Decomposition of phenylarsonic acid by AOP processes: degradation rate constants and by-products |
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Authors: | K. Jaworek M. Czaplicka Ł. Bratek |
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Affiliation: | 1. Institute of Non-Ferrous Metals, 44-100, Gliwice, Sowinskiego 5, Poland
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Abstract: | 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. |
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