Adsorption equilibrium of methane and carbon dioxide on microwave-activated carbon

Adsorption equilibrium of carbon dioxide on ammonia-modified activated carbon

“…However, a variation of the isosteric heats with the surface loading indicates the existence of different levels of surface energy and heterogeneity of the adsorbent surface (Ning et al, 2012). Figure 6 (Chue et al, 1995;Esteves et al, 2008;Garcés et al, 2013;Himeno et al, 2005;Van Der Vaart et al, 2000).…”

“…It is a measure of the interaction between the adsorbate molecules and the surface of the adsorbent, and it can be obtained from the temperature dependence of the adsorption isotherm (Esteves et al, 2008;Ning et al, 2012). The isosteric heat of adsorption, st Q , also denoted as H −∆ (kJ mol -1 ), at a specific adsorbate loading can be estimated using the Clausius-Clapeyron equation as follows (Park et al, 2002):…”

Understanding of mass transfer resistance for the adsorption of solute onto porous material from the modified mass transfer factor models

“…3a) onto GAC was verified. Considering the GAC originally made from coconut shell consists of high organics content [9] and has energetically heterogeneous surface [28] that the affinity of adsorbate-adsorbent shows more effective Al 3+ adsorption than NH þ 4 onto GAC from the water sample, because of the organic nature of surface chemical functions [29] as acceptor sites at GAC surface affects the attractive force. More acidic surface functions can attract more significant amount of Al 3+ from water due to the positive charged solute can be energetically favourable for adsorption and ion exchange processes [30].…”

Modification of Commercial Activated Carbons for CO2Adsorption

“…The CO 2 amount adsorbed at saturation conditions, as predicted by the Sips isotherm model for DTO, DTO/KOH, DTO/ZnCl 2 and DTO/K 2 CO 3 was 12.84, The Sips model assumes the surface of an adsorbent is heterogeneous [45] and a higher value of constant b in the Sips isotherm equation indicates a stronger adsorption affinity [46]. In addition, it can be seen that the order of the value of b for CO 2 on carbons is: DTO and DTO/K 2 CO 3 > DTO/ZnCl 2 > DTO/KOH.…”