Construction of Highly Active ZnInS (110)/g-CN System by Low Temperature Solvothermal for Efficient Degradation of Tetracycline under Visible Light.

Herein, ZnInS photocatalyst with (110) exposed facet was prepared by low temperature solvothermal method. On this basis, a highly efficient binary ZnInS/g-CN was obtained by low temperature solvothermal method and applied to the degradation of tetracycline (TC). The samples of the preparation were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscope, UV-vis diffuse reflection spectroscopy, and photoluminescence spectroscopy. Furthermore, the degradation performance of photocatalysts on TC was investigated under different experimental conditions. Finally, the mechanism of ZnInS/g-CN composite material degrading TC is discussed. The results show that ZnInS and ZnInS/g-CN photocatalysts with excellent performance could be successfully prepared at lower temperature. The ZnInS/g-CN heterojunction photocatalyst could significantly improve the photocatalytic activity compared with g-CN. After 150 min of illumination, the efficiency of 80%ZnInS/g-CN to degrade TC was 1.35 times that of g-CN. The improvement of photocatalytic activity was due to the formation of ZnInS/g-CN heterojunction, which promoted the transfer of photogenerated electron-holes. The cycle experiment test confirmed that ZnInS/g-CN composite material had excellent stability. The free radical capture experiment showed that ·O was the primary active material. This study provides a new strategy for the preparation of photocatalysts with excellent performance at low temperature.