Synthesis and Characterization of Silica Gel of Waste Agate From The Nian Village of Timor Tengah Utara Regency Using Sol Gel Method

SANAM, Putra Reinho Rosario and POTE, Lodowik Landi and LATUMAKULITA, Gertreda (2022) Synthesis and Characterization of Silica Gel of Waste Agate From The Nian Village of Timor Tengah Utara Regency Using Sol Gel Method. IJCR (Indonesian Journal of Chemical Research), 7 (2). pp. 9-17. ISSN 2354-9610

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Abstract

Research on the synthesis and characterization of silica gel from agate waste from Nian Village, Timor Tengah Utara Regency using the sol gel method has been carried out. This study aims to determine the chemical composition, characteristics of silica gel synthesized of agate waste from Nian Village, Timor Tengah Utara Regency which can be used as a source of silica gel synthesis. The research method used is the sol gel method. This research was initiated by washing the agate waste powder with 2 M HCl to remove impurities. Furthermore, silica extraction was carried out by reacting it with 3 M NaOH to obtain sodium silicate. The sodium silicate obtained was then synthesized into silica gel by adding 3 M HCl dropwise until the pH was neutral. The synthesized silica gel was analyzed for composition by XRF and characterized by XRD and FTIR. The results showed that the chemical composition of agate waste powder with XRF obtained Si 35.6% and the largest content was Ca, namely 54.3%.The synthesized silica gel has a purity of 99.1% SiO2 and 97.6% Si. The results of characterization using XRD showed that the synthesized silica gel was in the form of an amorphous phase and the results of characterization of functional groups using FTIR showed the presence of siloxane and silanol functional groups.

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