An innovative ultrasound, Fe²⁺ and TiO₂ photoassisted process for bisphenol a mineralization

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• 作者：Ricardo A. Torres-Palma ; Jessica I. Nieto ; Evelyne Combet ; Christian Pé ; trier ; Cesar Pulgarin
• 关键词：Sonochemical degradation ; Photocatalysis ; Photo-Fenton ; Sonophotocatalysis ; Endocrine-disrupting chemical ; Bisphenol A elimination ; Water treatment ; Advanced oxidation
• 刊名：Water Research
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：44
• 期：7
• 页码：2245-2252
• 全文大小：409 K

文摘

This paper explores the degradation of a model pollutant, bisphenol A, by an advanced oxidation process that combines sonolysis, Fe²⁺, and TiO₂ in a photoassisted process. Experiments were done under saturated oxygen conditions. The effect of different Fe²⁺ (0.56 and 5.6 mg/L) and TiO₂ (10 and 50 mg/L) concentrations was investigated on both the elimination and mineralization of the pollutant. A pronounced synergistic effect that led to the complete and rapid elimination of dissolved organic carbon (DOC) was observed even at low catalyst loadings. In this system, almost a complete removal of DOC (93 % ) was observed after 4 h using 10 and 5.6 mg/L of TiO₂ and Fe²⁺, respectively, whereas at the same time, only 5, 6, and 22 % of DOC was removed by an individual process alone (TiO₂ photocatalysis, ultrasound, and photo-Fenton, respectively). In this system, ultrasound has the principal role of eliminating the initial substrate and providing hydrogen peroxide for the photocatalytic systems, while photo-Fenton and TiO₂ photocatalysis are mainly responsible for the transformation of the intermediates in CO₂ and H₂O. The role of H₂O₂ generated from the sonochemical process is also discussed.