文献类型：期刊文献

英文题名：Dual-reaction-center engineering in Cu/CoFe2O4 spinel for pH-universal Fenton reaction toward efficient ofloxacin degradation

作者：Peng, Yixin[1];Qian, Luwen[1];Sun, Xianbo[1];Nghiem, Long D.[2];Pan, Fei[3];Ji, Jing[4];Liu, Yongdi[1];Cai, Zhengqing[1,5]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Ind Wastewater Detoxicat & Resou, Shanghai 200237, Peoples R China;[2]Univ Technol Sydney, Ctr Technol Water & Wastewater, Sch Civil & Environm Engn, Ultimo, NSW 2007, Australia;[3]Wuhan Text Univ, Sch Resources & Environm, Wuhan 430200, Peoples R China;[4]Beijing Univ Chem Technol, Coll Chem Engn, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China;[5]Shanghai Inst Pollut Control & Ecol Secur, Shanghai 200237, Peoples R China

年份：2026

卷号：527

外文期刊名：CHEMICAL ENGINEERING JOURNAL

收录：;EI(收录号：20255219789799);WOS:【SCI-EXPANDED(收录号:WOS:001650951200009)】；

基金：This study was financially supported by the National Natural Science Foundation of China (22176061, 41807340) , and Natural Science Foundation of Shanghai [21ZR1415600] .

语种：英文

外文关键词：Cu/Fe; Surface-bound center dot OH; pH-universal; Ofloxacin

摘要：This study introduces Cu into the CoFe2O4 structure via a one-step hydrothermal method, creating a polymetallic (Cu/CoFe2O4) catalyst with synergistic dual reaction centers. Material characterization reveals that Cu incorporation facilitates the formation and maintenance of low-valent Cu+ and Fe2+ species. Synergistic Cu+/Cu2+ and Co2+/Co3+ redox couples efficiently shuttle electrons, facilitating the rapid reduction of Fe3+ (the rate-limiting step) and boosting H2O2 activation efficiency across a wide pH range. The optimized Fenton system achieved complete ofloxacin (OFX) removal within 120 min and high mineralization under neutral conditions (pH 7), exhibiting a reaction rate 19 times higher than pristine CoFe2O4. The surface-bound center dot OH was identified as the primary reactive species (56 % contribution) and O2 center dot- as secondary contributors. During the reaction, the center dot OH concentration reached 411 mu M within the initial 5 min followed by slower accumulation, with the secondary reaction rate constant between center dot OH and OFX to be 1.55 x 1010 M-1 & sdot;s- 1. The O2 center dot- generation rate was 1.81 x 10-8 M & sdot;s- 1, and the secondary reaction rate constant between O2 center dot- and OFX was 1.08 x 107M- 1 & sdot;s- 1. The dominance of surface-bound center dot OH provides intrinsic tolerance to bulk solution pH fluctuations, explaining the system's high efficiency at neutrality. The material maintained over 95 % efficiency in continuous-flow pilot operation over 75 h, demonstrating exceptional potential for industrial implementation. Toxicity assessment via seed germination and theoretical calculation indicated reduced ecotoxicity of treated effluent. These findings highlight the material's broad pH adaptability, practical efficacy in complex water matrices, and potential for antibiotic wastewater remediation.