Electrosorption-promoted Photodegradation of Opaque Wastewater on A Novel TiO2/Carbon Aerogel Electrode

详细信息    查看全文

• 作者：Meifen Wu ; Yuning Jin ; Guohua Zhao ; Mingfang Li ; Dongming Li
• 刊名：Environmental Science & Technology
• 出版年：2010
• 出版时间：March 1, 2010
• 年：2010
• 卷：44
• 期：5
• 页码：1780-1785
• 全文大小：283K
• 年卷期：v.44,no.5(March 1, 2010)
• ISSN：1520-5851

文摘

A novel electrosorption-photocatalysis synergistic electrode of TiO₂/carbon aerogel (TiO₂/CA) is prepared. The thermal stability and dispersion of the anatase TiO₂ particles are well facilitated by the porous and discontinuous microstructure of CA. The degradation experiments show that the TiO₂/CA material is not only a good photocatalyst but also an excellent electrosorptive electrode. The TiO₂/CA is easily molded to an agglomerate electrode. The opaque wastewater with dyestuff is degraded effectively by the electrosorption-promoted photocatalytic process on this electrode. For the simulated methylene blue (MB) wastewater (150 mg L⁻¹), the rate constant of MB degradation in the electro-assisted photocatalytic process with the conventional ITO-supported TiO₂ (TiO₂/ITO) is 0.55 × 10⁻³ min⁻¹ and that the electrosorption-promoted photocatalysis with TiO₂/CA is 10.27 × 10⁻³ min⁻¹, which is 18 times the former. In the electrosorption-promoted photocatalytic process with TiO₂/CA, the energy consumption removing per unit TOC is only 15% of that in the electro-assisted photocatalysis with TiO₂/ITO, because the electrosorption is a nonfaradic process irrelative to any electron transfer and requires very low consumption. This study provides a new method for exploring highly efficient electrosorption-promoted photocatalytics technology in the treatment of opaque wastewater.