Journal
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
Volume 25, Issue 16, Pages 15733-15742Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11356-018-1708-9
Keywords
Sodium percarbonate; Trichloroethylene; Fe(II)-EDDS; Hydroxylamine; Groundwater remediation
Categories
Funding
- National Natural Science Foundation of China [41373094, 21577033, 51208199]
- Natural Science Foundation of Shanghai [16ZR1407200]
- NIEHS Superfund Research Program [P42 ES04940]
- University of Cincinnati through a UNESCO co-Chair Professor position on Water Access and Sustainability
- Herman Schneider Professorship in the College of Engineering and Applied Sciences
- NATIONAL INSTITUTE OF ENVIRONMENTAL HEALTH SCIENCES [P42ES004940] Funding Source: NIH RePORTER
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This study presents a performance comparison of Fe(II)-catalyzed sodium percarbonate (SPC), Fe(II)-EDDS-catalyzed SPC, and of the innovative hydroxylamine hydrochloride (HA)-Fe(II)-EDDS-catalyzed SPC for the degradation of trichloroethylene (TCE) in water. TCE degradation was greater in the Fe(II)-EDDS-catalyzed SPC system compared to the Fe(II)-catalyzed SPC system, indicating the effectiveness of adding EDDS as an enhancement factor for the removal of TCE. Moreover, TCE degradation was faster in the HA-Fe(II)-EDDS-catalyzed SPC system compared to the Fe(II)-EDDS-catalyzed SPC system, illustrating that HA can play a synergistic role in TCE degradation. Analysis of iron distribution in the three systems demonstrated that EDDS addition maintained iron in soluble form, and that the generation of soluble ferrous from ferric iron was expedited with addition of HA. Studies using nitrobenzene and carbon tetrachloride probes provided insights on the generation of hydroxyl radical (HO center dot) and superoxide anion radical (O-2(center dot-)) in the three systems. A gradual increasing contribution of O-2(center dot-) to TCE removal in Fe(II)-catalyzed SPC, Fe(II)-EDDS-catalyzed SPC, and HA-Fe(II)-EDDS-catalyzed SPC systems was verified through free-radical scavenger tests. Finally, monitoring of Cl- concentrations manifested the complete dechlorination of TCE. A possible mechanism of TCE degradation involving two pathways of HO center dot oxidation and O-2(center dot-) reaction was proposed.
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