Table 6 Comparison of five types of ion exchange resins59,190.
From: A critical review of point-of-use drinking water treatment in the United States
Type | Framework charge | Functional groups | Targeted pollutant ions | Suitable pH | Application |
|---|---|---|---|---|---|
SAC resin | Negative | –SO3H | Ca2+, Mg2+ | Whole range | Water softening, demineralization |
WAC resin | Negative | –COOH, –CHPO(OH) | Ca2+, Mg2+, H+ | 5–14 | Demineralization and de-alkalization |
SBA resin | Positive | –NR3+ | SO42−, NO3−, Cl−, HCO3−, total organic carbon (TOC) | Whole range | Demineralization, de-alkalization and desilication |
WBA resin | Positive | –NH2, –NHR, –NR2 | C6H8O73−, SO42−, C4H6O62−, PO43−, NO2−, Cl−, CH3COO−, | 1–9 | Organic acids and common anions |
MSC resin | Negative | Amino-carboxylic groups | Metal ions such as Co2+ and Pb2+ | Based on metal type | Removal of metal ions in dilute solution |
