【摘要】 溶胶-凝胶法制备5at.%V掺杂的TiO2和纯TiO2,然后在500℃煅烧6h。XRD谱图显示,样品均是锐钛矿型TiO2,还有一些无定型成分,平均晶粒大小分别为6.8nm和9.7nm。TEM照片显示的纳米粒子大小分别在8.0~18.7nm和21.6~30.2nm范围内,比XRD计算结果大,这是因为样品未能充分分散所造成。EDS谱图显示V的掺杂量是6.5at.%,红外光谱也证实V元素的存在。拉曼光谱表明,V元素均匀地分散在TiO2中。Rh.B的光催化降解实验表明,V掺杂TiO2的光催化效率比纯TiO2低,这是由于较高的掺杂浓度导致电子-空穴复合中心增加,从而降低光催化效率。更多还原

【Abstract】 5at.% V doped TiO2 and pure TiO2 nanoparticles were synthesized throug the sol-gel method and calcined at 500 ℃ for 6 h.XRD pattens showed that both samples were anatase TiO2 with some amorphous and crystal sizes were 6.8 nm and 9.7 nm,respectively.TEM images showed that nanoparticle sizes were in the ranges of 8.0 ~ 18.7nm and 21.6 ~ 30.2 nm for V doped TiO2 and pure TiO2,respectively,larger than the values calculated from the XRD patterns,due to the poor dispersion of TiO2 samples.EDS measurement confirmed the presence of V elements with a6.5at.%,also supported by IR spectrum.Raman spectrum confirmed the well dispersions of V elements in the TiO2 matrix.The photodegradation of Rh.B showed that the photodegradation efficiency of V doped TiO2 was lower than that of pure TiO2,probably due to the enhancement of electron-hole pair recombination rate resulted from the high doping level.更多还原