文献类型：期刊文献

中文题名：利用Fe_(3)O_(4)纳米颗粒磁分离去除水中小粒径微塑料

英文题名：Removal of small-sized microplastics from aqueous solution with Fe_(3)O_(4) nanoparticles by magnetic separation

作者：姜伟楠[1];隋倩[1];吕树光[1]

机构：[1]华东理工大学资源与环境工程学院,国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

年份：2021

卷号：41

期号：8

起止页码：3601

中文期刊名：中国环境科学

外文期刊名：China Environmental Science

收录：CSTPCD;;EI(收录号：20213610871955);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金资助面上项目(22076045,21777042)。

语种：中文

中文关键词：磁性纳米颗粒;微塑料;磁性分离;去除;聚苯乙烯

外文关键词：magnetic nanoparticles;microplastics;magnetic separation;removal;polystyrene

摘要：建立了微塑料(Microplastics, MPs)荧光定量分析方法,系统研究了Fe_(3)O_(4)纳米颗粒对水中聚苯乙烯MPs的磁性去除效果.结果表明,MPs浓度在本实验范围内(0.2~10.0mg/L)与荧光强度线性关系良好,相关系数均>0.9990,能准确测定不同粒径(100~1000nm)MPs的浓度.MPs初始浓度与Fe_(3)O_(4)纳米颗粒投加量对MPs去除效果具有影响.增加Fe_(3)O_(4)纳米颗粒的投加量能够有效提升水中MPs的去除率,当Fe_(3)O_(4)投加量为12mg/L时,去除率可达90.8%.在低Fe_(3)O_(4)投加量时,MPs去除率随着MPs初始浓度增加而显著增加,显著性水平为0.015;但在中、高Fe_(3)O_(4)投加量时,初始浓度对去除效果影响很小,显著性水平分别为0.073和0.060.Fe_(3)O_(4)纳米颗粒对MPs的附着过程能够在180min内趋于平衡,整个动力学可通过拟一级或拟二级模型进行拟合.
In this study,we developed a fluorescence quantitative analysis method to detect the concentration of Microplastics(MPs),and studied the removal of polystyrene MPs with Fe_(3)O_(4) nanoparticles by magnetic separation in water.Results showed that the concentration of MPs(0.2~10.0 mg/L)had a good linear relationship with fluorescence intensity and the correlation coefficients were all greater than 0.9990,indicating its feasibility to accurately determine MPs concentrations with different particle sizes(100~1000 nm).The initial concentration of MPs and the dose of Fe_(3)O_(4) nanoparticles had influence on the removal of MPs.Increasing the dose of Fe_(3)O_(4) nanoparticles could obviously improve the removal efficiency of MPs in water.When the dose of Fe_(3)O_(4) was 12 mg/L,the removal efficiency could reach 90.8%.When the dose of Fe_(3)O_(4) was low,the removal efficiency of MPs increased significantly with the increase of the initial concentration of MPs and the significance level was 0.015.However,when the dose of Fe_(3)O_(4) was medium or high,the initial concentration had little influence on the removal effect,and the significance level was 0.073 and 0.060,respectively.The adhesion process of Fe_(3)O_(4) nanoparticles to the MPs tended to equilibrium within 180 min,and the dynamics could be fitted using a quasi-first-order or quasi-second-order kinetic model.