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›› 2008, Vol. 8 ›› Issue (6): 1213-1217.

• 材料工程专栏 • 上一篇    下一篇

磁性天然沸石的制备及其对Pb2+和Cu2+的吸附性能

袁明亮 闫冠杰   

  1. 中南大学矿物工程系 中南大学资源加工与生物工程学院无机材料系
  • 收稿日期:2008-07-18 修回日期:2008-08-25 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 袁明亮

Preparation of Magnetically Modified Natural Zeolite and Its Adsorption to Pb2+ and Cu2+

  

  1. Col. Res. Proc. & Bioeng., South China Univ.,
  • Received:2008-07-18 Revised:2008-08-25 Online:2008-12-20 Published:2008-12-20

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被引次数

20

摘要： 采用化学共沉淀法将具有吸附特性的天然沸石与磁性氧化铁颗粒结合，制备了具有吸附特性的磁性沸石复合体. 利用XRD、氮吸附等温线、FT-IR光谱、SEM和振动样品磁强计等手段对制备的磁性沸石进行了表征. 结果表明，与钠型沸石相比，磁性沸石的结构没有发生明显变化而比表面积由25.13 m2/g增大到100.90 m2/g. 对模拟废水中Pb2+和Cu2+的吸附研究可知，磁性沸石对Pb2+和Cu2+的吸附依赖于pH值的变化，且在pH>4.5时去除效率均大于90%；同时，在不同初始浓度的废水溶液中，磁性沸石对Pb2+和Cu2+的最大吸附量分别为19.44和6.20 mg/g.

关键词: 磁性天然沸石, 吸附, 磁性分离, Pb2+和Cu2+

Abstract: The adsorption features of natural zeolites with the magnetic properties of iron oxides were combined in a composite by chemical coprecipitation process to prepare a magnetic adsorbent. The magnetically modified zeolite (MMZ) was characterized by XRD, nitrogen adsorption isotherms, FT-IR spectroscopy, SEM and magnetization measurement. The results showed that the structure of MMZ was not manifestly changed, compared with Na-zeolite, and its specific surface area increased from 25.13 to 100.90 m2/g. The adsorption of Pb2+ and Cu2+ in simulated wastewater on MMZ was studied. The results showed that the adsorption of metal ions was dependent on pH, and at pH>4.5, the removal efficiencies of Pb2+ and Cu2+ were more than 90%. Moreover, the maximum loading capacities of Pb2+ and Cu2+ in the initial concentration range studied reached 19.44 and 6.20 mg/g, respectively.

Key words: Magnetically modified zeolites (MMZ), Adsorption, Magnetic separation, Pb2+ and Cu2+

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