【摘要】 利用静态吸附实验的方法,研究了负载纳米二氧化钛的凹凸棒石黏土对溶液中Ni(Ⅱ)的吸附热力学特性。结果表明,吸附等温线符合Freundlich吸附模型。根据热力学函数关系计算出吸附过程的ΔH为-26.56 k J/mol,ΔG为-5.12~-0.73 k J/mol,ΔS为-73.18 J/(mol·K),表明负载纳米二氧化钛的凹凸棒石黏土对溶液中Ni(Ⅱ)的吸附是自发、放热、熵减的过程,为物理吸附。更多还原

【Abstract】 Adsorption thermodynamics of Ni( Ⅱ) onto the attapulgite loaded nanometer TiO2 were investigated via static adsorption experiments. The results show that the adsorption data of Ni( Ⅱ) onto the attapulgite loaded nanometer TiO2 the Freundlich isothermal equation. The variations of adsorption enthalpy,the Gibbs free energy and the entropy could be calculated according to the thermodynamic function.The change of adsorption enthalpy is- 26. 56 k J/mol. The changes of adsorption Gibbs energy are in the range of- 5. 12 ~- 0. 73 k J/mol. The changes of adsorption entropy is- 73. 18 J /( mol·K). The adsorption of the attapulgite loaded nanometer TiO2 is spontaneous and endothermic,and the physical adsorption coexists. These facts all show that the adsorption is an entropy-increasing process.更多还原