Photodegradation of indigo carmine and methylene blue dyes in aqueous solution by SiC-TiO₂ catalysts prepared by sol-gel

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• 作者：Christian G&oacute ; mez-Sol&iacute ; s^a ; Isa&iacute ; as Juá ; rez-Ram&iacute ; rez^b ; ^{isajua13@yahoo.com} ; Edgar Moctezuma^a ; Leticia M. Torres-Mart&iacute ; nez^b
• 关键词：Photodegradation ; Indigo carmine ; Methylene blue ; SiC&ndash ; TiO2 ; Sol&ndash ; gel
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 May, 2012
• 卷：217-218
• 期：Complete
• 页码：194-199
• 文件大小：677 K

摘要

Indigo carmine and methylene blue dyes in aqueous solution were photodegraded using SiC-TiO₂ catalysts prepared by sol-gel method. After thermal treatment at 450 掳C, SiC-TiO₂ catalysts prepared in this work showed the presence of SiC and TiO₂ anatase phase. Those compounds showed specific surface area values around 22-25 m² g^鈭?, and energy band gap values close to 3.05 eV. In comparison with TiO₂ (P25), SiC-TiO₂ catalysts showed the highest activity for indigo carmine and methylene blue degradation, but this activity cannot be attributed to the properties above mentioned. Therefore, photocatalytic performance is due to the synergy effect between SiC and TiO₂ particles caused by the sol-gel method used to prepare the SiC-TiO₂ catalysts. TiO₂ nanoparticles are well dispersed onto SiC surface allowing the transfer of electronic charges between SiC and TiO₂ semiconductors, which avoid the fast recombination of the electron-hole pair during the photocatalytic process.