Catalytic activation of persulphate with Mn3O4 nanoparticles for degradation of acid blue 113: process optimisation and degradation pathway

• Published in: International journal of environmental analytical chemistry Vol. 102; no. 16; pp. 3786 - 3805
• Main Authors: Shokoohi, Reza, Salari, Mehdi, Shabanloo, Amir, Shabanloo, Nader, Marofi, Somayeh, Faraji, Hossein, Vanaei Tabar, Mohammad, Moradnia, Maryam
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 16.12.2022; Taylor & Francis LLC
• Subjects: Acetic acid; Acids; Azo dyes; Constants; Degradation; Dosage; Dyes; genetic algorithm; Genetic algorithms; Independent variables; Intermediates; Manganese oxides; Nanoparticles; Optimization; Oxalic acid; Oxidation; Oxidation process; Persulphate activation; pH effects; process optimisation; Rate constants; Removal; response surface methodology; Statistical analysis; Statistical methods; Synergistic effect; Variance analysis
• ISSN: 0306-7319; 1029-0397
• DOI: 10.1080/03067319.2020.1773810

The performance of the persulphate/Mn 3 O 4 nanoparticles (PS/Mn 3 O 4 ) oxidation process was investigated for the degradation of acid blue 113 (AB113) azo dye. XRD, N 2 adsorption-desorption analysis, FE-SEM and EDX confirmed the successful synthesis of Mn 3 O 4 nanoparticles. The effect of three independent variables including PS concentration, Mn 3 O 4 dosage and solution pH on the system response was optimised by genetic algorithm (GA) and central composite design (CCD) techniques. The results of ANOVA and fit statistics (P-value < 0.0001, = 0.9772) showed that the proposed quadratic model can predict the AB113 removal efficiency with high confidence. The optimum points for PS concentration, Mn 3 O 4 dosage and solution pH were predicted to be 61.46 mg/L, 57.69 and 3.00, respectively, by CCD method. Under these conditions, after 60 min of reaction, the maximum experimental removal efficiency of AB113 in the PS/Mn 3 O 4 oxidation system and separate application of PS and Mn 3 O 4 were obtained 96.70%, 18.0% and 7.0%, respectively. The pseudo-first-order rate constants of AB113 degradation the PS/Mn 3 O 4 oxidation system and separate application of PS and Mn 3 O 4 were 0.0597, 0.0029 and 0.0015 min −1 , respectively. In this way, the synergistic effect for degradation of AB113 in the PS/Mn 3 O 4 was determined 92.6%. Oxalic acid, naphthalen-1-ol and acetic acid were the major identified intermediates due to AB113 degradation.