钌-钯掺杂Ti/TiO2阳极电催化降解甲基橙研究

以偶氮染料甲基橙为处理对象, 分别考察了Ru, Pd及Ru-Pd掺杂的Ti/TiO2阳极的光、电催化活性, 并与Ti/RuOx-PdO阳极的电催化活性进行了比较; 利用XPS分析了Ru-Pd掺杂的Ti/TiO2阳极表面Ru, Pd及Ti的化学形态. 实验发现, Ru, Pd及Ru-Pd掺杂的Ti/TiO2阳极的光催化活性都有所降低, 而其电催化活性却都有大幅提升, 特别是Ru-Pd掺杂的Ti/TiO2阳极, 其电催化活性明显地优于Ti/RuOx-PdO阳极. XPS分析表明, Ru-Pd掺杂的Ti/TiO2阳极其光、电催化活性的变化可能与该阳极表面Ru, Pd及Ti的化学形态变化有关.

Investigation on Electrocatalytic Degradation of Methyl Orange on Ti/TiO2 Anode Doped with Ru-Pd

Using reticulate titanium slice as a cathode, sodium chloride as a supporting electrolyte, photocatalytic and electrocatalytic degradation of methyl orange on Ti/TiO2 anodes doped with Ru, Pd and Ru-Pd were studied in this paper. The results showed that the photocatalytic activity of doped Ti/TiO2 anodes was lower than that of undoped ones, and the order of photocatalytic activity was Ti/Ru-Pd-TiO2＜Ti/Pd-TiO2＜Ti/Ru-TiO2＜Ti/TiO2. However, the electrocatalytic activity of the doped Ti/TiO2 anodes was improved greatly, especially the Ti/TiO2 anode doped with Ru-Pd, and the order of electrocatalytic activity was Ti/Ru-Pd-TiO2＞Ti/Ru-TiO2＞Ti/Pd-TiO2＞Ti/TiO2. Furthermore, the electrocatalytic activity of Ti/TiO2 anode doped with Ru-Pd was better than that of Ti/RuOx-PdO anode, which had been reported to possess excellent electrocatalytic capacity in our former work. And the research also indicated that the discrepant electrocatalytic activity between the doped and undoped Ti/TiO2 anodes was caused by their different capacity of electrolyte generating active chlorine in sodium chloride solution. The change of photocatalytic and electrocatalytic activities of Ti/TiO2 anode doped with Ru-Pd might have a key relation to the changed chemical form of Ru, Pd and Ti on its surface, according to the analysis results of X-ray photoelectron spectroscopy.