以硫脲为S的源物质,以钛酸丁酯为TiO2的前驱体,采用溶胶-凝胶法制备S-TiiO2光催化剂.利用XRD,XPS和FTIR等技术分析S掺杂对TiO2晶格结构的影响,并探讨元素S在TiO2晶格中的化学状态以及所形成的化学键的类型.结果表明:掺杂的S以S4+进入TiO2晶格中取代部分Ti4+,形成Ti1-xSxO2催化剂;S4+在TiO2的价带上形成1个电子占据能级,价带上的电子占据能级的价带项位主要由S3p态构成,同时S3p也有助于形成1个由Ti3d和O2p态构成的导带,S3p态与价带的交叉使价带变宽,导敛能带变窄,从而改善TiO2的光谱响应,使吸收边缘扩展到可见光的区域.对亚甲基蓝的光降解实验结果证实硫掺杂明显提高了光催化活性.
参考文献
| [1] | CHOI W K;TERMIN A;HOFFMANN M R .The role of metallic dopants in quantum-sized TiO2:correlation between photoreactivity charge carrier recombination dynamics[J].Journal of Physical Chemistry,1997,98:13669-13679. |
| [2] | Ping Yang;Cheng Lu;Nanping Hua;Yukou Du .Titanium dioxide nanoparticles co-doped with Fe~(3+) and Eu~(3+) ions for photocatalysis[J].Materials Letters,2002(4):794-801. |
| [3] | 陈俊涛,李新军,杨莹,王良焱,何明兴.稀土元素掺杂对TiO2薄膜光催化性能的影响[J].中国稀土学报,2003(z2):67-71. |
| [4] | A.M.Ruppert;T.Paryjczak .Pt/ZrO2/TiO2 catalysts for selective hydrogenation of crotonaldehyde:Tuning the SMSI effect for optimum performance[J].Applied Catalysis, A. General: An International Journal Devoted to Catalytic Science and Its Applications,2007(0):80-90. |
| [5] | Anpo M.;Takeuchi M. .The design and development of highly reactive titanium oxide photocatalysts operating under visible light irradiation [Review][J].Journal of Catalysis,2003(1/2):505-516. |
| [6] | OHNO T;AKIYOSHI M;UMEBAYASHI T et al.Preparation of S-doped TiO2 photocatalyst and their photoeatalytic activities under visible light[J].Applied Catalysis A:General,2004,265(01):115-121. |
| [7] | MORIKAWA T;ASAHI R;AOKJ K et al.Band-gap narrowing of titanium dioxide by nitrogen doping[J].Japanese Journal of Applied Physics Part 2-Letters and Express Letters,2001,40(06):561-563. |
| [8] | CHOI W Y;TERMIN A;HOFFMANN M R .The role of metal-ion dopants in quantum-sized TiO2:correlation between photoreactivity and charge-carrier recombination dynamics[J].Journal of Electrochemical Society,1994,98:13669-13679. |
| [9] | ASAHI R;MORKAWA T;OHWAKI T et al.Visible-light photocatalysis in nitrogen-doped titanium oxides[J].Science,2001,293(13):269-271. |
| [10] | UMEBAYASHI T;YAMAKI T;YAMAMOTO S;MIYASHITA A,TANAICA S,SUMITA T,ASAI K .[J].Journal of Applied Physics,2003,93(09):5156-5160. |
| [11] | Qiwu Zhang;Jim Wang;Shu Yin;Tsugio Sato;Fumio Saito .Synthesis of a Visible-Light Active TiO{sub}(2-x)S{sub}x Photocatalyst by Means of Mechanochemical Doping[J].Journal of the American Ceramic Society,2004(6):1161-1163. |
| [12] | GOMEZ R;LOPEZ T;ORTIZ-ISLAS E;NAVARRETE J SANCHEZ E TZOMPANZTZI F BOKHIMI X .Effect of sulfation on the photoaetivity of TiO2 sol-gel derived catalysts[J].Journal of Molecular Catalysis A:Chemical,2003,193:217-226. |
| [13] | MIAO L;TANEMURA S;TOH S;WATANABF H TOH S KANEKO K .Structural and compositional characterization of N2-H2 plasma surfae-treated TiO thin films[J].Applied Surface Science,2005,244:421-417. |
| [14] | OHNO T;AKIYOSH I M;UMEBAYASHI T;ASAI K MITSUI T MATSUMURU M .Preparation of S-doped TiO2 phtocatalysts and their phtocatalytic activities under visible light[J].Applied Catalysis A:General,2004,265:115-121. |
| [15] | 李立清,刘宗耀,唐新村,唐琳,郭三霞,李海龙,何益波.B/Fe2O3共掺杂纳米TiO2可见光下的催化性能[J].中国有色金属学报,2006(12):2098-2103. |
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