Photodecomposition of Methylene Blue by the S, Al Doped TiO₂ Mesoporous Materials

Abstract:

Mesoporous sulfur, aluminium doped TiO₂ materials (S-Al-TiO₂, S-TiO₂, Al-TiO₂) have been synthesized by solid-state reaction route. The textural properties of the samples are monitored by the X-ray diffraction (XRD), Scanning electron micrography (SEM), Fourier transform infrared spectroscopy (FT-IR), ultraviolet visible light spectroscopy (UV-Vis) and N₂-physisorption. Moreover, compared with the pure TiO₂, the photodecomposition properties of methylene blue (MB) irradiated with ultraviolet and visible light are presented on the doped TiO₂ materials. It is shown that TiO₂ doped by sulfur and /or aluminium are mesoporous materials, and the S and Al enter into the crystal lattice of TiO₂. At 298K, the rule of pseudo-first-order reaction and excellent visible light catalytic activity are obtained in the photodecomposition of MB on the S-Al-TiO₂, S-TiO₂, Al-TiO₂ and pure TiO₂ materials. Interestingly, the reaction rate constant of MB on the S-Al-TiO₂ meso- porous nanomaterial is 11.40 times irradiated with the ultraviolet than that with visible light irradiation. But there is 1.42 times corresponding to the pure TiO₂. Within 50 min, ultraviolet degradation rate of MB over the S-Al-TiO₂ is 98.5%.

• Periodical: Advanced Materials Research (Volume 499)
• Pages: 58-62
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.499.58
• Online since: April 2012
• Authors: Yan Su, Shao You Liu, Wen Hua Tang
• Keywords: Mesoporous Material, Methylene Blue (MB), Photodecomposition, S, Al Doped TiO₂, Solid-State Reaction

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