Abstract
In Kenya activated carbon is imported yet we have enough bagasse that can be used in its production. The activated carbon from bagasse adds economic value to the bagasse and the processing excess bagasse provides for good utilization and management of the bagasse as a waste. The objective was to produce activated carbon from bagasse from Chemelil sugar factory on laboratory scale in a fabricated retort and furnace at selected conditions of temperature and time, characterize and give a comparison with the commercial activated carbons. Using molasses as a binder, ratio 1:1, the bagasse and molasses mixture was compressed into pellets in an extruder, heated to produce a char, and then activated using carbon dioxide, before finally being ground into powdered activated carbon. Carbonization was done in a retort, while the heating was done by two gas burners. Temperature, was controlled between 300 – 700 oC. The carbonized material (char) was cooled and ground to powder. Sample activation was conducted in an atmosphere of carbon dioxide passing through a chrome-nickel pipe with a gas distributor mounted in a furnace of porcelain cylinder with a metal sheet having one end closed. Air and nitrogen were used to control burning and the temperature of the furnace was controlled to between 300 – 600 oC. The activated carbons produced were characterized for their physical properties (bulk density, surface area, and micro pore volume and pore size), chemical properties (ash, pH, conductivity) and compared with selected two commercial activated carbons. The results showed that carbon materials activated from bagasse for 5 h at a temperature of 600 oC had similar characteristics with the commercial ones and therefore an inexpensive substitute with further process development on surface area.
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