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- W2016180916 abstract "In order to explore the possibility of using cross-linked polymer of 4-vinyl pyridine as sorbent for removal, separation and recovery of phenolic species, the sorption behaviour of a number of model phenolic compounds, differing from each other in acidity and molecular size, has been studied, using the vinyl pyridine polymer both in the free-base form and in salt form. The phenolic compounds used include phenol, p-cresol, p-chlorophenol, p-nitrophenol, m-aminophenol, polyphenol and lignin. The sorption of phenolic compounds with the free-base resin affords significantly greater sorption capacity than that with the same resin used in the salt form. The level of pH of the aqueous medium has a marked influence on the sorption of phenols by free-base PVP, the maximum sorption taking place at lower pH for more acidic phenols, which is in accord with the hydrogen bonding mechanism of phenolics sorption. The Freundlich isotherm equation provides an adequate fit to the sorption data, while the coefficient of the isotherm equation bears a distinct relationship to the acidity of the phenolic sorbate. A simplified rate equation based on the concept of linear driving force fitted the initial sorption rate data well, yielding a value for the particle-diffusion control rate coefficient for each phenolic species. Substituted phenols have lower intraparticle diffusivities than phenol, with the diffusivity decreasing as the size of the substituent group increases. Lignin undergoes much stronger interaction with the resin than do the other phenols. Consequently, while the sorbed phenols are all easily eluted by dilute alkali, lignin sorbed onto the resin is however removed only with considerable difficulty." @default.
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- W2016180916 date "1983-10-01" @default.
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- W2016180916 title "Sorption of phenolics onto cross-linked poly(4-vinyl pyridine)" @default.
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- W2016180916 doi "https://doi.org/10.1016/0167-6989(83)90031-4" @default.
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