多元复合纳米光催化剂的制备及可见光下降解染料废水

以钛酸四丁酯为Ti源,通过溶胶-凝胶法制备TiO₂、CdS/TiO₂、BiPO₄/TiO₂、CdS/BiPO₄/TiO₂(BCT),对制备的材料进行UV-Vis、XRD、SEM、TG-DTG表征,并在可见光下对玫瑰红B模拟染料废水进行光催化,考察pH、煅烧温度、催化剂用量对降解效果的影响,对4种材料的光催化效果进行对比。结果表明,CdS/TiO₂、BiPO₄/TiO₂、BCT对可见光有较好的响应能力;在玫瑰红B初始质量浓度15 mg/L,催化剂用量1 mg/L,pH 7时,BCT光催化降解率达98.6%,效果相对最佳。研究4种催化剂材料在可见光下降解玫瑰红B的动力学,BCT常数为0.024 min_-1,循环使用5次后仍具有较好的光降解性能。

Preparation of multi-component composite nano-photocatalyst and degradation of dye wastewater under visible light

Using tetra-n-butyl titanate as Ti source,TiO₂,CdS/TiO₂,BiPO₄/TiO₂,CdS/BiPO₄/TiO₂(BCT)were prepared by sol-gel method.The materials were characterized by UV-Vis,XRD,SEM and TG-DTG.Un?der the visible light,rose red B simulated dye wastewater was accelerated.The effects of pH,calcination tem?perature and catalyst dosage on the degradation were investigated.The four kinds of materials were obtained from four kinds of materials,and the photocatalytic effects of the four materials were compared.The results showed that CdS/TiO₂,BiPO₄/TiO₂/TiO₂ and BCT had a good response to visible light;when the initial concen?tration of rose red B was 15 mg/L,the dosage was 1 mg/L,pH 7,the photocatalytic degradation of BCT reached 98.6%.The kinetics of degradation of rose red B by four materials under visible light and the reuse of catalyst materials were studied.The BCT constant was 0.024 min-1.After recycling for five times,the four ma?terials still had good photodegradation performance.