聚乙烯亚胺改性氧化石墨对水中铜离子的吸附性能研究

Adsorption Property of Polyethyleneimine Modified Graphite Oxide for Cu(Ⅱ) in Water

通过将聚乙烯亚胺(PEI)嫁接到氧化石墨(GO)表面,制备出聚乙烯亚胺改性氧化石墨(PEI-GO)复合物。通过FT-IR、TEM、XPS、TGA和拉曼光谱等对其进行表征,结果表明PEI成功嫁接到GO表面,同时研究了PEI-GO对水中Cu(Ⅱ)的吸脱附性能。PEI-GO对Cu(Ⅱ)的吸附动力学可以用准二级动力学方程描述,吸附等温线可用Langmuir方程模拟,吸附过程呈现单层吸附现象,PEI-GO在pH 5、5 mg/L Cu(Ⅱ)溶液中最大吸附容量可达205 mg/g。经过5次循环再生实验发现去除率仍保持58.3%,表明PEI-GO对水中Cu(Ⅱ)去除效果明显,是一种性能优异的吸附剂。

Polyethyleneimine(PEI)was grafted onto the surface of graphite oxide(GO)by oxidizing graphite,and polyethyleneimine modified graphite oxide(PEI-GO)composite was prepared.The structure and surface properties of the composites were characterized by FT-IR,TEM,XPS,TGA and Raman.PEI was successfully grafted on the surface of GO.Meanwhile,its adsorption and desorption capability for Cu(Ⅱ)was investigated.Its adsorption process complies with the Langmuir isothermal adsorption model and pseudo-second-order kinetic model.It also presents monolayer adsorption.The maximum adsorption capability of Cu(Ⅱ)is 205 mg/g in 5 mg/L Cu(Ⅱ)solution at pH 5.After five consecutive adsorption/desorption cycles,the removal rate still remains 58.3%.PEI-GO is a good adsorbent for moving Cu(Ⅱ)from water.