Hi, I am looking for ion exchange materials which can behave as ion trapping agents for Na+, Cl-, etc. Is there such example of materials in the literature or in the market? Thanks.
Ion exchange materials are widely used to treat raw water supplies that contain dissolved salts. These materials have the unique ability to exchange one ion for another, hold it temporarily, and release it to a regenerant solution. The proper regenerant can replace undesirable ions taken from the water by the exchange material with a fresh supply of acceptable ions.
For example, a sodium zeolite softener replaces scale-forming calcium and magnesium ions in the water with sodium ions. One of the original processes for softening water used sodium aluminosilicate, commonly called zeolite. Today, efficient, high-capacity synthetic resins have replaced this natural material, but the term zeolite is still used to describe any cation exchange process.
Polystyrene divinyl benezene and carboxylic-based resins are the primary materials used in water treatment. The resins are further classified as having either a gelular, permeable membrane-type structure or a macroreticular (macroporous)-type structure. Macroreticular cationic resins have discrete pores that provide high resistance to thermal shock and oxidation. Macroreticular anionic resins resist organic fouling and are commonly used upstream of a gelular resin to protect it from raw water organics.
Water treatment resins are also classified as one of four basic process types: (1) strong cation (SC), (2) weak cation (WC), (3) strong-base anion (SB), and (4) weak-base anion (WB).
Strong-base anion exchange resins are also commonly referred to as type I and type II resins. Type I has greater chemical stability, while type II has a slightly greater regeneration efficiency and capacity.
Clay material like Bentonite, kaolinite, illite vermiculite, and zeolite materials such as analcite, chabazite, sodalite, and clinoptilolite have ion exchange properties.
Numerous manufacturers offer ion exchange resins, including DuPont, Purolite, and Mitsubishi. Google ion exchange and you'll find a ton of information. This website is particularly helpful: http://dardel.info/IX/AllResins.php?sort=6&filtre=1
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