Synthesis of Green Chitosan – Silver Nanoparticle Composite Material: Parameter Optimization and Physicochemical Characterization
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초록
내용
In this study, Box-Behnken design through response surface methodology (RSM) was successfully applied for parameter optimization of the green chemical reduction synthesis of chitosan-silver nanoparticle composite material. Four parameters: chitosan concentration, AgNO3 concentration, ascorbic acid concentration and time with the objective to obtain minimum mean particle size of silver nanoparticles (response Y) were investigated. The chitosan-silver nanoparticle composite material (CTS-AgNPs nanocomposite) obtained experimentally from the optimal conditions was characterized by evaluating some of their physical-chemical properties using combined technique including visible ultraviolet spectroscopy (UV -Vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), infrared spectra (IR) and X-ray diffraction. The optimal conditions were chitosan concentration of 19.2 %, silver nitrate of 26 mM, ascorbic concentration of 33 mM and time of 4.25 hours. XRD patterns of CTS-AgNPs nanocomposite showed peaks at 2θ values of 38.2o, 44.5o, 64.6o that correspond to the (111), (200), (220) planes of face centered cubic for Ago. Tem and DLS indicated that spherical Ag particles obtained experimentally were well dispersed in chitosan matrix with the average diameter of around 2÷8 nm with a narrow size distribution and homogeneous dispersion.