聚乙烯亚胺氨基化磁性氧化石墨烯的制备及其对活性艳红X-3B的吸附

使用改性hummers法制备出氧化石墨烯(GO),通过水热法在GO上生长磁性CoFe₂O₄,再使用聚乙烯亚胺(PEI)进行氨基改性,制备出聚乙烯亚胺氨基化磁性氧化石墨烯(PEI-MGO)。使用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对PEI-MGO的结构和微观形貌进行表征。结果表明:纳米级尖晶石相CoFe₂O₄均匀分散于GO上,且氨基改性成功。探讨了PEI-MGO对水体中活性艳红X-3B的吸附性能。结果表明:在活性艳红X-3B初始质量浓度为150mg/L、体积为100mL、吸附剂质量为0.04g、pH值为1、吸附时间为60min时达到平衡,平衡吸附量为361.15mg/g。PEI-MGO对活性艳红X-3B的饱和吸附量为470.58mg/g。磁分离和磁回收研究表明,PEI-MGO能快速从水体中分离,回收率为98.6%。

Preparation of polyethyleneimine amino-functionalized magnetic graphene oxide and its adsorption to reactive brilliant red X-3B

The graphene oxide (GO) was prepared by the modified hummers method. Then the magnetic CoFe₂O₄ was grown on GO by hydro-thermal method. Polyethyleneimine (PEI) was used for amino-modification to prepare PEI amino-functionalized magnetic graphene oxide (PEI-MGO). The structure and microscopic morphology were characterized by X-ray diffractometer (XRD) and scanning electron microscope (SEM). The results showed that nano-sized spinel phase CoFe₂O₄ was uniformly dispersed on GO and the amino modification was successful. The adsorption performance of PEI-MGO to the reactive brilliant red X-3B in water was studied. The results indicated that the adsorption equilibrium could be reached under the following conditions: the initial mass concentration of reactive brilliant red X-3B was 150mg/L, the volume was 100mL, the dosage of adsorbent was 0.04g, the pH was 1 and the adsorption time was 60min. The equilibrium adsorption capacity was 361.15mg/g. The saturated adsorption capacity of PEI-MGO to reactive brilliant red X-3B was 470.58mg/g. The magnetic separation and magnetic recovery experiments indicated that PEI-MGO could be quickly separated from water, and the recovery rate was 98.6%.