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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.

The contagion of toxic metals in water is a serious environmental and health concern and threatening problem worldwide. Particularly arsenic contamination in ground water has became great dilemma in the earlier decades. With advent in research for arsenic remediation, standard of drinking water is improving and now reduced to few parts per million (ppm) level of arsenic in drinking water sources. However, due to continuous enhancement in environmental pollution, remediation techniques are still needed to achieve the drinking water quality standard. Development of novel and economically feasible removal techniques or materials for selective separation of this toxic specie has been the main focus of research. Several arsenic removal techniques, including membrane separation, coagulation, precipitation, anion exchange have been developed. The aim of this article is to review briefly arsenic chemistry and previous and current available technologies that have been reported various low-cost adsorbents for arsenic removal.

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