文献类型：期刊文献

英文题名：Removal of polystyrene nanoplastic beads using gravity-driven membrane filtration: Mechanisms and effects of water matrices

作者：Wan, Hongyi[1];Shi, Ke[1];Yi, Zhiyuan[1];Ding, Peng[1];Zhuang, Linzhou[1];Mills, Rollie[2];Bhattacharyya, Dibakar[2];Xu, Zhi[1,3]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[2]Univ Kentucky, Dept Chem & Mat Engn, Lexington, KY 40506 USA;[3]East China Univ Sci & Technol, Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：450

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20223412593152);WOS:【SCI-EXPANDED(收录号:WOS:000842991000001)】；

基金：This work was supported by China Postdoctoral Science Foundation [2020M681204] ; the National Natural Science Foundation of China [21908054 & 22075076] ; and NIEHS-SRP grant [P42ES007380] .

语种：英文

外文关键词：Nanoplastics removal; Nanofibrous membranes; Electrospun; Gravity-driven; Membrane fouling

摘要：Nanoplastics (NPs) are emerging water contaminants and the smaller particle size of NPs further hinders the remediation in the aspects of energy consumption and removal efficiency. Due to the loose structure and tunable functionalities, nanofibrous membranes, with ultrathin fibers (73.3 +/- 31.9 nm), were developed for NPs removal in a gravity-driven application. With an ultralow delta P-0 of 353 Pa, greater than92 % of model polystyrene NPs (average size from 107 to 1450 nm) were removed at an average water flux of 109 Lm(-2)h(-1). With advanced material characterization, the removal mechanisms were determined as: (1) size-exclusive membrane interception, which dominates the removal when d(NPs) > d(pores); and (2) membrane adsorption of smaller NPs via electrostatic and hydrophobic interactions. The distinct removal mechanisms trigger different long-term performances on removal and water flux. Complex water matrices were also evaluated, where acidic condition and anionic surfactant were observed to hinder the removal. In addition, the nanofibrous membranes showed resistance towards inorganic scaling whereas organic foulants decreased the water flux by 15.6 % after 40 consecutive filtration runs. The fouled membranes can be regenerated in mild conditions with 5 % ethanol. Overall, nanofibrous membranes are effective in NPs removal with the high-removal efficiency, low-fouling tendency, and ease of regeneration.