羊毛角蛋白/氧化石墨烯复合材料的制备及其吸附性能

Preparation and adsorption properties of wool keratin/graphene oxide composites

为了提高羊毛角蛋白(KE)对亚甲基蓝及重金属离子Pb^2+、Cu^2+的吸附性能,将羊毛角蛋白与氧化石墨烯(GO)进行复合,自组装形成水凝胶,冷冻干燥后制得KE与GO质量比为9∶1的复合材料。分别采用红外光谱、扫描电镜、X-射线衍射、热重分析等方法对复合材料的结构进行表征。得出,复合材料具有大量的极性含氧官能团,有利于吸附污染物分子;呈层状多孔(10μm)、片层褶皱的有序结构,提供了多的活性位点和大的比表面积;复合材料中GO片层均匀地分散在羊毛角蛋白基质中;加入GO对复合材料中KE的热稳定性影响较小。结果表明:与纯羊毛角蛋白相比,KE/GO复合材料吸附速率和吸附性能均大幅提高,对100 mg/L的亚甲基蓝去除率达96%,对100 mg/L重金属离子Pb2+和Cu2+的去除率分别为75%和74%。

In order to improve the adsorption performance of wool keratin(KE)on methylene blue and heavy metal ions Pb^2+ and Cu^2+,wool keratin was compounded with graphene oxide(GO),selfassembled to form a hydrogel,and lyophilized to obtain a KE∶GO(9∶1)composite material.The structures of the composites were characterized by infrared spectroscopy,scanning electron microscopy,X-ray diffraction and thermogravimetric analysis.The results show that the composites had a large number of polar oxygen-containing functional groups,which is beneficial to adsorb the pollutant molecules.It is a layered porous(10μm)structure at a lamellar order,which provides multiple active sites and large specific surface area,the GO sheet in the composite is uniformly dispersed in the wool keratin matrix,the addition of GO has little effect on the thermal stability of KE in the composite.The adsorption performance of KE/GO composites show that the adsorption rate and adsorption performance of the composites were significantly improved compared with pure wool keratin.The removal rate of methylene blue at 100 mg/L was 96%,the removal rates of heavy metal ions Pb2+and Cu2+at 100 mg/L were 75%and 74%,respectively.