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Bangladesh Council of Scientific and Industrial Research, Institute of Glass and Ceramic Research and Testing, University of Dhaka, Dhaka, Bangladesh
Water in oil reverse microemulsion synthesis and characterization of silica nanoparticles and removal of impurity from silica nanoparticles have been focused. A study has been established for the synthesis of non-agglomerated spherical silica nanoparticles. These nanoparticles were characterized using SEM-EDS, XRD, and TGA. After purification silica nanoparticles were characterized by UV and ICP-MS. SEM image reveals that spherical particle size of Silica nanoparticles are obtained in about 1 nanometer scale in a non-agglomerated form. The elemental composition of SiCl4•5H2O was determined using EDS. The major elements are 3.33 of O and 0.2 of Si (% by weight). Sharp XRD pattern confirms crystalline structure of Silica nanoparticles. There is presence of other phase’s peaks due to impurities into Silica nanoparticles. TGA explain that weight loss has occurred around 100°C of silica nanoparticles indicates the removal of absorbed and residual water. The data reveals that a total mass loss of 29.23% and 48.63% at around 100°C for the SiO2 NPs. The impurities in chemically treated silica nanoparticles before and after purification were analyzed by UV-vis and ICP-MS method. It was found that chemical treatment is very pronounced by ICP-MS in the removal of certain impurities such as aluminum and Sodium but other impurity Fe is less affected. The effects of acids on the removal of impurity from Silica NPs have been studied using acid leaching: successive two mixtures composed of HCl; HCL: HNO3 with a volume composition of 1; (2:1) respectively. UV-visible light absorption measurements were applied for the evaluation of the nature and the concentration of the dissolved impurities.
Synthesis, Silica Nanoparticles, Characterization, Impurity Removal, Acid Leaching
Rexona Khanom. (2022). Synthesis and Characterization of Silica Nanoparticles and Study of Impurity Removal from Silica Nanoparticles by Acid Leaching. American Journal of Nanosciences, 8(3), 31-36. https://doi.org/10.11648/j.ajn.20220803.11
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