An overview of removal of heavy metal ions from toxic aqueous solution using pani-based adsorbents

In present time, water pollution has become a quibbling issue in current environmental engineering and protection. The important aspect of nano composite is to develop economic and bio friendly route for the synthesis of nano samples. The various methods such as ion exchange, reverse osmosis, filtration, adsorption etc. for removing the metal ions from toxic water studied. Among these method adsorption technique widely used due to low cost. Basically, last years, conducting polymer based nano composites showed that application in different heavy metal ions especially Hg (II), Cd(II), Cr(VI), Pb(II), As(V) etc. Among the various conducting polymer PANI plays most important role for extracting the necessary heavy metal ions. The current review mainly focuses on synthesis, adsorption and mechanism of different PANI-based adsorbents like PANI/iron oxide, PANI/ZNO, PANI/GO, and PANI/CHITOSAN etc., which extract the heavy metal ions.