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骨炭对Pb(Ⅱ)的吸附特性

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张金利, 刘大伟, 杨庆. 骨炭对Pb(Ⅱ)的吸附特性[J]. 环境工程学报, 2014, 8(5): 1784-1790.
引用本文: 张金利, 刘大伟, 杨庆. 骨炭对Pb(Ⅱ)的吸附特性[J]. 环境工程学报, 2014, 8(5): 1784-1790.
shu
Zhang Jinli, Liu Dawei, Yang Qing. Adsorption behaviors of bone char to heavy metal Pb(Ⅱ)[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1784-1790.
Citation: Zhang Jinli, Liu Dawei, Yang Qing. Adsorption behaviors of bone char to heavy metal Pb(Ⅱ)[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1784-1790.
shu

骨炭对Pb(Ⅱ)的吸附特性

  • 1.

    大连理工大学岩土工程研究所, 大连 116024

  • 基金项目:

    国家自然科学基金资助项目（51179023）

  • 中图分类号: X703

Adsorption behaviors of bone char to heavy metal Pb(Ⅱ)

  • 1.

    Institute of Geotechnical Engineering, Dalian University of Technology, Dalian 116024, China

  • Fund Project:

  • 摘要: 通过间歇实验研究了骨炭对重金属Pb（Ⅱ）的吸附特性。探讨了固液比、pH、离子强度、反应时间、温度及初始浓度等因素的影响。实验结果表明，pH与固液比显著影响去除率，温度与离子强度的影响较小。当温度为20℃，pH=2.5，Pb（Ⅱ）的初始浓度为200 mg/L，固液比为1 g/L时，最大去除率近100%。动力学实验结果表明，骨炭对Pb（Ⅱ）的吸附为快速反应，在30 min内可达到平衡，准二级动力学模型可较好地拟合实验结果。等温吸附实验结果表明，Freundlich模型与Langmuir模型均可较好地拟合等温吸附实验结果。骨炭对Pb（Ⅱ）的吸附机制主要为表面络合反应与分解置换-沉淀反应。
    Abstract: Batch experiments were conducted to study the adsorption of lead on bone char. The effects of dosage of adsorbent, pH, ionic strength, contact time, temperature and initial concentration of lead were investigated. The lead removal is strongly dependent on pH and dosage of adsorbent. The temperature and ionic strength have a negligible effect on the adsorption capacity of bone char. The maximum removal rate of lead is about 100% at 20℃, with an initial concentration of 200 mg/L, pH=2.5 and a solid/liquid ratio of 1 g/L. The adsorption of Pb(Ⅱ) on bone char is a fast process and can reach equilibrium within 30 min. The kinetic data can be best described by the pseudo-second order model. Freundlich and Langmuir isotherm models are found to be applicable for the experimental data of lead adsorption by bone char. The adsorption mechanism mainly involves both surface complexation and dissolution of calcium hydroyapatite Ca10(PO4)6(OH)2 and is followed by less soluble precipitation Pb10(PO4)6(OH)2.
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出版历程
  • 收稿日期:  2013-05-14
  • 刊出日期:  2014-05-06
张金利, 刘大伟, 杨庆. 骨炭对Pb(Ⅱ)的吸附特性[J]. 环境工程学报, 2014, 8(5): 1784-1790.
引用本文: 张金利, 刘大伟, 杨庆. 骨炭对Pb(Ⅱ)的吸附特性[J]. 环境工程学报, 2014, 8(5): 1784-1790.
shu
Zhang Jinli, Liu Dawei, Yang Qing. Adsorption behaviors of bone char to heavy metal Pb(Ⅱ)[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1784-1790.
Citation: Zhang Jinli, Liu Dawei, Yang Qing. Adsorption behaviors of bone char to heavy metal Pb(Ⅱ)[J]. Chinese Journal of Environmental Engineering, 2014, 8(5): 1784-1790.
shu

骨炭对Pb(Ⅱ)的吸附特性

  • 1.  大连理工大学岩土工程研究所, 大连 116024
  • 收稿日期:  2013-05-14
基金项目:

国家自然科学基金资助项目（51179023）

摘要: 通过间歇实验研究了骨炭对重金属Pb（Ⅱ）的吸附特性。探讨了固液比、pH、离子强度、反应时间、温度及初始浓度等因素的影响。实验结果表明，pH与固液比显著影响去除率，温度与离子强度的影响较小。当温度为20℃，pH=2.5，Pb（Ⅱ）的初始浓度为200 mg/L，固液比为1 g/L时，最大去除率近100%。动力学实验结果表明，骨炭对Pb（Ⅱ）的吸附为快速反应，在30 min内可达到平衡，准二级动力学模型可较好地拟合实验结果。等温吸附实验结果表明，Freundlich模型与Langmuir模型均可较好地拟合等温吸附实验结果。骨炭对Pb（Ⅱ）的吸附机制主要为表面络合反应与分解置换-沉淀反应。

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