Linear solvation energy relationship of the limiting partition coefficient of organic solutes between water and activated carbon

Article Abstract:

The first quantitative measure of the effect of the shape of the molecule on its tendency to be adsorbed on activated carbon is presented. A linear solvation energy relationship is used to estimate unknown values and to identify measurements for reevaluation. Such a relationship has been found for 353 values of the limiting adsorption coefficients of diverse chemicals: log K = 0.37+0.0341Vi - 1.07(beta) + D + 0.65P with R = 0.951, s = 0.51, n = 353 and F = 818.0, where Vi is the intrinsic molar volume, (beta) is a measure of the hydrogen bond acceptor strength of the solute, D is an index parameter for the research group and P is an index parameter for the flatness of the molecule.

Solvation, Solution (Chemistry), Solutions (Chemistry)

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Hydroxylamine hydrochloride-acetic acid-soluble and -insoluble fractions of pelagic sediment: readsorption revisited

Article Abstract:

The effects of sediment drying prior to leaching and the possibility of dissolved elements readsorption during the leaching experiment are discussed. Hydroxylamine hydrochloride-acetic acid and hydrochloride were used to leach rare earth elements (REE) from a pelagic sediment while Neutron activation analysis was used to measure the REE of the insoluble residues. Results preclude that the insoluble phases during the leaching procedure enabled significant readsorption of the REE.

Analysis, Usage, Leaching, Acids

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Sorption enhancement of some hydrophilic organic solutes through polymeric ligand exchange

Article Abstract:

Research was done at Lehigh University's Fritz Engineering Laboratory on ways to enhance the sorption properties of certain organic solutes through the use of a polymeric ligand exchanger (PLE). In addition, the research explored the regenerability of the PLE. The study found the PLE to be an effective sorption enhancement tool and established that the PLE could be regenerated with sodium chloride or sodium carbonate.

Sorbents

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