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Extraction of silica from fly-ash and fabrication of silica-clay composite for dye removal and kinetic studies.
- Source :
- Zeitschrift für Physikalische Chemie; Feb2023, Vol. 237 Issue 1/2, p147-161, 15p
- Publication Year :
- 2023
-
Abstract
- A facile and green approach to extract silica from the coal fly-ash waste is extremely critical for environmental sustainability and economically suitable. In this study, we have used acid-alkali coupled approach to improvised the proficiency of the extraction process. The sodium hydroxide (NaOH) soaking results the formation of the sodium silicate (Na<subscript>2</subscript>SiO<subscript>3</subscript>) solution then pure silica was obtained by heating at high temperature; this coupled route-way results better yield of silica (SiO<subscript>2</subscript>) which is ∼ 40 g. The efficiency of pure silica is not enough to remove toxic effluents from the aqueous media. A highly versatile approach of composite formation was adopted to fabricate silica-clay composite using kaolinite-clay and extracted silica. Both materials, extracted silica and its silica-clay composite were analyzed using scanning electron microscopy (SEM), energy dispersive X-ray (EDX) method, X-ray diffraction technique (XRD) and Fourier transform infra-red spectroscopy (FTIR). The silica-clay composite showed plate-tubular like morphology with enormous binding sites available for the sorption pollutants like organic dyes. It has shown excellent sorption of methylene blue (MB) efficiency of 131.5 mg/g, while silica furnished the sorption of 70.5 mg/g. Results revealed that the synthesized material could probably have better potential for dye removal from industrial effluents. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09429352
- Volume :
- 237
- Issue :
- 1/2
- Database :
- Complementary Index
- Journal :
- Zeitschrift für Physikalische Chemie
- Publication Type :
- Academic Journal
- Accession number :
- 161719309
- Full Text :
- https://doi.org/10.1515/zpch-2022-0137