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在静态法研究了铝与钠蒙脱土交换反应的等温线及 pH 影响的基础上.用滴定量热法在303.15K 和 pH 为2、3和4条件下研究了此反应的焓变,并用 X-射线衍射技术研究了 Al~(3+)对蒙脱土的结构和性质的影响。结果表明,Al~(3+)与蒙脱土上 Na~+的交换为熵驱动过程.其能量的变化机理非常复杂。Al~(3+)交换后.可大大减小蒙脱土的吸水膨胀性,机理主要是Al~(3+)的高电荷密度产生强的引力而阻止了层间渗透膨胀作用,这对石油开采等许多应用领域具有指导意义。
Based on the static method, the isotherms and pH of the exchange reaction between aluminum and sodium montmorillonite were studied, and the enthalpy change of this reaction was investigated by titration calorimetry at 303.15K and pH of 2, 3 and 4 The effects of Al ~ (3+) on the structure and properties of montmorillonite were studied by X-ray diffraction. The results show that the exchanging of Na ~ + between Al ~ (3+) and montmorillonite is entropy-driven process, and its energy mechanism is very complicated. Al ~ (3 +) exchange can greatly reduce the water swelling of montmorillonite, the mechanism is mainly Al ~ (3 +) high charge density to produce a strong attraction and prevent the role of inter-layer infiltration and expansion of oil Mining and many other areas of application is instructive.