TY - JOUR
T1 - Ultrasound-assisted heterogeneous activation of peroxymonosulphate by natural pyrite for 2,4-diclorophenol degradation in water
T2 - Synergistic effects, pathway and mechanism
AU - Diao, Zeng Hui
AU - Lin, Zi Yu
AU - Chen, Xi Zhen
AU - Yan, Liu
AU - Dong, Fu Xin
AU - Qian, Wei
AU - Kong, Ling Jun
AU - Du, Jian Jun
AU - Chu, Wei
PY - 2020/6/1
Y1 - 2020/6/1
N2 - In this paper, the natural pyrite was firstly used as peroxymonosulphate (PMS) activator in conjunction with ultrasonic irradiation (US) for 2,4-dichlorophenol (2,4-DCP) degradation in water. The most relevant findings indicated that a superior degradation of 2,4-DCP has been successfully achieved in pyrite/PMS/US system compared with pyrite/PMS and/or pyrite/US systems, which involved a synergistic effect between sonolysis and Fenton-like reaction. Within 120 min, nearly 98% of 2,4-DCP could be degraded at optimum reaction conditions of pyrite 1.00 g L−1, 2,4-DCP 10 mg L−1, PMS 2.00 mM and pH 4.02. A significantly enhanced PMS decomposition was probably ascribed to the sonochemistry (PMS/US and pyrite/US systems) and catalytic chemistry (pyrite/PMS system) under acidic conditions. Both SO4 [rad]− and HO[rad] took part in reaction process, while the SO4 [rad]− was dominant for 2,4-DCP degradation. A total of six intermediate products including 3,5-dichlorocatechol, 2-chlorophenol, 4-chlorocatechol, hydroquinone, maleic acid and oxalic acid were identified using GC/MS analyses to clarify the possible degradation pathways, which involved hydroxylation and substitution reactions. Compared to other Fenton reaction systems, both maximum degradation and mineralization levels of 2,4-DCP have been obtained from pyrite/PMS/US system. This study provides an interesting insight for PMS activation by the natural mineral-based catalyst with US irradiation for in situ organic pollutants remediation.
AB - In this paper, the natural pyrite was firstly used as peroxymonosulphate (PMS) activator in conjunction with ultrasonic irradiation (US) for 2,4-dichlorophenol (2,4-DCP) degradation in water. The most relevant findings indicated that a superior degradation of 2,4-DCP has been successfully achieved in pyrite/PMS/US system compared with pyrite/PMS and/or pyrite/US systems, which involved a synergistic effect between sonolysis and Fenton-like reaction. Within 120 min, nearly 98% of 2,4-DCP could be degraded at optimum reaction conditions of pyrite 1.00 g L−1, 2,4-DCP 10 mg L−1, PMS 2.00 mM and pH 4.02. A significantly enhanced PMS decomposition was probably ascribed to the sonochemistry (PMS/US and pyrite/US systems) and catalytic chemistry (pyrite/PMS system) under acidic conditions. Both SO4 [rad]− and HO[rad] took part in reaction process, while the SO4 [rad]− was dominant for 2,4-DCP degradation. A total of six intermediate products including 3,5-dichlorocatechol, 2-chlorophenol, 4-chlorocatechol, hydroquinone, maleic acid and oxalic acid were identified using GC/MS analyses to clarify the possible degradation pathways, which involved hydroxylation and substitution reactions. Compared to other Fenton reaction systems, both maximum degradation and mineralization levels of 2,4-DCP have been obtained from pyrite/PMS/US system. This study provides an interesting insight for PMS activation by the natural mineral-based catalyst with US irradiation for in situ organic pollutants remediation.
KW - 2,4-dichlorophenol
KW - Fenton reaction
KW - Peroxymonosulphate
KW - Pyrite
KW - Sulfate radicals
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85076577023&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.123771
DO - 10.1016/j.cej.2019.123771
M3 - Journal article
AN - SCOPUS:85076577023
VL - 389
JO - Chemical Engineering Journal and the Biochemical Engineering Journal
JF - Chemical Engineering Journal and the Biochemical Engineering Journal
SN - 1385-8947
M1 - 123771
ER -