Study on the preparation of active iron and its characteristics for wastewater treatment
In this paper,the preparation method of active iron was optimized,the characteristics and mecha-nism of using active iron system to treat wastewater containing humic acid,chromium or nickel were stud-ied,and the active iron and its reaction products were characterized by XRD,FTIR and SEM.The results indicated that:(1)The optimal active iron was obtained by first blowing nitrogen for 5 minutes and then reacting in a shaker for 7 hours.The surface of zero-valent iron was basically covered by fluffy Fe3O4 parti-cles with a particle size of 50～100nm.(2)The mixed presence of Fe0,Fe2+,Fe3O4 and other iron(hydro-gen)oxides in the active iron system had a synergistic effect on the removal of humic acid.The removal rate of humic acid could be increased from 70.1％to 99.3％by strengthening Fe2+in the stock solution.(3)The removal efficiencies of heavy metals chromium and nickel by the active iron system were close to 100％.The removal of hexavalent chromium mainly relied on the oxidation-reduction reaction between zero valent iron and hexavalent chromium,while divalent nickel was mainly removed by the adsorption of Fe3O4 in active iron and the formation of stable nickel hydroxide precipitation through the reaction with divalent iron.
active ironhumic acidchromiumnickelwastewater treatment
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