Fe/Cu双金属可渗透反应墙体系对Cr(VI)的去除研究
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X52

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国家自然科学基金(21777131);四川省科技支撑计划(2018SZDZX0026)


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

    基于零价铁可渗透反应墙技术,采用化学沉积法制备了Fe/Cu双金属颗粒材料,对Fe/Cu材料进行表征,发现其表观非均匀,化学组成为Cu涂覆在铁颗粒表面;通过静态试验系统地考察了反应温度、溶液pH值、平均流速、等温吸附、双金属材料与河砂的配比等条件对Cr(Ⅵ)去除效果的影响,同时调节进水流速,实现了动态试验的模拟。Cr(Ⅵ)去除的静态试验表明,当mFe:mCu=10:2、投加量40 mg/mL、Cr(Ⅵ)初始浓度50 mg/L、pH=7.5、反应温度298 K时,对水中Cr(Ⅵ)的去除效果最佳,在反应15 min左右时,对Cr(Ⅵ)去除率高达99.4%;动态试验表明,快流速组(104 mL/h)的Cr(Ⅵ)的平均吸附量为0.869 mg/g,慢流速组(28 mL/h)的Cr(Ⅵ)平均吸附量为0.920 mg/g,慢流速组的总吸附量较高。采用Langmuir和Freundlich模型拟合表明,该吸附反应属于单层吸附过程,且升温有利于该吸附反应的进行。实现了Fe/Cu双金属颗粒材料的制备,并对Cr(Ⅵ)有很好的去除效果,结合PRB技术,有望实现地下水等水体中Cr(Ⅵ)的有效去除。

    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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  • 收稿日期:2020-05-05
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  • 在线发布日期: 2020-11-26
  • 出版日期: 2020-12-31