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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (08): 769-774. 上一篇    下一篇

研究论文

介孔α-Fe2O3表面配合反应平衡常数测定

吴震生，张卫民，孙中溪*   

  1. (济南大学化学化工学院 济南 250022)
  • 投稿日期:2009-10-26 修回日期:2009-11-23 发布日期:2009-12-30
  • 通讯作者: 孙中溪 E-mail:sunzx@ujn.edu.cn
  • 基金资助:

    国家自然科学基金(No. 20677022)；国家自然科学重点基金(No. 20537020)

Surface Complexation Constants of Mesoporous Fe2O3

TUN Shen-Sheng, ZHANG Wei-Min, SUN Zhong-Xi   

  1. (School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022)
  • Received:2009-10-26 Revised:2009-11-23 Published:2009-12-30
  • Contact: Zhong-xi SUN E-mail:sunzx@ujn.edu.cn

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采用十二胺为模板剂、氨水做沉淀剂成功制备了介孔α-Fe2O3, 通过粉末X射线衍射(XRD)、透射电镜(TEM)、N2吸附/脱附技术对样品晶相、形貌和比表面积进行了表征. 根据介孔α-Fe2O3悬浮液的酸碱滴定数据, 使用FITEQL软件, 采用双电层恒电容模型计算得出了介孔α-Fe2O3的表面酸碱反应平衡常数. 在此基础上研究了Cu2＋, Pb2＋, Zn2＋在介孔氧化铁表面的吸附行为, 使用WinSGW软件模拟得出了相应的表面配合反应平衡常数并讨论了其吸附机理.

关键词: 介孔氧化铁, 重金属离子, 酸碱性质, 表面配合

Mesoporous Fe2O3 nanoparticles were synthesized using dodecyl amine as a template and ammonia as a precipitant. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and nitrogen adsorption-desorption analysis methods were used to characterize the crystallinity, morphology and the specific surface area. According to the experimental data of acid base titration of mesoporous α-Fe2O3 suspension, using FITEQL software and Constant Capacitance Model (CCM), the protonation and deprotonation constants of mesoporous α-Fe2O3 were determined. Base on the acid-base constants the adsorption of heavy metal ions (Cu2＋, Pb2＋, Zn2＋) at the surfaces of mesoporous Fe2O3 was studied as a function of pH. The surface complexation constants of Cu2＋, Pb2＋, Zn2＋at the surfaces were determined using WinSGW software and the reaction mechanism was discussed as well.

Key words: mesoporous iron oxides, heavy metal ions, acid-base property, surface complexation