In situ preparation of biochar coated silica material from rice husk

An alternative approach to the utilization of lignocellulosic biomass is reported in this paper. It was the first time that rice husk was used as carbon source to synthesize carbon coated silica particles. Rice husk was hydrolyzed and mixed with silica powder, then biochar coated silica particles were simply in situ synthesized. The coating morphology was similar to those who used pure chemicals or glucides as carbon source, while the mild reacting conditions could keep some organic functional groups on the particle surface and make the modification easier. Acid could be recycled to form a semi-closed reaction system. The composite was designed as one of the bases for the preparation of activated carbon shell. Thus, this paper may provide a low-cost and simple method to prepare functional materials.

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► Rice husk was used as carbon source to synthesize biochar coated silica particles.
► Reaction was under mild water-bath temperature.
► Acid could be recycled.
► The composite was designed as a base to prepare activated carbon shell.