TY - JOUR
T1 - Magnetic confinement-enabled membrane reactor for enhanced removal of wide-spectrum contaminants in water
T2 - Proof of concept, synergistic decontamination mechanisms, and sustained treatment performance
AU - Zhong, Delai
AU - Wu, Yuchen
AU - Lv, Leiyi
AU - Yang, Xue
AU - Lv, Yiliang
AU - Jiang, Yi
N1 - Funding Information:
This work was partially supported by Hong Kong Research Grants Council's Early Career Award (No. 25209819 ) and Theme-based Research Scheme (No. T21–711/16-R ); Research Institute for Sustainable Urban Development, The Hong Kong Polytechnic University (No. 1-BBWG ); and Guangdong-Hong Kong-Macau Joint Laboratory for Environmental Pollution and Control ( ZGBX ). D.Z. would like to thank financial support from The Hong Kong Polytechnic University Centrally Funded Postdoctoral Fellow Scheme (No. 1-YXA9 ). We also appreciate Dr. Mingjie Huang at University of Science and Technology of China for EPR measurements and valuable comments.
Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/3/1
Y1 - 2023/3/1
N2 - Membrane chemical reactors (MCRs) have demonstrated a great potential for simultaneous removal of wide-spectrum pollutants in advanced water treatment. However, current catalyst (re)loading and catalytic reactivity limitations obstruct their practical applications. Herein, as a proof-of-concept, we report a hollow fiber membrane chemical reactor (HF-MCR) with high and sustainable catalytic reactivity, enabled by novel magnetic confinement engineering of the catalysts. Namely, the zerovalent iron (ZVI) nanocatalysts were spatially dispersed and confined to nearly parallel magnetic induction lines, forming forest-like microwire arrays in the membrane lumen. Such arrays exhibited ultrahigh hydrodynamic stability. The HF-MCR integrated sequential membrane separation and Fenton-like catalysis, thus being capable of high and synergistic wide-spectrum decontamination. The membrane separation process completely removed large nanoplastics (NPs) via size exclusion, and thus the subsequent Fenton-like catalysis process enhanced removal efficiency of otherwise permeated bisphenol A (BPA) and phosphate (P) by in situ generated reactive oxygen species (primarily 1O2) and iron (oxyhydr)oxides, respectively. Furthermore, highly dispersed ZVI arrays and their continuous surface depassivation driven by magnetic gradient and hydrodynamic forces conferred abundant accessible catalytic sites (i.e., Fe0 and FeII) to stimulate Fenton-like catalysis. The consequent enhancement of BPA and P removal kinetics was 3–765 and 49–492 folds those in conventional (flow-through or batch) systems, respectively. Periodic ZVI reloading ensured sustained decontamination performance of the HF-MCR. This is the first demonstration of the magnetic confinement engineering that enables efficient and unlimited catalyst (re)loading and sustainable catalytic reactivity in the MCR for water treatment, which is beyond the reach of current approaches.
AB - Membrane chemical reactors (MCRs) have demonstrated a great potential for simultaneous removal of wide-spectrum pollutants in advanced water treatment. However, current catalyst (re)loading and catalytic reactivity limitations obstruct their practical applications. Herein, as a proof-of-concept, we report a hollow fiber membrane chemical reactor (HF-MCR) with high and sustainable catalytic reactivity, enabled by novel magnetic confinement engineering of the catalysts. Namely, the zerovalent iron (ZVI) nanocatalysts were spatially dispersed and confined to nearly parallel magnetic induction lines, forming forest-like microwire arrays in the membrane lumen. Such arrays exhibited ultrahigh hydrodynamic stability. The HF-MCR integrated sequential membrane separation and Fenton-like catalysis, thus being capable of high and synergistic wide-spectrum decontamination. The membrane separation process completely removed large nanoplastics (NPs) via size exclusion, and thus the subsequent Fenton-like catalysis process enhanced removal efficiency of otherwise permeated bisphenol A (BPA) and phosphate (P) by in situ generated reactive oxygen species (primarily 1O2) and iron (oxyhydr)oxides, respectively. Furthermore, highly dispersed ZVI arrays and their continuous surface depassivation driven by magnetic gradient and hydrodynamic forces conferred abundant accessible catalytic sites (i.e., Fe0 and FeII) to stimulate Fenton-like catalysis. The consequent enhancement of BPA and P removal kinetics was 3–765 and 49–492 folds those in conventional (flow-through or batch) systems, respectively. Periodic ZVI reloading ensured sustained decontamination performance of the HF-MCR. This is the first demonstration of the magnetic confinement engineering that enables efficient and unlimited catalyst (re)loading and sustainable catalytic reactivity in the MCR for water treatment, which is beyond the reach of current approaches.
KW - Magnetic confinement engineering
KW - Membrane chemical reactor
KW - Sustainable reactivity
KW - Water treatment
KW - Wide-spectrum contaminants
UR - http://www.scopus.com/inward/record.url?scp=85146581415&partnerID=8YFLogxK
U2 - 10.1016/j.watres.2023.119603
DO - 10.1016/j.watres.2023.119603
M3 - Journal article
C2 - 36680822
AN - SCOPUS:85146581415
SN - 0043-1354
VL - 231
JO - Water Research
JF - Water Research
M1 - 119603
ER -