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钛硅酸钠(Crystalline Sillicotitanate,CST)对铯(Cs)的吸附热力学分析是研究钛硅酸钠吸附铯机理的重要途径之一。本工作通过研究不同温度下CST与不同浓度CsNO3溶液反应,测定反应前后Cs+的浓度变化,得到了一系列参数。结果显示,不同的反应温度对应不同的饱和吸附量,当温度为298.15、313.15和328.15K时,饱和吸附量分别为212.8、217.4和232.6mg/g。分别用Langmuir方程和Freundlich方程对实验数据进行拟合,结果表明,此吸附过程更符合Langmuir等温吸附。在不考虑温度对吸附焓和吸附熵影响的前提下,计算得到吸附焓ΔH=21.28kJ/mol,ΔS=89.18J/K/mol以及ΔG<0。以上结果表明,CST对Cs的吸附过程是一个自发进行、既有物理吸附又有化学吸附的吸热反应。
Thermodynamic analysis of cesium (Cs) adsorption by Crystalline Sillicotitanate (CST) is one of the important ways to study the adsorption mechanism of cesium to titanosilicate. In this work, we studied the changes of Cs + concentrations before and after the reaction between CST and different concentrations of CsNO3 solution under different temperatures. A series of parameters were obtained. The results show that different reaction temperatures correspond to different saturated adsorption capacities, and the saturated adsorption capacities are 212.8, 217.4 and 232.6 mg / g at 298.15, 313.15 and 328.15 K, respectively. The experimental data were fitted by Langmuir equation and Freundlich equation respectively. The results show that the adsorption process is more consistent with Langmuir isothermal adsorption. Adsorption enthalpy ΔH = 21.28 kJ / mol, ΔS = 89.18 J / K / mol and ΔG <0 were calculated without considering the effect of temperature on the enthalpy of adsorption and entropy of adsorption. The above results show that the adsorption of Cs on Cs is a spontaneous, both physical and chemical adsorption endothermic reaction.