INOR 259 |
| Water-soluble polyamine dendrimers were covalently attached to activated controlled pore glass beads (CPG, 22.6 nm pore size, 80-120 mesh) using various tether lengths. These surface tethered dendrimers (STDs) present multivalent sites on the nano-scale whose properties can be controlled by choice of dendrimer size, tether chemistry and the pH of the surrounding solution. As proof of principle, we prepared STDs for heavy metal ion extraction from 10-ppm solutions as a function of pH and dendrimer size using Atomic Absorption Spectroscopy (AAS). We find that 90% more copper ion binds to the tethered G5 dendrimer than the G3 (51 vs. 27 umol Cu/g support) at neutral pH. Other metal ions show smaller binding capacities with STDs. We will also discuss our efforts to further to use STDs as platforms for chelating groups such as IDA (iminodiacetic acid) or NTA (nitrilotriacetic acid) to create high densities of metal ion affinity sites. |
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Nanoscience: Applications
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster
Division of Inorganic Chemistry |