硅藻土是一种天然生物成因的SiO2. 采用硅藻土做载体,用溶胶-凝胶法制备TiO2/硅藻土复合光催化剂,TiO2呈薄膜状负载在硅藻土上,部分团聚成颗粒状. 在紫外光条件下负载TiO2硅藻土对亚甲基蓝具有良好的光催化降解性能,36h后对亚甲基蓝的脱除率为90%, 48h达到98%, 降解效果好. 纯硅藻土48h后对亚甲基蓝的脱除率仅为35%左右. 负载TiO2硅藻土对亚甲基蓝的光降解性能受TiO2的同质多像结构影响. 随着锐钛矿含量增加, 负载TiO2硅藻土的光降解性能增强. 但是, 当温度进一步升高, TiO2由锐钛矿型转化为金红石型, 负载TiO2硅藻土的光降解性能随之降低. 添加H2O2明显提高亚甲基蓝溶液的降解效果.
TiO2-mounted diatomite photocatalysts were prepared by a sol-gel method with diatomite support, a kind of natural biological diatomaceous silica earth. SEM observation shows that TiO2 is well mounted on the surface of diatomite as films and some particles. Ti 2-mounted diatomite decomposes efficiently methy1ene blue (MB) under UV irradiation. Within 36h irradiation, about 90% MB is decomposed by TiO2/diatomite photocatalyst. After 48h irradiation, MB is decomposed almost completely (about 98%). However only 35% MB is decomposed by pure diatomite after 48h irradiation. With the increasing heat-treatment temperatures, the photocatalytic activity of the TiO2/diatomite is increased with the formed anatase type of TiO2 increasing, but decreased with rutile type of TiO2 formed at 700℃ and 900℃. Adding H2O2 in MB solution can improve the efficiency of the TiO2-mounted diatomite photocatalysts greatly.
参考文献
[1] | |
[2] | 徐志兵, 孔学军, 余锦龙, 等.稀有金属, 2007, 31 (1): 92--97. [2] Hoffmann M R, Martin S T, Choi W, et al. Chem. Rev., 1995, 95 (1): 69--96. [3] Chuan Xiu-Yun, Masanori Hirano, Michio Inagaki. Appl. Catal. B: Environ., 2004, 51 (4): 255--260. [4] 传秀云, 卢先初, 龚平.地学前缘, 2005, 12 (1): 188--195. [5] Lu Xian-Chu, Chuan Xiu-Yun, Wang Ai-Ping, et al. Acta Geologica Sinica, 2006, 80 (2): 278--284. [6] Liu Gui-Yang, Kang Fei-Yu, Li Bao-Hua, et al. J. Phys. Chem. Solids, 2006, 67 (5-6): 1186--1189. [7] 卢先初.管状矿物埃洛石/TiO2复合材料降解亚甲基蓝的实验研究.北京大学硕士论文, 2006. [8] Hidalgo M C, Bahnemann D. Appl. Catal. B: Environ., 2005, 61 (3/4): 259--266. [9] 王利剑, 郑水林, 舒锋.中国建材科技, 2006, 15 (3): 99--102. [10] Martirosyan G G, Manukyan A G, Ovsepyan E B, et al. Russ. J. Appl. Chem., 2003, 76 (4): 531--535. [11] 陶维屏.中国工业矿物和岩石. 北京: 地质出版社, 1987. 406--408. [12] ChuanXiu-Yun. The structure, property and application of diatomite, The 5th Conference of Asian Biomedical Material Science and Technology, Hong Kong University of Science & |
- 下载量()
- 访问量()
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%