A new adsorption–desorption model for water adsorption in activated carbon

Do, D.D.; Junpirom, Supunnee; Do, H.D.

doi:10.1016/j.carbon.2009.01.039

Cited by 132 publications

(107 citation statements)

References 25 publications

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“…In literatures, there are many reports about adsorption properties of activated carbon, which include the adsorptions of many compounds and metals, such as methyl tertiary-butyl ether, trichloroethene [5], resorcinol ,catechol [6], mercury [7,8], phenanthrene [9], p-nitrophenol [10], naphthalenesulphonic acids [11], aromatics [12], Hg-Ni-Cd metal ions [13] etc. However the report about de-sorption of activated carbon is less [14].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

Zhang¹,

Zhang²,

Huang³

2012

J Environment Analytic Toxicol

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Section: Introductionmentioning

confidence: 99%

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

Zhang¹,

Zhang²,

Huang³

2012

J Environment Analytic Toxicol

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“…Effect of fluorine doping on structure and CO 2 adsorption in silicon carbide-derived carbon 142 However, it can be seen that when the SiCDCs are fluorinated, the range of the pore size distribution gradually narrows from the virgin sample to the highly fluorinated SiCDC, and the fluorination of SiCDCs reduces the micropore volume. It is seen that the peak at ~4.9 Å in the virgin sample shifts toward larger values, as the fluorination level increases.…”

Section: Argon Adsorption At 87 Kmentioning

confidence: 99%

“…Several modifications to the DD isotherm model [154] have been presented in the literature to describe water adsorption on carbon [142,143,155,156]. Do et al [142] have extended the DD model to describe the adsorption and desorption branches of water adsorption in activated carbon.…”

Section: Water Adsorption In Carbon Materialsmentioning

confidence: 99%

“…The initial H 2 O molecules adsorbed on these centres act as nuclei for the growth of H 2 O clusters due to hydrogen bonding [142,143], and H 2 O which has a very strong electrostatic intermolecular interactions compared to weak carbon-water dispersive interactions [145] grow into hydrogen-bonded clusters at primary active sites that are present on the carbon surface (surface groups) followed by the growth and coalescence of these clusters, leading to the bulk filling of the carbon pores [141,146,147].…”

Section: Water Adsorption In Carbon Materialsmentioning

confidence: 99%

“…Do et al [142] have extended the DD model to describe the adsorption and desorption branches of water adsorption in activated carbon. Although this model can describe the different shapes of water adsorption isotherm in activated carbon, many physical parameters such as the size of water clusters and the equilibrium constant of water vapour in the micropores of activated carbon cannot be measured.…”

Section: Water Adsorption In Carbon Materialsmentioning

confidence: 99%

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Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

Abadi¹

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This thesis presents a fundamental investigation on the role of the structure of microporous silicon carbide-derived carbon (SiCDC) and its functionalisation in the adsorption equilibria and transport of gases. The SiCDCs with different particle size distributions were synthesized in our laboratory and characterized using a combination of techniques including scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), Xray diffraction (XRD), helium pycnometry, thermogravimetric analyses (TGA), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR), Raman spectroscopy, and gas adsorption.Based on the characterisation results, a bidisperse pore structure model is proposed for the synthesized SiCDC to explain the kinetics. In the mathematical modelling of adsorption kinetics, the internal structure of SiCDC is assumed to have ultra-microporous grains with larger particle scale micropores forming the intergrain pathways. It is shown that CH 4 adsorption kinetics is governed by two distinct diffusional resistances, arising from slow grain scale diffusion in ultra-micropores and faster particle scale diffusion in large micropores. For CO 2 , it is found that the adsorption kinetics is strongly influenced by a barrier resistance at the grain surface where entry into the ultra-microporosity occurs. The uptake of CO 2 in the bidisperse pore structure of CDCs occurs through rapid diffusion in the large particle-scale micropores, in which a Henry law isotherm holds, and a combination of barrier resistance at the grain surface and diffusional resistance in the grain interior with a Langmuirian isotherm. It is shown that the grain scale activation energies are comparable with values for carbon molecular sieves, and consistent with values expected for the size range of the ultra-micropores, while the activation energies for transport in the larger particle scale micropores are comparable to those for conventional activated carbons.The experimental uptake-based data are compared with self-diffusivities obtained through equilibrium molecular dynamics (EMD) simulations using a realistic model of SiCDC developed by the hybrid reverse Monte Carlo (HRMC) method. It is observed that MD-based CO 2 diffusivities are as much as two orders of magnitude larger than the CO 2 particle scale diffusion coefficients, however such discrepancy is not found for The findings of this thesis should aid better understanding of the gas adsorption and diffusion mechanism in microporous CDCs.iv

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Water Sorption Applications ofMOFs

2019

Introduction to Reticular Chemistry

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A new adsorption–desorption model for water adsorption in activated carbon

Cited by 132 publications

References 25 publications

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

Adsorption and De-Sorption of Polycyclic Aromatic Hydrocarbons on Activated Carbon

Adsorption analysis of carbon dioxide, hydrocarbons and moisture on carbon

Water Sorption Applications ofMOFs

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