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Irradiation of ultrasound to 5-methylbenzotriazole in aqueous phase: Degradation kinetics and mechanisms
Institution:1. Department of Chemistry, Auburn University at Montgomery, Montgomery, AL 36117, United States;2. Department of Chemistry and Biochemistry, Florida International University, University Park, Miami, FL 33199, United States;1. School of Civil, Environmental and Architectural Engineering, Korea University, Seoul 136-701, Republic of Korea;2. Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur 50603, Malaysia;3. Nanotechnology and Catalysis Research Centre (NANOCAT), University of Malaya, Kuala Lumpur 50603, Malaysia;4. National Institute of Enviromental Research ministry of Environment Nakdong River Environment Research Center, 239-3, Pyeongri, Dasanmyeon, Gonyeongu Gyeongsangbudo 717-873, Republic of Korea;5. Department of Civil Environmental and Environmental Engineering, Kumoh National Institute of Technology, Daehak-ro 61, Gumi, Gyeongbuk 730-701, Republic of Korea;1. Department of Plant Pathology, Patuakhali Science and Technology University, Dumki, Patuakhali 8602, Bangladesh;2. Department of Forest Products, IALS, Gyeongsang National University, Jinju 660-701, Republic of Korea;3. Department of Soil Science, Patuakhali Science and Technology University, Dumki, Patuakhali 8602, Bangladesh;4. Department of Agricultural Chemistry, Patuakhali Science and Technology University, Dumki, Patuakhali 8602, Bangladesh;1. School of Civil Environmental and Architecture Engineering, Korea University, Seoul 136-701, Republic of Korea;2. Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kulala Lumpur 50603, Malaysia;3. Department of Environmental Engineering, Kumoh National Institute of Technology, Gyungbuk 730-701, Republic of Korea
Abstract:Ultrasonic irradiation (640 kHz) leads to the effective degradation of 5-methyl-benzotriazole (5-MBT) in O2 saturated aqueous solution. Up to 97% of 5-MBT is eliminated within 2 h of treatment. Upon extended treatment of 6 h, UV absorbance of the n  π1 and π  π1 transitions associated with aromatic and conjugated systems are completely removed, indicating complete destruction of the aromatic system in 5-MBT. The decomposition of 5-MBT follows pseudo-first order kinetics and the observed decomposition rate dropped significantly in the presence of tertiary butyl alcohol. Detailed product studies were performed employing a negative mode ESI LC–MS. Twenty eight intermediate products were detected during ultrasonic mediated degradation of 5-MBT. Reaction pathways are proposed based on the structures of products assigned to observed 28 masses from LC–MS and commonly accepted degradation pathways observed by thermal and hydroxyl radical mediated pathways often associated with ultrasonic treatment.
Keywords:5-Methylbenzotriazole  Ultrasonic degradation  LC–MS analyses  Degradation kinetics and mechanisms
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