聚酰胺-胺/氧化石墨烯复合材料的制备及其性能表征

Preparation and characterization of poly(amidoamine) modified graphene oxide

改性石墨通过接枝,合成了聚酰胺-胺(PAMAM)修饰的氧化石墨烯复合吸附材料(GO/PAMAMs)。考察了温度、pH、Pb^(2+)浓度和吸附时间对GO/PAMAMs吸附Pb^(2+)效果的影响。结果表明,GO经PAMAMs修饰后,彼此间形成共价键连接;在25℃、pH为6,Pb^(2+)浓度为500 mg/L,吸附时间为4 h时,GO/PAMAMs对Pb^(2+)的平衡吸附量达到337 mg/g。该吸附过程可以用Lagergren方程和Langmuir模型来描述,由化学反应控制,升温有利于吸附。

GO/PAMAMs composite was prepared via a grafting-from way. The effects of temperature,pH,Pb（2＋）concentration and time on the adsorption of Pb（2＋）on GO/PAMAMs were investigated. Results showed that GO was modified by PAMAMs and covalently bonded to each other; when the temperature was 25 ℃,the pH value was 6,the initial concentration of Pb（2＋） was 500 mg/L and the adsorption time was 4 h,the equilibrium adsorption capacity of GO/PAMAMs to Pb（2＋） reached 337 mg/g. The adsorption process can be described by the Lagergren equation and the Langmuir model,which was controlled by chemical reaction. Raising temperature was beneficial to adsorption reaction.