可见光响应的镍硅共掺杂二氧化钛及其光催化性能  

Visible-Light-Activated Ni-Si Co-Doped TiO_2 with Photocatalytic Performance

作　　者：陈其凤[1,2] 史卫梅[1,2] 姜东[1] 徐耀[1] 吴东[1] 孙予罕[1] 

机构地区：[1]中科院山西煤炭化学研究所,太原030001 [2]中国科学院研究生院,北京100049

出　　处：《化学学报》2010年第4期301-308,共8页Acta Chimica Sinica

基　　金：国家自然科学基金(No.10835008)资助项目

摘　　要：为了更好地利用太阳光和提高二氧化钛的光催化性能,以钛酸四正丁酯、正硅酸乙酯、六水合硝酸镍为原料,在高压釜中140℃非水溶剂热反应,所得材料经400℃焙烧制得镍硅共掺杂的二氧化钛光催化剂.所得材料用X射线衍射、氮吸附、透射电镜、X射线光电子能谱、傅里叶变换红外光谱、紫外漫反射等测试手段分析,结果显示所有样品均为锐钛矿型二氧化钛,Si和Ni均掺杂到TiO2体相中,样品具有较大的比表面积,其最大达303.3m2·g-1.在可见光照射下,以降解罗丹明-B为探针反应研究其可见光催化性能,与未掺杂和镍掺杂的二氧化钛相比较,共掺杂的二氧化钛具有更高的可见光催化性能,当Ni/Ti和Si/Ti的物质的量的比分别为0.01和0.20时,可见光催化性能最好.可见光催化性能的提高归因于镍和硅的协同作用.To utilize the solar light more efficiently and enhance the photocatalytic performance of TiO2,nickel and silicon co-doped TiO2 was synthesized from a compound system of tetrabutyl titanate （TBT）,tetraethyl orthosilicate （TEOS） and nickel nitrate hexahydrate （NNH） at 140 ℃,which then was annealed at 400 ℃. The reaction was performed in a Teflon-lined steel autoclave with acetic acid as solvent using a non-aqueous method. The as-obtained materials were characterized by X-ray diffraction （XRD）,nitrogen adsorption,transmission electron microscopy （TEM）,X-ray photoelectron spectroscopy （XPS）,Fourier transform infrared spectroscopy （FT-IR）,as well as UV-visible diffuse reflectance spectroscopy （UV-vis DRS）. It was found that all the as-obtained materials were of an anatase phase,which is the TiO2 phase with the highest photocatalytic activity among anatase,rutile and brookite. One sample possessed the largest surface area of 303.3 m2·g-1. Furthermore,nickel and silicon were all introduced into the bulk of TiO2. The visible photocatalytic performance of the obtained materials was evaluated by rhodamine-B decomposition. The results showed that the photocatalytic activity of Ni-Si co-doped TiO2 was higher than that of TiO2 or Ni-doped TiO2,which was enhanced with increasing the nickel and silicon contents and then decreased,reaching the maximum at the Ni/Ti and Si/Ti molar ratios of 0.01 and 0.20,respectively. The enhanced visible photocatalytic performance was attributed to the synergetic effect of nickel and silicon co-doping.

关 键 词：锐钛二氧化钛 共掺杂 非水体系 可见光催化 罗丹明-B 

分 类 号：O643.36[理学—物理化学]