Adsorption properties of tea polyphenols onto three polymeric adsorbents with amide group

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:…”

“…20,21 In general, chemical modification of polymeric resins was used to obtain larger adsorption capacity and better selectivity for a specific organic pollutant by introducing some special functional groups. [22][23][24][25] The adsorption thermodynamic aspects, including adsorption isotherm, adsorption enthalpy, adsorption entropy, and adsorption Gibbs free energy as well, of the target pollutants can be of great significance to help elucidating the underlying mechanisms. For an adsorbent with surfaceenergy heterogeneity, both the adsorption selectivity and the absolute value of adsorption enthalpy can usually decrease with the increase of the adsorbate loading fractions.…”

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

“…Since the pioneering reports of the early 1960s [5], various methods for preparation of the macroporous polymeric adsorbents have been extensively pursued [6,7]. Their pore structure can be easily regulated by adjusting the crosslinking reagents and porogens; their surface chemistry can be easily modified by using co-monomers with desired functional groups in copolymerization or by a subsequent particular chemical reaction of the synthesized polymer [8][9][10]. Moreover, the macroporous polymeric adsorbents can be easily regenerated by some typical solvents such as ethanol, acetone, dilute sodium hydroxide aqueous solution, dilute hydrochloric acid aqueous solution or by a relatively mild warming-up procedure [11][12][13].…”

Understanding of phenolic compound retention mechanisms on PES-UF membrane

“…37 Consequently, the primary driving forces in the adsorption mechanism of the studied phenolic compounds on the PES-UF membrane may be a combination of multiple hydrogen bonding, hydrophobic interactions, and π -π stacking.…”