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金属矿山 ›› 2009, Vol. 39 ›› Issue (11): 132-135.

• 安全与环保 • 上一篇    下一篇

氢氧化镁对重金属离子铜锌的吸附特性研究

冯雪冬,马艳飞,卢杰   

  1. 山东理工大学
  • 出版日期:2009-11-16 发布日期:2011-04-26
  • 基金资助:

    甘肃省科技攻关项目(编号:GS012-B52-084)。

Study on Adsorption Features of Magnesium Hydroxide on  Heavy Metal Ions of Cu(Ⅱ) and Zn(Ⅱ)

Feng Xuedong,Ma Yanfei,Lu Jie   

  1. Shandong University of Technology
  • Online:2009-11-16 Published:2011-04-26

摘要: 研究氢氧化镁对水中Cu(Ⅱ)和Zn(Ⅱ)的吸附热力学和动力学特性,并对氢氧化镁处理重金属离子废水的效果做了总结。结果表明:氢氧化镁用量为0.35 g/L和0.60 g/L时,处理后Cu(Ⅱ)(12 mg/L)和Zn(Ⅱ)(20 mg/L)浓度均低于国家二类污染物一级排放标准;氢氧化镁对Cu(Ⅱ)和Zn(Ⅱ)具有较强的吸附能力,吸附等温线符合Langmuir模型,饱和吸附量分别为76.92 mg/g和37.04 mg/g,计算得到吸附过程的热力学参数ΔG的值分别为-29.32 kJ/mol和-32.20 kJ/mol;二级动力学方程较好地表征了氢氧化镁吸附Cu(Ⅱ)和Zn(Ⅱ)的动力学特性,相关系数均为1.000;从目前研究结果看,氢氧化镁吸附Ni(Ⅱ),Cd(Ⅱ)和Cr(Ⅲ)等均符合Langmuir模型,且吸附效果明显。  

关键词: 氢氧化镁, 重金属离子, 吸附热力学, 动力学

Abstract: The thermodynamics and kinetics for magnesium hydroxide on adsorption of Cu(Ⅱ) and Zn(Ⅱ) were studied.The effects of magnesium hydroxide on dealing with heavy metal ions in wastewater were summarized.The results showed that the concentrations of Cu(Ⅱ) and Zn(Ⅱ) are below the National Standards for Discharge of Water Pollutants when the dose of magnesium hydroxide are 0.35 g/L and 0.60 g/L.Magnesium hydroxide has a better adsorption capacity of Ⅱ) and Zn(Ⅱ), and the adsorption isotherm accords with Langmuir mode.The maximum adsorption amount is 76.92 mg/g and 37.04 mg/g respectively.Thermodynamic parameter ΔG are -29.32 kJ/mol and -32.20 kJ/mol for Cu(Ⅱ) and Zn(Ⅱ) after calculation.The second-order kinetic equation can well describe the dynamics characteristics of Cu(Ⅱ) and Zn(Ⅱ) absorption with Magnesium Hydroxide with a related coefficient of 1.000.The current research results showed that the adsorption isotherm of Ni(Ⅱ), Cd(Ⅱ) and Cr(Ⅲ) et al with magnesium hydroxide were all consistent with the Langmuir model and the adsorption effects were distinct.

Key words: Magnesium hydroxide, Heavy metal ions, Adsorption thermodynamics, Kinetics