Full-spectrum broad-spectrum degradation of antibiotics by BiVO4@BiOCl crystal plane S-type and Z-type heterojunctions

Abstract

Based on the poor full-spectrum broad-spectrum catalytic activity of the exposed crystal faces of BiVO4, a photo-deposited crystal plane selectively induce method was used to nucleate the strong reduction-capable BiOCl on BiVO4 (010) crystal planes in the heterogeneous phase and the OVs-BiOCl on BiVO4 (110) crystal planes in the homogeneous phase. The core–shell BiVO4@BiOCl crystal plane S-type and Z-type heterojunction photocatalysts were prepared. Under the synergistic effects of the surface heterojunction built-in electric field, the interfacial electrostatic built-in electric field, the inter-heterojunction polarization charge transfer and the Localized Surface Plasmon Resonance (LSPR) effect of oxygen vacancies, the BiVO4@BiOCl exhibits strong broad-spectrum degradation ability over the entire spectral range and exhibits excellent degradation cycle stability. The degradation rates of BiVO4@BiOCl for TC are 90.32%/71.17%, the TOC removal rates are 74.07%/57.81% and degradation efficiencies of CIP, BHA, Phenol, BPA and Coumarin are 49.36 ∼ 71.32%/37.88% ∼ 62.86%, respectively, after Vis/NIR light irradiation, respectively. It also shows good degradation performance of the mixed antibiotic solutions. This study offers a feasible research proposal for surface heterogeneous crystalline facet selective induction of oxygen vacancies to induce the enhanced full-spectrum broad-spectrum degradation performance of heterojunction photocatalysts for the application of environmental purification.