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Role of reactive oxygen species and effect of solution matrix in trichloroethylene degradation from aqueous solution by zeolite-supported nano iron as percarbonate activator
East China University of Science and Technology, Shanghai, China.
East China University of Science and Technology, Shanghai, China.
East China University of Science and Technology, Shanghai, China.
East China University of Science and Technology, Shanghai, China.
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2016 (English)In: Research on chemical intermediates (Print), ISSN 0922-6168, E-ISSN 1568-5675, Vol. 42, no 9, 6959-6973 p.Article in journal (Refereed) Published
Abstract [en]

The role of reactive oxygen species (ROSs) and effect of solution matrix have been investigated for the degradation of trichloroethylene (TCE). Zeolite-supported nano iron (Z-nZVI) was synthesized as an activator to catalyze sodium percarbonate (SPC) with or without hydroxylamine, i.e. as reducing agent (RA). The probe tests confirmed the generation of OH·and O2−· in the Z-nZVI activated SPC system in absence of the RA, while the presence of RA significantly increased the generation of OH· and O2−· radicals. Scavenger tests demonstrated that OH· was the main ROS responsible for TCE degradation, whereas O2−· also participated in TCE degradation. From the solution matrix perspective, the experimental results confirmed significant scavenging effects of Cl− (1.0, 10.0, and 100 mmol L−1) and HCO3− (1.0 and 10.0 mmol L−1), whereas the scavenging effects were fairly impeded at 100 mmol L−1concentration of HCO3−. On the other hand, a considerable decline in scavenging effect was observed in the presence of RA in tested Cl− and HCO3− concentration ranges. In addition, negligible scavenging effects of NO3− and SO42− anions were found in all tested concentrations. The effect of initial solution pH on catalytic activity indicated a significant increase in the TCE degradation in the presence of RA even at higher pH value of 9. The results indicated that the Z-nZVI activated SPC system in presence of RA can effectively degrade chlorinated organic solvents, but it is important to consider the intensive existence of anions in groundwater.

Place, publisher, year, edition, pages
2016. Vol. 42, no 9, 6959-6973 p.
Keyword [en]
Trichloroethylene (TCE)Solution matrixReactive oxygen species (ROSs)Zeolite supported nano iron particles (Z-nZVI)Groundwater remediation
National Category
Chemical Engineering
Research subject
Energy- and Environmental Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-33503DOI: 10.1007/s11164-016-2509-8ISI: 000385202400013Scopus ID: 2-s2.0-84961794713OAI: oai:DiVA.org:mdh-33503DiVA: diva2:1044894
Available from: 2016-11-07 Created: 2016-11-07 Last updated: 2016-12-27Bibliographically approved

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