One-step preparation of direct Z-scheme NH2-UiO-66/BiOCl photocatalyst for antibiotic degradation by electrostatic adsorption

Abstract

In this work, based on the electrostatic adsorption theory, a direct Z-scheme NH₂-UiO-66/BiOCl composite photocatalyst was prepared by a one-step solvothermal method with NH₂-UiO-66 embedded on the smooth surface of flower-like BiOCl without additional chlorine source to form a close contact interface. The photocatalytic degradation of tetracycline hydrochloride (TCH) of 1.0-NH₂-UiO-66/BiOCl(1.0-NUBC) prepared under simulated sunlight was 1.63 times and 78.84 times that of pure BiOCl and pure NH₂-UiO-66, respectively. The reason for the enhanced photocatalytic performance may be that electrostatic adsorption promotes the homogeneous and orderly synthesis of heterogeneous structures, significantly increasing the ratio of NH₂-UiO-66/BiOCl surface, which not only improves the visible light response range but also promotes the formation of the interface electric field between NH₂-UiO-66 and BiOCl interface. The separation and transfer of the photogenerated electron–hole pairs are greatly promoted. Therefore, this study provides an effective way for the synthesis of BiOCl/MOF composites and has a good application prospect.