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- Title
Cation-exchange kinetic studies on poly- o-toluidine Ce(IV) phosphate: a nano-composite and electrical conducting material.
- Authors
Khan, Asif; Akhtar, Tabassum
- Abstract
An advanced cation-exchange nano-composite poly- o-toluidine Ce(IV) phosphate was synthesized by sol-gel technique by incorporating Ce(IV) phosphate precipitate with the matrix of poly- o-toluidine. The material showed good ion-exchange behavior and used successfully in separation of metal ions. The conductivity of the composite was found within the range of 10 to 10S/cm; measured by four-in-line probe DC electrical conductivity measuring technique. The conductivity is at the border of metallic and semiconductor region. Ion-exchange kinetics for few divalent metal ions was evaluated by particle diffusion-controlled ion-exchange phenomenon at four different temperatures. The particle diffusion mechanism is confirmed by the linear τ (dimensionless time parameter) versus t (time) plots. The exchange processes thus controlled by the diffusion within the exchanger particle for the systems studies herein. Some physical parameters like self-diffusion coefficient ( D), energy of activation ( E), and entropy of activation (∆ S°) have been evaluated under conditions favoring a particle diffusion-controlled mechanism.
- Subjects
TOLUIDINE; PHOSPHATES; CATIONS; NANOCOMPOSITE materials; ELECTRICAL conductors; METAL ions; ION exchange (Chemistry); DIFFUSION
- Publication
Journal of Materials Science, 2012, Vol 47, Issue 7, p3241
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-011-6162-8