Cu(II)–Fe(II)–H2O2 oxidative removal of 3-nitroaniline in water under microwave irradiation

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 260; pp. 386 - 392
• Main Authors: Wang, Nannan, Zheng, Tong, Jiang, Jiping, Wang, Peng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.01.2015
• Subjects: 3-Nitroaniline; Combined-catalyst; Fenton-like process; Kinetics; Microwave assistance; 3-Nitroaniline; Combined-catalyst; Fenton-like process; Kinetics; Microwave assistance
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2014.09.002

•Coexistence of Cu(II) and Fe(II) in MW-Fenton-like process was studied in detail.•3-Nitroaniline was removed effectively by MW-Cu(II)-Fenton process.•Experimental parameters were optimized by kinetics study.•Relationship between reaction rate constant and reactant concentration was determined.•Probable Cu(II) effect in MW-Cu(II)-Fenton process was examined preliminarily. Cu(II)–Fe(II)–H2O2 process was studied through degrading 3-nitroaniline (3-NA) in water under microwave (MW) irradiation. The experimental conditions were studied by investigating the removal rates and reaction rate constants of 3-NA at different levels of influence factors. The removal rates and reaction rate constants both increased with the increase of Cu(II), Fe(II) and H2O2 dosages when they were at reasonable concentration ranges ([Cu(II)] 0.0016–0.0094mmolL−1, [Fe(II)] 0.051–0.205mmolL−1 and [H2O2] 4.34–17.34mmolL−1). Under the examined conditions (initial pH=5.3, [Cu(II)], [Fe(II)] and [H2O2] were 0.0078, 0.205 and 17.37mmolL−1, respectively, PMW=100W, V3-NA=400mL), more than 92% of 3-NA was removed at 8.5min and the reaction rate constant reached 0.310min−1. Furthermore, the mathematical relationship between reaction rate constants and reactants concentrations was obtained via kinetic study, the result was k=43.9·e-2905.2T·[H2O2]1.675·[Fe(II)]0.908·[Cu(II)]0.080. Finally, the probable effect of Cu(II) in Cu(II)-Fenton process under MW irradiation was speculated according to the comparison result of 2-hydroxyterephtalic acid (generated by the reaction between hydroxyl radicals and terephthalic acid) intensity, the study of synergetic effects of Cu(II) and Fe(II) in Cu(II)-Fenton process and the comparative analysis of reaction mechanisms in Fenton process and Cu(II)–H2O2 process.