Modeling Ion-Exchange Kinetics in Bimetallic Systems

Abstract

The kinetics of simultaneous loading of cobalt and copper onto an iminodiacetic-type resin is investigated here. This process is characterized by the appearance of a maximum of metal load for the cation with less affinity for the functional group. In our case cobalt load shows a maximum over time. When a semireacted bead is analyzed under the microscope, two different colored layers surrounding the central core are observed. The diffusional model proposed here takes into account the mobility of the cations through the two phases of the macroporous ion exchanger. The numerical solution of the system of differential equations yields solid-phase concentration profiles and metal load over time. Model parameters are adjusted to fit the estimated metal load from reacted layer motion.

Simulation of Internal Concentration Profiles in a Multimetallic Ion Exchange Process

“…Metals are loaded from a bimetallic equimolar solution of cobalt and copper sulfate. In this system cobalt, which is the metal with least affinity for the functional group, can reach concentrations for intermediate reaction times in the solid phase as high as 15 times the final equilibrium value . It is demonstrated here that this behavior is in accordance with measured concentration profiles and can be predicted from basic considerations.…”

Intermatrix Synthesis as a rapid, inexpensive and reproducible methodology for the in situ functionalization of nanostructured surfaces with quantum dots

“…This is because of the coupling of the IMS with DEE and the abovementioned difficulty of the precipitation agent to penetrate the polymeric matrix as result of electrostatic equilibrium. In this case, IMS is coupled with DEE [15,64,65] predicts that the use of negatively charged precipitation agents as S 2-leads to the precipitation and location of the CdS -QDs mainly on the surface of the supporting matrix.…”

Design of High Efficiency Chelate Fibers with an Amine Group To Remove Heavy Metal Ions and pH-Related FT-IR Analysis

“…There are lots of methods to reduce the heavy metal content of effluence including chemical precipitation, electrolytic methods, adsorption onto activated carbon, − membrane process, and ion exchange (chelator) resin , and fiber . Since Tomson and Way were the first to establish the mechanism of the ion-exchange reaction in the 1990s, a number of advances in the area of the ion-exchange system have progressed. − Generally, resins have been widely applied to wastewater treatment systems as the conventional type of the ion-exchange materials, which have several problems such as low adsorption ability, durability, low recycling ratio, and high cost of maintenance, respectively. And resins also have more fabricating steps and byproducts caused by manufacturing when compared with chelate fiber .…”