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In relation to this article, we declare that there is no conflict of interest.
Publication history
Received June 17, 2018
Accepted October 10, 2018
articles This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Degradation and removal of p-nitroaniline from aqueous solutions using a novel semi-fluid Fe/charcoal micro-electrolysis reactor

1Environmental Health Engineering Research Center, Kerman University of Medical Sciences, Kerman, Iran 2Department of Environmental Health, School of Public Health, Kerman University of Medical Sciences, Kerman, Iran 3Department of Food and Drug Control, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran 4Department of Medicinal Chemistry, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran
H.Mahdizadeh2018@gmail.com
Korean Journal of Chemical Engineering, February 2019, 36(2), 217-225(9), 10.1007/s11814-018-0166-x
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Abstract

p-Nitroaniline (PNA) is a common contaminant in the wastewater of oil refineries, the petrochemical industry and from production of pesticides, dyes and glue. The aim of this research was to determine the extent of degradation and removal of PNA from aqueous solutions by a novel semi-fluid Fe/charcoal reactor, process optimization, determination of the intermediate and final products and the degradation reaction path. The effective factors in the degradation process were contact time, aeration amount, initial PNA concentration, Fe/charcoal ratio, and initial pH of the solution. The intermediate products were determined by GC-MS. The kinetics of the degradation reaction also was determined. PNA removal efficiency in an actual sample from petrochemical industry wastewater was tested under optimal conditions. The maximum removal efficiency under the optimal conditions (pH: 7; contact time 120min; aeration rate 10 L/min; Fe/charcoal ratio: 2/1; initial concentration of PNA: 10 mg/L) for the synthetic solution and in actual wastewater samples were 95% and 89%, respectively. In addition, the system stability was investigated in ten consecutive cycles of the electrode reuse. The removal efficiency decreased as low as 5%, which indicates the high stability of the system. The degradation process was determined to follow pseudo-first kinetics and the Langmuir-Hinshelwood model. Fe/charcoal micro-electrolysis is a relatively highly efficient system for removing PNA from wastewater and is suggested for this purpose.

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