Improving sono-activated persulfate oxidation using mechanical mixing in a 35-kHz ultrasonic reactor: Persulfate activation mechanism and its application
| Autor: | Zhengchang Han, Mingcan Cui, Junjun Ma, Seo-Joon Lee, Jeonggwan Kim, Yonghyeon Lee, Jeehyeong Khim |
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| Rok vydání: | 2020 |
| Předmět: |
Sulfur radical
Acoustics and Ultrasonics Acoustic cavitation lcsh:QC221-246 Mixing (process engineering) Ibuprofen 02 engineering and technology Activation energy 010402 general chemistry 01 natural sciences lcsh:Chemistry Inorganic Chemistry Reaction rate chemistry.chemical_compound Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging Irradiation Original Research Article Chemistry Mechanical mixing Organic Chemistry 021001 nanoscience & nanotechnology Persulfate 0104 chemical sciences lcsh:QD1-999 Chemical engineering Cavitation lcsh:Acoustics. Sound Degradation (geology) Sonochemiluminescence Hydroxyl radical 0210 nano-technology |
| Zdroj: | Ultrasonics Sonochemistry Ultrasonics Sonochemistry, Vol 72, Iss, Pp 105412-(2021) |
| ISSN: | 1873-2828 |
| Popis: | Highlights • Identification of US/M mechanism for PS activation. • Selection of optimal mechanical mixing using Sonochmeiluminescence in US/M system. • Observation of pH and temperature effects in US/M system using PS oxidizer. • Comparison of IBP oxidation reaction rates in tap water and river water using US-PS/M system. This study investigated the degradation of ibuprofen (IBP), an activated persulfate (PS), when subjected to ultrasonic (US) irradiation and mechanical mixing (M). The effects of several critical factors were evaluated, including the effect of rpm on M, PS concentration, and initial pH, and that of temperature on IBP degradation kinetics and the PS activation mechanism. The resulting IBP oxidation rate constant was significantly higher at 400 rpm. As the PS load increased, the IBP oxidation rate constant increased. The value of the IBP reaction rate increased with decreasing pH; below pH 4.9, there was no significant difference in the IBP oxidation rate constant. The IBP oxidation activation energy when using the US/M-PS system was 18.84 kJ mol−1. In the US/M-PS system, PS activation was the primary effect of temperature at the interface during the explosion of cavitation bubbles. These encouraging results suggest that the US-PS/M process is a promising strategy for the treatment of IBP-based water pollutants. |
| Databáze: | OpenAIRE |
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