increased by 62.2%and 321.2%,respectively,in the atmospheric environment and increased by 51.1%and 223.1%,respectively,in the depositional environment.The atmospheric exposure was capable of accelerating the aging process of MPs.PAEs were adsorbed on the surface of MPs through hydrophobic interaction,and the amount of adsorption was significantly and positively correlated with their hydrophobic properties.The adsorption capacity and adsorption rate of PVC on PAEs were inhibited after aging.Aging promoted the adsorption of rubber on strongly hydrophobic PAEs plasticizers and inhibited the adsorption of weakly hydrophobic PAEs.The environmental aging process reduced the desorption of strongly hydrophobic PAEs from rubber,enhanced the reversibility of rubber adsorption of weakly hydrophobic PAEs,and increased the desorption rate of PAEs from PVC.

关 键 词：聚氯乙烯(PVC) 邻苯二甲酸酯(PAEs) 橡胶 老化 吸附 解吸 

分 类 号：X131[环境科学与工程—环境科学]