Enhanced photocatalytic activity of Bi(2)WO(6)for the degradation of TC by synergistic effects between amorphous Ti and Ni as hole-electron cocatalysts

摘要

Novel Bi(2)WO(6)nanoflakes co-modified by a Ni-Ti cocatalyst for the degradation of tetracycline (TC) were preparedviaa hydrothermal and impregnation method. Scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) emission spectroscopy, and UV-vis diffuse reflection spectroscopy (DRS) techniques were used to explore the microstructures and optical characteristics of the photocatalysts. Also, the optimal Ni/Ti-Bi(2)WO(6)composites with 2 wt% Ni and 5 wt% Ti achieved 93.5% removal efficiency of TC, which was higher than that of the pristine Bi(2)WO(6)and Ti-Bi2WO6. Moreover, Ni/Ti-Bi(2)WO(6)photocatalysts presented good stability after five degradation cycles. h(+)and & x2d9;O(2)(-)were the main active species, as revealed by the scavenger experiment. It revealed that the amorphous Ti and Ni as hole-electron cocatalysts can enhance the ability of the photocatalyst to absorb light and promote the transfer of photogenerated carriers.