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Frontiers of Environmental Science & Engineering

Front. Environ. Sci. Eng.    2016, Vol. 10 Issue (3) : 502-512     https://doi.org/10.1007/s11783-016-0838-x
RESEARCH ARTICLE |
Enhanced degradation of trichloroethene by calcium peroxide activated with Fe(III) in the presence of citric acid
Xiang ZHANG1,Xiaogang GU1,Shuguang LU1,*(),Zhouwei MIAO1,2,Minhui XU1,Xiaori FU1,Muhammad DANISH1,Mark L. BRUSSEAU2,Zhaofu QIU1,Qian SUI1
1. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai 200237, China
2. Soil, Water and Environmental Science Department, School of Earth and Environmental Sciences, The University of Arizona, 429 Shantz Building, Tucson, AZ 85721, United States
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Abstract

Trichloroethene (TCE) degradation by Fe(III)-activated calcium peroxide (CP) in the presence of citric acid (CA) in aqueous solution was investigated. The results demonstrated that the presence of CA enhanced TCE degradation significantly by increasing the concentration of soluble Fe(III) and promoting H2O2 generation. The generation of HO? and O2-? in both the CP/Fe(III) and CP/Fe(III)/CA systems was confirmed with chemical probes. The results of radical scavenging tests showed that TCE degradation was due predominantly to direct oxidation by HO?, while O2-? strengthened the generation of HO? by promoting Fe(III) transformation in the CP/Fe(III)/CA system. Acidic pH conditions were favorable for TCE degradation, and the TCE degradation rate decreased with increasing pH. The presence of Cl-, HCO3-, and humic acid (HA) inhibited TCE degradation to different extents for the CP/Fe(III)/CA system. Analysis of Cl- production suggested that TCE degradation in the CP/Fe(III)/CA system occurred through a dechlorination process. In summary, this study provided detailed information for the application of CA-enhanced Fe(III)-activated calcium peroxide for treating TCE contaminated groundwater.

Keywords calcium peroxide      trichloroethene (TCE)      citric acid      ferric ion      free radicals      oxidation     
Corresponding Authors: Shuguang LU   
Online First Date: 31 March 2016    Issue Date: 05 April 2016
 Cite this article:   
Xiang ZHANG,Xiaogang GU,Shuguang LU, et al. Enhanced degradation of trichloroethene by calcium peroxide activated with Fe(III) in the presence of citric acid[J]. Front. Environ. Sci. Eng., 2016, 10(3): 502-512.
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http://journal.hep.com.cn/fese/EN/10.1007/s11783-016-0838-x
http://journal.hep.com.cn/fese/EN/Y2016/V10/I3/502
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Xiang ZHANG
Xiaogang GU
Shuguang LU
Zhouwei MIAO
Minhui XU
Xiaori FU
Muhammad DANISH
Mark L. BRUSSEAU
Zhaofu QIU
Qian SUI
Fig.1  TCE degradation in CP/Fe(III) system at various CP/Fe(III)/TCE molar ratios ([TCE]0 = 0.15 mmol·L-1)
Fig.2  Effect of CA dosage on TCE degradation in CP/Fe(III)/CA system ([TCE]0 = 0.15 mmol?L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1)
Fig.3  Variations of H2O2 in CP/Fe(III) and CP/Fe(III)/CA systems ([TCE]0 = 0.15 mmol·L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1, [CA]0 = 0.30 mmol·L-1)
Fig.4  Degradation of probe compounds in CP/Fe(III)/CA system ([NB]0 = 0.30 mmol·L-1, [CT]0 = 0.01 mmol·L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1, [CA]0 = 0.30 mmol·L-1)
Fig.5  Effect of radical scavengers on TCE degradation in CP/Fe(III)/CA system ([TCE]0 = 0.15 mmol·L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1, [CA]0 = 0.30 mmol·L-1)
Fig.6  Effect of solution matrix on TCE degradation ([TCE]0 = 0.15 mmol·L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1, [CA]0 = 0.30 mmol·L-1)
Fig.7  Comparison of TCE degradation in ultrapure water and real groundwater ([TCE]0 = 0.15 mmol·L-1)
Fig.8  Cl- production in CP/Fe(III)/CA system along with TCE degradation ([TCE]0 = 0.15 mmol·L-1, [CP]0 = 0.60 mmol·L-1, [Fe(III)]0 = 1.20 mmol·L-1, [CA]0 = 0.30 mmol·L-1)
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