采用溶胶-凝胶法,在钛酸丁酯水解过程中加入一定量的尿素,制备了不同N掺杂量的光催化剂TiO2-xNx.以亚甲基蓝溶液为降解对象,研究催化剂在可见光区的催化性能;利用XRD、XPS、SEM、UV-Vis对催化剂的结构、形貌和光催化性能进行了表征.实验结果表明,掺杂的N以O-Ti-N的形式存在于TiO2结构中,N元素抑制了锐钛矿相向金红石相的转变和晶粒的长大;样品中形成了新的能级结构,提高了TiO2在可见光下的光量子效率和光催化能力.掺杂量为3.84%(质量分数)的TiO2-xNx在可见光区的响应能力最高,吸收波长延伸至520nm,其光催化活性最大,1.5h降解率达到55.54%.
Different N-doping photocatalysty is prepared by sol-gel method with a certain amount of urea added in the hydrolysis process of butyl titanate.The catalytic al performance of catalyst in the visible light area is studied by the degradation of methylene blue solution.XRD,XPS,SEM and UV-Vis are used for catalyst characterization.The results show that the N curbs the transition from anatase phase to rutile phase and the increase of grain size,doped-N exists in the structure of the TiO2 as the form of TiON and a new bond enrgy level forms,efficiency quantum and photochemical catalysis ability of TiO2 is improved under the visible light.The sample(3.84wt%) has the highest photocatalytic activity,the absorptive wavelength extends to 520nm and degradation is 55.54% under the visible light for 1.5h.
参考文献
| [1] | Yu JC;Ho WK;Yu JG;Yip H;Wong PK;Zhao JC .Efficient visible-light-induced photocatalytic disinfection on sulfur-doped nanocrystalline titania[J].Environmental Science & Technology: ES&T,2005(4):1175-1179. |
| [2] | Asahi R;Morikawa T;Ohwaki T et al.Visible-light photocatalysis in nitrogen-doped titanium dioxide[J].Science,2001,293:2692271. |
| [3] | 刘守新,陈孝云,陈曦.酸催化水解法制备可见光响应N掺杂纳米TiO2催化剂[J].催化学报,2006(08):697-702. |
| [4] | Sato S .Photocatalytic activity of NOx-doped TiO2 in the visible light region[J].Chemical Physics Letters,1986,123(122):126. |
| [5] | 王宝和,于才渊,王喜忠.纳米多孔材料的超临界干燥新技术[J].化学工程,2005(02):13-17. |
| [6] | 王建祺;吴文辉;冯大明.电子能谱学[M].北京:国防工业出版社,1992 |
| [7] | Di Valentin C;Pacchioni G;Selloni A et al.Characterization of pararmagnetic species in N-doped TiO2 powders by EPR spectroscopy and DFT calculations[J].Journal of Physical Chemistry B,2005,109:11414. |
| [8] | Diwald O;Thompson T L;Zubkov T et al.Photochemical activity of nitrogen-doped retile TiO2 (110) in visible light[J].Journal of Physical Chemistry B,2004,108:6004. |
| [9] | Sakthivel S;Janczarek M;Kisch H .Visible light activity and photoelectrochemical properties of nitrogen-doped TiO2[J].Journal of Physical Chemistry B,2004,108:19384. |
| [10] | Cong Y;Xiao L;Zhang J et al.Carbon and nitrogen-doped TiO2 with high visible light photocatalytic activity[J].Research on Chemical Intermediates,2006,32(08):717. |
| [11] | Burda C;Lou Y;Chen X et al.Enhanced nitrogen doping in TiO2 nanoparticles[J].Nano Letters,2003,3:1049. |
| [12] | Sakthivel S;Janczarek M;Kisch H .Visible light activity and photoelectrochemical properties of nitrogen-doped TiO2[J].Journal of Physical Chemistry B,2004,108:19384. |
| [13] | Chen X;Burda C .Photoelectron spectroscopic investigation of nitrogen-doped titania nanoparticles[J].Journal of Physical Chemistry B,2004,108:15446. |
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