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Submitted: 01 May 2019
Revised: 28 May 2019
Accepted: 15 Dec 2019
First published online: 30 Jun 2019
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Avicenna J Environ Health Eng. 2019;6(1):51-59.
doi: 10.15171/ajehe.2019.07
  Abstract View: 57
  PDF Download: 74

Research Article

Removal of Cephalexin From Aqueous Solutions Using Magnesium Oxide/Granular Activated Carbon Hybrid Photocatalytic Process

Abdolmotaleb Seid-Mohammadi 1 ORCID logo, Mina Bahrami 2, Sana Omari 2, Fateme Asadi 3 * ORCID logo

1 Social Determinants of Health Research Center, Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran
2 Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran
3 Student Research Committee, Department of Environmental Health Engineering, Hamadan University of Medical Sciences, Hamadan, Iran

Abstract

In the present study, magnesium oxide/granular activated carbon (MgO/GAC) composite as a catalyst was synthesized using the sol-gel method and its catalytic potential was investigated in the presence of ultraviolet (UV) irradiation for the removal of cephalexin (CLX) in a batch mode reactor. Then, the characterization of the MgO/GAC composite was determined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Next, the effect of operational parameters was evaluated, including the pH of the solution (3-11), the dosage of composite (1-6 g/L), initial CLX concentration (20-100 mg/L), and contact time (10-60 minutes). The maximum CLX degradation with an initial concentration of 20 mg/L was as high as 98% at pH=3, 4 g/L of MgO/GAC composite with UV irradiation within 60-minute contact time. In addition, the removal process of CLX could be described by the pseudofirst-order kinetic. Further, the chemical oxygen demand (COD) and total organic carbon (TOC) removal rate were 78% and, 62.3% in optimum conditions, respectively. The results indicated that the UV/MgO/GAC hybrid photocatalytic process can be considered as an efficient alternative for treating the wastewater containing CLX
Keywords: Degradation, Ultraviolet, Cephalexin, Magnesium oxide, Granular activated carbon,
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