Preparation Of Poly(Amidoamine) Modified Graphene Oxide And Its Application In Adsorption For Heavy Metal Ions And Catalytic Reactions

Graphene is a flat monolayer of SP2hybrid carbon atoms packed into atwo–dimensional (2D) honeycomb lattice tightly. Since being first reported in2004,graphene has attracted tremendous attention and interest of scientists because of itsunique structure and excellent properties. The unique properties like2D structure,large surface area and rich functional groups make oxide graphene an ideal carrier fornew composite materials. In this study, poly(amidosmine) modified graphene oxide(GO–PAMAM) was prepared via a grafting–from way and characterized by Fouriertransform infrared spectroscopy (FT–IR), X–ray photoelectron spectroscopy (XPS),scanning electron microscopy (SEM) and atomic force microscopy (AFM), and theadsorbability of GO–PAMAM composite was evaluated by adsorption experiments.Besides, Pd nanoparticles were loaded on GO–PAMAM composite to prepared theGO–PAMAM–Pd catalyst, and the cagalytic activity of the composite was tested bySuzuki reaction.The main results obtained are as follows:1. GO–PAMAM composite was successfully prepared via a grafting–from way,the PAMAM dendrimers distributed on the whole surface of GO, and theamount of amines is about5.05mmol g-1. The adsorption experimentsdemonstrated GO–PAMAM composite has obvious advantage over GO andactive carbon (AC). Surprisingly, GO–PAMAM and GO had almost converseadsorption capacity with AC due to their unique structure.2. GO–PAMAM–Pd composite catalyst was successfully prepared via a simpleway. The results of SEM, TEM and XPS demonstrated Pd nanoparticles werewell dispersed on the surface of GO–PAMAM composite and the massfraction of Pd was9.26%. Evaluation of its catalytic performancedemonstrated the GO–PAMAM–Pd composite has extraordinary catalyticactivity for Suzuki reaction compared with commercial Pd–C catalyst.