Research on the removal of hexavalent chromium by iron-copper bimetallic permeable reactive barrier system
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    Abstract:

    Based on the advantages of zero-valent iron permeable reactive barrier (PRB) technology, Fe/Cu bimetal materials were prepared by thechemical deposition method in this study. The Fe/Cu materials was non-uniform particles, and the chemical composition was Cu coated on the surface of iron particle. Through static test systematically examines the reaction temperature, solution pH, average flow velocity, isothermal adsorption, and of the ratio bimetallic material to river sand, etc, the effects of the Cr(Ⅵ) remove and adjust the water flow to realize the simulation of the dynamic test. Cr(Ⅵ) to remove the static experiments show that when the mFe:mCu=10:2, dosing quantity of 40 mg/mL, Cr(Ⅵ) initial concentration was 50 mg/L, pH=7.5, temperature 298 K, the removal of Cr(Ⅵ) in water effect is best, in about 15 min reaction of Cr(Ⅵ) remove rate as high as 99.4%; Dynamic experiments show that the group velocities (104 mL/h) Cr(Ⅵ) adsorption amount to an average of 0.869 mg/g, slow velocity group (28mL/h) adsorption of Cr(Ⅵ) average of 0.920 mg/g, the total adsorption from the slow group velocity is higher. The results of theLangmuirmodel and Freundlichmodel show that the adsorption reaction belongs to the monolayer adsorption process, and the temperature rise is conducive to the adsorption reaction. This study realized the preparation of Fe/Cu bimetal, and the Cr(Ⅵ) has good removal efficiency, combining withPRB technology, to realize the groundwater water such as the effective removal and application of Cr(Ⅵ).

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孙东,沈莉萍,张志鹏,熊亭亭,曹楠,龚正君. Fe/Cu双金属可渗透反应墙体系对Cr(VI)的去除研究[J].土木与环境工程学报(中英文),2020,42(6):165~171

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History
  • Received:May 05,2020
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  • Online: November 26,2020
  • Published: December 31,2020
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