采用化学沉淀法制备Cr3＋掺杂TiO2粉体,通过正交实验优化制备工艺,采用 XRD、XPS和 UV-Vis 对TiO2粉体的结构、表面状态和光吸收性能等进行了表征.结果表明,Cr3＋掺杂量对 TiO2粉体光吸收性能影响最为显著,随着Cr3＋掺杂量的增加,TiO2的光吸收能力增强,禁带宽度减小；Cr3＋掺杂能部分取代Ti4＋,促进锐钛矿相向金红石相的转变,同时导致TiO2表面吸附一定数量的羟基.最优的制备条件为 Cr3＋掺杂量1．0％(摩尔分数),煅烧温度500℃,反应温度为70℃,反应液pH 值为10．0,此条件下获得的TiO2粉体可见光性能最优.
Cr3+ doped TiO2 powder was prepared by chemical precipitation and the technique was optimized by orthogonal experiment.The structure,surface state and light absorption properties of TiO2 powders were char-acterized by XRD、XPS and UV-Vis.The results showed that the effect of the amount of Cr3+ on optical absorp-tion properties of TiO2 were significant.With the rising of Cr3+ amount,optical absorption properties of TiO2 increase and band gaps decrease.Cr3+ partially substitutes Ti4+ and promotes the phase transformation from an-atase to rutile.In addition,a certain amounts of hydroxyls are also adsorbed on the surface of TiO2 due to Cr3+doping.The optimal conditions of Cr3+ doped TiO2 powder were as follows:the amount of Cr3+ is 1.0mol%, the calcinated temperature is 500 ℃,the solution temperature is 70 ℃ and the pH value is 10.0.TiO2 powder prepared under the above conditions had the optimal visible light property.
参考文献
| [1] | 崔玉民.影响纳米材料TiO2光催化活性的因素[J].稀有金属,2006(01):107-113. |
| [2] | Kment, S.;Kmentova, H.;Kluson, P.;Krysa, J.;Hubicka, Z.;Cirkva, V.;Gregora, I.;Solcova, O.;Jastrabik, L..Notes on the photo-induced characteristics of transition metal-doped and undoped titanium dioxide thin films[J].Journal of Colloid and Interface Science,20101(1):198-205. |
| [3] | Yoshiteru Mizukoshi;Naofumi Ohtsu;Satoshi Semboshi.Visible light responses of sulfur-doped rutile titanium dioxide photocatalysts fabricated by anodic oxidation[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20091/2(1/2):152-156. |
| [4] | Carneiro, JO;Teixeira, V;Martins, AJ;Mendes, M;Ribeiro, M;Vieira, A.Surface properties of doped and undoped TiO2 thin films deposited by magnetron sputtering[J].Vacuum: Technology Applications & Ion Physics: The International Journal & Abstracting Service for Vacuum Science & Technology,200910(10):1303-1306. |
| [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,20031/2(1/2):505-516. |
| [6] | Pan CC;Wu JCS.Visible-light response Cr-doped TiO2-N-X(X) photocatalysts[J].Materials Chemistry and Physics,20061(1):102-107. |
| [7] | Shuai Yuan;Qiaorong Sheng;Jinlong Zhang.Synthesis of thermally stable mesoporous TiO2 and investigation of its photocatalytic activity[J].Microporous and mesoporous materials: The offical journal of the International Zeolite Association,20082/3(2/3):501-507. |
| [8] | Jiefang Zhu;Zhigang Deng;Feng Chen;Jinlong Zhang;Haijun Chen.Hydrothermal doping method for preparation of Cr~(3+)-TiO_2 photocatalysts with concentration gradient distribution of Cr~(3+)[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,20063/4(3/4):329-335. |
| [9] | 刘昭麟;崔作林;张志焜.Cr3+掺杂纳米TiO2结构相变及光谱特征[J].功能材料,2005(9):1404-1408. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%