Biosilica recovery from pulped rice husk by acid precipitation

Sapei, Lanny and Suseno, Natalia and Riadi, Lieke and Padmawijaya, Karsono Samuel and Wurarah, Thia Sari Gloria and Dewi, Viviana (2018) Biosilica recovery from pulped rice husk by acid precipitation. In: Chemeca 2018: Chemical Engineering in Autralasia. Institution of Chemical Engineers, New Zealand. ISBN 9781911446682

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Rice husk is amongst the abundant agricultural wastes in rice-producing countries, such as Indonesia. About 20% mass of the whole rice is rice husk. Furthermore, silica content in rice husk is quite high of about 20%. Therefore, rice husk has a potential to be used as an alternative source of biosilica which could be further used as adsorbent or catalyst support. In this research, 2 types of acids, i.e. HCl and H2SO4 were compared in terms of their effectiveness during biosilica recovery from pulped rice husk. Rice husk was first pulped with 1 M NaOH at elevated temperature to dissolve silica and then filtered. Precipitation of silica was induced by the addition of acids until pH of 7 was reached. The mixture was aged for 72 hours prior to silica recovery. The results showed that HCl treatment was more effective compared to H2SO4 treatment. The silica obtained from was whiter in color and has a higher purity based on SEM/ EDX analysis. Furthermore, the silica was proved to be amorphous while the silica obtained from H2SO4 treatment showed the onset of crystalline silica. Additionally, the concentration of silica in the particle obtained from HCl treatment was ~24% based on SEM/ EDX analysis, which was almost double of that obtained from H2SO4 treatment. This process enabled biosilica recovery which has an added value out of low cost rice husk wastes.

Item Type: Book Section
Uncontrolled Keywords: HCl, H2SO4, precipitation, pulping, rice husk, silica.
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering > Department of Chemical Engineering
Depositing User: Ester Sri W. 196039
Date Deposited: 07 Jan 2019 02:11
Last Modified: 17 Nov 2020 04:07

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