采用水热法制备了可见光响应的氮掺杂TiO2光催化剂,利用XRD、SEM、XPS、UV-vis对样品结构、形貌和光谱等性质进行表征.研究结果表明:氮掺杂抑制晶粒长大,促进晶格畸变；氮进入TiO2晶格中,引起TiO2光催化剂的激发,吸收光谱向低能方向移动.以降解甲基橙为模型反应,研究样品的光催化性能；以对苯二甲酸作为·OH自由基捕获剂,利用化学荧光技术研究光催化反应体系中·OH自由基生成量.结果表明:与纯TiO2相比,氮掺杂样品具有较高的光催化活性.这与下列因素有关:氮掺杂样品具有较小的晶粒尺寸,有利于促进光生电荷的分离与相界面上电荷转移效率,降低TiO2能隙并使吸收光谱红移.在实验条件下,光催化性能随n(N/Ti)比值的增大而增强；羟基自由基的生成速率与光催化活性规律一致,即·OH的生成速率越大,光催化活性越高.
参考文献
| [1] | Hermann J M;Disdier J;Pichat P et al.TiO2-based Solar Photocatalytic Detoxification of Water Containing Organic Pollutants.Case Studies of 2,4-dichlorophenoxyaceticacid (2,4-D) and of Benzofuran[J].Applied Catalysis B:Environmental,1998,17:15-16. |
| [2] | 陈桂华,梁华定,葛昌华,韩德满,王芳,杨辉.钒掺杂纳米二氧化钛的制备及光催化活性研究[J].人工晶体学报,2010(05):1243-1248,1260. |
| [3] | Balcerski W;Ryu S Y;Hoffmann M R .Visible-light Photoactivity of Nitrogen-doped TiO2:Photo-oxidation of HCO2 H to CO2 and H2O[J].Journal of Physical Chemistry C,2007,111:15357-15362. |
| [4] | Chen L C;Tsai F R;Fang S H et al.Properties of Sol-gel SnO2/TiO2 Electrodes and Their Photoelectrocatalytic Activities under UV and Visible Light Illumination[J].Electrochimica Acta,2009,54:1304-1311. |
| [5] | J.Wang;S.Uma;K.J.Klabunde .Visible light photocatalysis in transition metal incorporated titania-silica aerogels[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2004(2):151-154. |
| [6] | Ozaki H;Iwamoto S;Inoue M .Improved visible-light responsive photocatalytic activity of N and Si co-doped titanias[J].Journal of Materials Science,2007(11):4009-4017. |
| [7] | 申乾宏,杨辉,高基伟.具有稳定可见光催化活性TiO2薄膜的常温制备[J].无机化学学报,2007(10):1758-1762. |
| [8] | Yu JC.;Yu JU.;Ho WK.;Jiang ZT.;Zhang LH. .Effects of F- doping on the photocatalytic activity and microstructures of nanocrystalline TiO2 powders[J].Chemistry of Materials,2002(9):3808-3816. |
| [9] | 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. |
| [10] | Wei Zhao;Wanhong Ma;Chuncheng Chen;Jincai Zhao;Zhigang Shuai .Efficient Degradation of Toxic Organic Pollutants with Ni_2O_3/TiO_(2-x)B_x under Visible Irradiation[J].Journal of the American Chemical Society,2004(15):4782-4783. |
| [11] | M.Sathish;B.Viswanathan;R.P.Viswanath;Chinnakonda S.Gopinath .Synthesis,Characterization,Electronic Structure,and Photocatalytic Activity of Nitrogen-Doped TiO_2 Nanocatalyst[J].Chemistry of Materials,2005(25):6349-6353. |
| [12] | Saha N C;Tomkins H C .Titanium Nitride Oxidation Chemistry:An X-ray Photoelectron Spectroscopy Study[J].Journal of Applied Physics,1992,72:3072-3079. |
| [13] | Michael R. Hoffmann;Scot T. Martin;Wonyong Choi;Detlef W. Bahnemann .Environmental Applications of Semiconductor Photocatalysis[J].Chemical Reviews,1995(1):69-96. |
| [14] | Akira Fujishima;Tata N. Rao;Donald A. Tryk .Titanium dioxide photocatalysis[J].Journal of photochemistry and photobiology, C. Photochemistry reviews,2000(1):1-21. |
| [15] | T.Ihara;M.Miyoshi;Y.Iriyama;O.Matsumoto;S.Sugihara .Visible-light-active titanium oxide photocatalyst realized by an oxygen-deficient structure and by nitrogen doping[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2003(4):403-409. |
| [16] | Xiao Q;Si Z C;Zhang J et al.Photoinduced Hydroxyl Radical and Photocatalytic Activity of Samarium-doped TiO2 Nanocrystnlline[J].Journal of Hazardous Materials,2008,150:62-67. |
| [17] | Fang X W;Mark G;Sonntag C V .OH Radical Formation by Ultrasound in Aqueous Solutions Part 1:the Chemistry Underlying the Terephthalate Dosimeter[J].Ultrasonics Sonochemistry,1996,3:56-57. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%