title: Excellent photocatalytic degradation activities of ordered mesoporous anatase TiO2-SiO2 nanocomposites to various organic contaminants.
abstract: Ordered 2-D hexagonal mesoporous TiO(2)-SiO(2) nanocomposites consisted of anatase TiO(2) nanocrystals and amorphous SiO(2) nanoparticles, with large mesochannels and high specific surface areas, have been extensively and detailedly evaluated using various cationic dyes (methylene blue, safranin O, crystal violet, brilliant green, basic fuchsin and rhodamine-6G), anionic dyes (acid fuchsin, orange II, reactive brilliant red X3B and acid red 1) and microcystin-LR. We use mesoporous 80TiO(2)-20SiO(2)-900 for the degradation of cationic dyes and MC-LR, due to the dominant adsorption of SiOH groups and synergistic role of coupled adsorption and photocatalytic oxidation. For anionic dyes, due to the adsorption results predominantly from TiOH groups, our strategy realizes the enhanced photocatalytic oxidation by strong surface acids and larger available specific surface area. Based on this, we prepared 90TiO(2)-10SiO(2)-700 to degrade them. The results show that our samples exhibit excellent degradation activities to all the contaminants, which are much higher than that of P25 photocatalyst. The dyes are not only decolorized promptly but degraded readily as well. It is strongly indicated that our mesoporous nanocomposites are considerably stable and reusable. These results demonstrate that our mesoporous TiO(2)-SiO(2) nanocomposites present extensive and promising application in the fast and highly efficient degradation of various organic pollutants.
authors: Department of Environmental Science and Engineering, Fudan University, 220 Handan Road, Shanghai 200433, PR China. wydong@fudan.edu.cn
authors: Weiyang
authors: W
authors: Dong
authors: Yaojun
authors: Y
authors: Sun
authors: Qingwei
authors: Q
authors: Ma
authors: Li
authors: L
authors: Zhu
authors: Weiming
authors: W
authors: Hua
authors: Xinchun
authors: X
authors: Lu
authors: Guoshun
authors: G
authors: Zhuang
authors: Shicheng
authors: S
authors: Zhang
authors: Zhigang
authors: Z
authors: Guo
authors: Dongyuan
authors: D
authors: Zhao
mesh_terms: D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D008387:Marine Toxins; D052998:Microcystins / Q000737:chemistry*; D053761:Nanocomposites / Q000737:chemistry / Q000528:radiation effects; D010084:Oxidation-Reduction; D055668:Photochemical Processes; D010782:Photolysis; D012822:Silicon Dioxide / Q000737:chemistry* / Q000528:radiation effects; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014466:Ultraviolet Rays; D014873:Water Pollutants / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D004396:Coloring Agents; D008387:Marine Toxins; D052998:Microcystins; D014873:Water Pollutants; C009495:titanium dioxide; D012822:Silicon Dioxide; D014025:Titanium; C057862:cyanoginosin LR