微孔晶体K_(2)[Ge(B_(4)O_(9))]·2H_(2)O和K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]吸附性和化学热力学的研究

Kinetic Properties and Adsorbabilites of Microporous Crystals for Two Hydrated Borogermanates,K_(2)[Ge(B_(4)O_(9))]·2H_(2)O and K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]

利用水热法和高温固相法合成了两种硼锗酸盐微孔晶体:K_(2)[Ge(B_(4)O_(9))]·2H_(2)O和K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)],并使用X-ray粉末衍射、热分析、红外光谱和化学分析等手段对其结构进行了表征。使用微量热仪测定了它们在298.15 K下对常见有机溶剂的吸附焓。另外,还测定了K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]在不同温度下在1 mol·dm^(-3)HCl(aq)中的溶解焓和与LiNO_(3)的离子交换热,计算了出K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]溶解过程和离子交换过程中的热力学参数和热动力学参数。

Two borogermanate microporous crystalline material samples,K_(2)[Ge(B_(4)O_(9))]·2H_(2)O and K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)],were synthesized by hydrothermal and high temperature solid phase,respectively.They were characterized by XRD,FT-IR,TG-DTA and chemical analysis.Their adsorption enthalpy of common organic solvents at 298.15 K was measured using a microcalorimeter.In addition,the dissolution enthalpy of K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]in 1 mol·dm^(-3) HCl(aq)at different temperatures and the heat of ion exchange with LiNO_(3)were also determined.The thermodynamic parameters and thermokinetics parameters of K_(4)[B_(8)Ge_(2)O_(17)(OH)_(2)]in the process of dissolution and ion exchange were also calculated.