Cd/CdS光催化降解甲基橙的研究

A study on photocatalytic degradation of methyl orange by Cd/CdS

采用胶体化学法制备表面富镉的Cd/CdS纳米粒子为催化剂对水溶液中甲基橙的光催化降解进行了研究。探讨了光催化反应机理,讨论了光催化剂用量,双氧水的用量,试液的pH值,光照时间与甲基橙脱色率的关系。实验结果表明,当甲基橙起始浓度为20mg/L,Cd/CdS用量为0.500g,双氧水用量为5.88mmol/L,pH值为7.0时,光照6h,甲基橙的脱色率可达到95.5%。

In this article,photocatalytic degradation of methyl orange in aqueous solution has been studied with surface Cd-rich CdS nanoparticles which were prepared by colloid chemistry process. Reaction mechanism of photocatalysis was probed. The relationships between quantity of photocatalyst,quantity of H_2O_2,pH values, illumination time and the decolorizing efficiency of methyl orange were discussed. The results show that the decolorizing efficiency of methyl orange can reach 95.5% by using Cd/CdS as heterogeneous photocatalyst,with initial concentration of methyl orange=20mg/L,the quantity of catalyst=0.500g,quantity of H_2O_2=~5.88 mmol/L, pH=7.0, illumination time=6h.