Enhanced Photocatalytic Activity of Powders (P25) via Calcination Treatment | Zendy

Guohong Wang | Zendy; Lin Xu | Zendy; Jun Zhang | Zendy; Tingting Yin | Zendy; Deyan Han | Zendy

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Enhanced Photocatalytic Activity of Powders (P25) via Calcination Treatment

Author(s) -

Guohong Wang,

Lin Xu,

Jun Zhang,

Tingting Yin,

Deyan Han

Publication year - 2012

Publication title -

international journal of photoenergy

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.426

H-Index - 51

eISSN - 1687-529X

pISSN - 1110-662X

DOI - 10.1155/2012/265760

Subject(s) - calcination , photocatalysis , materials science , methyl orange , anatase , crystallinity , aqueous solution , chemical engineering , crystallization , high resolution transmission electron microscopy , muffle furnace , nuclear chemistry , nanotechnology , chemistry , catalysis , organic chemistry , composite material , transmission electron microscopy , engineering

P25 TiO2 powders were calcined at different temperatures in a muffle furnace in air. The P25 powders before and after calcination treatment were characterized with XRD FTIR, UV-visible diffuse reflectance spectra, SEM, TEM, HRTEM, and N2 adsorption-desorption measurements. The photocatalytic activity was evaluated by the photocatalytic oxidation of methyl orange aqueous solution under UV light irradiation in air. The results showed that calcination treatment obviously influenced the microstructures and photocatalytic activity of the P25 TiO2 powders. The synergistic effect of the phase structure, BET surface area, and crystallinity on the photocatalytic of TiO2 powders (P25) after calcination was investigated. An optimal calcination temperature () was determined. The photocatalytic activity of TiO2 powders calcined at was nearly 2 times higher than that of the uncalcined P25 TiO2. The highest photocatalytic activities of the calcined samples at for 4 h might be ascribed to the enhancement of anatase crystallization and the optimal mass ratio (ca. 1 : 2) of rutile to anatase

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