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Synthesis, characterization and photoactivity of bi-crystalline mesoporous TiO2

Frontiers of Materials Science 2016年第1期10卷 23-30页

作者： dongthanh nguyen Wei WANG Haibo LONG Hongqiang RU Key Laboratory for Anisotropy and Texture of Materials of Ministry of Education (ATM) Northeastern University Shenyang 110819 China School of Materials and Metallurgy Northeastern University Shenyang 110819 China

Mesoporous titania （meso-TiO2） has received extensive attention owing to its versatile potential applications. This paper reports a low-temperature templating approach for the fabrication of meso-TiO2 using the peroxo titanic acid （PTA） sol as precursor and Pluronic P123 as nonionic template. The TGA, XRD, N2 sorption, FE-SEM and HRTEM were used to characterize the obtained samples. The results showed that meso-TiO2 with high surface area up to 163 m2.g^-1 and large pore volume of 0.65 cm3.^-1 can be obtained. The mesopore sizes can be varied between 13 and 20 nm via this synthesis approach. The amount of P123 and the calcination conditions were found to have great influence on the mesoporous and crystalline structures of meso-TiO2. The photocatalytic activity testing clearly shows that the high surface area and bi-crystallinity phases of meso-TiO2 play important roles in enhancing photocatalytic properties of meso-TiO2 in photo-decomposing Rhodamine B in water.

关键词： surfactant templating mesopore bi-crystallinity titania

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Facile and controllable preparation of mesoporous TiO2 using poly（ethylene glycol） as structure-directing agent and peroxotitanic acid as precursor

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Frontiers of Materials Science 2016年第4期10卷 405-412页

作者： dongthanh nguyen Wei WANG Haibo LONG Hongqiang RU Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Materials Science and Engineering Northeastern University Shenyang 110819 China

This work demonstrated that mesoporous TiO= （meso-TiO2） with con- trollable mesoporous and crystalline structures can be facilely prepared by using poly （ethylene glycol）（PEG） as structure-directing （SD） agent and peroxotitanic acid （PTA） as precursor. Meso-TiO2 with high specific surface area （157 m2.g-1）, pore volume （0.45 cm3.g-1） and large mesopore size of 13.9 nm can be obtained after calcination at 450℃. Such meso-TiO2 also shows relatively high thermal stability. BET surface area still reaches 114 m2-g-1 after calcination at 550℃. In the synthesis and calcination process, PEG that plays multiple and important roles in delivering thermally stable and tunable mesoporous and crystalline structures shows to be a suitable low-cost SD agent for the controllable preparation of nanocrystalline meso-TiO2. The photocataiytic activity tests show that both high surface area and bi-crystallinity of obtained meso-TiO2 are important in enhancing the performance in photo-decomposing Rhodamine B in water.

关键词： sol-gel preparation mesoporous titania poly(ethylene glycol)

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