A new adsorption isotherm for heterogeneous adsorbent based on the isosteric heat as a function of loading

Chemical modification of Amberlite XAD-4 by carbonyl groups for phenol adsorption from wastewater

“…Do reports an isotherm model to account for the surface energy heterogeneity of an adsorbent as well as the adsorbate-adsorbate interaction on the adsorbent [39], it takes the DH as a function of the fractional loading of the adsorbate on the adsorbent (h) as the following equation:…”

Application of heterogeneous adsorbents in removal of dimethyl phthalate: Equilibrium and heat

“…With increasing adsorbate loading level, the adsorbent surface with high-energy sites has been occupied gradually, and the subsequent DMP molecules have to adsorb on the adsorbent surface at relatively low-energy sites, so that the absolute values of DH become less than the initial one. 23,28 Table 1S of Supporting Information also presents that at the same temperature and adsorbate loading level, compared to XAD-7, the larger losses of enthalpy and entropy (DH and DS) about DMP adsorption onto AC-750, NDA-101, and NDA-702 supports the proposed adsorption mechanism discussed in the previous section: DMP adsorption on AC-750, NDA-101, and NDA-702 is driven by hydrogen bonding, micropore filling, and p-p taking interactions together whereas the one on XAD-7 is due to the sole hydrogen bonding interaction.…”

“…23,28,40 It takes the isosteric adsorption enthalpy change as a function of the adsorbate fractional loading:…”

“…Although lots of studies on determination of the adsorption isotherm and adsorption enthalpy 26,27 were reported, there is little knowledge on the quantitative effects of the resin surface-energy heterogeneity and the adsorbate-adsorbate interaction on the adsorption properties. [28][29][30][31] In the present work, two types of chemically modified resins (NDA-101 with amino group and NDA-702 with hydroxyl group) were developed to mimic the multiple weak adsorbent-adsorbate interactions (hydrogen bonding, p-p stacking, and micropore filling together) on DMP adsorption. The commercial acrylic ester resin (Amberlite XAD-7) and coal-based granular activated carbon (AC-750) were selected for the comparative purpose.…”

Adsorption of organic solvent vapors on hydrophobic Y‐type zeolite

“…As noted by Do and Do (1997) where T is a specific temperature of interest and Eq. 9 can be represented as:…”