斜发沸石用于去除水中镍离子的研究：动力学与热力学
Use of clinoptilolite for the removal of nickel ions from water: kinetics and thermodynamics.
作者信息
Argun Mehmet Emin
机构信息
Department of Environmental Engineering, Engineering & Architecture Faculty, Selçuk University, 42003 Selçuklu-Konya, Turkey.
出版信息
J Hazard Mater. 2008 Feb 11;150(3):587-95. doi: 10.1016/j.jhazmat.2007.05.008. Epub 2007 May 10.
This paper describes the removal of Ni(II) ions from aqueous solutions using clinoptilolite. The effect of clinoptilolite level, contact time, and pH were determined. Different isotherms were also obtained using concentrations of Ni(II) ions ranging from 0.1 to 100 mg L(-1). The ion-exchange process follows second-order reaction kinetics and follows the Langmuir isotherm. The paper discusses thermodynamic parameters, including changes in Gibbs free energy, entropy, and enthalpy, for the ion-exchange of Ni(II) on clinoptilolite, and revealed that the ion-exchange process was spontaneous and exothermic under natural conditions. The maximum removal efficiency obtained was 93.6% at pH 7 and with a 45 min contact time (for 25 mg L(-1) initial concentration and a 15 g L(-1) solid-to-liquid ratio).
本文描述了使用斜发沸石从水溶液中去除镍（II）离子的过程。测定了斜发沸石用量、接触时间和pH值的影响。还使用浓度范围为0.1至100 mg L⁻¹的镍（II）离子获得了不同的等温线。离子交换过程遵循二级反应动力学并符合朗缪尔等温线。本文讨论了镍（II）在斜发沸石上进行离子交换的热力学参数，包括吉布斯自由能、熵和焓的变化，并表明在自然条件下离子交换过程是自发且放热的。在pH值为7、接触时间为45分钟（初始浓度为25 mg L⁻¹，固液比为15 g L⁻¹）时，获得的最大去除效率为93.6%。
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