摘要
实验测定了新型分子筛对钙离子的全交换容量及25℃、50℃、75℃下离子交换平衡数据.依据实验数据,绘制了Na+-Ca2+离子交换等温线以及Kielland图,计算出了该过程的焓变化,吉布斯自由能和熵变化.研究表明该新型分子筛Na+-Ca2+离子交换过程可用Langmuir吸附等温式很好的描述,且该过程为吸热反应,可自发进行,高温有利于钙离子的交换.
The cation exchange capacity of the Ca2＋ on the new type molecular sieve and the ion exchange equilibrium datum at 25 ℃,50 ℃,75 ℃ were measured respectively.The Na＋-Ca2＋ ion exchange isotherm and Kielland diagram were plotted according above data.Further,the enthalpy,Gibbs free energy and entropy were also calculated.The adsorption isotherms datum was fitted with Langmuir equation.These illustrates the ion exchange process is an endothermic and entropy increase reaction;ion exchange can occur automatically,but increasing temperature is advantageous to Ca2＋ exchange.
出处
《河北工业大学学报》
CAS
北大核心
2010年第6期72-75,共4页
Journal of Hebei University of Technology
