以硝酸钇和钛酸四丁酯为原料,采用溶胶-凝胶法制备了Y-TiO2光催化剂粉体。以 XRD、DSC-TGA、FT-Raman、UV-Vis、PL 等手段对样品进行表征,研究了不同制备条件对样品性能的影响,并以亚甲基蓝(MB)作为目标降解物,研究了其光催化性能。结果表明,钇掺杂可以减缓样品由锐钛矿相向金红石相的转变,拓展了TiO2在可见光区的光谱响应范围,降低了光生电子和空穴的复合几率；当 Y∶TiO2的摩尔比为0.6%,500℃条件下焙烧4 h 制备的样品催化性能最好,在普通日光灯下3 h 内对 MB 的降解率达97.32%,显著高于同等实验条件下的 Degussa P25(58.62%)。
Yttrium doped TiO2 photocatalysts were synthesized by sol-gel process using yttrium nitrate and tetra-butyl titanate as precursors and characterized by XRD,DSC-TGA,FT-Raman,UV-Vis and PL methods.The in-fluences of different preparation condition on properties were studied.The photocatalytic activity of Y-TiO2 was investigated by measuring the degradation rate of methylene-blue (MB)under the irradiation of fluorescent lamp.The results show that yttrium doping can not only inhibit the phase transition of anatase to rutile but also broaden the absorption region to visible light and inhibit the recombination of the photo-generated electrons and holes.The photocatalytic activity of the sample with molar ratio of Y∶TiO2=0.6% and sintered at 500 ℃ for 4 h was the best under the irradiation of fluorescent light,it was 97.32% within 3 h and significantly higher than that of Degussa P25(58.62%)under the same experimental conditions.
参考文献
| [1] | Gole J L;Stout J D;Burda C et al.Highly efficient forma-tion of visible light tunable TiO2-x Nx photocatalysts and their transformation at the nanoscale[J].The Journal of Physical Chemistry(B)Materials Surfaces Interfaces & Physical,2004,108(04):1230-1240. |
| [2] | Tang JW;Durrant JR;Klug DR .Mechanism of photocatalytic water splitting in TiO2. Reaction of water with photoholes, importance of charge carrier dynamics, and evidence for four-hole chemistry[J].Journal of the American Chemical Society,2008(42):13885-13891. |
| [3] | Yanakata A;Ishibashi T;Onoshi H J .Electron-and hole-capture reactions on Pt/TiO2 photocatalysts exposed to methanol vapor studied with time-resolved infrared ab-sorption spectroscopy[J].The Journal of Physical Chem-istry B,2002,106(35):9122-9125. |
| [4] | A. Di Paola;G. Marci;L. Palmisano;M. Schiavello;K. Uosaki;S. Ikeda;B. Ohtani .Preparation of Polycrystalline TiO_2 Photocatalysts Impregnated with Various Transition Metal Ions: Characterization and Photocatalytic Activity for the Degradation of 4-Nitrophenol[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2002(3):637-645. |
| [5] | Shigehito Deki;Kentaro Kuratani;Masayasu Uemura;Kensuke Akamatsu;Minoru Mizuhata;Akihiko Kajinami .Aqueous solution-based synthesis of rare earth-doped metal oxide thin films[J].Thin Solid Films: An International Journal on the Science and Technology of Thin and Thick Films,2004(1/2):83-86. |
| [6] | Kapoor M P;Ichihasii Y;Kuraoka K et al.Catalytic meth-anol decomposition over palladium deposited on thermally stable mesoporous titanium oxide[J].Journal of Molecular Catalysis A:Chemical,2003,198(1-2):303. |
| [7] | Hiroaki Tada;Akihiko Hattori;Yoshifumi Tokihisa;Kiyohisa Imai;Noboru Tohge;Seishiro Ito .A Patterned-TiO_2/SnO_2 Bilayer Type Photocatalyst[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2000(19):4585-4587. |
| [8] | Cho Y M;Choi W Y .Visible light-induced degradation of carbon tetrachloride on dye-sensitized TiO2[J].Environmental Science and Technology,2001,35(05):966-970. |
| [9] | Low temperature biomimetic synthesis of the Li_2ZrO_3 nanoparticles containing Li_6Zr_2O_7 and high temperature CO_2 capture[J].Materials Letters,2010(12):p.1404. |
| [10] | 王振华,主沉浮,蔡元兴,姜茂芹.掺杂改性纳米TiO2光催化剂的作用机理及改性途径[J].材料导报,2006(z2):61-63. |
| [11] | 吴忠杰,万涛,吴秀玲.掺钇纳米二氧化钛光催化降解甲基橙的研究[J].应用化工,2007(12):1221-1223. |
| [12] | 刘月,余林,魏志钢,潘湛昌,邹燕娣,谢英豪.稀土金属掺杂对锐钛矿型TiO2光催化活性影响的理论和实验研究[J].高等学校化学学报,2013(02):434-440. |
| [13] | 孟庆裕,陈宝玖,许武,赵晓霞,杨艳民,狄卫华,王晓君.Y2O3纳米晶体中Ln3+（Ln=Tb,Tm,Eu）发光浓度猝灭及能量传递的研究[J].光谱学与光谱分析,2009(01):151-155. |
| [14] | Na Wei;Zhu Zhongqi;Zhang Jin et al.Study on proper-ties of the anatase nano-TiO2 sol[J].Journal of Func-tional Materials,2006,37(11):1822-1824. |
| [15] | 陈晓淼,张鹏,汤建庭,彭振山,罗联璟,邓谦.稀土改性TiO催化剂的制备及光催化消除甲醇[J].湖南科技大学学报（自然科学版）,2011(03):106-111. |
| [16] | 李姝丹,井立强,付宏刚.不同晶相组成TiO2纳米粒子的拉曼光谱表征及其光催化性能[J].黑龙江大学自然科学学报,2007(02):241-244. |
| [17] | 王建强,辛柏福,于海涛,谢玉涛,赵冰,付宏刚.二氧化钛系列光催化剂的拉曼光谱[J].高等学校化学学报,2003(07):1237-1240. |
| [18] | Fujihara Kan .Time-resolved photoluminescence of particulate TiO_2 photocatalysts suspended in aqueous solutions[J].Journal of Photochemistry and Photobiology, A. Chemistry,2000(1/2):99-104. |
| [19] | 高伟,吴凤清,罗臻,富菊霞,王德军,徐宝琨.TiO2晶型与光催化活性关系的研究[J].高等学校化学学报,2001(04):660-662. |
| [20] | 尹红伟,陈吉祥,张继炎.焙烧及还原温度对对硝基苯酚加氢合成对氨基苯酚Ni/TiO2催化剂性能的影响[J].催化学报,2007(05):435-440. |
| [21] | 丁欣宇,景晓辉,施磊,胡震超,贾海峰.掺杂钇的纳米TiO2的制备及光催化性能研究[J].南通大学学报（自然科学版）,2008(02):44-46,72. |
| [22] | Ranjite K T;Willner I;Bossmann S H et al.Lanthanide oxide doped titanium dioxide photocatalysts:effective photocatalysts for the enhanced degradation of salicylic acid and t-cinnamic acid[J].Journal of Catalysis,2001,204(02):305-313. |
| [23] | Feng Liangrong;Lv Shaojie;Qiu Fali .Influence of transi-tion elements dopant on the photocatalystic activities of nanometer TiO2[J].Journal of Fudan University(Natu-ral Science),2003,42(03):413-413. |
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