TiO₂-assisted degradation of acid orange 7 textile dye under solar light

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• 作者：Susana Flores Villanueva ; Susana Silva Martí ; nez
• 关键词：Photocatalysis ; Acid orange 7 ; Solar light ; Persulphate ion
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2007
• 期刊代码：81_09270248
• 类别：ce
• 出版时间：22 September 2007
• 卷：91
• 期：15-16
• 页码：1492-1495
• 文件大小：132 K

摘要

Photocatalytic degradation of acid orange 7 (AO7) in aqueous systems was successfully achieved by the combination of TiO₂ with potassium persulphate under solar light using a photochemical reactor with recirculation. Degradation of AO7 involves color removal and mineralization. The employment of TiO₂ removed mg src="http://www.sciencedirect.com/scidirimg/entities/223c.gif" alt="not, vert, similar" border=0>85%of color from the 0.2 mM AO7 aqueous solution under solar light; while, mg src="http://www.sciencedirect.com/scidirimg/entities/223c.gif" alt="not, vert, similar" border=0>66%of color was abated using the persulphate ion as oxidant in the absence of TiO₂ under similar conditions in 2 h. However, over 90%of color removal was achieved by combining TiO₂ and the persulphate ion for the same solution under similar conditions. Color removal was faster at pH 3. Mineralization of AO7 was followed by measuring chemical oxygen demand (COD). Negligible COD abatement of the textile dye was observed in the absence of persulphate ions (S₂O₈²⁻) while over 70%of COD abatement was observed for the initial dye concentrations of 0.2–0.7 mM employing a mix of TiO₂–S₂O₈²⁻ under solar light.