The zeolites have enormous applications in the removal of various toxic materials like pesticide, ammonium ions and heavy metals from wastewater, protection of the environment from radioactive waste, emission control from gasoline used vehicle and so on. This short review focuses on the zeolites as molecular sieves and explains its effectiveness in agriculture, aquaculture industry, biomedical engineering, and petroleum refining process. A debate of types of natural and synthetic zeolites and their comparison has been also cited. The process involved for the synthesis of various zeolites from waste like fly ash, blast furnace slag, municipal solid waste ash, rice husk ash, paper sludge, lithium slag and from kaolin is described. Finally, the chemical compositions of the above-mentioned wastes are shown after reviewing various articles.

Keywords : Zeolites; Molecular Sieve; Waste; Environment.