TiO_2-ZnIn_2S_4复合光催化剂的制备及其对罗丹明B废水的降解

Preparation of TiO_2-ZnIn_2S_4 Composite Photocatalyst and Its Degradation for Rhodamine B

为改善ZnIn_2S_4可见光降解特性,采用水热法制备了复合光催化剂TiO_2-ZnIn_2S_4,对催化剂进行了表征;并研究了其光催化降解染料废水罗丹明B的特性,探讨了催化剂投加量、初始pH等条件对催化剂降解污染物活性的影响,分析了TiO_2-ZnIn_2S_4复合光催化剂与纯ZnIn_2S_4相比催化效率提高可能存在的原因。结果表明,TiO_2与ZnIn_2S_4以一种特殊结构复合在一起,且在可见光照射下具有良好的光催化性能。以氙气灯模拟太阳光,罗丹明B染料废水初始质量浓度15mg/L,TiO_2-ZnIn_2S_4投加量80mg/L条件下反应2h可降解水中97.42%的罗丹明B,与纯ZnIn_2S_4对比降解率增加了6.24%,具有较好的研究价值与开发前景。

In order to improve the visible light photocatalytic activity ofa ZnIn2S4, composite photocatalyst TiO2-ZnIn2S4 was prepared by hydrothermal method, and it was characterized. The property of TiO2-ZnIn2S4 photocatalytic degradation for Rhodamine B was researched, and the effect of catalyst dosage, initial pH on pollutant degradation by catalyst was discussed. The possible reasons for catalytic efficiency improvement of composite photocatalyst TiO2-ZnIn2S4 compared to pure ZnIn2S4 were analyzed. The results showed that, TiO2 was combined with ZnIn2S4 with a special construction, and it had a good photocatalytic degradation property under visible light irradiation. When the initial mass concentration of Rh B was 15 mg/L, TiO2-ZnIn2S4 dosage was 80 mg/L, and xenon lamp as the sunlight, the degradation rate ofRh B was 97.42% in water after 2 h of reaction, which improved by 6.24% compared to pure ZnIn2S4, and had good research value and development prospect.