以钛酸四丁酯,La2O3和Ce(NO3)3@6H2O为原料,采用溶胶-凝胶法制备了纯的和分别掺杂5mol%镧和铈的TiO2纳米粒子,并利用XRD,TG-DTA,TEM和XPS等测试技术对样品的晶型、尺寸和形貌等进行了表征,主要考察了镧和铈的掺杂对TiO2的晶粒尺寸和锐钛矿→金红石结构相变的影响,并初步的探讨了镧和铈的作用机理.结果表明,600℃焙烧而获得的TiO2纳米粒子具有与P-25型TiO2粒子相类似的组成、结构、形貌和粒子尺寸;掺杂剂镧和铈分别以La2O3和CeO2小团簇形式存在,并比较均匀的弥散在TiO2纳米粒子中,二者的掺杂抑制了锐钛矿晶粒的增长和锐钛矿→金红石的结构相变,使相变温度显著提高,晶格畸变增大,而镧比铈的作用更加显著.镧和铈的作用机理可能主要与掺杂离子的半径和价态以及稀土氧化物的存在和熔点等有关.
参考文献
| [1] | Akira Fujishima;Tata N. Rao;Donald A. Tryk .Titanium dioxide photocatalysis[J].Journal of photochemistry and photobiology, C. Photochemistry reviews,2000(1):1-21. |
| [2] | Murata Y.;Ishikawa S.;Yokoyama S.;Fukuta S. .Photoelectrochemical properties of TiO2 rutile microalloyed with 4d and 5d transition elements[J].Solar Energy Materials and Solar Cells: An International Journal Devoted to Photovoltaic, Photothermal, and Photochemical Solar Energy Conversion,2000(1/2):157-165. |
| [3] | Ki Hyun Yoon;Jung Cho;Dong Heon Kang .PHYSICAL AND PHOTOELECTROCHEMICAL PROPERTIES OF THE TiO_2ZnO SYSTEM[J].Materials Research Bulletin: An International Journal Reporting Research on Crystal Growth and Materials Preparation and Characterization,1999(9):1451-1461. |
| [4] | 韩兆慧,赵化侨.半导体多相光催化应用研究进展[J].化学进展,1999(01):1-10. |
| [5] | 徐薇,徐江兴,廖飞凤,韩强.室内丙酮气体的TiO2/UV光催化氧化[J].哈尔滨工业大学学报,2003(12):1449-1451. |
| [6] | Litter M I .Heterogeneous photocatalysis:Transition metal ions in photocatalytic system[J].Applied Catalysis B:Environmental,1999,23(2-3):89-114. |
| [7] | 井立强,孙晓君,蔡伟民,孙德智,王志平,李晓倩.纳米粒子TiO2/Ti膜的制备及其光催化活性[J].哈尔滨工业大学学报,2002(06):820-825. |
| [8] | Michael R. Hoffmann;Scot T. Martin;Wonyong Choi;Detlef W. Bahnemann .Environmental Applications of Semiconductor Photocatalysis[J].Chemical Reviews,1995(1):69-96. |
| [9] | Fox M A;DULAY M T .Heterogeneous Photocatalysis[J].Physical Chemistry,1993,93(01):341-357. |
| [10] | 丁星兆;罗菊 .粒径尺寸对TiO2纳米粉结构相变的影响[J].无机材料学报,1993,8(01):114-119. |
| [11] | 袁志好,张立德.掺锌的TiO2纳米粉的结构相变及发光性质[J].高等学校化学学报,1999(07):1007-1011. |
| [12] | Ding X Z;QI Z Z;HE Y Z .Effect of tin dioxide on rutile phase formation in sol-gel-derived nanocrystalline titania powders[J].Journal of Materials Science Letters,1994,4(06):663-668. |
| [13] | DingXZ;LIU L;MAXM et al.The influence of alumina dopant on the structural transformation of sol-gel-derived nanocrystalline titania powders[J].Journal of Materials Science Letters,1994,13:462-467. |
| [14] | 岳林海;水淼 .稀土掺杂二氧化钛的光催化活性[J].浙江大学学报(理学版),2001,27(01):69-74. |
| [15] | 于向阳,程继健,杜永娟.稀土元素掺杂对TiO2相组成和光催化性能的影响[J].玻璃与搪瓷,2000(02):15-20,25. |
| [16] | 梁金生,金宗哲,王静,王毅敏.环境净化功能M/TiO2纳米材料光催化活性的研究[J].硅酸盐学报,1999(05):601-604. |
| [17] | 曹锡章;张畹蕙;杜尧国.无机化学[M].北京:高等教育出版社,1991:520-540. |
| [18] | Zhang Q H;GAO L .Effects of calcinations on the photocatalytic properties of nanosized TiO2 powders prepared by TiCI4 hydrolysis[J].Applied Catalysis B:Environmental,2000,26(03):207-215. |
| [19] | 尹荔松;周歧发;唐新桂 .纳米粉晶的XRD研究[J].功能材料,1999,30(05):498-500. |
| [20] | Jing LQ.;Sun XJ.;Shang J.;Cai WM.;Xu ZL. .The surface properties and photocatalytic activities of ZnO ultrafine particles[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2001(3/4):308-314. |
| [21] | Xu Z L;SHANG J .The preparation and characterization of TiO2 ultrafine particles[J].Materials Science and Engineering B,1999,63(03):211-214. |
| [22] | Rodriguez-Talaveraa R;VARGAS S.Modification of the phase Transition Temperature in Titania Doped with Various Cations[J].Journal of Materials Research,1997(12):439-442. |
| [23] | Lin Jun;YU J C .An investigation on photocatalytic activities of mixed TiO2-rare earthoxides for the oxidation of acetone in air[J].Journal of Photochemistry and Photobiology A:Chemistry,1998,116(01):63-67. |
| [24] | Lawrence H E;ANDREAS M G .Role of Particle Substructure in the Sintering of Nanosized Titania[J].Journal of the American Ceramic Society,1988,71(01):225-235. |
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