Kraft Wastewater Cleaning with Polymeric Adsorbents

Vian, A.; Castro, Edilene Alcântara de; Rodríguez, Julio

doi:10.1080/01496398508060694

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The adsorption resins have been widely used in the separation and purification of mixtures in chemical, food, pharmaceutical, and environment industries 1–3. Up to present, almost all of the adsorption applications were carried out in aqueous medium, and the adsorption was mainly driven by the hydrophobic interaction 4.…”

Section: Introductionmentioning

confidence: 99%

Adsorption from aqueous solution based on the synergism between hydrogen bonding and hydrophobic interactions

Yao

2005

J of Applied Polymer Sci

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ABSTRACT:The adsorption of aniline, N-methyl aniline, and N,N-dimethyl aniline on carboxyl resin(D152) in different media, water, ethanol, and hexane have been studied. In water the adsorption affinity of three sorbates on D152 increased with an increasing number of methyl groups on N atoms, which indicated that the adsorption of the three sorbates on D152 was driven by a hydrophobic interaction. But the adsorption enthalpy of the three sorbates exceeded the van der Waals force and was in the range of hydrogen bonding interactions, which indicated that the hydrogen bonding also played an important role. In hexane the adsorption affinity decreased with the increasing number of methyl groups on the N atom, presenting the reverse order to that in water. This fact revealed that the hydrogen bonding played a predominant role for the adsorption in hexane.In ethanol, there was no adsorption of three sorbates on D152 resin, because both the van der Waals force and the hydrogen bonding interaction between the resin and sorbate were depressed. The hydrogen bonding between resin and sorbates in water was also depressed, but the hydrogen bonding adsorption remained. This result suggested that there might be a synergetic effect between the van der Waals and hydrogen bonding interactions in the adsorption of sorbate on D152 resin in water. The synergetic effect was explained thermodynamically.

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Section: Introductionmentioning

confidence: 99%

Adsorption from aqueous solution based on the synergism between hydrogen bonding and hydrophobic interactions

Yao

2005

J of Applied Polymer Sci

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Selective adsorption of plant products

Payne

Shuler

1988

Biotech & Bioengineering

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The results from this study demonstrate that neutral resins can selectively concentrate specific indole alkaloids from dilute aqueous mixtures. Adsorption was observed to provide a one to two order of magnitude improvement in concentrating these alkaloids, as compared to an equivalent single-staged extraction. Since the sorption correlates with the concentration of the neutral form of the dissolved alkaloid, the adsorption is dependent on both the pH of the medium and the pKa of the alkaloids. Also, adsorption is dependent on specific sorbent-sorbate characteristics. In this study, by exploiting differences in the acid-base properties and the sorption characteristics of specific indole alkaloids, separation factors of 20-30 were observed. Although this behavior is valuable for analytical separations, the present study considers the application to the primary recovery of alkaloids from plant cell processes. Throughout this study it was also observed that the polycarboxylic ester resin (XAD-7) behaved quite differently from the styrene divinylbenzene resin (XAD-4). Despite a lower capacity, the XAD-7 resin was considerably more selective in adsorbing indole alkaloids than the XAD-4 resin. These alkaloids could also be desorbed from the XAD-7 resin by acidifying the liquid, while organic solvents were required to desorb these compounds from the XAD-4 resin.

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Purification of fresh cassava root polyphenols by solid-phase extraction with Amberlite XAD-8 resin

Lalaguna

1993

Journal of Chromatography A

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Kraft Wastewater Cleaning with Polymeric Adsorbents

Cited by 4 publications

References 3 publications

Adsorption from aqueous solution based on the synergism between hydrogen bonding and hydrophobic interactions

Adsorption from aqueous solution based on the synergism between hydrogen bonding and hydrophobic interactions

Selective adsorption of plant products

Purification of fresh cassava root polyphenols by solid-phase extraction with Amberlite XAD-8 resin

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