Ion exchange resins are composed of polymers with charged sites where ion exchange can occur. Synthetic ion exchange resins are usually prepared from porous microspheres whose surface and pore size are ideal for the attachment of ions. If the surface area is too large, severe phy

ion exchange resin is composed of polymers with charged sites where ion exchange can occur. Synthetic ion exchange resins are usually prepared from porous microspheres whose surface and pore size are ideal for the attachment of ions. If the surface area is too large, severe physical adsorption can occur. Once the ion exchange resin is wrapped by physical adsorption with various substances, it cannot perform ion exchange . (Too small surface area results in limited ion exchange capacity). Under normal conditions, both ion exchange and physical adsorption occur. For more information, please visit Merck Life Sciences official website: www.sigmaaldrich.cn

Ion exchange resin is composed of polymers with charged sites, where ion exchange can occur. Synthetic ion exchange resins are usually prepared from porous microspheres whose surface and pore size are ideal for the attachment of ions. If the surface area is too large, severe physical adsorption can occur. Once the ion exchange resin is wrapped by physical adsorption with various substances, ion exchange cannot be performed. (Too small surface area results in limited ion exchange capacity). Under normal conditions, both ion exchange and physical adsorption occur.

Anion exchange is a selective resin that removes anions (negatively charged ions). Strong anion exchange uses quaternary amine groups as functional groups, while weak anion exchange uses tertiary amine groups. cation exchange resin removes cations (positively charged ions). The strong cation exchange group is the sulfonic acid group, while the weak cation exchange group is carboxylic acid . How does

ion exchange resin work?

R-H+ + Na+ = R- Na+ + H+

As shown above, there is an equilibrium between Na+ bound to the resin and Na+ in the solution. The greater the concentration of H+ on the resin, the more Na+ is bound to it. It is impossible for the resin to bind ions 100%, and the balance of binding depends on the pH value of the water and the degree of resin regeneration.