Chitosan/silica hybrids ( Chitosan/ SiO2) using a sol-gelprocess were prepared at a wide range of in situ silica content from 0% to 100%. This work was undertaken to investigate the thermal properties, optical, adsorption, and biodegradability properties of this type of hybrid. Fourier transform infrared (FTIR) spectra were recorded to depict the interfacial interaction. Thermogravimetric analysis was used to determine the actual silica content forming in the hybrids and to evaluate the enhanced heat resistance of hybrids resulting from silica. Crystallography was illustrated using an X-ray diffractometer. Fracture surface was revealed through a scanning electron microscopy/energy dispersive spectrometer (SEM/EDS) to probe the dispersion degree of SiO2, which in turn confirmed the results of optical property on the formation of nanocomposites. To prevent the dissolution of chitosan and silica in the acid and alkaline solution, respectively, all prepared hybrids are capable of chelating Cu (II) as well as Fe (III) in a large degree. In addition, the hybrids are biodegradable based on the lysozyme treatment. Thus, chitosan/silica hybrids are of benefit as suitable environmental biomaterials and adsorbents under a wide range of conditions.
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POLYMER-PLASTICS TECHNOLOGY AND ENGINEERING Volume: 45 Issue: 9 Pages: 997-1003
