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Electroplating and metal working industries discharges effluent that contains toxic heavy metals such ascopper (Cu(II)), nickel (Ni(II)) and zinc (Zn(II)) ions. Biosorption has been recognized as ahigh efficiency and low-cost alternative method that can be used to treat the industrial effluent for heavy metal removal. In this study , mature leaves of neem (Azadirachta indica) was used as the potential biosorbent to study its adsorption behavior of Cu(II), Ni(II) and Zn(II) ions from aqueous medium solution in single and multicomponent system. The biosorption experiment was carried out in a batch process at constant room temperature and initial heavy metal concentration. Optimal biosorbent dosage, pH and contact time for the biosorption process of the three metals were investigated. At optimal pH of 6 and biosorbent dosage of 0.2g, the maximum metal uptake for Cu(II), Ni(II) and Zn(II) were 34mg/g, 26mg/g and 37mg/g respectively. For single metal solutions, biosorption equilibrium data for Cu(II) and Zn(II) fit the Freundlich model, while Ni(II) fitted the Langmuir isotherm. In the multicomponent system, the Langmuir isotherm fitted well for the equilibrium data of mixed solution of Cu(II), Ni(II) andZn(II).

BIOSORPTION OF COPPER (II), ZINC (II) AND NICKEL (II) FROM AQUEOUS MEDIUM USING AZADIRACHTA INDICA (NEEM) LEAF POWDER