以钛酸四丁酯为前驱体，氯化铵为掺杂剂，采用溶胶一凝胶法制备了N、Cl共掺杂改性的TiOz光催化剂（N—Cl-Ti），借助XRD、SEM、TEM、XPS及DRS等手段对其加以表征。以苯酚为模型反应物，研究了氯化铵掺杂量及热处理温度等制备条件对光催化活性的影响。结果表明，氯化铵掺杂抑制了锐钛矿相向板钛矿相的转变和晶粒的生长，改性后的TiO。光吸收带边可延伸约至780nm。N、C1元素分别以O—Ti—N和O-Ti—C1形式存在于TiO：晶格中。当氯化铵的掺杂量为3．0mol％，热处理温度为250℃时，改性后的TiO：可见光催化活性最高，可见光（420～800nm）照射120min后，苯酚的降解率可达75．689／6。
N-Cl-codoped TiO2photocatalysts were prepared by using Ti(OC4 H9)4 as the precursors and ammonium chloride as the dopant source. The photocatalytic activity for the degradation of phenol was evaluated, and the effects of ammonium chloride content and the heat treatment temperature were investigated. The as-prepared TiO2 powders were characterized with SEM,TEM,XRD,XPS and DRS. The results show that ammonium chloride added in TiO2 preparation can effectively restrain the phase transformation from anatase to brookite and the crystal grain growth. The absorption edge of the co-doped TiO2 is extended up to 780nm. XPS analysis reveals that N and C1 atoms are both interstitially and substitutionally situating in the TiO2 lattices to form of O-Ti-N and O-Ti-Cl , respectively. The photocatalytic of N-Cl-codoped TiO2is significantly affected by the dosage of doped ammonium chloride and calcination temperature, the optimum dosage and calcination temperature are 3.0 mol% and 250℃, respectively. Under the visible-light (420 - 800nm) irradiation with 120rain, the removal rate for phenol could achieve 75.68%.
参考文献
| [1] | Cary J H;Lawrence J;Tsoine H M .Photo-dechlorination of PCBs in Presence of Titanium dioxide in Aqueous Suspensions[J].Bull of Environ Contain Toxical,1976,16(06):697-701. |
| [2] | Fujishima A;Honda K .Electrochemical Photolysis of Water at a Semiconductor Electrode[J].Nature,1972,238:37-38. |
| [3] | Placidus B. Amama;Kiminori Itoh;Masayuki Murabayashi .Gas-phase photocatalytic degradation of trichloroethylene on pretreated TiO_2[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2002(4):321-330. |
| [4] | Ai Z H;Ho W K;Lee S C;Zhang L Z .Efficient Photocatalytic Removal of NO in Indoor Air with Hierarchical Bismuth Oxybromide Nanoplate Microspheres under Visible Environ[J].Science Technology,2009,43:4143-4150. |
| [5] | Yu H B;Chen S;Quan X;Zhao H M,Zhang Y B .Fabrication of a TiO2-BDD Heterojunction and its Application As a Photocatalyst for the Simultaneous Oxidation of an Azo Dye and Reduction of Cr(VI)[J].Environmental Science and Technology,2008,42:3791-3796. |
| [6] | Sato S .Photocatalytic activity of NOx doped TiO2 in the visible lightregion[J].Chemical Physics Letters,1986,123:126-128. |
| [7] | Asahi R;Morikawa T;Ohwaki T;Aoki K Taga Y .Visible Light Photocatalysis in Nitrogen-Doped Titanium Oxides[J].Science,2001,293:269-271. |
| [8] | T. Umebayashi;T. Yamaki;H. Itoh;K. Asai .Band gap narrowing of titanium dioxide by sulfur doping[J].Applied physics letters,2002(3):454-456. |
| [9] | 陈恒;龙明策;徐俊 .可见光响应的氯掺杂Ti2的制备、表征及其光催化活性[J].化学学报,2006,27(10):890-894. |
| [10] | 刘平安;刘粤惠.x射线衍射分析原理与应用[M].北京:化学工业出版社,2003:211. |
| [11] | 尹荔松;周歧发;詹新桂;林光明 张进修 .纳米TiO2粉晶的XRD研究[J].功能材料,1999,30(05):498-511. |
| [12] | Zhang, G;Ding, XM;He, FS;Yu, XY;Zhou, J;Hu, YJ;Xie, JW .Preparation and photocatalytic properties of TiO2-montmorillonite doped with nitrogen and sulfur[J].The journal of physics and chemistry of solids,2008(5/6):1102-1106. |
| [13] | Cong Y;Zhang JL;Chen F;Anpo M .Synthesis and characterization of nitrogen-doped TiO2 nanophotocatalyst with high visible light activity[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2007(19):6976-6982. |
| [14] | Hui Han;Renbi Bai .Buoyant Photocatalyst with Greatly Enhanced Visible-Light Activity Prepared through a Low Temperature Hydrothermal Method[J].Industrial & Engineering Chemistry Research,2009(6):2891-2898. |
| [15] | Saha N C;Tomkins H G .Titanium nitride oxidation chemistry:An X-ray photoelectron spectroscopy study[J].Applied Physics,1992,72(07):3072-3079. |
| [16] | Xu, H;Zheng, Z;Zhang, LZ;Zhang, HL;Deng, F .Hierarchical chlorine-doped rutile TiO2 spherical clusters of nanorods: Large-scale synthesis and high photocatalytic activity[J].Journal of Solid State Chemistry,2008(9):2516-2522. |
| [17] | Jing L Q;Fu H G;Wang B Q .Effects of Sn dopant on the photoinduced charge property and photocatalytic activity of TiOz nanoprticles[J].Applied Catalysis B:Environmental,2006,62:282-292. |
| [18] | 刘守新;刘鸿.光催化及光电催化基础与应用[M].北京:化学工业出版社,2005:135. |
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