Preparation of βCD‐AC functionalized ZnO/ZnSe for photocatalytic degradation of organic dye wastewater

Abstract

Conventional photocatalysts for degrading pollutants are limited because of the rapid recombination of electron–hole pair, difficulty in separation and recovery, and low efficiency in utilizing the visible light. To improve the adsorption capacity of the photocatalyst and reduce electron–hole recombination rate, βCD was anchored onto the porous activated carbon (AC) and then combined with ZnO/ZnSe to prepare βCD‐AC‐ZnO/ZnSe. The ZnO was a quasi‐hexahedron shape in the ZnO/ZnSe heterojunction and was tightly integrated with the βCD‐AC, which could improve the transfer ability of the photogenerated carrier. Considering the synergistic effect of βCD‐AC and ZnO/ZnSe, the UV absorption edge was red shifted, and the lifetime of the electrons–hole pairs was prolonged. Thus, the photocatalytic degradation ration of βCD‐AC‐ZnO/ZnSe reached 82% under visible light, which was about 1.8 and 4.2 times higher than those of the virgin heterojunction and AC‐ZnO/ZnSe, respectively. βCD‐AC‐ZnO/ZnSe exhibited excellent disinfection potential that 3.5 log Escherichia coli cells were killed for 120 min. The high‐efficiency visible‐light photocatalytic performance was demonstrated, and the •O2− played a main active role in the photocatalytic removal of pollutants. The present research provided a valuable route for the fabrication of photocatalyst for real‐world applications.