SYNTHESIS OF MESOPOROUS METHYL-SILICA HYBRID FOR ADSORPTION OF ALIZARIN RED-S
ABSTRACT: Mesoporous
methyl-silica hybrid has been synthesized through sol-gel process, by using
tetraethylorthosilicate and methyltriethoxysilane as precursors and tartaric
acid as a template. The adsorbent was applied to study the adsorption of
alizarin red-S. The preparation of methyl-silica hybrid was carried out at various
mol ratios of precursors and tartaric acid concentration. The methyl-silica
hybrid result was characterized by infrared spectroscopy, X-ray diffraction,
and surface area analyzer. Adsorption experiment was conducted to study the
effect of pH and Alizarin Red-S concentration on the adsorption capacity of the
adsorbent. The adsorbed Alizarin Red-S was calculated from different of
Alizarin Red-S concentration before and after adsorption based on the analysis
with UV-Vis method. Characterization with Infrared Spectroscopy showed that
methyl-silica hybrid has been successfully synthesized as indicated by
appearance of characteristic functional group vibrations i.e Si-C, silanol
(Si-OH) and siloksan (Si-O-Si). The X-ray diffraction data showed amorphous
structure of methyl-silica Hybrid. The Surface Area Analyzer analysis data
showed that the pore diameter and surface area of methyl-silica hybrid tended
to increase as the template concentration increases. Adsorption study of
methyl-silica hybrid showed that the adsorption decreased as the pH was
increased. The optimum adsorption was obtained at pH=2.0 with the concentration
of Alizarin Red-S of 70 mg/L.
Penulis: Bambang Rusdiarso,
Eko Sri Kunarti, Saprini Hamdiani
Kode Jurnal: jpkimiadd080114
