TY - JOUR
T1 - Application of persulfate with hydrodynamic cavitation and ferrous in the decomposition of pentachlorophenol
AU - Choi, Jongbok
AU - Cui, Mingcan
AU - Lee, Yonghyeon
AU - Kim, Jeonggwan
AU - Son, Younggyu
AU - Lim, Junghyun
AU - Ma, Junjun
AU - Khim, Jeehyeong
N1 - Funding Information:
This work was supported by National Research Foundation (NRF) of Korea (No. 2017R1D1A1B03030079 and 2019R1I1A1A01059501 ) and the Korean Ministry of the Environment as a Subsurface Environment Management( SEM ) project (No. 2018002480009 and No. 2019002480001 ). In addition, this work was supported by the R&D Program of “Plasma Advanced Technology for Agriculture and Food” through the National Fusion Research Institute of Korea, and the Nanjing Science and Technology Program of International co-operation in industrial technology research and development in China ( 201911003 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2020/9
Y1 - 2020/9
N2 - 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[rad]) and sulfate radical (SO4 [rad] −) generation rate were 5.56 mM h−1 and 8.62 μM h−1, respectively. The generation rate and Rct of HO[rad] and SO4 [rad]− 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[rad]−/SO4 [rad]− contribution was 81.1 and 18.9%, respectively. In this study, we first examined PCP oxidation through HO[rad] and SO4 [rad]− 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.
AB - 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[rad]) and sulfate radical (SO4 [rad] −) generation rate were 5.56 mM h−1 and 8.62 μM h−1, respectively. The generation rate and Rct of HO[rad] and SO4 [rad]− 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[rad]−/SO4 [rad]− contribution was 81.1 and 18.9%, respectively. In this study, we first examined PCP oxidation through HO[rad] and SO4 [rad]− 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.
KW - Electron spin resonance
KW - Hydrodynamic cavitation
KW - Hydroxyl radical
KW - Pentachlorophenol
KW - Sulfate radical
UR - http://www.scopus.com/inward/record.url?scp=85082860993&partnerID=8YFLogxK
U2 - 10.1016/j.ultsonch.2020.105106
DO - 10.1016/j.ultsonch.2020.105106
M3 - Article
C2 - 32247235
AN - SCOPUS:85082860993
SN - 1350-4177
VL - 66
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
M1 - 105106
ER -