首页|Titania coated silica core-shell spheres with dual grain size as efficient photocatalysts
Titania coated silica core-shell spheres with dual grain size as efficient photocatalysts
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NSTL
The TiO2 nanoclusters were modified into the pores of silica core-shell particles(SiO2@dSiO2)by the sol-gel method,and the loading amount reached 47%.Based on the Ostwald ripening theory,by simply extending the reaction time,a part of the TiO2 in the pores of the shell was dissolved and then re-deposited on the outer surface of the shell to form a TiO2 layer.Using this method,TiO2 crystalline grains of different sizes were obtained simultaneously inside and outside the shell of silica core-shell spheres.Small-sized crystalline grains were located in the pores of the shell,and they had a strong quantum size effect.The large crystalline grains were located in the TiO2 layer on the outer surface of the shell of SiO2@dSiO2.Due to the formation of larger-sized crystalline grains,the recombination probability of photogenerated electron-hole pairs was reduced.When used as photocatalysts for the degradation of Rhodamine B under UV irradiation,the catalytic activity of SiO2@dSiO2@TiO2 was 5.4 times higher than that of the commercial P25 TiO2 photocatalyst.
Key Laboratory of Functional Molecule Design and Interface Process,Anhui Province Engineering Laboratory of Advanced Building Materials,School of Materials Science and Chemical Engineering Anhui Jianzhu University,Hefei,230601,China
Institute of Advanced Synthesis,School of Chemistry and Molecular Engineering Nanjing Tech University,Nanjing 211816,Jiangsu,PR China
NSTL
