为了精确控制共沉淀包膜法制备掺杂TiO2粉体的反应条件,本文通过对Men＋（Ni2＋、La3＋、Fe3＋、Al3＋）在NaHCO3-NH3.H2O体系中离子沉淀反应平衡的热力学分析,得到了Men＋-CO32--NH3.H2O体系中不同总氨浓度cN和总碳浓度cC时各金属离子总浓度与pH值的关系图,并由此确定了金属离子完全沉淀的最佳pH值.热力学分析表明,以NaHCO3-NH3.H2O作为沉淀剂,采用共沉淀包膜法制备掺杂TiO2粉体时,当cN=0.010 mol/L和cC=1.000 mol/L时,反应的适宜沉淀pH为9.0左右.
To precisely control the reaction conditions of doped TiO2 powders prepared by coprecipitation-coat- ing process, the ions precipitation reaction equilibrium of Men+ ( Ni2+/La3+/Fe3+/A13+ ) in NaHCO3 - NH3 · H20 system was discussed by thermodynamic analysis in this paper. The relation curves be- tween total concentrations of each metal ion and pH value under different total ammonia concentrations cN and total carbon concentrations cc were obtained. Then,the suitable pH of complete precipitation for all metal ions was determined. The results show that when cN is 0. 010 mol/L,and cc is 1. 000 mol/L,the optimal pH is 9.0 to prepare the doped titanium dioxide powders by coprecipitation-coating process, and the precipitants are NaHCO3 and NH3·H2O.
参考文献
| [1] | Qinglei Wang;Guoda Lian;E1izabeth C. Dickey .Grain boundary segregation in yttrium-doped polycrystalline TiO_2[J].Acta materialia,2004(4):809-820. |
| [2] | Nowotny MK;Sheppard LR;Bak T;Nowotny J .Defect chemistry of titanium dioxide. application of defect engineering in processing of TiO2-based photocatalysts[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2008(14):5275-5300. |
| [3] | 王天国,覃群,周志刚.La2O3掺杂对TiO2系压敏陶瓷结构和性能的影响[J].电子元件与材料,2010(10):32-35. |
| [4] | Seo, MH;Yuasa, M;Kida, T;Huh, JS;Shimanoe, K;Yamazoe, N .Gas sensing characteristics and porosity control of nanostructured films composed of TiO2 nanotubes[J].Sensors and Actuators, B. Chemical,2009(2):513-520. |
| [5] | Jun Wang;Zhiqun Lin .Dye-Sensitized TiO2 Nanotube Solar Cells with Markedly Enhanced Performance via Rational Surface Engineering[J].Chemistry of Materials: A Publication of the American Chemistry Society,2010(2):579-584. |
| [6] | M. Uzunova-Bujnova;R. Todorovska;D. Dimitrov;D. Todorovsky .Lanthanide-doped titanium dioxide layers as photocatalysts[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2008(22):7296-7302. |
| [7] | 韦志仁,刘新辉,武明晓,彭翔宇,李志强.水热合成长叶片状锐钛矿相TiO2纳米晶[J].人工晶体学报,2010(03):691-695. |
| [8] | Doong, RA;Chang, PY;Huang, CH .Microstructural and photocatalytic properties of sol-gel-derived vanadium-doped mesoporous titanium dioxide nanoparticles[J].Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites,2009(45/47):2302-2308. |
| [9] | 卢晗锋,袁泉东,黄海凤,陈银飞,刘化章.共沉淀法制备多孔TiO2-SiO2复合氧化物的结构特点[J].材料科学与工程学报,2008(05):713-715,738. |
| [10] | Transition metal ions effect on the properties and photocatalytic activity of nanocrystalline TiO_2 prepared in an ionic liquid[J].Journal of hazardous materials,2009(2/3):1573. |
| [11] | 闫龙,史志铭,金丽娜.稀土掺杂氧化钛基材料的相变及其湿度-电阻关系[J].人工晶体学报,2007(02):480-483,479. |
| [12] | GAO Jia-cheng,ZOU Jian,TAN Xiao-wei,WANG Yong.Characteristics and properties of surface coated nano-TiO2[J].中国有色金属学会会刊（英文版）,2006(06):1252-1258. |
| [13] | 雷景轩,马学鸣,朱丽慧.液相包覆技术及其在材料制备中的应用[J].材料科学与工程,2002(01):93-96. |
| [14] | 王兰义,职建中,李永祥,胡述涛,侯国文.固相法与共沉淀包膜法制备氧化锌非线性电阻陶瓷粉体的比较[J].电瓷避雷器,2002(02):44-48. |
| [15] | 郭方方,林枞,徐政,孙丹峰.共沉淀纳米掺杂制备ZnO压敏电阻数学模拟[J].同济大学学报(自然科学版),2008(01):62-65,107. |
| [16] | 李波.金属碳酸盐沉淀过程的热力学分析[J].稀有金属与硬质合金,2005(02):4-8. |
| [17] | 蔡进红,代建清,周小兵.共沉淀法合成Zn掺杂Co2-Y平面六角铁氧体粉的热力学分析[J].无机化学学报,2008(12):1943-1948. |
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