Electric-Field-Enhanced Photocatalytic Removal of Cr(VI) under Sunlight of TiO2 Nanograss Mesh with Nondestructive Regeneration and Feasible Collection for Cr(III)

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• 作者：S. C. Xu ; H. L. Ding ; S. S. Pan ; Y. Y. Luo ; G. H. Li
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6887-6893
• 全文大小：450K
• ISSN：2168-0485

文摘

Rutile TiO₂ nanograss was synthesized by a hydrothermal method on Ti mesh. The nanograss is composed of thin TiO₂ nanorods with abundantly exposed {110} facets. The TiO₂ nanograss on Ti mesh (TNTM) shows an excellent photocatalytic removal of Cr(VI) ions from plating wastewater under sunlight, and the removal capacity can reach as high as 143.8 mg/g. It was found that an external electric field can greatly enhance the removal efficiency of the TNTM, in which the electrons provided by the electric field can effectively neutralize the photoholes and inhibit the recombination of photoelectrons and photoholes. The TNTM can be easily removed after photocatalytic reaction and can be nondestructively regenerated by an electrolyzing process. The Cr(III) ions on the TNTM can be collected by the electrolyzation, effectively avoiding secondary pollution.