以木质素(Lignin)为基质,用戊二醛(GA)做交联剂,将聚乙烯亚胺(PEI)交联到木质素分子上,制得木质素-聚乙烯亚胺(Lignin-PEI)吸附剂,采用扫描电镜(SEM)、X 射线衍射(XRD)、傅立叶红外光谱(FT-IR)、X 射线光电子能谱(XPS)对 Lignin-PEI 的结构进行表征,并考察了其对 Cu2+的吸附性能。结果表明,当Lignin、PEI和 GA 的反应比m(g)∶V(mL)∶V(mL)为2∶5∶20,在温度25℃下,反应时间2 h,合成的Lignin-PEI的含氮量为10.61%。吸附等温数据符合Langmuir 模型,吸附动力学符合准二级反应动力学模型。Lignin-PEI 吸附剂对 Cu2+饱和吸附量为54.15 mg/g。
In this paper the sorbent of lignin-polyethyleneimine (lignin-PEI)was successfully synthesized by means of crosslinking lignin and polyethyleneimine (PEI)by glutaraldehyde.We characterized lignin-PEI by SEM,XRD,FT-IR and XPS,then investigated the use of lignin-PEI for the removal of Cu2+ from water. These results indicated that the nitrogen content of prepared lignin-PEI was 10.61wt% at lignin,PEI and GA reaction ratio m(g)∶V(mL)∶V(mL)of 2∶5∶20,at 25 ℃ for 2 h.We found sorption isotherms for lignin-PEI better fitted Langmuir equation.Sorption of Cu2+ ion on lignin-PEI followed pseudo second-order kinetics. The maximum sorption capacity was 54.15 mg/g for Cu2+ ion.
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