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Removal of lead from aqueous solution by hydroxyapatite/manganese dioxide composite

机译：羟基磷灰石/二氧化锰复合材料去除水溶液中的铅

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摘要

A novel composite adsorbent, hydroxyapatite/ manganese dioxide (HAp/MnO_2), has been developed for the purpose of removing lead ions from aqueous solutions. The combination of HAp with MnO_2 is meant to increase its adsorption capacity. Various factors that may affect the adsorption efficiency, including solution pH, coexistent substances such as humic acid and competing cations (Ca~(2+), Mg~(2+)), initial solute concentration, and the duration of the reaction, have been investigated. Using this composite adsorbent, solution pH and coexistent calcium or magnesium cations were found to have no significant influence on the removal of lead ions under the experimental conditions. The adsorption equilibrium was described well by the Langmuir isotherm model, and the calculated maximum adsorption capacity was 769 mg·g~(-1). The sorption processes obeyed the pseudo-second-order kinetics model. The experimental results indicate that HAp/MnO_2 composite may be an effective adsorbent for the removal of lead ions from aqueous solutions.
机译：为了从水溶液中去除铅离子，已经开发了一种新型的复合吸附剂，羟基磷灰石/二氧化锰（HAp / MnO_2）。 HAp与MnO_2的结合意在提高其吸附能力。可能影响吸附效率的各种因素包括溶液的pH值，共存的物质如腐殖酸和竞争性阳离子（Ca〜（2 +），Mg〜（2+）），初始溶质浓度和反应持续时间。被调查。使用这种复合吸附剂，发现溶液的pH值和共存的钙或镁阳离子在实验条件下对铅离子的去除没有显着影响。 Langmuir等温线模型很好地描述了吸附平衡，计算的最大吸附容量为769 mg·g〜（-1）。吸附过程服从伪二级动力学模型。实验结果表明，HAp / MnO_2复合材料可能是从水溶液中去除铅离子的有效吸附剂。

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  • 来源
    《Frontiers of environmental science & eng》 |2016年第1期|28-36|共9页
  • 作者

    Lijing DONG; Zhiliang ZHU; Yanling QIU; Jianfu ZHAO;

  • 作者单位

    Key Laboratory of Yangtze River Water Environment, Ministry of Education, Shanghai 200092, China,Environmental Monitoring Centre of Changzhou, Changzhou 213000, China;

    Key Laboratory of Yangtze River Water Environment, Ministry of Education, Shanghai 200092, China;

    Key Laboratory of Yangtze River Water Environment, Ministry of Education, Shanghai 200092, China;

    State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    manganese dioxide; hydroxyapatite; lead; adsorption; composite materials;

    机译：二氧化锰羟基磷灰石铅;吸附复合材料;

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