摘要
以入侵植物加拿大一枝黄花为原料,在400℃氮气保护下,直接碳化90 min后,以KOH为活化剂,微波活化的方法制备了高比表面积微孔活性炭SCAC。结果显示活性炭SCAC的表面面积为1 888 m2/g,总孔容量为0.804 cm3/g,微孔容量为0.741 cm3/g,平均孔径0.567 nm,微孔平均孔径0.488 nm。通过静态吸附实验研究了活性炭添加量、溶液初始浓度、初始pH及吸附时间对SCAC吸附Cd(Ⅱ)的影响,通过动力学方程拟合探讨了活性炭对Cd(Ⅱ)的吸附机理。结果表明,吸附平衡时间、最佳pH及活性炭添加量分别为120 min、pH>7.5及0.05 g/50 mL,活性炭SCAC吸附动力学过程符合准二级方程模型。
High surface area and microporous activated carbon（SCAC） was prepared from the alien invasive plant Solidago canadensis,which was carbonized at 400℃ for 90 minutes under a nitrogen atmosphere,and then the carbonized product was activated by microwave radiation with agent KOH.The results showed that the surface area of SCAC was 1 888 m2/g,with total pore volume and micropore volume of 0.804 cm3/g and 0.741 cm3/g,respectively,average of pore size and micropore size were 0.567 nm and 0.488 nm.The adsorption effect of Cd（Ⅱ）with SCAC was conducted by the static adsorption experiments.Factors such as SCAC＇s dosage,initial concentration,initial pH and adsorption time were considered.And the adsorption mechanism was discussed through the fitting of the kinetic equation.It was concluded that the adsorption time,optimum pH and dosage of SCAC were 120 minutes,pH 7.5 and 0.05 g/50 mL,respectively.The adsorption kinetic was fitted with the pseudo-second-order kinetic model.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第5期1543-1547,共5页
Chinese Journal of Environmental Engineering
基金
上海市重点学科建设项目资助(B604)
上海市基础研究重点项目(09JC1400600)
关键词
加拿大一枝黄花
活性炭
镉吸附
吸附动力学
Solidago canadensis
activated carbon
cadmium adsorption
adsorption kinetics
