科研之友
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摘要
The application of titanium oxide, one of the most studied photocatalysts, is imprisoned in UV-absorbing areas. Self-doping is a promising way towards the visible light zone. Herein, we report a facile method to produce a Ti3+ self-doped titanium oxide. By simply microwaving the aqueous suspension of the commercial crystalline titanium oxide, P25, for a few minutes with follow-up centrifugation and drying processes we are able to turn P25 into a Ti3+ self-doped material. UV-vis spectrum of the microwave-treated titanium oxide shows a good absorbing extension in visible light region. The existence of Ti3+ was detected by Electron Paramagnetic Resonance (EPR), and doping even caused partial amorphous structure as shown in High Resolution Transmission Electron Microscopy (HRTEM) image. This Ti3+ self-doped titanium oxide shows a high photocatalytic activity for degradation of rhodamine B under visible light irradiation with a first-order rate constant of 0.0957 min(-1), which is more than 90-fold higher than that of P25. Microwaving at alkaline condition showed better photocatalytic activity than at acid condition. The formation mechanism of the microwave-treated titanium oxide was studied and a plausible mechanism was proposed.
