TY - JOUR
T1 - Degradation of trichloroethylene in aqueous solution by nanoscale calcium peroxide in the Fe(II)-based catalytic environments
AU - Sun, Yong
AU - Lyu, Shuguang
AU - Brusseau, Mark L.
AU - Tang, Ping
AU - Jiang, Wenchao
AU - Gu, Mengbin
AU - Li, Ming
AU - Lyu, Yanchen
AU - Qiu, Zhaofu
AU - Sui, Qian
N1 - Funding Information:
This study was financially supported by a grant from the International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee (NO. 18230722700). The contributions of Mark L. Brusseau were supported by the NIEHS Superfund Research Program (PS 42 ES04940).
Funding Information:
This study was financially supported by a grant from the International Academic Cooperation and Exchange Program of Shanghai Science and Technology Committee (NO. 18230722700 ). The contributions of Mark L. Brusseau were supported by the NIEHS Superfund Research Program ( PS 42 ES04940 ).
Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2019/11/1
Y1 - 2019/11/1
N2 - In this study, nCaO2 was synthesized successfully and applied in the Fe(II)-based catalytic environments in investigating trichloroethylene (TCE)removal performance. nCaO2 with the particle sizes in the range of 50–200 nm was prepared, and it performed better for TCE removal when compared to the conventional CaO2. Further experimental results showed that 70.4% of TCE could be removed in 180 min at the nCaO2/Fe(II)/TCE molar ratio of 1/2/1, while this data was elevated to 86.1% in the presence of citric acid (CA)at the nCaO2/Fe(II)/CA/TCE molar ratio of 1/2/2/1 in the same test period. Probe compound tests, specifically designed for free radicals confirmation, demonstrated the presence of HO[rad] and O2−[rad]. Moreover, scavenging tests indicated that HO[rad] was the major radical responsible for TCE degradation but O2−[rad] promoted the removal of TCE in both nCaO2/Fe(II)and nCaO2/Fe(II)-CA system. In addition, the effects of initial solution pH and anions (Cl−, HCO3−)were also evaluated. The performance of TCE degradation in actual groundwater demonstrated that both nCaO2/Fe(II)and nCaO2/Fe(II)-CA systems can be applicable for TCE removal in ISCO practice and the nCaO2/Fe(II)-CA system is much promising technique. These fundamental data strongly confirmed the feasibility and potential of nCaO2 based technique in the remediation of TCE contaminated groundwater.
AB - In this study, nCaO2 was synthesized successfully and applied in the Fe(II)-based catalytic environments in investigating trichloroethylene (TCE)removal performance. nCaO2 with the particle sizes in the range of 50–200 nm was prepared, and it performed better for TCE removal when compared to the conventional CaO2. Further experimental results showed that 70.4% of TCE could be removed in 180 min at the nCaO2/Fe(II)/TCE molar ratio of 1/2/1, while this data was elevated to 86.1% in the presence of citric acid (CA)at the nCaO2/Fe(II)/CA/TCE molar ratio of 1/2/2/1 in the same test period. Probe compound tests, specifically designed for free radicals confirmation, demonstrated the presence of HO[rad] and O2−[rad]. Moreover, scavenging tests indicated that HO[rad] was the major radical responsible for TCE degradation but O2−[rad] promoted the removal of TCE in both nCaO2/Fe(II)and nCaO2/Fe(II)-CA system. In addition, the effects of initial solution pH and anions (Cl−, HCO3−)were also evaluated. The performance of TCE degradation in actual groundwater demonstrated that both nCaO2/Fe(II)and nCaO2/Fe(II)-CA systems can be applicable for TCE removal in ISCO practice and the nCaO2/Fe(II)-CA system is much promising technique. These fundamental data strongly confirmed the feasibility and potential of nCaO2 based technique in the remediation of TCE contaminated groundwater.
KW - Citric acid (CA)
KW - Fe(II)activation
KW - Groundwater remediation
KW - Nano-calcium peroxide (nCaO)
KW - Trichloroethylene (TCE)
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U2 - 10.1016/j.seppur.2019.05.075
DO - 10.1016/j.seppur.2019.05.075
M3 - Article
AN - SCOPUS:85067922345
SN - 1383-5866
VL - 226
SP - 13
EP - 21
JO - Separation and Purification Technology
JF - Separation and Purification Technology
ER -