Abstract
Technological advances in the field of nanomaterials have made several silica processing industries start producing silica nanoparticles so that the search for new sources capable of producing silica has been in great demand. One of the mineral resources that has the potential to be developed is silica (SiO2). Pumice is an amorphous porous volcanic rock consisting of silica. In this study, nanosilica was made from pumice stone by extracting it using NaOH solution at various concentrations of 2.5 M, 2.7 M, 2.9 M, 3.1 M and 3.3 M to observe its effect on the amount and chemical composition of nanosilica powder. resulting, the nanosilica phase formed and the size of the nanosilica. This silica extraction is made by sol-gel method using reflux. Silica gel formation was carried out using 5M H2SO4 and the refining process of silica powder using 1.25 M HCl then calcined at 800oC for 6 hours and characterized by XRF, XRD, TEM and FTIR. The results obtained in this study indicate the effect of NaOH concentration on the amount of powder produced, which increases with the increase in the concentration of NaOH used. The SiO2 composition of all samples showed optimum results in samples with a concentration of 2.7 M NaOH, namely 97.1% which also had SiO-Si and Si-OH bonds, had an amorphous phase and the mean particle size was (11.9 ± 2). , 6) nm.
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