期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 782, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.146781
关键词
2,4-DCP; UV/IO4-; Degradation kinetics; Iodine radicals
资金
- China Scholarship Council (CSC) [201606200054]
- Research Council of KU Leuven [PDM/19/104]
This study investigated the efficiency and kinetics of the photoactivated periodate process for degrading 2,4-dichlorophenol in water, finding that UV/IO4- had a higher degradation rate than UV alone, regardless of pH. By adjusting the concentration of periodate and 2,4-DCP, the degradation rate and removal efficiency could be controlled effectively.
This study explores the efficiency and kinetics of the photoactivated periodate process for the degradation of 2,4-dichlorophenol (2,4-DCP) in water. The obtained results show that the degradation rate was considerably higher for UV/IO4- compared to UV irradiation alone. Pseudo first-order reaction rate kinetics were obtained for all process conditions. The pH did not have a significant impact on the decomposition of 2,4-DCP using photoactivated periodate. Therefore, the applied method can be used to treat (waste)water at various pH. By raising the initial concentration of periodate to 5 mM, the degradation rate increased, while it decreased again at a concentration of 8 mM. As the 2,4-DCP concentration increased, the removal rate decreased. The extent of degradation was observed to be proportional with the UV intensity. A mechanistic study revealed that iodine radicals dominated the degradation of 2,4-DCP by photoactivated periodate. whereas center dot OH and O(P-3) only played a minor role. At pH 5.0. all chlorine atoms in 2,4-DCP were released as chloride ions in the UV/IO4- process, hence reaching a total dechlorination. Finally, the presence of inorganic salts, even at high levels, did not significantly impact the degradation. According to the results achieved in this study, the UV/IOC system can be considered as a valuable alternative to treat effluents containing chlorinated organic compounds such as pulp and paper mill effluents and brine (waste)water. (C) 2021 Elsevier B.V. All rights reserved.
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