纳米TiO2/EP光催化降解罗丹明B废水的研究

通过溶胶-凝胶法制备出可漂浮于水面的膨胀珍珠岩(EP)负载型TiO2,研究其在水中对罗丹明B(RB)的去除效果、吸附降解动力学以及最佳工艺条件,并研究其多次回收再生后的降解效果。结果表明,浸渍3次的负载型TiO2光催化活性最高,回收5次后活性变化很小,降解率下降不到8%;光催化剂用量为0.2 g,20 mL初始浓度为10 mg/L和15mg/L RB溶液光照6 h后降解率分别达98%和74%。在实验浓度范围内,该光催化反应可用一级反应动力学方程描述。

Photocatalytic degradation of Rhodamine B by nanoTiO2-expanded pearlite

Floating environmental remediation materials,expanded perlite(EP) modified different loading times with TiO2 were prepared by Sol-Gel method.Photocatalytic degradation of Rhodamine B in polluted water by the materials(TiO2-EP)adsorption degradation kinetics,as well as the effects of recycling times,different loading times and the initial concentration of Rhodamine B on photocatalysis rate were studied.The recovered efficiency and catalytic activity of the regenerated photocatalyst were also tested.The results showed that photocatalyst modified three times with TiO2 is better than others.When the amount of photocatalyst is 0.2 g,after 6 h,removal rates of Rhodamine B in solutions with 10 mg/L and 15 mg/L Rhodamine B were 98% and 74%,respectively.The photocatalyst activity has little change after the five times recycling,and the degradation rate of Rhodamine B decreased less than 8%.The reaction of photocatalysis for Rhodamine B can be expressed as first-order kinetic mode within the concentration range of Rhodamine B between 10 mg/L and 30 mg/L.