Kinetics and mechanism of the sorption of some aromatic amines onto amberlite IRA-904 anion-exchange resin
The kinetics of the sorption of aromatic amines such as o-aminophenol (o-AP), o-phenylenediamine (o-PDA), and p-phenylenediamine (p-PDA) onto Amberlite anion-exchange resin in chloride form was investigated in batch experiments spectrophotometrically at different temperatures. The sorption rate is zero order in all amines sorbed, increasing directly in the order: p-PDA < o-PDA < o-AP, which corresponds to the sequence of the electrostatic contributions to the sorption interactions. The attainments of sorption equilibrium of aromatic amines is seen to be similar. The diffusion coefficients (D) have been calculated by using Fick's equation from the second portions of the sorption/desorption curves; D values ranged from 0.7 to 2.8 x 10{sup {minus}9} cm{sup 2}/s. These results, reflecting the diffusion mechanism, were ascribed to intraparticle diffusion. Arrhenius parameters for the diffusion process and the thermodynamic quantities for the process of equilibrium sorption have been estimated. The effect of a chemical oxidation reaction on intraparticle diffusion was investigated by measuring the intraparticle diffusion of amines during the redox reaction.
- Research Organization:
- Tanta Univ. (EG)
- OSTI ID:
- 20014858
- Journal Information:
- Journal of Colloid and Interface Science, Vol. 221, Issue 1; Other Information: PBD: 1 Jan 2000; ISSN 0021-9797
- Country of Publication:
- United States
- Language:
- English
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