文献类型：期刊文献

英文题名：Effect of aggregation behavior on microplastic removal by magnetic Fe3O4 nanoparticles

作者：Yan, Ruiqi[1];Lin, Sen[1];Jiang, Weinan[1];Yu, Xia[1];Zhang, Lei[1];Zhao, Wentao[2,3];Sui, Qian[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[2]Tongli Univ, Coll Environm Sci & Engn, State Key Lab Pollut Control & Resource Reuse, Shanghai 200092, Peoples R China;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2023

卷号：898

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20233114460148);WOS:【SCI-EXPANDED(收录号:WOS:001041552300001)】；

基金：This research was partly supported by the National Natural Science Foundation of China (22076045, 21777042) , the Science and Technology Commission of Shanghai Municipality's Yangfan Special Project (23YF1408400) , Shanghai Talent Development Funding (2020051) , Shanghai Youth Talent Support Program, the Open Research Fund of State Environmental Protection Key Laboratory of Ecological Effect and Risk Assessment of Chemicals (2022KFYB03) , and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Nano-scale microplastics; Zeta potential; Aggregation behavior; Magnetic removal

摘要：Magnetic nanotechnologies have been shown to be an efficient approach to the reduction of microplastic (MP) pollution in aquatic environments. However, uncertainties remain regarding the relationship between particle stability and MP removal under varying water conditions, hindering the practical application of magnetic nanotechnologies for MP removal. Herein, the influence of particle aggregation behavior on nano-scale MP removal by Fe3O4 nanoparticles (FNPs) was investigated, by monitoring dynamic light scattering parameters and analyzing the microstructures of particle aggregates. Results showed that 83.1 %-92.9 % of MPs could be removed by FNPs within 1 h, and MP removal exhibited a high degree of Pearson correlation (R = 0.95; P = 0.04) with particle aggregation behavior mediated by the FNPs dosage. Furthermore, pH-dependent electrostatic interactions significantly influenced particle aggregation behavior and the removal of MPs. Under pH <6.7 conditions, electrostatic attraction between electropositive FNPs and electronegative MPs led to charge neutralization-induced aggregation and efficient removal MP performance. Under increasingly saline conditions, compression of the electrical double layer enhanced the selfaggregation behavior of MPs, weakening the electrostatic repulsion between FNPs and MPs under alkaline conditions. Therefore, salinity improved the MP removal efficiency, especially under alkaline conditions, with MP removal increasing from 4.47 % to 55.1 % when the mass fraction of NaCl was increased from 0 % to 1 %. These findings further our understanding of the effect of aggregation behavior on MP removal by FNPs and highlight the potential for magnetic nanotechnology application in the removal of nano-scale MPs from aquatic environments, while also providing valuable insights for the design of FNP-based materials.