Ion-exchange resin

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Ion-exchange resin

Ion-exchange resin (pronunciation: /aɪ.ɒn ɪksˈtʃeɪndʒ ˈrɛzɪn/) is a type of polymer that is capable of exchanging particular ions within the polymer with ions in a solution that is passed over them. This ability is also known as ion-exchange capacity.

Etymology

The term "Ion-exchange resin" is derived from its function. The word "Ion" is from the Greek word ἰόν, meaning "going", a reference to the movement of ions across a membrane in solution. "Exchange" refers to the process of swapping one ion for another. "Resin" is a term for a group of polymers with a particular physical property, derived from the Latin resina.

Function

Ion-exchange resins are widely used in different separation, purification, and decontamination processes. The most common examples are water softening and water purification. In many cases, ion-exchange resins were introduced to replace the earlier method of zeolites, which are minerals that perform a similar function.

Types

There are multiple types of ion-exchange resins, most of which are produced from a similar polymer substrate. The type of ion-exchange resin is determined by the functional groups attached to the polymer substrate. The most common types are:

Related Terms

External links

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