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螯合树脂对有机胺脱硫液中Fe2+的吸附平衡

魏凤玉,晏 冉,薛 攀,孙 倩   

  1. 合肥工业大学化学工程学院,安徽 合肥 230009
  • 出版日期:2013-04-05 发布日期:2013-04-05

Adsorption equilibrium of chelating resin for Fe2+ in organic amine desulfurization solution

WEI Fengyu,YAN Ran,XUE Pan,SUN Qian   

  1. School of Chemical Engineering,Hefei University of Technology,Hefei 230009,Anhui,China
  • Online:2013-04-05 Published:2013-04-05

摘要: 研究了4种螯合型树脂对有机胺脱硫液中Fe2+的吸附及解吸特性,发现D751型螯合树脂具有较高的吸附选择性和良好的脱附性能,采用静态吸附实验研究了D751型螯合树脂对Fe2+的吸附平衡,并用红外光谱的方法探讨了树脂吸附Fe2+的机理。结果表明,Langmuir模型和Freundlich模型均能较好地描述D751树脂对Fe2+的吸附行为;吸附自由能变?G 0,吸附为自发的熵增过程,升高温度有利于吸附的进行。红外光谱表明,D751树脂通过离子交换和配位双重作用与Fe2+结合。

关键词: Fe2+, 螯合树脂, 吸附平衡, 机理

Abstract: Four chelating resins were selected to compare their static adsorption and desorption on Fe2+ in the organic amine desulfurization liquid. D751 chelating resin showed high selectivity and good desorption property. Static sorption experiments were carried out to study the adsorption equilibrium of Fe2+ on D751 chelating resin at different temperatures,and the adsorption mechanism was discussed by using FI- IR. The experimental results showed that the adsorption behavior of Fe2+ on D751 resin could be well described by either Langmuir or Freundich isotherm and the negative value of ΔG and the positive value of ?S showed that the adsorption was a spontaneous process with increasing entropy,and the increase of temperature would benefit the adsorption process. Ion exchange and chelating adsorption were responsible for the removal of Fe2+ by FI-IR.

Key words: Fe2+ , chelating resin, adsorption equilibrium, mechanism

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