Enhanced sonolytic mineralization of basic red 29 in water by integrated ultrasound/Fe²⁺/TiO₂ treatment

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• 作者：Zineb Boutamine ; Oualid Hamdaoui ; Slimane Merouani
• 关键词：Advanced oxidation processes ; Ultrasound ; Basic red 29 (BR29) ; Ultrasound/Fe2+/TiO2 treatment ; Mineralization
• 刊名：Research on Chemical Intermediates
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：43
• 期：3
• 页码：1709-1722
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry;
• 出版者：Springer Netherlands
• ISSN：1568-5675
• 卷排序：43

文摘

Advanced oxidation processes (AOPs), based on hydroxyl radical (·OH) induced oxidation, have been widely investigated to develop novel and green technologies for wastewater treatment. In this work, the degradation and mineralization of Basic Red 29 (BR29), a cationic azo dye, by ultrasound (US) at 300 kHz and 80 W was investigated. Even if ultrasound eliminated BR29 (30 mg L−1) in 1 h, a low degree of mineralization (~10 %) was obtained due to the hydrophilic character of the byproducts formed during the sono-oxidative process. To overcome this weakness, an innovative technique integrating ultrasound/Fe2+/TiO₂ was used and was found to be more effective for the degradation and mineralization of the dye. The amount of each catalyst was optimized for the three systems US/TiO₂, US/Fe2+ and US/Fe2+/TiO₂. The degradation rate of BR29 with US/Fe2+ and US/Fe2+/TiO₂ treatments was, respectively, 2 and 2.34 times higher than that obtained with US alone. Correspondingly, the mineralization degree increased from 5 % with ultrasound alone to 10 % with US/TiO₂, 35 % with US/Fe2+ and 64 % with US/Fe2+/TiO₂ after 30 min of treatment and from 10 % with US to 13, 51, and 81 % with, respectively, US/TiO₂, US/Fe2+, and US/Fe2+/TiO₂ processes after 1 h of treatment. These results showed a synergy of 1.41 at 30 min and 1.29 at 1 h between US/Fe2+ and US/TiO₂ processes toward the mineralization of BR29. The mechanism of the beneficial effect of the US/Fe2+/TiO₂ integrating treatment was clarified and discussed.