کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1610058 | 1516268 | 2015 | 5 صفحه PDF | دانلود رایگان |
• Organic-modified montmorillonite could adsorb aromatics from an aqueous solution.
• An adsorption can be expressed by Langmuir-type adsorption isotherms.
• The adsorption is spontaneous.
Montmorillonite (MMT) modified with tetraphenylphosphonium (TPP⋅MMT) and amyltriphenylphosphonium (AmylTPP⋅MMT) was shown to adsorb 1,2-dimethoxybenzene (DMB) and 1,3-dinitrobenzene (DNB) from an aqueous solution. The adsorption of DMB could be expressed by Langmuir-type adsorption isotherms. The adsorption of DMB by TPP⋅MMT and AmylTPP⋅MMT was spontaneous because the ΔG values in both cases were negative. The uptake of DMB by TPP⋅MMT and AmylTPP⋅MMT could be considered a physical adsorption process caused by π–π stacking interactions, because the ΔG values were in the range of −20 to 0 kJ mol−1. The uptake of DNB by TPP⋅MMT was expressed by the Halsey and Henderson models, which explained the multilayer adsorption.
Journal: Journal of Alloys and Compounds - Volume 625, 15 March 2015, Pages 8–12