Preparation and application of green calcium-based catalyst for advanced treatment of salty wastewater with ozone. (15th August 2022)

• Record Type: Journal Article
• Authors: Tu, Yuming; Chen, Jianjie; Shao, Gaoyan; Qu, Yixin; Zhang, Fan; Tian, Shichao; Zhou, Zhiyong; Ren, Zhongqi
• Is Part Of: Journal of cleaner production. Volume 362(2022)
• Publication Date: 2022-08-15
• Subjects: Ca-based catalyst -- Ozone oxidation -- Petrochemical salty wastewater -- Surface modification method -- COD removal Efficiency; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2022.132464
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: This paper reports an ozone oxidation catalyst for the advanced treatment of salty wastewater. The green Al2 O3 -polydopamine (PDA)-Cax Oy catalyst was synthesized using Ca 2+ as the main active site, Al2 O3 as carrier, and PDA as a coating agent. The efficiency of Al2 O3 -PDA-Cax Oy to treat petrochemical wastewater was investigated by studying the effects of preparation and reaction conditions, such as Ca 2+ concentration, calcination temperature and time, catalyst dosage, and pH on the chemical oxygen demand (COD) removal. Al2 O3 -PDA-Cax Oy displayed good degradation effects, with a COD removal of 62%, which is higher than that of commercial catalysts. Structure and morphology characterization analyses of Al2 O3 -PDA-Cax Oy revealed that Ca 2+ was uniformly dispersed through the traction and anchoring effect of PDA. Compared with traditional acidification treatment, the surface modification method used herein was not detrimental to the morphology of the carrier. A reaction mechanism based on the Al2 O3 -PDA-Cax Oy catalyst was proposed using electronic spin resonance spectroscopy. Graphical abstract: Image 1 Highlights: A novel green Ca-based catalyst was designed and synthesized for ozone oxidation. The prepared catalyst was used for treatment of real petrochemical wastewater. The COD removal of 62% was much higher than that of commercial catalysts. Ca 2 + was uniformly dispersed through the traction and anchoring effect of PDA. A reaction mechanism based on the Al2 O3 -PDA-Cax Oy catalyst was proposed.