Applications of Hydrogel/Zeolite Composites : A Review

The role of Hydrogel/Zeolite composites, synthesized for various applications, specifically dye removal from waste water, controlled fertilizer release and transdermal drug delivery system, has been discussed in this review. The importance of zeolites and the role of hydrogels in these applications, owing to specific chemical and structural properties, have also been compiled. Based on the extensive research work and literature available, it has been observed that hydrogels are preferred over other adsorbents, due to their exceptional water retention ability, while the zeolites function as carriers or absorbers of ions. These composites have been used for slow and prolonged chemical release, selective absorption and enhanced water retention capacity of hydrogels. A synergistic effect of the chemical and physical properties of hydrogels and zeolites are put to widespread use in the chemical and medical sectors, which have been discussed in detail. This work also presents an evaluation of various factors that influence the functioning and end properties of the Hydrogel/Zeolite composites.