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采用硝酸氧化和乙二胺聚合在微波辅助磷酸活化中孔蔗渣基介孔炭孔道内修饰了含氮多胺基团,制备了多胺功能化生物质炭材料AC-EDA,分析了溶液pH、初始浓度和吸附时间等参数对材料吸附Pb(Ⅱ)影响,探讨了其动力学吸附行为与吸附机制.结果表明,多胺功能化炭材料AC-EDA对Pb(Ⅱ)有较好的吸附效率,5 min内可达饱和吸附量的70%;酸性条件下,增大溶液pH有利于Pb(Ⅱ)吸附;材料AC-EDA对Pb(Ⅱ)的吸附位能量存在差异化,在吸附初始阶段,吸附速率由颗粒内扩散控制,中后期主要由膜扩散控制;准二级方程能很好地描述多胺功能化炭材料对Pb(Ⅱ)的吸附动力学行为.AC-EDA对Pb(Ⅱ)的吸附是自发的吸热反应过程,提高温度对铅(Ⅱ)离子吸附有促进作用;D-K-R吸附能>11 kJ·mol-1,表明化学反应在Pb(Ⅱ)吸附过程中起主导作用;吸附Pb(Ⅱ)前后的AC-EDA材料XPS图谱表明,多胺基团参与了吸附反应,是材料高效吸附Pb(Ⅱ)的重要因素.
The polyamine-functionalized carbonaceous material AC-EDA was prepared by nitric acid oxidation and ethylenediamine polymerization in the mesoporous mesoporous carbonaceous mesoporous carbon channel modified by microwave-assisted phosphoric acid. The effects of pH, Initial concentration and adsorption time on the adsorption of Pb (Ⅱ) on the materials were studied.The kinetic adsorption behavior and adsorption mechanism were discussed.The results showed that the adsorption capacity of Pb (Ⅱ) by AC-EDA with polyamine functionalization was good , And up to 70% of the saturated adsorption capacity within 5 min. Under acidic conditions, increasing the pH of the solution favored the adsorption of Pb (Ⅱ). The adsorption energy of Pb (Ⅱ) , The adsorption rate was controlled by intraparticle diffusion and controlled by membrane diffusion in the middle and late stages. Quasi-second order equation can describe the adsorption kinetics of Pb (Ⅱ) ) Adsorption is a spontaneous endothermic reaction, and increasing temperature has a positive effect on the adsorption of Pb (Ⅱ) ion. The adsorption energy of DKR is> 11 kJ · mol -1, indicating that the chemical reaction plays a dominant role in the adsorption of Pb (Ⅱ) The XPS spectra of AC-EDA before and after the adsorption of Pb (Ⅱ) showed that polyamine groups participated in the adsorption reaction, Important factors Pb (Ⅱ) efficient adsorption.