Citation: WEI Yuan, KANG Shi-Zhao, LI Xiang-Qing, QIN Li-Xia, MU Jin. Effect of Cu-Ni Cocatalyst on Visible Photocatalytic Activity of TiO2 for Phenol Preparation[J]. Chinese Journal of Inorganic Chemistry, ;2015, 31(8): 1581-1589. doi: 10.11862/CJIC.2015.198
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The Cu-Ni co-modified TiO2-based photocatalytic system was fabricated using TiO2 nanoparticles as the main catalyst component by an impregnation process followed by a reduction procedure. The effect of Cu-Ni cocatalyst on the visible photocatalytic activity of TiO2 for phenol preparation was studied using benzene as the starting material and hydrogen peroxide as the oxidant. The action mechanism of Cu-Ni cocatalyst for the photocatalytic activity of TiO2 nanoparticles is discussed. The results show that the pure TiO2 nanoparticles do not have photocatalytic activity for the phenol production from benzene under visible light irradiation. In contrast, the photocatalytic activity of TiO2 nanoparticles can be enhanced obviously due to the introduction of Cu and Ni. The yield of phenol is 18% when the Cu-Ni co-modified TiO2 nanoparticles are used as a photocatalyst. Moreover, there exists noticeable synergistic effect between Cu and Ni. The Cu-Ni co-modified TiO2 nanoparticles exhibit much higher photocatalytic activity in comparison with that of the Cu or Ni alone modified ones due to the synergistic effect. These results imply that the cheap cocatalyst with outstanding performance than that of noble metals may be prepared by taking advantage of the synergistic effect between various metals.
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