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DOI: https://doi.org/10.4491/eer.2019.159
Simultaneous degradation of nitrogenous heterocyclic compounds by catalytic wet-peroxidation process using box-behnken design
Vijayalakshmi Gosu1, Shivali Arora2, and Verraboina Subbaramaiah2
1Department of Chemical Engineering, MBM Engineering College, Jodhpur 342011, India
2Department of Chemical Engineering, MNIT Jaipur, Jaipur 302017, India
Corresponding Author: Verraboina Subbaramaiah ,Tel: +91-8560073299, Email: vsr.chem@mnit.ac.in
Received: April 18, 2019;  Accepted: July 9, 2019.
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The present study investigates the feasibility of nitrogenous heterocyclic compounds (NHCs) (Pyridine-Quinoline) degradation by catalytic wet per-oxidation (CWPO) in the presence of nanoscale zerovalent iron supported on granular activated carbon (nFe0/GAC) using statistical optimization technique. Response surface methodology (RSM) in combination with Box-Behnken design (BBD) was used to optimize the process parameters of CWPO process such as initial pH, catalyst dose, hydrogen peroxide dose, initial concentration of pyridine (Py) and quinolone (Qn) were chosen as the main variables, and total organic carbon (TOC) removal and total Fe leaching were selected as the investigated response. The optimization of process parameters by desirability function showed the ~85% of TOC removal with process condition of initial solution pH 3.5, catalyst dose of 0.55 g/L, hydrogen peroxide concentration of 0.34 mmol, initial concentration of Py 200 mg/L and initial concentration of Qn 200 mg/L. Further, for TOC removal the analysis of variance results of the RSM revealed that all parameter i.e. initial pH, catalyst dose, hydrogen peroxide dose, initial concentration of Py and initial concentration of Qn were highly significant according to the p values (p < 0.05). The quadratic model was found to be the best fit for experimental data. The present study revealed that BBD was reliable and effective for the determination of the optimum conditions for CWPO of NHCs (Py-Qn).
Keywords: Catalytic wet peroxidation | CWPO | Nitrogenous heterocyclic compounds | Box-Benken Design | Response surface methodology
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