New Sol-Gel Silica Hybrids Containing Pectin And Some Metal Ions

In the present study new silica hybrids containing pectin and some metal ions have been synthesised via a sol-gel method. Pre-hydrolysed tetraetoxysilane (TEOS), low methoxylated pectin (5 wt%), Co2+, Ce3+, La3+, Co2++Cu2+ (1wt%), C2H5OH, H2O & HCI have been used for the preparation of these hybrid materials. The structure of the hybrids obtained has been studied by means of XRD-analysis, FTIR-spectroscopy, SEM & UV transmittance spectroscopy. XRD patterns show that all samples are amorphous. FTIR spectra indicate that in the presence of TEOS, pectin undergoes the process of COOCH3 hydrolysis because the bands at 1390cm-1 and 1750cm-1 disappear. The presence of Co2+ partially inhibits this process, but Ce3+ does not influence it.