Study on adsorption of Cu2+ and Pb2+ by acid modified seedy melon peel

Using acid to modify seedy melon peel,the adsorbent structure characteristics was analyzed by scanning electron microscope and infrared spectroscopy. The effect of concentration,adsorbent quality,time and acidity on the adsorption of Cu²⁺ and Pb²⁺ was studied. Experimental results showed that the static adsorption accorded with the Pseudo- second- order kinetic and Langmuir adsorption isotherm,adsorption mechanism was spontaneous chemical adsorption process.Maximum adsorption capacity of Cu²⁺ and Pb²⁺ was calculated,which was 14.72 mg / g and 41.69 mg / g.The optimum adsorption conditions was found that p H was 4,the ratio of material to liquid ratio was 2.5 g / L,the adsorption time was 200 min.In the application of flowing adsorption,acid modified seedy melon had faster adsorption speed in low concentrations,high adsorption and desorption rate,also it could be reused,cycle number was more than 10 times.