Photodecomposition of Methylene Blue by TiO2-mounted Diatomite

doi:10.3724/SP.J.1077.2008.00657

Abstract

Abstract: TiO₂-mounted diatomite photocatalysts were prepared by a sol-gel method with diatomite support, a kind of natural biological diatomaceous silica earth. SEM observation shows that TiO₂ is well mounted on the surface of diatomite as films and some particles. Ti ₂-mounted diatomite decomposes efficiently methy1ene blue (MB) under UV irradiation. Within 36h irradiation, about 90％ MB is decomposed by TiO₂/diatomite photocatalyst. After 48h irradiation, MB is decomposed almost completely (about 98％). However only 35％ MB is decomposed by pure diatomite after 48h irradiation. With the increasing heat-treatment temperatures, the photocatalytic activity of the TiO₂/diatomite is increased with the formed anatase type of TiO₂ increasing, but decreased with rutile type of TiO₂ formed at 700℃ and 900℃. Adding H₂O₂ in MB solution can improve the efficiency of the TiO₂-mounted diatomite photocatalysts greatly.

Key words: diatomite, TiO₂, photocatalyst, methylene blue

CLC Number:

TB321
TD985

CHUAN Xiu-Yun,LU Xian-Chun,LU Xian-Chu. Photodecomposition of Methylene Blue by TiO₂-mounted Diatomite[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00657.

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Photodecomposition of Methylene Blue by TiO₂-mounted Diatomite

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