A simple route for consecutive production of activated carbon and liquid compound fertilizer from rice husk

Two useful materials (activated carbon and liquid compound fertilizer) were obtained from rice husk by a simple route which combined the processes of H3PO4 activation and KOH etching. The resulting activated carbon exhibited excellent performances, including low ash content, large surface area, high adsorption and electrochemical performances. The advantage of this route is that the waste water produced in this process was used to produce compound fertilizer containing Si, K and P. This technique provided an environmentally friendly production process for conversion of waste rice husk to high performance materials.