【摘要】 采用光沉积法制备了光稳定二氧化钛纳米管负载钯催化剂.通过X射线衍射、紫外-可见漫反射光谱、透射电子显微镜(TEM)、氮气吸附-脱附、X射线光电子能谱(XPS)、光致发光光谱和光电流等表征手段研究了催化剂的结构和性质.TEM表明二氧化钛纳米管经光照后仍然保持良好的管状结构;XPS结果表明大部分Pd以零价形式存在.以甲基橙溶液作为模拟废液研究了催化剂在紫外光及模拟日光条件下的光催化活性.当Pd的负载量为0.3 wt%时,催化剂的光催化活性最高并且优于P25的光催化活性.另外,通过在光降解过程中加入不同的捕获剂研究了不同氧化活性组分的作用.结果表明,光生空穴(hrb+)在光催化降解过程中起主要作用.更多还原

【Abstract】 Highly photostable palladium-loaded TiO₂ nanotubes（Pd/TNTs） were prepared by a simple photo-decomposition method and characterized by inductively coupled plasma,X-ray diffraction,UV-visible light diffuse reflectance spectroscopy,transmission electron microscopy(TEM],X-ray photoelectron spectroscopy（XPS）,photoluminescence spectroscopy,N2 adsorption-desorption,and photocurrent measurement.TEM images showed that the samples had a tubular structure.XPS results revealed that most of the palladium was present as Pd°.The photocatalytic performance was evaluated by monitoring the catalytic activity for the degradation of methyl orange solution under both UV and simulated sunlight irradiation.Pd/TNTs with 0.3 wt%Pd displayed higher activity than P25.The active species in the photocatalytic process were investigated by using different types of active species scavengers.h_vb⁺ was the major reactive species in the photodegradation over the Pd/TNTs.更多还原