改性木屑对铜离子的吸附性能

Adsorption of copper ion by modified sawdust

用热解+Na OH浸泡的方法制备改性木屑,通过表征手段观察了改性后木屑表面结构的变化,并研究了改性木屑对水溶液中Cu2+的吸附性能。结果表明:改性木屑表面变光滑,羟基增多;与原木屑和活性炭相比,改性木屑的平衡时间缩短了60 min,吸附速率提高了50%;改性木屑对铜离子的吸附符合Langmuir等温模型,最大吸附量为31.25 mg·g^(-1),是原始木屑吸附量的8倍,是活性炭的3倍。

Modified sawdust was prepared by pyrolysis and Na OH soaking processes,and the change in surface structure was evaluated through characterization. In addition,the adsorption of Cu2＋from aqueous solution by modified sawdust was studied. The results show that the surface of the modified sawdust was smoother and more hydroxyl groups can be observed. The adsorption equilibrium time of the modified sawdust for Cu2＋adsorption shortened by 60 min,and the adsorption rate increased by 50% compared with raw sawdust and activated carbon. The adsorption behavior of Cu2＋on modified sawdust fit well to the Langmuir models,and the maximum adsorption capacity could reach 31. 25 mg·g^-1,which was 8 times and 3 times higher than those of unmodified sawdust and activated carbon,respectively.