TY - JOUR
T1 - Enhancement effects of chelating agents on the degradation of tetrachloroethene in Fe(III) catalyzed percarbonate system
AU - Miao, Zhouwei
AU - Gu, Xiaogang
AU - Lu, Shuguang
AU - Brusseau, Mark L.
AU - Zhang, Xiang
AU - Fu, Xiaori
AU - Danish, Muhammad
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 (Nos. 41373094 and 51208199 ), and the Fundamental Research Funds for the Central Universities. The contributions of Dr. Mark Brusseau were supported by the NIEHS Superfund Research Program ( P42 ES ES04940 ).
Publisher Copyright:
© 2015 Elsevier B.V.
PY - 2015/12/1
Y1 - 2015/12/1
N2 - The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO radical oxidation in both the chelated and non-chelated systems, while O2- also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO in the first 10min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.
AB - The performance of Fe(III)-based catalyzed sodium percarbonate (SPC) for stimulating the oxidation of tetrachloroethene (PCE) for groundwater remediation applications was investigated. The chelating agents citric acid monohydrate (CIT), oxalic acid (OA), and glutamic acid (Glu) significantly enhanced the degradation of PCE. Conversely, ethylenediaminetetraacetic acid (EDTA) had a negative impact on PCE degradation, which may due to its strong Fe chelation and HO scavenging abilities. However, excessive SPC or chelating agent will retard PCE degradation. In addition, investigations using free radical probe compounds and radical scavengers revealed that PCE was primarily degraded by HO radical oxidation in both the chelated and non-chelated systems, while O2- also participated in the non-chelated system and the OA and Glu modified systems. According to the electron paramagnetic resonance (EPR) studies, the presence of HO in the Fe(III)/SPC system was maintained much longer than that in the Fe(II)/SPC system. The results indicated that the addition of CIT, OA or Glu indeed enhanced the generation of HO in the first 10min and promoted degradation efficiency by increasing the amount of Fe(III) and maintaining the concentration of HO radicals in solution. In conclusion, chelated Fe(III)-based catalyzed SPC oxidation is a promising method for the remediation of PCE-contaminated groundwater.
KW - Chelating agents (CAs)
KW - Groundwater remediation
KW - Hydroxyl radical (HO<sup></sup>)
KW - Sodium percarbonate (SPC)
KW - Tetrachloroethene (PCE)
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U2 - 10.1016/j.cej.2015.06.076
DO - 10.1016/j.cej.2015.06.076
M3 - Article
AN - SCOPUS:84935478641
VL - 281
SP - 286
EP - 294
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -