Key Words:ELECTRON-HOLE SEPARATION; HETEROJUNCTION PHOTOCATALYST; HYDROTHERMAL SYNTHESIS; DOPED ZNO; CDS; NANOPARTICLES; DEGRADATION; FABRICATION; COMPOSITE; BI2O2CO3
Abstract:In the study, Z-scheme CdS/BiOCl visible light reactive photocatalysts were prepared by a one-step synthesis. The composition, morphology, optical absorption property and degradation mechanism of as obtained binary composites were investigated in detail. SEM, TEM and XPS observation indicated that CdS nanoparticles were well dispersed on BiOCl nanosheets and bounded chemically to BiOCl. The CdS/BiOCl composite photocatalysts showed the enhanced photocatalytic performance on degrading RhB under visible light irradiation. Among them, 5-CdS/BiOCl exhibited the highest degradation rate (up to 94%), which was 1.9 and 4.7 times higher than those of CdS and BiOCl, respectively. And the performance of 5-CdS/BiOCl photocatalyst remained stable after four replicate experiments. The prime causes for the improved capability of CdS/BiOCl photocatalysts were their low carrier recombination and extended light response range. A feasible Z-scheme heterojunction mechanism was revealed according to radical capture experiments and photoelectrochemical tests. This study provides a new idea for wastewater purification.
Volume:58
Issue:13
Translation or Not:no