Preparation of Activated Carbon from Coffee Grounds and Its Performance in Removing Cu(Ⅱ)from Copper-containing Wastewater
The preparation of activated carbon from coffee grounds by activated roasting coffee grounds with NaOH and the adsorption and removal of Cu(Ⅱ)from wastewater containing copper were studied.The activated carbon of coffee grounds was characterized by SEM and EDS.The effects of initial pH of wastewater,initial mass concentration of Cu(Ⅱ),adsorption time and amounts of adsorbent on the adsorption of Cu(Ⅱ)were investigated.The results show that for the 50 mL simulated copper-containning wastewater with mass concentration of 50 mg/L and pH=6,under the optimal conditions of activated carbon from coffee grounds amounts of 10 mg,temperature of 25 ℃ and stirring speed of 150 r/min and adsorption time of 9 h,the Cu(Ⅱ)adsorption removal rate can reach 94.12％.Langmuir isothermal adsorption model and quasi-second-order kinetic model can describe the adsorption process well.The adsorption performance of Cu(Ⅱ)in wastewater is good.
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