D-nZZVI attached to the surface of iron sulfide precipitate and remediation method of contaminated s

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PURPOSE : Dithionite-mediated nanoscale zerovalent iron(D-nZVI) with ferrous sulfide precipitate on the surface and a method for purifying polluted soil and underground environmental pollutants using the same are provided to synthesize nanoscale zerovalent iron by adding dithionite to a sodium borohydride method. CONSTITUTION : Ferrous sulfide precipitate is deposited on the surface of D-nZVI. The specific surface are of the D-nZVI is larger than the specific surface are of nZVI and is between 4 and 60m^2/g. The surface roughness of the D-nZVI is between 40 and 50nm and is larger than the surface roughness of the nZVI. The electric conductivity of the D-nZVI is 6times more than the electric conductivity of the nZVI. A method for manufacturing the D-nZVI includes a process in which sodium dithionite is added into a sodium borohydride reducing agent to deposit the ferrous sulfide precipitate on the surface of nZVI.