TY - JOUR
T1 - Application of ascorbic acid to enhance trichloroethene degradation by Fe(III)-activated calcium peroxide
AU - Zhang, Xiang
AU - Gu, Xiaogang
AU - Lu, Shuguang
AU - Brusseau, Mark L.
AU - Xu, Minhui
AU - Fu, Xiaori
AU - Qiu, Zhaofu
AU - Sui, Qian
N1 - Funding Information:
This study was financially supported by the grant from the National Natural Science Foundation of China (41373094), Natural Science Foundation of Shanghai (16ZR1407200). The contributions of Mark Brusseau were supported by the NIEHS Superfund Research Program (P42 ES04940).
Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO[rad]) that is responsible for TCE degradation. The generation of Cl− from the degraded TCE was complete in the enhanced CP/Fe(III)/AA system. The investigation of solution matrix effects showed that the TCE degradation rate decreases with the increase in solution pH, while Cl−, SO42− and NO3− anions have minor impact. Conversely, HCO3− significantly inhibited TCE degradation due to pH elevation and HO[rad] scavenging. The results of experiments performed using actual groundwater indicated that an increase in reagent doses are required for effective TCE removal. In summary, the potential effectiveness of the CP/Fe(III)/AA oxidation system for remediation of TCE contaminated groundwater has been demonstrated. Additional research is needed to develop the system for practical implementation.
AB - The enhancement effect of an environmentally friendly reducing agent, ascorbic acid (AA), on trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) was evaluated. The addition of AA accelerated the transformation of Fe(III) to Fe(II), and the complexation of Fe(III)/Fe(II) with AA and its products alleviated the precipitation of dissolved iron. These impacts enhanced the generation of reactive oxygen species (ROSs). Investigation of ROSs using chemical probe tests, electron paramagnetic resonance (EPR) tests, and radical scavenger tests strongly confirm large production of hydroxyl radicals (HO[rad]) that is responsible for TCE degradation. The generation of Cl− from the degraded TCE was complete in the enhanced CP/Fe(III)/AA system. The investigation of solution matrix effects showed that the TCE degradation rate decreases with the increase in solution pH, while Cl−, SO42− and NO3− anions have minor impact. Conversely, HCO3− significantly inhibited TCE degradation due to pH elevation and HO[rad] scavenging. The results of experiments performed using actual groundwater indicated that an increase in reagent doses are required for effective TCE removal. In summary, the potential effectiveness of the CP/Fe(III)/AA oxidation system for remediation of TCE contaminated groundwater has been demonstrated. Additional research is needed to develop the system for practical implementation.
KW - Ascorbic acid
KW - Calcium peroxide
KW - Fe(III) reduction
KW - Groundwater remediation
KW - ISCO
KW - Trichloroethene
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U2 - 10.1016/j.cej.2017.05.004
DO - 10.1016/j.cej.2017.05.004
M3 - Article
AN - SCOPUS:85019436414
SN - 1385-8947
VL - 325
SP - 188
EP - 198
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
ER -