摘要：

Zinc is a toxic metal and is present in high concentration in wastewater of various industries like galvanizing, metallurgical, electroplating, mining, paints, pigments, pulp and paper and pharmaceuticals. There are various conventional treatment techniques available for the removal of zinc from wastewater like chemical precipitation, ion exchange, reverse osmosis, electro dialysis, electrochemical treatment, membrane separation process and adsorption. Among these methods, adsorption has been found to be one of most popular process for the removal of zinc from wastewater due to its low initial cost and sludge free environment.Increasing demand for eco-friendly techniques promotes the interest to natural and bio-degradable adsorbents. In this work, lemon peel and banana peel have been used as biosorbents to achieve the desired objective. To study the adsorption of zinc ions, batch experiments were performed. The characterization of both adsorbents was carried out using FTIR. The effects of various process parameters like biosorbent concentration, contact time, pH, various initial zinc concentration and temperature on the removal of zinc from wastewater have been investigated and optimized. Adsorbent concentration for both biosorbents for the maximum removal of zinc at optimum pH of 4 and temperature of 300C is found to be 1g/100ml. The optimum contact time for the equilibrium condition is 260 min for the removal of zinc.

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