Kinetics in a chelate ion exchanger—II. Experimental

✍ Scribed by Hiroyuki Yoshida; Takeshi Kataoka; Seiichi Fujikawa

• Publisher: Elsevier Science
• Year: 1986
• Tongue: English
• Weight: 549 KB
• Volume: 41
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(86)80037-9

✦ Synopsis

Equilibrium and kinetic data on a chelate ion exchanger are presented and discussed in relation to the theory derived in Part I. Two typical ion exchangers, which show extremely high selectivity for Cuz + and Hg'+, are used. The experimental systems are R-Na/CuCI,, R-Na/CoC12 and R-Na/Cr(NOP)3. Reaction rate constants, intraparticle self-diffusivity of Na*, equilibrium constants and the concentration of electrolyte in the resin phase which is in equilibrium with the bulk solution concentration are presented. When the particle radius is larger than 10-"m, the theoretical model for diffusion control with chelate complex formation provides a good representation of the uptake curve of Cu2+. The uptake curves of Co'+ and Cr3+ for which the exchangers do not show such high selectivity, are correlated well by the usual > Nemst-Planck model for ion exchange, since for these ions the chelate complex is very much weaker.