Bambang Rusdiarso(1*), Eko Sri Kunarti(2), Saprini Hamdiani(3)

(1) Laboratorium of Inorganic Chemistry, Department of Chemistry, Universitas Gadjah Mada, Sekip Utara Bls 21, Yogyakarta, 55281
(2) Laboratorium of Inorganic Chemistry, Department of Chemistry, Universitas Gadjah Mada, Sekip Utara Bls 21, Yogyakarta, 55281
(3) Laboratorium of Inorganic Chemistry, Department of Chemistry, Universitas Gadjah Mada, Sekip Utara Bls 21, Yogyakarta, 55281
(*) Corresponding Author


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.


sol-gel; tartaric acid template; mesoporous; adsorption

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