Non-catalytic remediation of aqueous solutions by microwave-assisted photolysis in the presence of H2O2 |
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| Affiliation: | 1. Research Division for Industry & Environment, Korea Atomic Energy Research Institute, Jeongeup-si, Jeollabuk-do 580-185, Republic of Korea;2. Department of Environmental Engineering, Konkuk University, Seoul 143-701, Republic of Korea;1. College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing, Jiangsu Province, 210009, PR China;2. State Key Laboratory of Coordination Chemistry, Nanjing National Laboratory of Microstructures, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China;1. Univ. Lille, INSERM, U1192 - Laboratoire Protéomique, Réponse Inflammatoire et Spectrométrie de Masse-PRISM, F-59000 Lille, France;2. Univ. Lille, CNRS, UMR 8523 - PhLAM - Physique des Lasers Atomes et Molécules, F-59000 Lille, France;3. Sorbonne Universités, UPMC Univ Paris 06, Ecole Normale Supérieure, CNRS, Laboratoire des Biomolecules (LBM), 4 place Jussieu, 75005 Paris, France;1. College of Chemistry and Chemical Industry, Fuyang Normal College, Fuyang 236041, China;2. Anhui Provincial Key Laboratory for Degradation and Monitoring of Pollution of the Environment, Fuyang 236041, China;3. School of Physics and Electronic Science, Fuyang Normal College, Fuyang 236041, China |
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| Abstract: | Advanced oxidation processes have emerged as potentially powerful methods to transform organic pollutants in aqueous solutions into non-toxic substances. In this work, a comparison of degradation dynamics of five aromatic compounds (phenol, chlorobenzene, nitrobenzene, 4-chlorophenol, and pentachlorophenol) in aqueous solutions by non-catalytic UV, MW, and combined MW/UV remediation techniques in the presence of H2O2 is presented. Relative degradation rate constants have been monitored and the major products were identified. The combined degradation effect of UV and MW radiation was found larger than the sum of isolated effects in all cases studied. It is concluded that such an overall efficiency increase is essentially based on a thermal enhancement of subsequent oxidation reactions of the primary photoreaction intermediates. Optimizations revealed that this effect was particularly significant in samples with a low concentration of H2O2, however, a larger excess of H2O2 was essential to complete the destruction in most experiments. The absence of heterogeneous catalysts was in no doubt an additional advantage of the technique applied. |
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