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Preparation and Pore Structure of Jute-Based Activated Carbon Fibers by Microwave Assisted H3PO4 Activation

Various jute-based activated carbon fibers were prepared by using jute fibers as raw materials, phosphoric acid as activating agent and activated by microwave heating. The effects of phosphoric acid concentration, microwave radiation power and microwave radiation time on the adsorption properties of activated carbon fibers were investigated to obtain optimum preparation conditions. The pore structure analysis of the activated carbon were carried out on a ASAP 2010 Surface Area and Porosimetry Analyzer. Results showed that optimum preparation conditions were phosphoric acid concentration of 4 mol/L, microwave radiation power of 385 W and microwave radiation time of 10 min. The iodine adsorption value of jute-based activated carbon fiber prepared under optimum conditions is 938.54 mg/g, the specific surface area was 1154.91 m2/g, the pore volume was 0.5997 cm3/g and the adsorption average pore diameter was 2.0772 nm. Majority of large holes in JACF prepared under optimum conditions were distributed in the diameter range of 2-4 nm, demonstrating a mesoporous structure.