电化学活化过一硫酸盐体系降解微塑料的研究  

Degradation of microplastics in electrochemical-peroxymonosulfate system

作　　者：胡靖斌 杨立宇 赵思渊 杨少霞[1] HU Jingbin;YANG Liyu;ZHAO Siyuan;YANG Shaoxia(School of Water Resources and Hydropower Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学水利与水电工程学院,北京102206

出　　处：《化工环保》2025年第2期202-210,共9页Environmental Protection of Chemical Industry

基　　金：国家自然科学基金联合基金项目(U22A20241)。

摘　　要：选择聚乙烯(PE)微塑料为目标污染物,开展了电化学活化过一硫酸盐(E-PMS)体系降解微塑料的研究。在微塑料质量浓度为100 mg/L、氧化剂PMS浓度为0.15 mmol/L、电流密度为40 mA/cm^(2)的条件下,反应6 h后,E-PMS体系对PE微塑料的降解率可达29.25%,远高于单独PMS体系(6.50%)和电化学体系(11.25%),PE微塑料粒径从100μm降至60μm,且表面生成了羟基、羰基等含氧官能团。在不同实际水体中,E-PMS体系均表现出好的降解性能。PO_(4)^(3-)、HCO_(3)^(-)、NO_(3)^(-)和腐殖酸对PE微塑料的降解有抑制作用,而Cl^(-)对降解有促进作用。电场和PMS的协同作用抑制了电解水析氧副反应,促进了PMS的活化,强化了活性氧物种的产生,加快了PE微塑料的降解,·OH和SO_(4)^(-)·是主要活性物种。With polyethylene(PE)microplastics as the target pollutant,thedegradation of microplastics in electrochemical-peroxymonosulfate(E-PMS)systemwas studied.Under the conditions of microplastic concentration of 100 mg/L,PMS oxidizing agentconcentration of 0.15 mmol/L,and current density of 40 mA/cm^(2),the degradation rate of microplasticsin the E-PMS system was 29.25%after 6 h reaction,which was significantly higher than that in single PMS system(6.5%)and electrochemical system(11.25%).The particle size of the PE microplastics was reduced from 100μm to 60μm,and oxygen-containing functional groups such as hydroxyl and carbonyl groups were formed on the surface.The E-PMS system showed good degradation performance in different actual water bodies.PO_(4)^(3-),HCO_(3)^(-),NO_(3)^(-),and humic acid inhibited the degradation of microplastics,while Cl^(-)promoted the degradation of microplastics.Moreover,the synergistic effect of the electric field and PMS restrained the side reaction of electrolytic water oxygen evolution,accelerated the activation of PMS,increased the production of reactive oxygen species,and promoted the degradation of PE microplastics.·OH and SO_(4)^(-)·were the main active species.

关 键 词：微塑料 聚乙烯 电化学降解 过一硫酸盐 

分 类 号：X703[环境科学与工程—环境工程]