量热研究铝与钠蒙脱土交换反应  

Calorimetric Investigation for Exchange Reaction of Aluminum with Na-montmorillonite

作　　者：潘竟军[1] 杨冠英[1] 赵扬[1] 韩布兴[1] 闫海科[1] 

机构地区：[1]中国科学院化学研究所,北京100080

出　　处：《物理化学学报》1998年第6期569-572,共4页Acta Physico-Chimica Sinica

基　　金：国家攀登B计划

摘　　要：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 reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.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 reslllts show Al3+ adsorbed on the clay can dramatically reduce the expansion of montmorillonite because Al3+prevents osmotic swelling.

关 键 词：铝 蒙脱土 交换焓 量热法 交换反应 XRD 

分 类 号：O614.31[理学—无机化学]