Green synthesis of red mud based ZnOFe2O3 composite used for photo-Fenton reaction under visible light. (10th January 2019)

• Record Type: Journal Article
• Authors: Li, Yunshang; Wei, Guangtao; Shao, Luhua; Li, Zhongmin; Yu, Fengjian; Liu, Jialiang; Yang, Xianli; Lu, Qiaoling; Li, Anpei; Huang, Yu; Zhang, Linye
• Is Part Of: Journal of cleaner production. Volume 207(2019)
• Page Start: 717
• Page End: 727
• Publication Date: 2019-01-10
• Subjects: Red mud -- ZnO -- α-Fe2O3 -- Green synthesis -- Photo-Fenton -- Visible light; 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.2018.10.051
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: In this work, using solid waste red mud (RM) as main raw material and without addition of chemical reagents of alkali and ferric salt, a new method of flocculation-calcination was introduced as a green and facile process to produce RM based ZnOFe2 O3 composite (RM-C) which can be used as a catalyst for photo-Fenton reaction under visible light. The prepared catalyst was characterized by SEM, EDS, XRD, BET, UV–Vis DRS and XPS. The characterization results showed the iron phase in RM-C was mainly α-Fe2 O3, and ZnO formed in RM-C was amorphous and highly dispersed. RM-C showed a good response to the visible light, and the order of absorbance in 373–542 nm was RM-C > RM > ZnO. RM-C had an excellent long-term stability in the photo-Fenton process. The possible mechanisms in photo-Fenton system catalyzed by RM-C under visible light were presented. Using RM-C as catalyst, the toxicity of Orange II was greatly weakened by the photon-Fenton system under visible light. The method of flocculation-calcination was a green and feasible process for the preparation of RM-C, and the prepared RM-C was an effective composite catalyst for the photon-Fenton reaction under visible light. Graphical abstract: Image Highlights: Synthesis of red mud based composite by flocculation-calcination is proposed. The flocculation-calcination is a green and feasible process. Red mud based ZnOFe2 O3 composite is successfully prepared by this method. The composite is a good catalyst for photon-Fenton reaction under visible light. The toxicity of Orange II is greatly weakened by using the composite.