Degradation of the pharmaceutical Metronidazole via UV, Fenton and photo-Fenton processes
CHEMOSPHERE, vol.63, no.2, pp.269-276, 2006 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 63 Issue: 2
- Publication Date: 2006
- Doi Number: 10.1016/j.chemosphere.2005.07.029
- Journal Name: CHEMOSPHERE
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Page Numbers: pp.269-276
- Keywords: advanced oxidation, pharmaceuticals, Fenton, photolysis, ultraviolet, ADVANCED OXIDATION PROCESSES, AQUATIC ENVIRONMENT, THERAPEUTIC DRUGS, WATER, FATE, RESIDUES, HORMONES, REMOVAL, SEWAGE
- Akdeniz University Affiliated: No
Abstract
Degradation rates and removal efficiencies of Metronidazole using UV, UV/H2O2, H2O2/Fe2+, and LTV/H2O2/Fe2+ were studied in de-ionized water. The four different oxidation processes were compared for the removal kinetics of the antimicrobial pharmaceutical Metronidazole. It was found that the degradation of Metronidazole by UV and UV/ H2O2 exhibited pseudo-first order reaction kinetics. By applying H2O2/Fe2+, and UV/H2O2/Fe2+ the degradation kinetics followed a second order behavior. The quantum yields for direct photolysis, measured at 254 mn and 200400 nm, were 0.0033 and 0.0080 mol E-1, respectively. Increasing the concentrations of hydrogen peroxide promoted the oxidation rate by UV/ H2O2. Adding more ferrous ions enhanced the oxidation rate for the H2O2/Fe2+ and UV/H2O2/Fe2+ processes. The major advantages and disadvantages of each process and the complexity of comparing the various advanced oxidation processes on an equal basis are discussed. (c) 2005 Published by Elsevier Ltd.