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An adsorbent consisting of Hg 2+ ion imprinted polymer (IIP) was prepared and used for removal of Hg 2+ from real water samples. IIP was synthesized by utilizing 1vinylimmidazole and methacrylic acid as complexing agent and monomer. IIP was characterized by FT-IR, SEM and EDX to investigate the functionality, morphology and elemental analysis. Adsorption isotherms and kinetics of Hg 2+ ion on Hg 2+ imprinted polymer have been studied and adsorption phenomenon of IIP was found to follow the Langmuir isotherm and pseudo second order kinetic model. Other parameters such as pH, temperature, shaking speed, and agitation time affecting the adsorption of Hg 2+ were also optimized. The relative selectivity coefficient of imprinted polymer for Hg 2+ / Cu 2+ , Hg 2+ / Cr 3+ , Hg 2+ /Co 2+ were 122, 103, 76, respectively.

Heavy metals contamination in environment is a global problem. Environment is polluted by different toxic metals due to industrial sources and anthropogenic activities. Variety of methodologies has been applied for the purification of waste water. Thus, article mainly focuses on the current developments and applicability of various wastewater treatment techniques, i.e., adsorption, membrane filtration, ion exchange, electrochemical treatment and electrocoagulation. Also, development of new adsorbents especially selective adsorbent, i.e., ion imprinted polymeric materials for selective removal and pre-concentration of toxic Nickel (II) and Chromium (VI) ions has been discussed in detail.

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