Ion exchange(IX) is a process in which ions of a particular species in solution are replaced by ions with a similar charge but of different species attached to an insoluble resin. In essence, IX is a sorption process and can also be considered a reversible chemical reaction.
An organic IX consists of an organic or inorganic network structure with attached functional groups that can exchange their mobile ions for ions of similar charge from the surrounding medium. Each resin has a distinct number of mobile ion sites that set the maximum quantity of exchanges per unit of resin. IX resins are called cationic if they exchange positive ions and anionic if they exchange negative ions. Cation resins have acidic functional groups such as sulfonic, whereas anion resins are often classified by the nature of the functional group as strong acid, weak acid, strong base, and weak base. The strength of the acidic or basic character depends on the degree of ion-ization of the functional groups, similar to the situation with soluble acids or bases. Accordingly, a resin with sulfonic acid groups would act as a strong cation exchange resin.
Lanlang provides a large number of ion exchange wastewater treatment resins, including chelating resins, resins suitable for organic scavenging and resins for selected removal of specific contaminants, such as boron, phosphate, heavy metals, arsenic etc.
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