摘要
以一种简单的方法制备CuWO_4,并研究了CuWO_4促进Ti O_2光催化降解水中阿特拉津的效能及可能机理。结果表明,反应体系加入少量(50 mg/L)CuWO_4显著加快Ti O_2光催化降解水中阿特拉津,反应270 min降解率达92.1%,较单一Ti O_2催化效率提高1.94倍;CuWO_4在降解过程中显示出较强的稳定性,溶液中微量溶解的Cu~(2+)接收电子形成Cu(II)/Cu(I)的价态变化;随CuWO_4煅烧温度(100~800℃)的升高降解率先增大后下降,500℃达到最大,而Cu~(2+)溶出率则显著降低,CuWO_4-Ti O_2催化体系的正效应归功于固态CuWO_4;光生电子及HO~·自由基及光生电子在反应体系中起主要作用。实验结果有助于其他Cu基半导体提升Ti O_2催化活性的研究。
CuWO_4was prepared by a simple method,and Cu WO_4improving photocatalytic degradation for atrazine by Ti O_2as well as the possible mechanism was studied.Results showed that,an addition of a small amount of CuWO_4(50 mg/L)into the reaction system could significantly enhance the efficiency of atrazine degradation,resulting in an increased degradation efficiency of 92.1%after 270 min,which was 1.94 times higher than that of the single TiO_2.CuWO_4showed robust stability and the slight dissolved Cu~(2+)received e-forming behavior of Cu(II)/Cu(I)during the photocatalytic process.As the sintering temperate of Cu WO_4increased(100~800℃),the degradation efficiency of atrazine increased initially and then deceased,the maximum reached at500℃,but the dissolution rate of Cu~(2+)decreased significantly.The origin of high phtotocatalytic effect of TiO_2-CuWO_4was attributed to the introduction of solid Cu WO_4.The photo-induced electron and HO~·radical played an important role in this reaction system.The experimental results were conductive to the research of improving photocatalytic activity of TiO_2with Cu-bearing semiconductors.
引文
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