Intrinsic metal ion dual-regulated fabrication of multifunctional nano-interfacial BiFeVO4/Fe-MOF for high photo-Fenton-like synergistic catalytic oxytetracycline removal

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. • Multifunctional interface of BiFeVO 4 /Fe-MOF is constructed by intrinsic Fe-Bi doping. • Interfacial enriched-O V changes photo-excitation pathway and boosts e - /h + separation. • Fe-O-Bi in BiFeVO 4 /Fe-MOF broadens light absorption and promotes Fe 3+ /Fe 2+ redox ability. • BiFeVO 4 /Fe-MOF boosts H 2 O 2 adsorption and conversion to radicals more than 20 times. • High photo-Fenton synergy of BiFeVO 4 /Fe-MOF shows ultra-high OTC catalytic degradation.