Optimization of azo printing dye removal with oak leaves-nZVI/H2O2 system using statistically designed experiment. (20th November 2018)

• Record Type: Journal Article
• Authors: Kecić, Vesna; Kerkez, Đurđa; Prica, Miljana; Lužanin, Ognjan; Bečelić-Tomin, Milena; Pilipović, Dragana Tomašević; Dalmacija, Božo
• Is Part Of: Journal of cleaner production. Volume 202(2018)
• Page Start: 65
• Page End: 80
• Publication Date: 2018-11-20
• Subjects: Magenta -- nZVI -- Fenton process -- Definitive screening design -- Optimization -- Printing effluent; 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.2018.08.117
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: The paper investigates the potential use of nano zero-valent iron (nZVI) particles as a cheap, natural and effective catalyst in the Fenton-like system for the removal of water-based Magenta flexographic dye from aqueous solution. The functional nZVI was successfully synthesized within an environmentally friendly method, by using the natural product extract, oak leaves (OAK-nZVI). The process of Magenta removal was optimized using statistically designed experiment. The influence of four quantitative parameters on decolorization efficiency was investigated: initial dye concentration (20–180 mgL -1 ), OAK- nZVI dosage (0.75–60 mgL -1 ), H2 O2 concentration (1–11 mM) and pH value (2–10). The results of statistical analysis show that OAK-nZVI dosage and pH significantly contribute to the decolorization efficiency, while the concentration of H2 O2 has a significant influence on their impact. The optimization yielded highest removal efficiency of 91.95% under following conditions: initial dye concentration of 180 mgL −1, OAK-nZVI dosage of 60 mgL −1, H2 O2 concentration of 11 mM and pH value 2. Optimization results were experimentally verified. Treatment of real effluent under optimized experimental conditions resulted within 84.06% Magenta removal after a reaction time of 60 min. The absorption spectra of Magenta dye clearly indicate the changes in the molecular structure in the form of the destruction of azo bond in the chromophore, leading to the decolorization of dye solution. Based on the GC–MS analysis, the mechanism for Fenton-like oxidation of Magenta was proposed. Graphical abstract: Image Highlights: OAK-nZVI was used as a catalyst in Fenton-like process. The applied treatment provided a significant decolorization efficiency of azo dye. The process of Magenta removal was optimized using definitive screening design. Dye degradation was up to 84.06% in real printing effluent under optimal conditions. The findings provide insight into nanoremediation of printing wastewater.