Photocatalytic degradation of cephalexin by UV activated persulfate and Fenton in synthetic wastewater: optimization, ki
- PDF / 1,702,595 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 84 Downloads / 181 Views
RESEARCH ARTICLE
Photocatalytic degradation of cephalexin by UV activated persulfate and Fenton in synthetic wastewater: optimization, kinetic study, reaction pathway and intermediate products Ali Almasi 1,2 & Rohallah Esmaeilpoor 1,2 & Hoshyar Hoseini 2 & Vahideh Abtin 1,2 & Mitra Mohammadi 2,3 Received: 30 December 2019 / Accepted: 29 September 2020 # Springer Nature Switzerland AG 2020
Abstract We used Low pressure mercury vapor lamp activated of Sodium Persulfate (UV/SPS) and Fenton processes in two separate reactors to comparison of cephalexin (CPX) degradation in aqueous solution. The effect of pH, initial concentration of SPS, concentration of CPX, concentration of H2O2 and concentration of Fe2+ on the degradation of CPX were investigated. The residue of CPX and metabolites were determined by HPLC and GC/MS. The Total Organic Carbon (TOC) analysis was utilized for surveying the mineralization of CPX. Biodegradability of CPX in both advanced oxidation processes was evaluated by BOD5/COD in optimum condition. The results indicated that the maximum CPX removal was obtained at pH 3, H2O2 3 mM, concentration of initial CPX 10 mg/L and by increasing the doses of SPS from 0.1 to 0.2 mM, the degradation of CPX was enhanced. In this study, the most important factors for AOP efficiency was concentration of initial CPX; and then pH in UV/SPS and H2O2 in Fenton processes. The TOC measurements indicate that the UV/SPS and Fenton can efficiently mineralize CPX. CPX removed enough to achieve suitable biodegradability for a further biological process. Too, analysis of generated intermediates during the degradation of CPX was conducted by GC/MS method and a degradation pathway was proposed. Keywords Cephalexin . Advanced oxidation process . Metabolite . HPLC . GC/MS
Introduction Antibiotics are compounds that are widely used in medicine, veterinary medicine and agriculture. Medicines and pharmaceutical compounds are continuously grown and consumed in a large volume; and are added annually to the number of consumers and the variety of antibiotics [1]. Since a small amount of antibiotics are absorbed into the body, a significant portion of them are excreted through the urine and feces, and enter the aquatic environment. The concentration of antibiotic in hospitals and urban wastewaters is in the range of 0.3 to 100 mg/L and higher [2]. Unfortunately, * Mitra Mohammadi [email protected] 1
Social Development and Health Promotion Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
2
Department of Environmental Health Engineering, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
3
Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
conventional wastewater treatment plants do not show suitable efficiency removal of these compounds. Concentrations ranging from ng/L to mg/L of antibiotics in surface and underground waters and other aquatic resources have been found [3, 4]. The presence of antibiotics is known as an environmental a
Data Loading...
