Effect of surface heterogeneity on physical adsorption

1973 ◽  
Vol 251 (7) ◽  
pp. 498-499
Author(s):  
B. Viswanathan ◽  
N. S. Viswanathan
Keyword(s):  
Physical Adsorption ◽  
Surface Heterogeneity ◽  
Effect Of Surface

BET Adsorption Isotherm and Surface Heterogeneity

1992 ◽  
Vol 57 (6) ◽  
pp. 1201-1209
Author(s):  
Lydia Ethel Cascarini de Torre ◽  
Eduardo Jorge Bottani
Keyword(s):  
Distribution Function ◽  
Adsorption Isotherm ◽  
Statistical Mechanics ◽  
Adsorption Isotherms ◽  
Surface Heterogeneity ◽  
Adsorption Energies ◽  
Multilayer Formation ◽  
Effect Of Surface

The BET adsorption isotherm is modified in order to take account of surface heterogeneity. The adsorption isotherm is obtained following the statistical mechanics formalism, proposed by Steele, and the effect of surface heterogeneity is limited to the first layer. A Gaussian adsorption energies distribution function is used to describe surface heterogeneity. The variations of the C parameter, multilayer formation and the inversion of adsorption isotherms are analysed.

Preparation of Multi-Walled Carbon Nanotubes (MWNTs)/Polymethyl Methacrylate (PMMA) Hybrid Membranes and their Sorption Performance of Benzene/Cyclohexane

2013 ◽  
Vol 740 ◽  
pp. 550-554
Author(s):  
Li Guang Wu ◽  
Yu Fei Chen ◽  
Yang Rong ◽  
Ting Wang ◽  
Yu Xing Wang
Keyword(s):  
Carbon Nanotubes ◽  
Polymethyl Methacrylate ◽  
Physical Adsorption ◽  
Separation Performance ◽  
Polar Group ◽  
Hybrid Membranes ◽  
Transmission Electron ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Effect Of Surface

Novel organic-inorganic hybrid membranes of polymethyl methacrylate (PMMA) containing multi-walled carbon nanotubes (MWNTs) were successfully prepared. Then, the swelling adsorption experiments of benzene/cyclohexane mixtures were employed to evaluate the performance of these membranes. Via transmission electron microscopy (TEM), Fourier transform infrared spectrophotometry (FTIR), the effect of surface modification on the morphology and properties of carbon nanotubes and hybrid membranes were studied. The results indicated that the separation performance for benzene/cyclohexane of the hybrid membranes depended on both the polarity of carbon nanotubes and the distribution of MWNTs in PMMA. Because the dispersion of MWNTs were obviously improved after acidification and ammonization modification, the hybrid membranes including modified MWNTs showed higher performance than membranes with un-modified MWNTs. In addition, a large number of polar group were introduced in the MWNTs during modification of acidification and ammonization, which depressed obviously the physical adsorption of cyclohexane by MWNTs. Therefore, these two changes in the properties of MWNTs both improved the separation performance of hybrid membranes.

Effect of surface heterogeneity on phosphorus adsorption onto mineral particles: experiments and modeling

2017 ◽  
Vol 17 (12) ◽  
pp. 2887-2898 ◽  
Author(s):  
Zhenghui Cui ◽  
Hongwei Fang ◽  
Lei Huang ◽  
Ke Ni ◽  
Danny Reible
Keyword(s):  
Surface Heterogeneity ◽  
Phosphorus Adsorption ◽  
Mineral Particles ◽  
Effect Of Surface
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