Analisis dan Karakterisasi Kandungan Silika (SiO2) sebagai Hasil Ekstraksi Batu Apung (Pumice)

Trianasari Trianasari, Posman Manurung, Pulung Karo Karo

Abstract


The study of silica from pumice was done by extraction method using NaOH, H2SO4, and HCl. Powder of pumice before extraction was calcined at 450oC for 4 hours. The extraction powder was calcined at 800 °C for 3 hours. The powder before and after the extraction were characterized by XRD and SEM-EDS. Sample also characterized by DTA-TGA analysis before extraction and after extraction was analyzed by TEM. XRD pattern powder of pumice dominated by amorphous silica. The results have been confirmed with SEM-EDS showing that the silica content has the highest percentage, ie 65.88% for the sample before extraction and 78.95% for the sample after extraction. From the TEM observation it shows spherical particles, with particle size of 5.8 ± 0.2 nm. DTA-TGA analysis for pumice powder shows the occurrence of endotherm and exothermic events accompanied by mass shrinkage along with warming temperature rise.

Keywords


pumice, silica, extraction method, and nanostructure

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DOI: http://dx.doi.org/10.23960%2Fjtaf.v5i2.1814

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