TiO_(2)/ZnO/SnO_(2)的制备及光臭氧协同催化深度处理制革废水

Preparation and Photocatalytic Ozonization of TiO_(2)/ZnO/SnO_(2) for Advanced Treatment of Tannery Wastewater

采用溶剂热法制备了复合金属氧化物催化剂(TiO_(2)/ZnO/SnO_(2)),以生化制革废水为处理对象,废水COD为110~140 mg/L,对催化剂光催化臭氧氧化性能进行了探。考察了催化剂种类、反应时间、催化剂用量、臭氧浓度等因素对生化制革废水COD去除率的影响。XPS、XRD、UV-Vis DRS、SEM、TEM及FT-IR等结果证明,实现了复合金属氧化物催化剂的制备。光催化臭氧氧化实验结果表明,与单独光催化和臭氧催化氧化相比,光催化臭氧氧化能明显提高生化制革废水的COD去除率。当催化剂用量为0.8 g/L,臭氧浓度20 mg/L,复合催化剂光催化臭氧氧化效果最佳,反应150 min后,COD去除率达到83.7%。重复实验结果表明TiO_(2)/ZnO/SnO_(2)稳定性较好。本研究利用光催化和臭氧催化氧化协同作用深度处理制革废水,效率较高、无二次污染,可为工业污水深度处理提供参考。

The composite metal oxide catalyst(TiO_(2)/ZnO/SnO_(2))was prepared by solvothermal method.The tannery wastewater after biochemical treatmented was treated with COD of 110~140 mg/L.The photocatalytic ozonation performance of the catalyst was investigated.The effects of catalyst type,reaction time,catalyst dosage and ozone concentration on COD removal rate of tannery wastewater after biochemical treatmented were investigated.The results of XPS,XRD,UV-vis DRS,SEM,TEM and FT-IR showed that the preparation of composite metal oxide catalyst was realized.The experimental results of photocatalytic ozonation show that photocatalytic ozonation can significantly improve the COD removal rate of biochemical tannery wastewater compared with photocatalytic and ozone catalytic oxidation alone.When the dosage of catalyst is 0.8 g/L and the concentration of O_(3) is 20 mg/L,the photocatalytic ozonation effect of composite catalyst is the best.After 150 min of reaction,the COD removal rate reaches 83.7%.The repeatability test results show that the composite catalyst has good stability.In this study,the synergistic effect of photocatalysis and ozone catalytic oxidation was used to treat tannery wastewater.It has high efficiency and no secondary pollution.It can provide a reference for the advanced treatment of industrial wastewater.