Decomposition of phenylarsonic acid by AOP processes: degradation rate constants and by-products.
The paper presents results of the studies photodegradation, photooxidation, and oxidation of phenylarsonic acid (PAA) in aquatic solution. The water solutions, which consist of 2.7 g dm(-3) phenylarsonic acid, were subjected to advance oxidation process (AOP) in UV, UV/H2O2, UV/O3, H2O2, and O3 systems under two pH conditions. Kinetic rate constants and half-life of phenylarsonic acid decomposition reaction are presented. The results from the study indicate that at pH 2 and 7, PAA degradation processes takes place in accordance with the pseudo first order kinetic reaction. The highest rate constants (10.45 × 10(-3) and 20.12 × 10(-3)) and degradation efficiencies at pH 2 and 7 were obtained at UV/O3 processes. In solution, after processes, benzene, phenol, acetophenone, o-hydroxybiphenyl, p-hydroxybiphenyl, benzoic acid, benzaldehyde, and biphenyl were identified.
Institute of Non-Ferrous Metals, 44-100, Gliwice, Sowinskiego 5, Poland, katarzyna.bortniczuk@imn.gliwice.pl.
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Czaplicka
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D001152:Arsenicals / Q000737:chemistry*; D006207:Half-Life; D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D007700:Kinetics; D013058:Mass Spectrometry; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry; D010782:Photolysis; D013997:Time Factors; D018508:Water Purification / Q000379:methods*
D001152:Arsenicals; C020979:benzenearsonic acid; D010126:Ozone