H_3PW_(12)O_(40)/TiO_2/SiO_2超声光催化降解荧光增白剂废水的研究

H_3PW_(12)O_(40)/TiO_2/SiO_2 sonophotocatalytic degradation of fluorescent whitening agent wastewater

以溶胶凝胶法和浸渍烧结法制备得到H3PW12O40/TiO2/S iO2表面负载修饰型光催化剂,由XRD、SEM、BET分别进行了结构表征。以该H3PW12O40/TiO2/S iO2颗粒为光催化剂,对超声光催化降解荧光增白剂CBW水溶液的反应进行了研究。结果表明,H3PW12O40/TiO2/S iO2光催化技术对于CBW水溶液具有较好的降解效率,引入超声辐射可明显地提高CBW的降解效率,相应的伪一级反应速率常数k为0.014 77 m in-1。分析了耦合作用下的协同机理。进一步的试验证实CBW的降解反应速率随着超声波的输入功率以及悬浮液中的持氧量的增加而增加。

A novel supported and surface modification photocatalyst, i.e. H3PW12O40/TiO2/SiO2, was prepared by the successive sol-gel, impregnation and calcinations methods. XRD, SEM and BET characterized the physicochemical structures of products. The sonophotocatalytic degradation of CBW in aqueous was carried out by using assynthesized H3PW12O40/TiO2/SiO2 photocatalyst. The experimental results show that the CBW in aqueous could be well decomposed in the presence of H3PW12O40/TiO2/SiO2 photocatalyst, and the decomposition efficiency can be further enhanced by introducing ultrasonic into above reaction system. The corresponding pseudo-first reaction rate constant k was 0.014 77 min^-1. The synergetic mechanisms were analyzed subsequently. Moreover, the experiment demonstrated that the degradation reaction rate of CBW in power of ultrasonic and the concentration of holding oxygen aqueous could be augmented by increasing the input in suspension.