Synergistic effect of TiO2-CuWO4 on the photocatalytic degradation of atrazine
2019
He, Dewen | Yang, Yang | Tang, Jianjun | Zhou, Kanggen | Chen, Wei | Chen, Yiqing | Dong, Zijun
In this work, CuWO₄ is prepared and its effect of improving photocatalytic degradation of atrazine by TiO₂ as well as the synergetic mechanism is studied. Results show that the addition of CuWO₄ (50 mg/L) into the reaction system can significantly enhance the efficiency of atrazine degradation, resulting in an increased degradation efficiency of 92.1% after 270 min, which is 1.94 times higher than that of the single TiO₂. As the sintering temperate of CuWO₄ was increased, the degradation efficiency of atrazine increased initially and then deceased after reaching a maximum at 500 °C. The origin of the synergistic effect of TiO₂-CuWO₄ is attributed to the introduction of solid CuWO₄. The photochemical test results indicate that the photogenerated electrons transfer from irradiated TiO₂ to CuWO₄, which is beneficial to the O₂ reduction and H₂O₂ formation in aqueous solution thus promoting the photocatalytic activity of TiO₂. These observations unveil the importance of improving photocatalytic activity of TiO₂ with Cu-bearing semiconductors.
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