TiO2光催化处理漂白废水的影响因素

以TiO2粉末作为光催化剂,中压汞灯作为光源处理漂白废水.研究发现,pH、光催化剂反应浓度、通氧方式、反应时间对光催化氧化去除漂白废水CODCr值存在显著的影响.结果表明,pH、光催化剂反应浓度均有一个最佳值;氧的通入方式对光催化氧化降解CODcr也存在显著的影响,通入纯氧对光催化氧化去除CODCr效果最好;CODCr值随时间延长而持续下降,开始下降速率最快,后期下降速率变慢.同时还发现废水色度的下降与CODCr的下降有着相同的趋势.

Effecting Factors in Titanium Dioxide Photocatalyzed Degradation of Waste Water from Bleaching

Titanium dioxide mediated photocatalysed degradation of bleaching effluent, was investigated in aqueous suspensions of titanium dioxide by monitoring the depletion of chemical oxygen demand (CODCr) content as a function of irradiation time under a variety of conditions.The degradation rates were studied under different conditions such as pH, catalyst concentration, irradiation time, different modes of oxygen aeration.The deg-radation rates were found to be strongly influenced by all the above parameters. pH and catalyst concentration have a most proper value; aerating purified oxygen was best for degradation; degradation rates were declined with irradiation time passing. Meanwhile, the degradation rates of colority decrease with reaction time passing too.