멀티터미널 자성중심 덴드리머의 개발 및 크롬과 메틸오렌지의 흡착평가

Abstract

Dendrimers are highly branched macromolecules that radiated from a central core with a repeating motif of branching groups. Due to their manageable mass, uniform structure, surface functionality and high binding affinity for metal ions, they have been researched for various uses. As the complexation of metal ions with dendrimer is pH-dependent, the adsorbed metal ions can be recovered and reused. Especially, dendrimer-conjugated magnetic nanoparticles can easily recover heavy metals with magnetic separation. However, dendrimers were only used for adsorption of heavy metals. Up to now, adsorption of methyl orange has not been investigated by dendrimers. In this research, multi-terminalized magnetic-core dendrimer (MTMD), which consists of carboxyl group and methyl group, is synthesized and evaluated for adsorption capacity of both cadmium and methyl orange. The samples were prepared in three steps: (1) preparation of magnetic-core, (2) growth of dendrimer branches with a repeating motif of ethylene diamine and methyl acrylate, and (3) development of multi functional groups by methyl propionate and glutaric acid. Transmission electron microscopy and X-ray diffraction measurement showed MTMD has magnetite core and 5-10nm size. Fourier Transform Infrared Spectroscopy measurement showed both functional groups presence in one core. ThermoGravimetric Analysis measurement showed each generation of dendrimers grew well.. Atomic Absorption Spectrophotometer and UV/Visible spectroscopy measurement showed each dendrimer group could adsorb cadmium and methyl orange.