Interactions of metal ions with chitosan-based sorbents: a review

Selective removal of the heavy metal ions from waters and industrial wastewaters by ion-exchange method.

The Maxwell-Stefan approach to mass transfer

Adsorption isotherm models for basic dye adsorption by peat in single and binary component systems

Application of chitosan and its derivatives as adsorbents for dye removal from water and wastewater: a review.

Adsorption of acid dye on cross-linked chitosan fibers: Equilibria

The parallel transport of a protein by surface and pore diffusion within a highly porous ion exchanger is studied by measuring equilibria and uptake curves for adsorption of bovine serum albumin (BSA) on two different strongly basic chitosan ion exchangers (hard gels): Ch-2503 and Ch-2507 at pH 6.9 and 298 K. Experimenlal equilibrium isotherms are correlated by the Langmuir equation. Intraparticle effective diffusivities of BSA (D eff ) are determined from the homogeneous Fickian diffusion model, increasing with the bulk phase concentration increase of BSA (Co). It suggests the existence of parallel diffusion. The surface diffusivity D s for the parallel diffusion model is determined from the D eff , and D s =0.47X10 -13 m 2 /s (Ch-2507) and 2.4X10 -13 m 2 /s (Ch-2503) were obtained. Pore diffusivities based on the pore diffusion control (D' p ) are obtained by matching the shrinking core model with the experimental uptake curves. D' p decreases with increasing C 0 . Since D' p in Ch-2507 is constant when c 0 ≥1 kg/m 3 , the constant value 2.7X10 -11 m 2 /s is taken as the accurate pore diffusivity (D p ). As D' p in Ch-2503 does not approach a constant value, D p =1.0X10 -11 m 2 /s is determined by matching the parallel diffusion model with the uptake data, and the model calculated using experimental values of D s and D p agrees reasonably well with the uptake data for Ch-2507 and Ch-2503. This theoretical approach may be applied not only for intraparticle diffusion of proteions but any adsorbates in porous materials

Parallel transport of BSA by surface and pore diffusion in strongly basic chitosan

Applying the hydraulic radius model to laminar flow in a packed bed and assuming that mass transfer in the packed bed is analogous to that between a pipe surface and a stream of liquid with steady laminar velocity profile, liquid-phase mass transfer from the packed solid sphere was analyzed and an approximate solution is proposed. Further liquidfilm mass transfer coefficients were measured for benzoic acid-water system. From these results, together with previous data, it was found that the proposed equation agrees with data in Re'^10, both this equation and Carberrys equation can be applied for ]0<CRef <1OO, and Carberry's equation fits in Re'>100.

Mass transfer in laminar region between liquid and packing material surface in the packed bed

The characteristic coefficients of ions in Neosepta and Selemion cation exchange membranes were measured and compared with those of Nafion cation exchange membranes obtained previously. It was found that the exchange affinities of the cation exchange membranes used were represented as H + <Na + <K + <Cu 2+ <Cr 3+ <Ca 2+

Takeshi Kataoka

Papers

Adsorption of acid dye on cross-linked chitosan fibers: Equilibria

Parallel transport of BSA by surface and pore diffusion in strongly basic chitosan

Mass transfer in laminar region between liquid and packing material surface in the packed bed

Characteristic coefficients for equilibrium between solution and Neosepta or Selemion cation exchange membranes

Mass transfer characterization in forward and back extractions of lysozyme by AOT-isooctane reverse micelles across a flat liquid-liquid interface