| 초록 |
We report amino functionalized thermally stable graphene oxide based dendrimer (GOD) for the excellent removal of platinum group metals (PGMs) including palladium (Pd(II), PdCl42-) and platinum, (Pt(IV), PdCl62-) from acidic aqueous solutions. The as-fabricated GOD was characterized using FTIR, TGA, N2 sorption isotherm, solid state 13C NMR, and TEM. The material showed the highest ever adsorption capacities of 827.82 mg/g and 890.70 mg/g for Pt(IV) and Pd(II) at pH: 1, respectively. The kinetic and isotherm data fitted the best with the pseudo-second-order kinetic model and Langmuir isotherm model, respectively. It can be assumed that hydrogen bonding, electrostatic interaction, and cationic-π bonding interaction between the sorbent and sorbates play crucial roles during sorption. Moreover, both GOD and PGMs were able to be regenerated for five consecutive cycles. XPS and XRD analyses were performed to check the efficiency of the spent material. The material exhibited excellent regeneration (~97% after 5th cycle) characteristics, indicating the remarkable stability of GOD during sorption cycles. |
