Effect of pH on Cu (II) removal from water using Adenanthera pavonina seeds as adsorbent
Bahnika Sen1, Sarma H.P1, Bhattacharyya K.G2
1-Department of Environmental Science, Gauhati University, Guwahati-781014, Assam, India
2-Department of Chemistry, Gauhati University, Guwahati-781014, Assam, India
The sorption of Cu(II) on the powdered seeds of Adenanthera pavonina is investigated as a function of pH over a range of initial Cu(II) concentrations. Maximum adsorption of Cu(II) from aqueous solution is obtained at pH 5. The data obtained is fitted to Langmuir and Freundlich isotherm models and Langmuir isotherm model is found to represent the adsorption data better. The FT-IR study show the role of hydroxyl, carboxyl, organosulfur and amino groups in the adsorption of Cu(II) on the surface of the biosorbent. The results are also supported by the data obtained from scanning electron micrographs and energy dispersive x-ray analysis.
Keywords: Copper (II), FT-IR, SEM, pH, biosorption, Adenanthera pavonina.
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