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http://dx.doi.org/10.4491/KSEE.2012.34.9.613

Synthesis of Multi-Terminalized Magnetic-Cored Dendrimer for Adsorption of Chromium and Enhancement of Magnetic Recovery  

Yeo, In-Hwan (Department of Civil and Environmental Engineering, Hanyang University)
Jang, Jun-Won (Department of Civil and Environmental Engineering, Hanyang University)
Kim, Lyung-Joo (Department of Civil and Environmental Engineering, Hanyang University)
Park, Jae-Woo (Department of Civil and Environmental Engineering, Hanyang University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.34, no.9, 2012 , pp. 613-622 More about this Journal
Abstract
A chrome absorbent that is useful in rapid magnetic recovery and recycling was developed though a synthesis of Multi-Terminalized Magnetic-core Dendrimer (MTMD). Divergence through coprecipitation and rotation growth was used for synthesis. The dendrimer was multi-terminilized through methyl propionate and glutaric acid. The property analysis of the synthesized sample was performed through XRD, FT-IR, TEM, EDS, TGA and zeta potential analyzer. A magnetic-core of MTMD had a magnetite crystal and the size of 4th generation dendrimer was identified to be from 15 nm to 20 nm. Through the analysis of the TGA, the rate of the dendrimer branch for the first generation dendrimer was about 7% and 3% of diminished weight occurred as the generation grows. Also, the potential of the dendrimer when multi-terminalized, had variation from 25.26 mV to -6.53 mV. As a result of MTMD adsorption experiment, it absorbed more than 80% within 5 minutes and indicated absorptivity of 6.308 mg/g. When it was compared with COOH Dendrimer (COOH-D) after magnetic recovery, the recovery time was rapidly reduced by more than half and it could recover 100% within 30 minutes. In case of the regeneration experiment that used chrome, it was identified to maintain the same adsorptivity for four runs.
Keywords
Multi Terminal; Dendrimer; Nano; Magnet; Absorbent; Recycle;
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