SORPTION OF HEAVY METALS FROM AQUEOUS SOLUTION USING VIGNA RADIATA AND PISUM SATIVUM AS SUSTAINABLE ADSORBENTSM. SOMASUNDARAM, T. KANNADASAN, C. AHMED BASHA, M. THIRUMARIMURUGAN AND K.V. SELVAKUMARAbstract The removal of nickel and chromium from aqueous solution by adsorption on Pisum sativum and Vigna radiata was studied as a function of initial metal ion concentration, contact time, initial pH of the solution and adsorbent dosage. It was found that the optimum pH for nickel and chromium removal by the Pisum sativum and Vigna radiata was 4.0. At the optimal conditions, metal ion sorption increased as the initial metal concentration was increased. The batch experiment results showed that the maximum percentage removal was 99% and desorption efficiency in water was 85%. The metal adsorption data were fitted to kinetics as well as various isotherm models and the parameters were evaluated. It was found that the pseudo second order rate expression more suitable for this adsorption.
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