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Effect of solution matrix and pH in Z-nZVI-catalyzed percarbonate system on the generation of reactive oxygen species and degradation of 1,1,1-trichloroethane
East China Univ Sci & Technol, Peoples R China..
East China Univ Sci & Technol, Peoples R China..
East China Univ Sci & Technol, Peoples R China..
East China Univ Sci & Technol, Peoples R China..
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2017 (English)In: Water Science and Technology: Water Supply, ISSN 1606-9749, E-ISSN 1607-0798, Vol. 17, no 6, p. 1568-1578Article in journal (Refereed) Published
Abstract [en]

This study primarily focuses on evaluating the effects of solution matrix and pH for the generation of reactive oxygen species (ROSs) in a Z-nZVI-catalyzed sodium percarbonate (SPC) system to degrade 1,1,1-trichloroethane (1,1,1-TCA) in the absence and presence of a reducing agent (RA), i.e. hydroxylamine. Degradation of 1,1,1-TCA was 49.5% and 95% in the absence and presence of RA. Probe tests confirmed the generation of major hydroxyl radicals (OH center dot) and minor superoxide species (O-2(-center dot)), and scavenger tests verified the key role of OH center dot and less of O-2(-center dot) radicals. Degradation of 1,1,1-TCA decreased significantly in the presence of Cl- and HCO3-, while NO3- and SO42- had negligible effects in the absence of RA. Addition of RA significantly enhanced 1,1,1-TCA degradation by generating more OH center dot and O-2(-center dot) radicals in the presence of anions. Degradation of 1,1,1-TCA increased in the acidic range (1-5), while an inhibitive trend from neutral to basic (7-9) was observed. In contrast, a significant increase in 1,1,1-TCA degradation was observed with the addition of RA at all pH values (1-9). In conclusion, the anions and pH significantly influenced the generation and intensity of ROSs and 1,1,1-TCA was effectively degraded in the Z-nZVI-catalyzed SPC system in the presence of RA.

Place, publisher, year, edition, pages
London, UK: IWA PUBLISHING , 2017. Vol. 17, no 6, p. 1568-1578
Keywords [en]
groundwater remediation, hydroxylamine, nano-scale composite, reactive oxygen species, sodium percarbonate, solution matrix
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-74902DOI: 10.2166/ws.2017.060ISI: 000417947000008OAI: oai:DiVA.org:kau-74902DiVA, id: diva2:1355973
Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-10-17Bibliographically approved

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Naqvi, Muhammad

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