Abstract
Processing of agro-waste into functional materials has caught the attention of scientist and technologist in recent times. The agro-waste can be used to generate energy and new functional materials. Different techniques were developed to generate new chemicals from the waste. Rice husk (RH) is one of the waste material produced from rice production. Two methods (direct burning and reflux) were developed to extract the silica (SiO2) from RH. The extracted silica was immobilized with sodium hydrogen sulfate. The resulting solid catalysts had specific surface area of 274, and 307 m2 gm−1 for the direct and reflux method respectively. The carbon and sulfur content was slightly higher in the catalyst prepared under reflux condition as compared with the direct method. The FT-IR showed that the functional groups on the catalyst were not changed in the products. The thermal and morphological studies did not show too many changes on the catalyst. The XRD pattern of the catalyst from the direct method show some crystallinity as compared with that produced by the reflux method. Both solid catalysts together with NaHSO4 (as a homogeneous catalyst) were used in the hydrolysis of cellulose. These catalysts were also used in the in-situ hydrolysis of glucose to other product. It was found that approximately 99% of cellulose was hydrolyzed to glucose at 120 ◦C in six hours.
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Hasan, D.M., Hello, K.M. Fabrication of sodium hydrogen sulfate onto silica from waste for biomass energy. Chemistry Africa 4, 849–859 (2021). https://doi.org/10.1007/s42250-021-00279-z
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DOI: https://doi.org/10.1007/s42250-021-00279-z