文摘
TiO2-xNx nanocrystallines were prepared by treating the TiO2 precursor in triethylamine/ethanol (Et3N/EtOH)fluid under supercritical conditions. During photodegradation of p-chlorophenol under irradiation with visiblelights, this catalyst exhibits much higher activity than the N-doped TiO2 obtained via direct calcination. Thepromoting effect of the supercritical treatment could be attributed to the high surface area, the highly crystallizedanatase, and the strong interaction of N-dopants with TiO2, leading to the enhanced light harvesting andreactant adsorption as well as quantum efficiency of photocatalysis via inhibiting the recombination betweenphotoinduced electrons and holes. Supercritical treatment using Et3N/EtOH fluid results in higher N-contentin the TiO2-xNx than that using NH3/EtOH fluid. Even with the same N-content, the TiO2-xNx obtained inEt3N/EtOH is still much more active than that obtained in NH3/EtOH fluid, possibly owing to the enhancedsurface hydrophobicity which could promote the adsorption of reactant molecules for degradation.