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Heterogeneous Persulfate Activation by Nano-Sized Mn3o4 to Degrade Furfural From Wastewater Publisher



Shabanloo A1 ; Salari M1 ; Shabanloo N1 ; Dehghani MH2, 3 ; Mohan D5
Authors
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Authors Affiliations
  1. 1. Student Research Committee, Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran
  2. 2. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Science, Tehran, Iran
  3. 3. Institute for Environmental Research, Center for Solid Waste Research, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, United States
  5. 5. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India

Source: Journal of Molecular Liquids Published:2020


Abstract

The simultaneous use of persulfate (PS) and nano-Mn3O4 was investigated as an advanced oxidation process for furfural degradation and oil refinery wastewater treatment. The synthesized Mn3O4 nanoparticles were characterized by XRD, BET, BJH and FESEM-EDS and then successfully used as a heterogeneous catalyst for PS activation. The effects of five independent variables on the performance of nano-Mn3O4/PS system were investigated and optimized using a 5-level-5-factor full Central Composite Design (CCD). Accordingly, CCD developed a reduced quadratic polynomial model with P-value < 0.0001 and R2 = 0.9996. The optimal values for the nano-Mn3O4 dosage, PS concentration, solution pH, stirring rate and furfural concentration were 1.2 g/L, 6.34 mM, 4.82, 337 rpm and 50 mg/L, respectively. The maximum experimental removal efficiencies under these conditions for PS alone, nano-Mn3O4 alone and the combined nano-Mn3O4/PS system were 8.36, 4 and 91.14%. Considering the kinetic coefficients of furfural removal in the individual and combined systems, a significant synergistic effect was observed in the nano-Mn3O4/PS process. Acetic acid, formic acid, maleic acid, and oxalic acid were the major intermediates of furfural degradation by LC-MS analysis. Alcohol-based probe experiments demonstrated that the sulfate radical was the dominant active radical at optimum pH. The optimized nano-Mn3O4/PS process can effectively increase the biodegradability index (BOD/COD ratio) of oil refinery wastewater. © 2018 Elsevier B.V.
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