Inhibition Effect of δ-MnO2 on TiO2 Photocatalytic Degradation of Methyl Orange

Chem. J. Chinese Universities

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Inhibition Effect of δ-MnO₂ on TiO₂ Photocatalytic Degradation of Methyl Orange

LI Shun-Jun¹, MA Zi-Chuan^1,2*, DING Ke-Qiang¹, LIU Jing-Ze²*

1. College of Chemistry and Material Sciences,
2. College of Life Science, Hebei Normal University, Shijiazhuang 050016, China

Received:2007-08-08 Revised:1900-01-01 Online:2007-12-10 Published:2007-12-10
Contact: MA Zi-Chuan

Abstract

Abstract: The influences of δ-MnO₂ particles on the photocatalytic activity of P-25 TiO₂ were investigated with kinetical method through the photocatalytic degradation of methyl orange. The TiO₂ photocatalyst, before and after being contaminated by δ-MnO₂, was characterized with UV-visible diffuse reflectance spectroscopy(UV-Vis DRS) and photoluminescence(PL). The dynamics results show the distinct existence of poisoning effect of δ-MnO₂ on TiO₂ photocatalysis at different initial pH values. The higher the concentration of the δ-MnO₂, the more evident the poisoning effect. The characterizations indicate that the absorption band edge of TiO₂ is blue-shifted and the intensity is decreased, and the intensity of PL signals of TiO2 is suppressed due to the contact between δ-MnO₂ and TiO₂. Therefore, the presence of δ-MnO₂ increases the band gap and causes the decrease of UV absorption of TiO₂, and δ-MnO₂ can also act as a recombination centers of photoinduced electron-hole. The effects of δ-MnO2 particles in environment on the stability of TiO₂ photocatalyst were revealed.

Key words: TiO₂, δ-MnO₂, Deactivation, Photocatalysis, Methyl orange

CLC Number:

O643.32

TrendMD:

LI Shun-Jun¹, MA Zi-Chuan^1,2*, DING Ke-Qiang¹, LIU Jing-Ze²*. Inhibition Effect of δ-MnO₂ on TiO₂ Photocatalytic Degradation of Methyl Orange[J]. Chem. J. Chinese Universities, doi: .

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Inhibition Effect of δ-MnO₂ on TiO₂ Photocatalytic Degradation of Methyl Orange

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