负载型TiO_2在双脉冲放电水处理中的应用

Application of Loaded TiO_2 to Water Treatment by Bipolar Pulsed Discharge

在双脉冲放电等离子体水处理过程中,会伴有光辐射等物理效应,而光催化剂可以利用这部分的光辐射能量。为此,研究了在气液固三相混合体双极性脉冲放电条件下添加光催化剂的方式,以及其对于有机污染物降解所起到的效果。利用溶胶-凝胶法制备负载型的纳米TiO2光催化剂,选择典型的染料废水靛蓝二磺酸钠作为处理对象,检验其对于染料废水降解的催化处理效果。实验结果表明:当固相的玻璃珠上负载了纳米TiO2光催化剂时,靛蓝溶液的降解效率有了一定程度的提高,并且2次镀膜负载TiO2光催化剂时的催化处理效果优于1次镀膜时的催化处理效果。电压增大,催化处理效果提升的程度减小,气体体积流量升高,催化处理效果会略有提高。在电压为30kV、气体体积流量为1.0m3/h的条件下,放电处理3min就可以使靛蓝溶液完全褪色。

Aqueous phase electrical discharge has been used to remove organics in water. Photo radiation is one of the main physical effects accompanying the discharge that can be used by photocatalyst. Therefore, the effect of the photocatalyst to the degradation of the organic pollutant is investigated using a packed bed reactor by bipolar pulsed discharge in the air-water-solid mixture. The loaded nanoparticle TiO2 photocataiyst is obtained using the sol-gel method and dye solution is chosen as the target to test the catalytic effect of the nanoparticle TiO2 photocatalyst. Experiment results prove that the degradation efficiency of the indigo solution increases as the photocatalyst presenting in the plasma reactor. And the catalytic enhancement effect increases with the increase of the thickness of TiO2 coating. In addition, the synergistic effect decreased a little when applied voltage increased while increased with the increase of the gas flow rate. The indigo solution is totally decolorized Within 3 min by bipolar pulsed discharge under the condition of a 30 kV peak voltage and 1.0 ma/h air flow.