Study on Adsorption Behavior of the Bamboo-charcoal for Hg~(2+) and Pb~(2+) in the Mixed Solution

The adsorption behavior of the bamboo-charcoal for Hg2+ and Pb2+ in mixed solution were studied.Experimental results shows that mercury and lead could were adsorbed synchronously by bamboo-charcoal.The bamboo-charcoal showed high adsorption ability for mercury and lead at a wide pH range(pH 3.2～6.2),The optimal adsorption acidity is pH 5.90 in HAc-NaAc medium.The equilibrium time of adsorption is 270 min.In certain conditions,adsorption capacity increased,but adsorption ratio decreased with increases in concentration of adsorbed ion in mixed solution,and adsorption capacity decreased,but adsorption ratio increased with increases in mass of absorbent.If the absorbent amount is appropriate,Hg2+ and Pb2+ in mixed solution could were removed complete.The adsorption behavior of the bamboo-carbon for Hg2+ and Pb2+ in mixed solution obeys the Freundlich isotherm model respectively.