Intrinsic metal ion dual-regulated fabrication of multifunctional nano-interfacial BiFeVO4/Fe-MOF for high photo-Fenton-like synergistic catalytic oxytetracycline removal
Zuxue Bai, Yawei Xie, Xuechun Wei, Liqin Zhou, Jingyu Bao, Rongshuo Tang, Yanxuan Wen, Zhongxing Zhao, Zhongxing Zhao, Jiguang Deng, Zhenxia Zhao, Zhenxia Zhao
Abstract
Great disparity in crystal size and incompatibility in crystal interface of catalysts lead to low catalytic activity, restricting its application for antibiotic degradation. Herein, a dual regulation strategy via intrinsic ion interpenetration was proposed to engineer multifunctional nano-interfacial BiFeVO 4 /NH 2 -MIL-88B(Fe-Bi) (BFV/NMFB) catalysts for efficient photo-Fenton-like catalytic degradation OTC . These multifunctional nano-interfaces (Fe-O-Bi) with abundant vacancy defects enhanced electrical conductivity , broadened light absorption and narrowed band gap. Furthermore, the strong interface bonds enhanced H 2 O 2 adsorption and activation, accelerated photogenerated carrier separation/transfer and promoted Fe 3+ /Fe 2+ redox activity. These properties gave an excellent synergistic effect of photo and Fenton-like catalysis (synergy factor up to 4.6) via changing photocurrent transfer pathway and interfacial adsorption-activation mechanism. Therefore, the designed BFV/NMFB exhibited superior photo-Fenton-like catalytic activity ( k a = 189 mol‧mg −1 ‧min −1 ), about 3.6–58 times higher than these of reported catalysts. The proposed strategy provided a promising method for the design of MOFs composition for application of antibiotic degradation.