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IN-SITU REDUCTIVE DEGRADATION OF CHLORINATED DNAPLS IN CONTAMINATED GROUNDWATER USING POLYETHYLENEIMINE-MODIFIED ZERO-VALENT IRON NANOPARTICLES
Mdlovu, N.V., K.S. Lin, C.Y. Chen, F.A. Mavuso, S.C. Kunene, and M.J. Carrera Espinoza.
Chemosphere 224: 816-826(2019)
Direct injection of polyethyleneimine-coated zero-valent iron nanoparticles (PEI-ZVIN) was field-tested to facilitate the reduction of TCE, PCE, and 1,2-DCE DNAPL contaminants in low-permeability media in situ. The test was conducted at a petrochemical company situated in the Miaoli County of Northern Taiwan that discharged significant amounts of DNAPLs. After in-situ injection and one-day of reaction with groundwater contaminants, ZVIN was further characterized to examine its efficacy in the reduction of pollutants. After the direct injection of PEI-ZVIN, a notable reduction in the concentration of DNAPLs was recorded with the conversion from toxic to non-toxic substances. The use of resistivity image profiling technique suggested similar conductivity data for the PEI-ZVIN suspension and groundwater samples. X-ray absorption near-edge structure and X-ray absorption fine structure studies depicted that the oxidation of ZVIN and PEI-ZVIN was occurring after the reductive reaction with contaminated groundwater. The reacted samples had bond distance values of 1.98, 2.00, 1.96, and 1.94 Å.
Chemosphere 224: 816-826(2019)
Direct injection of polyethyleneimine-coated zero-valent iron nanoparticles (PEI-ZVIN) was field-tested to facilitate the reduction of TCE, PCE, and 1,2-DCE DNAPL contaminants in low-permeability media in situ. The test was conducted at a petrochemical company situated in the Miaoli County of Northern Taiwan that discharged significant amounts of DNAPLs. After in-situ injection and one-day of reaction with groundwater contaminants, ZVIN was further characterized to examine its efficacy in the reduction of pollutants. After the direct injection of PEI-ZVIN, a notable reduction in the concentration of DNAPLs was recorded with the conversion from toxic to non-toxic substances. The use of resistivity image profiling technique suggested similar conductivity data for the PEI-ZVIN suspension and groundwater samples. X-ray absorption near-edge structure and X-ray absorption fine structure studies depicted that the oxidation of ZVIN and PEI-ZVIN was occurring after the reductive reaction with contaminated groundwater. The reacted samples had bond distance values of 1.98, 2.00, 1.96, and 1.94 Å.
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