Back to Search
Start Over
Electrical conductivity and cation exchange kinetic studies on poly-o-toluidine Th(IV) phosphate nano-composite cation exchange material
- Source :
-
Talanta . Oct2007, Vol. 73 Issue 5, p850-856. 7p. - Publication Year :
- 2007
-
Abstract
- Abstract: An advanced organic–inorganic cation exchange material poly-o-toluidine Th(IV) phosphate nano-composite was synthesized by a modified sol–gel technique by incorporating Th(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 10−2 to 10−3 S/cm; measured by 4-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 0), energy of activation (E a) and entropy of activation (ΔS 0) have been evaluated under conditions favoring a particle diffusion-controlled mechanism. [Copyright &y& Elsevier]
- Subjects :
- *ELECTRIC conductivity
*SEMICONDUCTOR doping
*TOLUIDINE
*PHOSPHATES
Subjects
Details
- Language :
- English
- ISSN :
- 00399140
- Volume :
- 73
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Talanta
- Publication Type :
- Academic Journal
- Accession number :
- 27152561
- Full Text :
- https://doi.org/10.1016/j.talanta.2007.05.003