Coumarin fluorometry to quantitatively detectable OH radicals in ultrasound aqueous medium |
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| Affiliation: | 1. School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, PR China;2. Key Laboratory for Functional Material, Educational Department of Liaoning Province, University of Science and Technology Liaoning, Anshan 114051, PR China;3. State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian High-Tech Industrial Zone 116024, PR China;1. School of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST), 123 Cheomdan-gwagiro, Buk-gu, Gwangju 500-712, Republic of Korea;2. Fraunhofer Institute for Solar Energy System (ISE), Heidenhofstrasse 2, 79110 Freiburg, Germany;3. Nonproliferation System Research Division, Korea Atomic Energy Research Institute (KAERI), 989-111 Daedeok-daero, Yuseong-gu, Daejeon, Republic of Korea;4. Department of Environmental Engineering, Sangmyung University, 300 Anseo-dong, Dongnam-gu, Cheonan-si, Chungnam Province 330-720, Republic of Korea;1. Key Laboratory of Structures Dynamic Behavior and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, People’s Republic of China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, People’s Republic of China;3. State Key Laboratory of Urban Water Resources and Environment, Harbin Institute of Technology, Harbin 150090, People’s Republic of China;4. National Engineering Research Center of Urban Water Resource and Environment, Harbin 150090, People’s Republic of China;5. School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, People’s Republic of China;1. Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan, 430074, PR China;2. College of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China;1. School of Chemistry and Chemical Engineering, Queen''s University Belfast, Belfast BT9 5AG, United Kingdom;2. School of Biological Sciences, Queen''s University Belfast, Medical Biology Centre, Belfast BT9 7BL, United Kingdom |
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| Abstract: | When ultrasound (US) was exposed to aqueous coumarin solution in air atmosphere, the UV–visible and fluorescence spectra of the probe were measured at different US exposure times. The US exposure was carried out at 43 kHz and 500 kHz with different out-put power. It was found that the 500 kHz US produced umbelliferone fluorescence, while the 43 kHz US had no fluorescence. In addition, the coumarin absorbance at 270 nm maximum was decreased with in cases of the US exposure time. In contrary, the fluorescent intensity of umbelliferone at 460 nm increased with increasing of US exposure time. This exhibited that the coumarin probe was converted to umbelliferone by the US exposure, when the 500 kHz US was operated. This was facted that the coumarin framework was caused with addition of OH groups which was generated by the 500 kHz US. Therefore, the umbelliferone fluorescent became a probe to estimate OH radical in US medium. Furthermore, the chemo-fluorometry showed that the emission maximum of the formed umbelliferone could probe the bulk pHs in the US aqueous medium. |
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| Keywords: | Ultrasound Hydroxyl radical Ultrasound aqueous medium Coumarin Umbelliferone Chemo-fluorometry of the coumarin |
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