聚乙烯亚胺改性聚苯胺/氧化石墨烯对Cr(Ⅵ)的吸附性能

采用聚乙烯亚胺(PEI)对聚苯胺/氧化石墨烯(PANI/GO)进行改性得到PEI-PANI/GO,通过XRD、FTIR、BET和SEM技术对PEI-PANI/GO进行表征,并考察了PEI-PANI/GO对溶液中Cr(Ⅵ)的吸附性能。表征结果显示,PEI-PANI/GO材料以介孔为主,比表面积为35.12 m;/g,孔体积为0.098 24 cm;/g。实验结果表明,在温度为20 ℃、体系pH为3、溶液中Cr(Ⅵ)初始质量浓度为400 mg/L的条件下,PEI-PANI/GO对Cr(Ⅵ)的平衡吸附量达117.63 mg/g。PEI-PANI/GO对溶液中Cr(Ⅵ)的吸附行为更符合准二级动力学模型和Langmuir等温吸附模型,表明吸附过程是单分子层吸附。经过循环吸附再生后第4次使用,PEI-PANI/GO对Cr(Ⅵ)的吸附量从117.63 mg/g降至84.27 mg/g,仍能保持71.64%的吸附量,说明其重复使用性能良好。

Adsorption ability of polyethyleneimine modified polyaniline/graphene oxide to Cr(Ⅵ)

Polyaniline/graphene oxide (PANI/GO) was modified by polyethylene imine (PEI) to obtain PEI-PANI/GO composite.PEI-PANI/GO was characterized by XRD,FTIR,BET and SEM,and its adsorption ability to Cr(Ⅵ) in aqueous solution was investigated.The characterization results showthat the PEI-PANI/GO material is mainly mesoporous,with specific surface area of 35.12 m;/g,and pore volume of 0.098 24 cm;/g.The experimental results indicate that the equilibrium adsorption quantity of PEI-PANI/GO to Cr(Ⅵ) reaches to 117.63 mg/g under the conditions of temperature 20 ℃,system pH 3 and initial Cr(Ⅵ) mass concentration 400 mg/L.The adsorption behavior of Cr(Ⅵ) onto PEI-PANI/GO is more consistent with the pseudo second-order kinetic model and Langmuir isothermal adsorption model,which indicates that the adsorption process is a monolayer adsorption.After 4 times of adsorption-desorption cycle,the adsorption quantity of Cr(Ⅵ) on PEI-PANI/GO decreased from 117.63 mg/g to 84.27 mg/g,which still maintains 71.64%,and demonstrate its good reusability.