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    铬酸根离子在羟基铁离子—蒙脱石体系中的吸附行为研究

    廖立兵 FraserDonald G.

    廖立兵, FraserDonald G., 2002. 铬酸根离子在羟基铁离子—蒙脱石体系中的吸附行为研究. 地球科学, 27(5): 584-591.
    引用本文: 廖立兵, FraserDonald G., 2002. 铬酸根离子在羟基铁离子—蒙脱石体系中的吸附行为研究. 地球科学, 27(5): 584-591.
    LIAO Li-bing, Fraser Donald G., 2002. Adsorption of Chromate in System Hydroxy-Fe-montmorillonite. Earth Science, 27(5): 584-591.
    Citation: LIAO Li-bing, Fraser Donald G., 2002. Adsorption of Chromate in System Hydroxy-Fe-montmorillonite. Earth Science, 27(5): 584-591.

    铬酸根离子在羟基铁离子—蒙脱石体系中的吸附行为研究

    基金项目: 

    国家自然科学基金 49973028

    详细信息
      作者简介:

      廖立兵(1963-), 男, 矿物学博士, 教授, 博士生导师, 主要从事矿物表面、矿物材料学研究

    • 中图分类号: P579;P578.8

    Adsorption of Chromate in System Hydroxy-Fe-montmorillonite

    • 摘要: 采矿、电镀、制革等行业废物排放及含Cr矿物风化可造成一些地区土壤和地下水的Cr污染.Cr主要以三价和六价形式存在, 其中Cr (Ⅵ) 有强的迁移能力, 对动植物均有很强的毒害性.研究了在氧化、酸性条件下, 土壤及土壤溶液中的蒙脱石和羟基铁离子共存时对铬酸根离子(主要以HCrO42-和CrO42-等Cr (Ⅵ) 形式存在) 的吸附行为.进行了蒙脱石、羟基铁离子、Cr (Ⅵ) 离子添加顺序不同的3个系列的实验, 重点研究了Cr的初始质量浓度、溶液pH值、环境温度、吸附时间、溶液离子强度对3个系列Cr吸附行为的影响, 并与羟基铁离子体系进行了对比.结果表明, 蒙脱石-羟基铁离子体系的Cr吸附能力明显强于蒙脱石而低于羟基铁离子, 其Cr吸附率随Cr初始质量浓度、温度的升高和吸附时间的延长而降低, 随离子强度的升高而升高, 而pH值对不同系列的Cr吸附率有不尽相同的影响.

       

    • 图  1  羟基铁离子—蒙脱石体系中Cr吸附率随Cr初始质量浓度(a)、pH值(c) 的变化以及Cr吸附量随Cr加入量(b) 的变化

      Fig.  1.  Percentage adsorption of Cr as functions of initial Cr concentration (a) and pH (c), and total amount of adsorbed Cr as a function of initial amount of Cr in hydroxy-Fe-montmorillonite system

      图  2  羟基铁离子—蒙脱石体系的Cr吸附率随离子强度(a)、温度(b) 和吸附时间(c) 的变化

      Fig.  2.  Percentage adsorption of Cr in hydroxy-Fe-montmorillonite system as functions of ionic strength (a), temperature (b) and adsorption time (c)

      图  3  羟基铁离子—蒙脱石体系吸附Cr后溶液中的剩余Fe浓度随吸附时间的变化(只显示系列2, 4)

      Fig.  3.  Fe remained in solution after adsorption of Cr by hydroxy-Fe-montmorillonite system for different adsorption duration (only series 2 and 4 shown)

      表  1  蒙脱石用量对羟基离子-蒙脱石体系Cr吸附率的影响

      Table  1.   Influence of montmorillonite dosage on the percentage adsorption of Cr in hydroxy-Fe-montmorillonite system

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    出版历程
    • 收稿日期:  2002-06-11
    • 刊出日期:  2002-09-25

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