摘要
Peroxymonosulfate (PMS)-enhanced advanced oxidation processes are a promising technology for emerging micropollutant detoxification. In this work, the N-doped carbon dot (NCD)-decorated MIL-101(Fe)/g-C 3 N 4 (NMCN) heterojunction was fabricated through the hydrothermal method and then immobilized onto a PVDF membrane for visible-light-responsive photodegradation of enrofloxacin (ENR). NMCN nanocomposites exhibit a large specific surface area to offer reactive sites for PMS conversion. Meanwhile, the integration of NCD, MIL-101(Fe), and g-C 3 N 4 constitutes S-scheme heterojunction to significantly narrow down the band gap from 2.78 to 2.46 eV. Interestingly, NCD in NMCN nanocomposites serves as the electron mediator to accelerate electron transfer for PMS activation. After the activation with 0.125 mM PMS, the S-scheme NMCN-decorated photocatalytic membrane achieves a nearly complete ENR removal with a superior rate constant of 15.16 s −1 in a single-pass flow-through photoreactor because of the enhanced mass transfer among catalysts, PMS, and ENR. Various environmental conditions including catalyst property, water chemistry, and operation conditions were comprehensively elucidated, while SO 4 •- , e − , and 1 O 2 are primary reactive species. The catalytic mechanism and roles of each nanomaterial in the photodegradation after PMS activation were elucidated. Results highlight the superior photoactivity of NMCN-decorated photocatalytic membrane toward micropollutant removal, indicating its potential as the foundational platform of a PMS-activated photocatalytic membrane for water purification.