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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received January 29, 2017
Accepted April 25, 2017

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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UV-LEDs assisted peroxymonosulfate/Fe2+ for oxidative removal of carmoisine: The effect of chloride ion

Mehdi Ahmadi^{1 2} Farshid Ghanbari^3† Alberto Alvarez⁴ Susana Silva Martinez⁴

¹Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ²Department of Environmental Health Engineering, School of Public Health, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ³Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran ⁴Centro de Investigación en Ingeniería y Ciencias Aplicadas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa, Cuernavaca, Mor. Mexico. C.P. 62209, Mexico

Ghanbari.env@gmail.com

Korean Journal of Chemical Engineering, August 2017, 34(8), 2154-2161(8), 10.1007/s11814-017-0122-1

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Abstract

The performance of UVA-LEDs assisted peroxymonosulfate (PMS)/Fe2+ system was evaluated on carmoisine (E122) decolorization. Complete color removal was obtained under the conditions of pH=3.0, PMS=1.5mM, Fe2+=1mM and 25 min reaction time. UVA-LEDs were preferable compared to conventional UVA lamp in terms of decolorization. The functions of Co2+, Cu2+, Mn2+ and Fe2+ were compared and their results showed that Co2+ and Fe2+ had the highest efficiencies. Moreover, the presence of chloride ion showed a double role in different concentrations in which promotional effect was observed in 100mM Cl-<, while inhibitory effect occurred in 1-10mM Cl-. However, the high concentration of chloride had no influence on mineralization of E122. The scavenging results demonstrated that the UV irradiation increased the contribution of HO°. In addition, in the presence of chloride ion, HOCl along with sulfate and hydroxyl radicals were the major oxidative agents.

Keywords

Food Dye UVA-LEDs Sulfate Radical Peroxymonosulfate Scavenging Effect

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