Water vapour adsorption on activated carbons: comparison and modelling of the isotherms in static and dynamic flow conditions

2002 ◽  
Vol 77-78 ◽  
pp. 409-414 ◽  
Author(s):  
C Vagner ◽  
G Finqueneisel ◽  
T Zimny ◽  
J.V Weber
Keyword(s):  
Water Vapour ◽  
Activated Carbons ◽  
Flow Conditions ◽  
Dynamic Flow ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption

Water vapour adsorption on lignin-based activated carbons

2007 ◽  
Vol 82 (6) ◽  
pp. 548-557 ◽  
Author(s):  
Jorge Bedia ◽  
José Rodríguez-Mirasol ◽  
Tomás Cordero
Keyword(s):  
Water Vapour ◽  
Activated Carbons ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption

scholarly journals Factors Influencing the Kinetics of Water Vapour Adsorption on Activated Carbons

2021 ◽  
Vol 23 (3) ◽  
pp. 191
Author(s):  
Y. Boutillara ◽  
L. Richelet ◽  
L.F. Velasco ◽  
P. Lodewyckx
Keyword(s):  
Water Vapour ◽  
Activated Carbons ◽  
Kinetic Constant ◽  
Ambient Conditions ◽  
Experimental Conditions ◽  
Adsorption Mechanisms ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption ◽  
The Impact ◽  
Kinetics Of

The performance of porous carbon materials as sorbents is often compromised by the presence of humidity. Studying the kinetics of water vapour adsorption on activated carbons will undeniably help to overcome this issue. This has been approached in this work by evaluating the influence of several operational factors on the dynamic adsorption of water vapour in these materials. Specifically, different carbon types, particle sizes, air flows and ambient conditions (temperature and relative humidity (RH)) were systematically investigated. The impact of each isolated parameter on both the maximum water uptake and the uptake rate was analyzed by fitting the experimental data to the Linear Driving Force (LDF) kinetic model. The results show that except for the particle size, the studied variables play a role in the water sorption kinetics, although to a different extent. It was also confirmed that the LDF model can adequately describe the kinetics of water vapour adsorption independently of the experimental conditions. Finally, the complete water vapour adsorption process can be described by this model, obtaining a different value of the kinetic constant for the sequential stages, involving different adsorption mechanisms.

scholarly journals The features of water vapour adsorption on micro- and mesoporous activated carbons

2019 ◽  
Vol 10 (1) ◽  
pp. 22-37
Author(s):  
N. V. Guzenko ◽  
◽  
P. Lodewyckx ◽  
K. László ◽  
M. Thommes ◽  
...  
Keyword(s):  
Water Vapour ◽  
Activated Carbons ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption

scholarly journals Changes in the size of the apparent surface area and adsorption energy of the rye roots by low pH and the presence of aluminium ions induced

2016 ◽  
Vol 30 (3) ◽  
pp. 375-381 ◽  
Author(s):  
Alicja Szatanik-Kloc
Keyword(s):  
Surface Area ◽  
Water Vapour ◽  
Adsorption Energy ◽  
High Energy ◽  
Root Surface ◽  
Low Ph ◽  
Vapour Adsorption ◽  
Average Water ◽  
Water Vapour Adsorption ◽  
Adsorption Desorption

Abstract The plant reactions on Al-stress include i.a. change of the surface area of the roots, which in the physicochemistry of plants characterizes the transport of water and ions through the root. The object of this study is the specific surface area of the roots of plants which are tolerant to aluminium, such as rye. Plants of rye were grown in a nutrient solution for 14 days at pH 4.5 in the presence of Al3+ ions of concentration 10, 20, and 40 mg dm−3. The control plants were grown continuously at pH 7 or pH 4.5 without Al3+. The apparent surface area and adsorption energy of the plants roots were determined from water vapour adsorption – desorption data. The apparent surface area of roots growing in the aluminium was (with respect to control) statistically significantly lower. There were no statistically significant differences in the apparent surface area of the roots which grew in pH 7, pH 4.5 without Al3+. The average water vapour adsorption energy of the root surface, under stress conditions decreased. In the roots grown in the presence of Al+3, there was a slight decrease in high energy adsorption centres and an increase in the amount of low-energy centres.

Synthetic allophane from highconcentration solutions: nanoengineering of the porous solid

Clay Minerals ◽  
2002 ◽  
Vol 37 (3) ◽  
pp. 451-456 ◽  
Author(s):  
F. Ohashi ◽  
S.-I . Wada ◽  
M. Suzuki ◽  
M. Maeda ◽  
S. Tomura
Keyword(s):  
Water Vapour ◽  
Particle Diameter ◽  
Amorphous Structure ◽  
Water Vapour Pressure ◽  
Transmission Electron ◽  
Bet Specific Surface Area ◽  
Relative Water ◽  
Vapour Adsorption ◽  
Water Vapour Adsorption ◽  
Adsorption Desorption

AbstractThe amorphous aluminosilicate allophane was synthesized by rapid mixing of inorganic solutions with high initial concentrations (10 – 100 mmol/l) followed by hydrothermal treatment. X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed homogeneous products having a hollow spherical amorphous structure with a particle diameter of 3 – 5 nm. The amorphous products had a high BET specific surface area (490 – 552 m2/g) in comparison with natural allophane and had a narrow pore-size distribution (2 – 5 nm in diameter). The results of water vapour adsorption isotherm studies showed a gradual increase over the range of relative water vapour pressure of 0.6 – 0.9 and reached a maximum of ∼85 wt.%. The synthetic allophane shows promise as an adsorbent material because of its high adsorption-desorption capacity and its unique structure.

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