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Citation: ZHANG Hui, ZHANG Zhi-Feng, LI Hong-Fei, MENG Shu-Lan, LI De-Qian. Effect of Electrostatic Field on TiO₂ Photocatalysis[J]. Chinese Journal of Applied Chemistry, ;2008, 25(6): 629-632. shu

Effect of Electrostatic Field on TiO₂ Photocatalysis

1.
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022

Corresponding author: LI De-Qian,
Received Date: 7 June 2007
Available Online: 17 August 2007
Fund Project: 国家自然科学基金资助项目(20371046) (20371046)

The effect of electrostatic field on the photodegradation of Methyl Orange (MO) with P25 TiO₂ catalyst was investigated.The results showed that the effect of the electrostatic field is very different from the traditional electrically assisted photocatalysis (EAP).With the increase of the electrostatic field,the apparent photodegradation activity declined.The fastest degradation was obtained atc (TiO₂)=0.5 g/L without electrostatic field.However,the degradation rate of the same system was lower under higher electrostatic fields.The apparent rate constant of the degradation reaction under 20 kV electrostatic field was only 56% of that in the same system without electrostatic field.Furthermore,under the 20 kV field,the photodegradation was independent of the dosage of TiO₂.By comparing the particle size distribution and the sedimentation rate within and without electrostatic field,it was conduded that the effects of electrostatic field,such as the electrophoresis,the polarization and the destruction of surface charge layer,made the particles aggregate and deposit.The coagulation decreased the amount of the catalyst dispersed in the solutions,and finally,decreased the apparent rate constant of the degradation reaction.At the end,it was proposed that the coagulation effect could be used to recycle the TiO₂ nanoparticles from the photodegraded wastewater.
- electrostatic field,
- titania,
- photocatalysis,
- coagulation
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Effect of Electrostatic Field on TiO2 Photocatalysis

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Effect of Electrostatic Field on TiO₂ Photocatalysis