Synthesis, Characterization of Silica Gel from Salacca edulis Reinw Stem by Sol-Gel Method STATE ISLAMIC UNIVERSITY
SUNAN KALIJAGA YOGYAKARTA
Author: Didik Krisdiyanto, Pradika Nurjanto, Imelda Fajriati and Pedy Artsanti Chemistry Department, Faculty of Science and Technology, UIN Sunan Kalijaga Yogyakarta Indonesia
Abstract The synthesis of silica gel from Salacca edulis Reinw stem with hydrochloric acid and sulfuric acid as gelation agents has been investigated. Silica gel was prepared by dissolving Salacca edulis Reinw stem ash with sodium hydroxide at 100 for 30 minutes to form sodium silicate. Gel formation was carried out by adding hydrochloric acid at various concentration 2, 4 and 6 m and sulfuric acid at various concentration 2, 4 and 6 m. The formed gel was washed with water and dried at 50 C for 18 hours. Silica gel was analyzed by XRD, FTIR and Surface Area Analyzer. Analysis result showed that XRD data indicate formation amorphous structure of silica gel. From FTIR data showed existence of silanol and siloxane groups of silica gel for different gelation agents. Surface area, total pore volume and pore diameter average were 2,983 m2/g, 0,005 cc/g and 15,172 Ǻ for hydrochloric acid agents. For sulfuric acid agents were 4,184 m2/g, 0,010 cc/g and 59,217 Ǻ for surface area, total pore volume and pore diameter average. It was conclude that silica gel had micropore, mesopore and macropore with dominant fraction at mesopore size.
Introduction
FTIR spectra
X-ray diffraction
Silica gel is widely used as a desiccant. Its role as a catalyst support, as a flatting agent in coatings and as a selective adsorbent in column chromatography is well established. Most commonly silica gels are manufactured by acidifying an aqueous solution of sodium silicate. silica gel from Salacca edulis Reinw stem with hydrochloric acid and sulfuric acid as gelation agents has been synthesied.
A
N2 physisorption B
C
Concluding remarks Analysis result showed that XRD data indicate formation amorphous structure of silica gel. From FTIR data showed existence of silanol and siloxane groups of silica gel for different gelation agents. Surface area, total pore volume and pore diameter average were 2,983 m2/g, 0,005 cc/g and 15,172 Ǻ for hydrochloric acid agents. For sulfuric acid agents were 4,184 m2/g, 0,010 cc/g and 59,217 Ǻ for surface area, total pore volume and pore diameter average
References Alba, M.D. and Klinowski,J,. 1996. Titano Silicates Mesoporous
Acknowledgements Chemistry department, Faculty of Science and TechnologyUIN Sunan kalijaga Yogyakarta for academic supported.
Molekuler Sieves MCM-41: Syntesis and Characterization,J.Phys.Chem Iler, R.K,. 1979 Silica Gels and Powder. New York: The Chemistry of Silica Ishizaki, K., Komareni, S., Nanko, M. 1998. Porous Material: Process Technology and Aplications, London: Kluwer Academic Publisher Kalapathy, U. Proctor, A. Schultz, J., 2002 Silicate Gel From Rice Hull Ash: Preparation and Characterization, Cereal Chemistry, 75:484–487.