High-temperature hydrothermal synthesis of crystalline mesoporous TiO2 with superior photo catalytic activities

• Published in: Applied surface science Vol. 258; no. 19; pp. 7448 - 7454
• Main Authors: Liu, Fujian, Liu, Chun-Lin, Hu, Baowei, Kong, Wei-Ping, Qi, Chen-Ze
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 15-07-2012; Elsevier
• Subjects: Catalytic activity; Complex bond interaction; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Crystal structure; Crystalline mesoporous TiO2; Exact sciences and technology; High temperature synthesis; Photo catalysis; Physics; Recyclability; Self assembly; Surface area; Titanates; Titanium dioxide; Walls; High temperature synthesis; Crystalline mesoporous TiO2; Photo catalysis; Complex bond interaction; Recyclability; Inorganic compounds; Hydrothermal synthesis; Porous materials; Transition element compounds; Catalysis; Titanium oxide; Crystalline mesoporous TiO; Mesoporosity
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2012.04.059

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► Crystalline mesoporous TiO2 was successfully synthesized at high temperature. ► Novel complex bond interaction results in stable mesopores. ► High-temperature hydrothermal condition can enhance crystallization of TiO2. ► Crystallized mesoporous TiO2 were photo catalytically active in both oxidation and reduction.
Mesoporous titanium dioxide with crystalline mesopore walls (M-TiO2-ns) have been successfully synthesized through the self-assembly of poly 4-Vinylpyridine template and tetrabutyl titanate precursor based on their complex bond interaction under high temperature (180°C) hydrothermal conditions. X-ray diffraction shows that M-TiO2-ns have highly crystalline mesopore walls with anatase phase characters; N2 sorption–desorption isotherms, SEM and TEM images show that M-TiO2-ns have high BET surface areas (85 and 120m2/g, respectively), large pore volumes (0.32 and 0.34cm3/g, respectively) and crystalline mesopore walls, which exhibit monolithic morphology with crystal sizes around 3–5μm. Interestingly, M-TiO2-ns exhibit much higher catalytic activities and good recyclability in both induced reduction of decabromodiphenyl and oxidation of Rhodamine B under UV light than those of nonporous crystalline TiO2 and M-TiO2 templated by hydrocarbon surfactant of F127, which is even comparable with that of commercial P25. Combination of the unique characters such as crystallinity, stable mesostructure, large BET surface areas and superior photo catalytic activities make M-TiO2-ns a kind of potentially important material for removing of organic pollutions in environment through green photo irradiation processes.