Highly Active TiO2-xNx Visible Photocatalyst Prepared by N-Doping in Et3N/EtOH Fluid under Supercritical Conditions

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• 作者：Yuning Huo ; Zhengfeng Bian ; Xinyu Zhang ; Yi Jin ; Jian Zhu ; Hexing Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：April 24, 2008
• 年：2008
• 卷：112
• 期：16
• 页码：6546 - 6550
• 全文大小：154K
• 年卷期：v.112,no.16(April 24, 2008)
• ISSN：1932-7455

文摘

TiO_2-xN_x 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 TiO_2-xN_x than that using NH₃/EtOH fluid. Even with the same N-content, the TiO_2-xN_x 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.