文献类型：期刊文献

英文题名：Polyamide microplastics as better environmental vectors of Cr(VI) in comparison to polyethylene and polypropylene microplastics

作者：Shao, Xuechun[1];Zhang, Qi[1];Liang, Weiyu[1];Gong, Kailin[1];Fu, Mengru[1];Saif, Sadia[2];Peng, Cheng[1,3];Zhang, Wei[1,3]

机构：[1]East China Univ Sci & Technol, Sch Resource & Environm Engn, State Environm Protect Key Lab Environm Risk Asses, Shanghai 200237, Peoples R China;[2]Kinnaird Coll Women, Dept Environm Sci, Lahore 54000, Pakistan;[3]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200092, Peoples R China

年份：2023

卷号：186

外文期刊名：MARINE POLLUTION BULLETIN

收录：;EI(收录号：20225113272156);WOS:【SCI-EXPANDED(收录号:WOS:000911057100001)】；

基金：Acknowledgements This study was supported by National Key Research and Develop-ment Program of China (2022YFC3902503) and National Natural Sci-ence Foundation of China (42177395, 41807461, and 41877124) .

语种：英文

外文关键词：Microplastics; Aquatic environment; Chromium ions; Adsorption mechanisms; Desorption behavior

摘要：The adsorption, desorption, and their influence factors of Cr(VI) by microplastics (MPs) in the solution was investigated in this study. The results demonstrated that UV aging promoted adsorption, while the increase of salinity and natural organic matter (NOM) inhibited adsorption. The particle size affected the total Cr(VI) active adsorption sites on MPs, while the pH changed the electrostatic force. The Cr(VI) adsorption by MPs conformed to the pseudo-first and pseudo-second order kinetic models, and was monolayer and inhomogeneous. SEM-EDS, XPS and ATR-FTIR analyses demonstrated that the physical adsorption dominated the adsorption process. Especially, the highest adsorption capacity of Cr(VI) by polyamide (PA) MPs was attributed to their hydrophilic amide groups. However, Cr(VI) was only released from PA MPs, of which desorption rate followed the sequence of seawater (79.5 %) > fresh water (66.6 %) > deionized water (34.8 %). Thus, PA MPs might be non-negligible environmental vectors for the transport of Cr(VI).