Application of persulfate with hydrodynamic cavitation and ferrous in the decomposition of pentachlorophenol |
| |
Affiliation: | 1. School of Civil, Environmental, and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;2. Korea Environmental Industry and Technology, 215 Jinheung-no, Eunpyeong-gu, Seoul 03367, Republic of Korea;3. Department of Environmental Engineering, Kumoh National Institute of Technology, 61, Daehak-ro, Gumi, Gyeongsangbuk-do 39177, Republic of Korea;4. National Fusion Research Institute Plasma Technology Research Center, 37 Dongjangsan-ro, Jeollabu-do, Gunsan 54004, Republic of Korea;5. Nanjing Green-Water Environment Engineering Limited by Share Ltd. Ning Six Road No 606 Building C Floor 3, No.606 Ningliu Road, Chemical Industrial District Nanjing, Jiangsu 210047, China |
| |
Abstract: | Hydrodynamic cavitation (HC) and Fe(II) are advanced oxidation processes, in which pentachlorophenol (PCP) is treated by the redox method of activating persulfate (PS). The kinetics and mechanism of the HC and Fe(II) activation of PS were examined in aqueous solution using an electron spin resonance (ESR) spin trapping technique and radical trapping with pure compounds. The optimum ratio of Fe(II)/PS was 1:2, and the hydroxyl radical (HO) and sulfate radical (SO4−) generation rate were 5.56 mM h−1 and 8.62 μM h−1, respectively. The generation rate and Rct of HO and SO4− at pH 3 and 50 °C in the Fe(II)/PS/HC system are 7584.6 μM h−1, 0.013 and 24.02 μM h−1, 3.95, respectively. The number of radicals was reduced as the pH increased, and it increased with increasing temperature. The PCP reaction rate constants was 4.39 × 10−2 min−1 at pH 3 and 50 °C. The activation energy was 10.68 kJ mol−1. In addition, the mechanism of PCP treatment in the Fe(II)/PS/HC system was a redox reaction, and the HO−/SO4− contribution was 81.1 and 18.9%, respectively. In this study, we first examined PCP oxidation through HO and SO4− quantification using only the Fe(II)/PS/HC process. Furthermore, the results provide the foundation for activation of PS by HC and Fe(II), but also provide a data basis for similar organic treatments other than PCP. |
| |
Keywords: | Electron spin resonance Hydrodynamic cavitation Sulfate radical Hydroxyl radical Pentachlorophenol |
本文献已被 ScienceDirect 等数据库收录! |
|