| 凹凸棒石与Ni2+的长期吸附作用 |
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| 引用本文： | 谢晶晶,陈天虎,高薇,庆承松,谢巧勤.凹凸棒石与Ni2+的长期吸附作用[J].矿物学报,2009,29(2). |
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| 作者姓名： | 谢晶晶 陈天虎 高薇 庆承松 谢巧勤 |
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| 作者单位： | 合肥工业大学,资源与环境工程学院,安徽,合肥230009 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 以Ni2+为例研究了凹凸棒石与重金属离子长期作用过程,探讨了重金属离子在凹凸棒石上的吸附反应动力学,并运用高分辨透射电镜揭示了凹凸棒石与重金属离子互相作用引起重金属离子水解沉淀、形成氢氧化物或层状双氢氧化物次生物相的现象.实验表明,凹凸棒石-Ni2+水悬浮体系中,随着时间的延长溶液的pH值逐渐升高,Ni2+浓度逐渐降低,并且长期作用后悬浮液的pH值和重金属离子浓度受到固/液比控制.Ni2+在凹凸棒石和水两相中的分配在长达40 d的时间内都没有达到完全平衡,表明凹凸棒石-Ni2+水悬浮体系中存在凹凸棒石与重金属离子长期互相作用.凹凸棒石与Ni2+长期作用Ni2+浓度变化可以用抛物线扩散方程、双常数方程、一级扩散方程、Elovich方程较好地拟合.凹凸棒石与重金属的长期作用反应机制可能是由于凹凸棒石纳米效应和反应活性,表面缓慢水化导致含重金属离子溶液pH值缓慢升高,诱导了Ni2+在凹凸棒石表面沉淀,在凹凸棒石表面形成了氢氧化物或层状双氢氧化物.
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| 关 键 词： | 凹凸棒石 重金属离子 吸附 长期作用 |
LONG-TERM INTERACTION BETWEEN PALYGORSKTE AND Ni2+ |
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| XIE Jing-jing,CHEN Tian-hu,GAO Wei,QING Cheng-song,XIE Qiao-qin.LONG-TERM INTERACTION BETWEEN PALYGORSKTE AND Ni2+[J].Acta Mineralogica Sinica,2009,29(2). |
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| Authors: | XIE Jing-jing CHEN Tian-hu GAO Wei QING Cheng-song XIE Qiao-qin |
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| Abstract: | The long-term interaction between palygorskite and nickel ions was studied and sorption kinetics of nickel ions on palygorskite was discussed. The hydrolytic precipitation of nickel ions on the surface of palygorskite caused by the interaction between palygorskite and heavy metal ions and the formation of hydroxide and/or layer double hydroxide were investigated with TEM. The results showed that the pH of solution rose and Ni2+ concentrations decreased with time in the suspended system of palygorskite-heavy metal ions. The pH value and Ni2+ concentrations of suspended solution were effected by the ratio of solid over liquid. The distribution of Ni2+ between the two phases (palygorskite and solution) was not in equilibrium with interaction after 40 days. The long-term interaction between heavy metal ions and palygorskite could be well fitted with parabola, two-constant, first-order diffusion and Elovich equations. Reaction mechanism of long-term interaction between palygorskite and Ni2+ solution is presumed that surface hydrolysis of palygorskite slowly cauces pH increase of solution, which induces the hydrolysis of Ni2+ and hydroxide or layer double hydroxide is formed on the surface of palygorskite. |
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| Keywords: | palygorskite heavy metal ion absorption long-term reaction |
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