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采用两步预掺杂方法制备出In离子掺杂二氧化钛纳米管可见光催化剂.可见光催化降解对氯苯酚实验证明:掺杂In离子量为3%的TiO2纳米管可见光活性最高,是纯TiO2纳米管的2倍以上.X射线衍射(XRD),X光电子能谱(XPS)和表面光电压谱(SPS)结果表明:当In离子掺杂浓度较小时,In离子取代晶格Ti的位置形成InxTi1-xO2取代式掺杂结构.In离子的掺杂能级与Ti离子的3d轨道形成混合价带,使禁带宽度变窄,增强了可见光响应.随着In离子掺杂浓度的增加,同时在InxTi1-xO2纳米管表面生成In2O3,形成InxTi1-xO2/In2O3纳米管复合结构.该复合结构有效地增加可见光响应,促进了光生载流子的分离,提高了光生载流子在固/液界面参加光催化反应的利用率,使纳米管催化剂可见光催化活性显著提高.
The visible light photocatalytic degradation of p-chlorophenol was carried out by a two-step pre-doping method.It was proved by experiments that the TiO2 nanotubes doped with 3% of In ions had the highest visible light activity and the pure TiO2 nanotubes (XRD), X-ray photoelectron spectroscopy (XPS) and surface photovoltage spectroscopy (SPS). The results show that when the doping concentration of In ions is small, In ions replace the Ti sites to form InxTi1-xO2 Type doping structure.The doping level of In ions forms a mixed valence band with the 3d orbit of Ti ions to narrow the forbidden band width and enhance the visible light response.With the increase of In doping concentration, In2O3 is formed on the surface of the nanotube to form a composite structure of InxTi1-xO2 / In2O3 nanotubes. The composite structure effectively increases the visible light response, promotes the separation of photogenerated carriers and improves the photocatalytic reaction of photogenerated carriers at the solid / liquid interface The utilization rate of nanotubes catalyst visible photocatalytic activity increased significantly.