Ion exchange resins are a type of polymeric spherical particles with functional groups that achieve the separation, purification, and purification of ions in water or materials through ion exchange reactions. They are widely used in water treatment, pharmaceuticals, chemicals, food, and other industries, serving as efficient separation and purification materials.

These include strong acid (e.g., sulfonic acid resins) and weak acid (e.g., carboxylic acid resins) types, which effectively adsorb cations in water (such as calcium, magnesium, sodium, etc.). They are commonly used in water softening and desalination applications.
These encompass strong basic (e.g., quaternary ammonium resins) and weak basic (e.g., amine resins) types, capable of adsorbing anions (such as chloride ions, sulfate ions, etc.). They are often used in conjunction with cation resins for the preparation of high-purity water.
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