Adsorption of Lead ions from aqueous solution by the dead biomass of nanoalgae Scenedesmus sp.

In attempts to remove toxic metal lead, distinct types of algae biomass have been scrutinized as alternatives to conventional physicochemical technologies. In this research, the absorption of  Lead by nanoalgae Scenedesmus sp. was studied at concentration of10 to 100 mg/L, pH 3 to 8, temperature 15 to 40 °C and exposure time of 10 to 60 minutes)in a batch culture system. The concentration of Lead was determined by Atomic absorption spectrometry. Then, the absorption results were described using the Langmuir and Freundlich isotherms and the pseudo-first-order and Pseudo-second-order synthetics and thermodynamic equation of absorption. Optimal adsorption (a removal of 99.13 percent) was obtained at adsorbent amount of 0.05gr, concentration 40mg/L, pH = 4, temperature 30°C and equilibrium time of 20min. At reviews the correlation coefficient, adsorption kinetics follows the pseudo-second-order model and equilibrium is well described by Freundlich isotherm. According to the adsorption thermodynamics, the reaction found to be spontaneous, endothermic and accidentally. FTIR spectrum revealed that functional groups C-O, -OH and -NH played a major role in the adsorption.