Unburnt carbon particles in the black smoke are an environmental hazard. There are various adsorbent materials such as activated carbon, MOFs, titano silicates, silica gels etc., which has the potential to absorb toxic gases. This review emphasizes on the synthesis and characterization of Zeolite, which is a hydrated aluminosilicate having a tetrahedral structural framework, it contains channels and cages which are occupied by exchangeable active metal ions and water molecules. Zeolites are synthesized through different synthesis methods, particularly, hydrothermal and green synthesis methods. The characterization results can be used to verify that Zeolite shows many unique properties such as uniform pore size, acidic properties, and thermal stability and so on. In recent years the preparation of different types of zeolite using waste materials like Kaolin, Coal Fly Ash and other raw materials as the primary source of aluminosilicate has shown great progress in the synthesis of Zeolite. Due to its pore size variation and higher adsorption properties zeolites can be widely used for the adsorption of obnoxious gases emitted from industries.

Keywords: Zeolites, Aluminosilicates, Micro pores, Adsorption, Toxic gases.