物理化学学报 >> 1998, Vol. 14 >> Issue (06): 569-572.doi: 10.3866/PKU.WHXB19980617

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量热研究铝与钠蒙脱土交换反应

潘竟军, 杨冠英, 赵扬, 韩布兴, 闫海科   

  1. 中国科学院化学研究所，北京 100080
  • 收稿日期:1997-09-26 修回日期:1998-01-26 发布日期:1998-06-15
  • 通讯作者: 闫海科

Calorimetric Investigation for Exchange Reaction of Aluminum with Na-montmorillonite

Pan Jing-Jun, Yang Guan-Ying, Zhao Yang, Han Bu-Xing, Yan Hai-Ke   

  1. Institute of Chemistry,Chinese Academy of Science,Beijing 100080
  • Received:1997-09-26 Revised:1998-01-26 Published:1998-06-15
  • Contact: Yan Hai-Ke

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关键词: 铝, 蒙脱土, 交换焓, 滴定量热法, X-射线衍射

Abstract:

Exchange enthalpies of aluminum with Na-montmorillonite suspension are determined at 3O3.15K and PH=3, and 4, using titration calorimetry and the exchange reaction mechanism are further studied by combining calorimetric results and exchange isotherm determined by static method. The adsorption of aluminum on Na-montmorillonite is endothermic, and therefore exchange reaction is a process driven by entropy. X-ray diffraction patterns of montmorillonite saturated by Na+ and Al3+ are determined at wet and dry state respectively. The results show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.

Key words: Aluminum, Montmorillonite, Exchange enthalpy, Titration calorimetry, X-ray diffraction