Caffeine adsorption from aqueous solutions onto polymeric sorbents

Maity, N.; Payne, Gregory F.; Ernest, Michael V.; Albright, Robert L.

doi:10.1016/0923-1137(92)90274-6

Cited by 32 publications

(11 citation statements)

References 26 publications

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“…3). Previous study indicates that enthalpic change thus determined agrees well with that obtained independently using microcalorimetric technique [24]. The free energy change can be obtained from Eqs.…”

Section: Thermodynamic Aspectssupporting

confidence: 83%

Enhanced removal of p-chloroaniline from aqueous solution by a carboxylated polymeric sorbent

Zheng

Pan

Zhang

et al. 2007

Journal of Hazardous Materials

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Section: Thermodynamic Aspectssupporting

confidence: 83%

Enhanced removal of p-chloroaniline from aqueous solution by a carboxylated polymeric sorbent

Zheng

Pan

Zhang

et al. 2007

Journal of Hazardous Materials

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“…One of these studies focused on the preferential adsorption of positional isomers of methoxyphenol . It has been suggested that the methoxyphenols interact with XAD-7 by forming intermolecular hydrogen bonds between their hydroxyl hydrogens and the carboxylic ester groups believed to be present on the sorbent surface 1 Partial structure of the acrylic ester sorbent XAD-7.…”

Section: Introductionmentioning

confidence: 99%

“…7 It has been suggested that the methoxyphenols interact with XAD-7 by forming intermolecular hydrogen bonds between their hydroxyl hydrogens and the carboxylic ester groups believed to be present on the sorbent surface. 8 The separation of methoxyphenol isomers is of interest for several reasons. The methoxyphenol moiety is common to many plant phenols, such as ferulic acid and isoeugenol, making it a simple test system for separating OACs.…”

Section: Introductionmentioning

confidence: 99%

Differential Adsorption of Phenol Derivatives onto a Polymeric Sorbent: A Combined Molecular Modeling and Experimental Study

et al. 1999

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Oxygenated aromatic compounds (OACs) are used for the synthesis of a variety of commercial products. Lignin from wood and other plant products are potential sources of OACs, but it is difficult to separate the mixtures of OACs found in digests of these raw materials. One promising separation approach involves the use of selective adsorption resins, such as the acrylic ester sorbent XAD-7. It has been shown previously that this sorbent binds the para isomer of one OAC, methoxyphenol, more favorably that the ortho isomer when hexane is used as the solvent. The present study uses a combination of molecular modeling and experiment to elucidate the mechanism of this selectivity. The calculations yield good agreement with experimental binding affinities and indicate that hydrogen bonding is the dominant mode of adsorption of para-methoxyphenol onto XAD-7 from hexane. In contrast, ortho-methoxyphenol appears to form an intramolecular hydrogen bond that weakens the intermolecular hydrogen bond to the sorbent. As a consequence, ortho-methoxyphenol binds less strongly, and its association is dominated by van der Waals interactions and three-centered hydrogen bonds. This result is supported by quantum mechanical calculations and infrared spectroscopic experiments. It is also found that when water is the solvent, hydrogen bonding becomes an insignificant adsorption mechanism, and both molecules bind to the resin via nonpolar interactions. This explains the loss of selectivity that is observed in both experiment and calculation.

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“…The sorbents used in this study were Rohm and Haas resins XAD-7 (acrylic ester) and XAD-16 (styrenic) with specific surface areas reported by the supplier (Sigma Chemical) to be approximately 450 and 800 m 2 /gm, respectively. All sorbents were washed extensively with methanol and water and dried prior to use.…”

Section: Methodsmentioning

confidence: 99%

Linear Solvation Energy Relationships To Explain Interactions Responsible for Solute Adsorption onto a Polar Polymeric Sorbent

1997

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Caffeine adsorption from aqueous solutions onto polymeric sorbents

Cited by 32 publications

References 26 publications

Enhanced removal of p-chloroaniline from aqueous solution by a carboxylated polymeric sorbent

Enhanced removal of p-chloroaniline from aqueous solution by a carboxylated polymeric sorbent

Differential Adsorption of Phenol Derivatives onto a Polymeric Sorbent: A Combined Molecular Modeling and Experimental Study

Linear Solvation Energy Relationships To Explain Interactions Responsible for Solute Adsorption onto a Polar Polymeric Sorbent

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