A Study on the Visible Photocatalytic Property of PW11O39Co(II)(H2O)(5-) in Homogeneous and Heterogeneous Systems

作者：Hua Ying-Jie; Xu Xiao-Nan; Zou Xiao-Mei; Han Lei-Yun; Wu Meng; Wang Chong-Tai^*

来源：Chinese Journal of Inorganic Chemistry, 2014, 30(8): 1895-1903.

• Keggin-type Cobalt-substituted heteropolyanion
• visible photocatalyst
• rhodamine B degradation
• D301R anionic exchange resin

The visible photocatalytic activity of the Keggin-type cobalt-substituted heteropolyanion PW11O39Co(II) (H2O)(5-)(PW11Co) and its heterogeneous system PW11Co/D301R was evaluated through the photodegradation of the dye pollutant rhodamine B (RhB) as a probe. A photocatalysis mechanism was suggested and the influences of the catalyst amount, the solution acidity as well as the interaction between PW11Co and RhB were also examined. The experimental results showed that both of the homogeneous system PW11Co and the heterogeneous system PW11Co/D301R have a high photocatalytic activity for the visible photodegradation of RhB, but the photocatalytic activity of PW11Co/D301R is higher than that of PW11Co, for example, with other identical conditions it took 90 min for a complete degradation of RhB with a concentration of 10 mu mmol.L-1 for the former, but 50 min for the latter. The mineralization percentage of RhB at 120 min during degradation is 34% for the former, but 48% for the latter. The hydroxyl radicals are considered to be responsible for the RhB degradation. Compared to the homogeneous system, the photocatalytic degradation rate of RhB is obviously enhanced in the heterogeneous system due to the weakened complexation of PW11Co with RhB and the enrichment of D301R towards RhB.

• 出版日期2014-8-10
• 单位海南师范大学