TiO_2/ZnO复合膜-H_2O_2光催化体系对甲基橙废水的降解脱色

Degradation and decolorization of methyl orange-containing wastewater by photocatalytic system of TiO_2/ZnO composite membrane-H_2O_2

采用仿生合成法制备TiO2/ZnO复合膜光催化剂,并以氙灯模拟日光光源,甲基橙为模型反应物,研究了催化剂投加量、H2O2投加量、溶液初始浓度、pH值和催化剂重复使用等因素对H2O2协同光解脱色甲基橙效率的影响。结果表明,当pH值为6,催化剂投加量为0.7 g/L,H2O2投加量为3.90 mmol/L时,对初始质量浓度为15 mg/L的甲基橙废水,130 min内脱色率达100%。酸性对光催化反应有促进作用,碱性对反应有抑制作用。催化剂重复使用5次后,处理130 min对甲基橙染料废水的脱色率仍可超过70%。

The photocatalyst： TiO2/ZnO composite membrane-H2O2 was prepared by biominetic synthesis method. Using methyl orange as the model reactant, the influences of catalyst dosage, H2O2 dosage, solution initial coneentration, pH value, recycling times of catalyst, and some other factors on photoeatalytic degradation of methyl orange by catalyst cooperated with H2O2 under xenon lamp simulated sunlight irradiation were investigat- ed. The results showed that, when the pH value was 6, the catalyst dosage was 0.7, the H202 dosage was 3.90 mmol/L, the initial mass concentration of methyl orange-containing wastewater was 15mg/L, the decolorization rate eould reach 100% within 130 min. Photocatalytie reaction eould be promoted with acidity and inhibited with alkalinity. Using the catalyst whieh had been reused for 5 times to treat methyl orange-eontaining wastewater, the deeolorization rate was still above 70% in 130 rain.