A study of UV photolysis of antibiotics in aqueous solution by Cu(II)/S₂O₈²⁻

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A study of UV photolysis of antibiotics in aqueous solution by Cu(II)/S₂O₈²⁻

 

Author: Liu, Xiaochen
Title: A study of UV photolysis of antibiotics in aqueous solution by Cu(II)/S₂O₈²⁻
Degree: M.Sc.
Year: 2011
Subject: Antibiotics.
Solution (Chemistry)
Photochemistry.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: ix, 56 leaves : ill. (some col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2462917
URI: http://theses.lib.polyu.edu.hk/handle/200/6369
Abstract: Norfloxacin (NOR), is a synthetic antibiotic widely used to treat urinary tract infections. It is widespread in the aquatic environment, existing in municipal and industrial wastewater, surface waters and ground water. At present, less people have a well understanding on environmental impacts of this kind of chemical compounds. Traditional methods cannot remove NOR effectively. In this study, UV/S₂O₈²⁻/Cu (II) has been applied to degrade and minimize NOR in aqueous solution. Effect of various parameters including pH, S₂O₈²⁻ dosage, Cu(II) dosage, NOR concentration, UV wavelength and number of UV lamps on degradation performance were examined. Low acidic pH condition has a contribution on the photo-catalysis while block the reaction in direct photolysis process. Direct photolysis was slow, however, the initial decay rate and oxidation capacity were both enhanced by adding potassium peroxydisulfate (K₂S₂O₈). It was found that UV254 nm demonstrated the best degradation in photo-catalysis processes and the initial reaction rate and overall removal were both increased by increasing the number of 254nm UV lamps. According to the analysis, the UV /Cu (II)/S₂O₈²⁻ process shows promising performance in NOR degradation. In this study, to degrade 0.1mM NOR the optimal experimental conditions were observed to be: 1.0mM S₂O₈²⁻, 0.5mM Cu (II), under 254nm UV light at pH 3.3.

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