Influence of surface chemical heterogeneities on adsorption/desorption hysteresis and coexistence diagram of metastable states within cylindrical pores

2006 ◽  
Vol 125 (7) ◽  
pp. 074707 ◽  
Author(s):  
Joël Puibasset
Keyword(s):  
Metastable States ◽  
Surface Chemical ◽  
Cylindrical Pores ◽  
Desorption Hysteresis ◽  
Adsorption Desorption

Behaviours of direct yellow 12 adsorption on mesoporous carbons with different pore geometries

2018 ◽  
Vol 2017 (1) ◽  
pp. 219-228
Author(s):  
Fengling Liu ◽  
Ziyan Guo ◽  
Hui Qiu ◽  
Xia Lu ◽  
Hua Fang ◽  
...  
Keyword(s):  
Mesoporous Carbons ◽  
X Ray Diffraction ◽  
Pore Characteristics ◽  
X Ray ◽  
Transmission Electron ◽  
Cylindrical Pores ◽  
Pseudo Second Order ◽  
Hexagonally Ordered ◽  
Adsorption Desorption ◽  
Interconnected Pore

Abstract Four kinds of mesoporous carbons, C1-h-w, C2-h-h, C3-s-w, and C4-s-h, with different pore geometries were prepared and characterised, and their adsorption behaviours with aqueous direct yellow 12 (DY-12) were investigated. The results of X-ray diffraction and transmission electron microscopy show that C1-h-w and C3-s-w have wormlike pore characteristics, whereas C2-h-h and C4-s-h have 2-D hexagonally arranged pores. According to the N2 adsorption/desorption results, the specific surface area of C1-h-w (1,378 m2/g) is the largest among the four carbons. The adsorption isotherms could be effectively fitted using the Langmuir model. The maximum adsorption amounts of C1-h-w, C2-h-h, C3-s-w and C4-s-h are 0.968 mmol/g, 0.726 mmol/g, 0.161 mmol/g and 0.156 mmol/g, respectively. The pseudo-second-order rate constants of C1-h-w (39.8 g/(mmol·min)) and C2-h-h (7.28 g/(mmol·min)) are substantially larger than those of C3-s-w (0.0046 g/(mmol·min)) and C4-s-h (0.014 g/(mmol·min)), indicating that an open and interconnected pore geometry is favourable for DY-12 adsorption. Furthermore, DY-12 diffusion in 2-D hexagonally ordered cylindrical pores is superior to that in wormlike pores due to the smoothness of the channels in the former. External mass transfer and intraparticle diffusion both play roles in the adsorption process.

A NMR investigation of adsorption/desorption hysteresis in porous silica gels

1998 ◽  
Vol 16 (5-6) ◽  
pp. 679-682 ◽  
Author(s):  
P Porion ◽  
A.M Faugère ◽  
P Levitz ◽  
H Van Damme ◽  
A Raoof ◽  
...  
Keyword(s):  
Porous Silica ◽  
Silica Gels ◽  
Desorption Hysteresis ◽  
Adsorption Desorption

Percolation Effects on Adsorption−Desorption Hysteresis

Langmuir ◽  
2000 ◽  
Vol 16 (17) ◽  
pp. 6999-7005 ◽  
Author(s):  
R. H. López ◽  
A. M. Vidales ◽  
G. Zgrablich
Keyword(s):  
Desorption Hysteresis ◽  
Adsorption Desorption

Application of Preisach model to adsorption–desorption hysteresis

2006 ◽  
Vol 372 (1-2) ◽  
pp. 219-221 ◽  
Author(s):  
Marek Frankowicz ◽  
Marcin Chrenowski
Keyword(s):  
Preisach Model ◽  
Desorption Hysteresis ◽  
Adsorption Desorption
Sign in / Sign up

Export Citation Format

Share Document