咖啡渣活性炭的制备及其去除含铜废水中Cu(Ⅱ)的性能研究

Preparation of Activated Carbon from Coffee Grounds and Its Performance in Removing Cu(Ⅱ)from Copper-containing Wastewater

研究了采用NaOH活化焙烧咖啡渣制备咖啡渣活性炭并用于吸附去除含铜废水中的Cu(Ⅱ)。通过SEM和EDS对咖啡渣活性炭进行表征,考察了废水初始pH、Cu(Ⅱ)初始质量浓度、吸附时间、吸附剂投加量对Cu(Ⅱ)去除率的影响。结果表明:针对质量浓度50 mg/L、pH=6的50 mL模拟含铜废水,在咖啡渣活性炭投加量10 mg、温度25℃,搅拌速率150 r/min条件下吸附9 h, Cu(Ⅱ)去除率可达94.12%;Langmuir等温吸附模型和准二级动力学模型能较好地描述吸附过程。该吸附材料对废水中Cu(Ⅱ)的吸附性能较好。

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.