Journal
SEPARATION SCIENCE AND TECHNOLOGY
Volume 53, Issue 7, Pages 1006-1016Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01496395.2017.1330830
Keywords
Chitosan; epichlorhydrin; Gd-DTPA adsorption; hybrid nanocomposites; magnetite
Funding
- International Visegrad Fund (Visegrad/V4EaP Scholarship) [51500518]
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The method for chitosan (CS) covalent immobilization onto NH2-functionalized magnetite nanoparticles surface is presented. Covalent binding of CS to the magnetite surface proceeds using a free -CH2OH group of CS and a NH2-group of magnetite with epichlorohydrin (ECH) as a cross-linker. The obtained nanocomposites were functionalized by diethylenetriaminepentaacetic acid (DTPA)-groups. Composites were characterized by elemental analysis, FTIR, XPS and ASAP methods. The total content of organic phase (CS-DTPA) in the hybrid material, appreciated by thermogravimetric analysis (TGA), was 3.7%. Considering the atomic ratio between oxygen in CS and oxygen in ECH residue, the chemical structure of the hybrid material is proposed. The adsorption of Gd-DTPA and Gd3+ on the obtained nanocomposite was studied. The Freundlich isotherm fits all the experimental data better than the Langmuir adsorption.
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