Photocatalytic Activities of TiO2 Coated on Different Semiconductive SiC Foam Supports
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第11期
论文作者：Dong Hao Zhenming Yang Chunhai Jiang Jinsong Zhang
文章页码：1074 - 1078
摘 要：Different semiconductive SiC foam supports were prepared by varying the sintering temperature and atmosphere,and with or without alkaline solution treatment and high temperature oxidation following a macromolecule pyrogenation combined with reaction bonding method.Nano-TiO2 particles were immobilized onto these SiC foam supports by a composite sol—gel method.The phase,surface morphology,the type of conduction and the photocatalytic activity of the TiO2—SiC composite photocatalysts were studied.The TiO2coated on p-type Si-free SiC support showed the highest photocatalytic efficiency in degradation of 4-aminobenzenesulfonic acid（4-ABS） in aqueous solution as compared to that coated on n-type SiC support and p-type SiC supports with residual Si or SiO2 on the surface.The result showed that the TiO2 coatings immobilized on p-type semiconductive SiC foam supports exhibited obviously higher photocatalytic activity in comparison to that coated on n-type SiC foam support.The p—n heterojunctions formed between the p-type SiC supports and n-type TiO2 coatings might be able to account for the better charge separation and transfer as well as the photocatalytic activity of the TiO2—SiC composite photocatalyst.
Dong Hao1,2，Zhenming Yang1，Chunhai Jiang1，Jinsong Zhang1
1. Institute of Metal Research,Chinese Academy of Sciences2. University of Chinese Academy of Sciences
摘 要：Different semiconductive SiC foam supports were prepared by varying the sintering temperature and atmosphere,and with or without alkaline solution treatment and high temperature oxidation following a macromolecule pyrogenation combined with reaction bonding method.Nano-TiO2 particles were immobilized onto these SiC foam supports by a composite sol—gel method.The phase,surface morphology,the type of conduction and the photocatalytic activity of the TiO2—SiC composite photocatalysts were studied.The TiO2coated on p-type Si-free SiC support showed the highest photocatalytic efficiency in degradation of 4-aminobenzenesulfonic acid（4-ABS） in aqueous solution as compared to that coated on n-type SiC support and p-type SiC supports with residual Si or SiO2 on the surface.The result showed that the TiO2 coatings immobilized on p-type semiconductive SiC foam supports exhibited obviously higher photocatalytic activity in comparison to that coated on n-type SiC foam support.The p—n heterojunctions formed between the p-type SiC supports and n-type TiO2 coatings might be able to account for the better charge separation and transfer as well as the photocatalytic activity of the TiO2—SiC composite photocatalyst.
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