Abstract
AbstractActivated carbons were produced from walnut shell by fast activation with H3PO4in a spouted bed, and the influence of particles fluidization had been investigated. Experimental results showed that walnut shell particles with higher H3PO4impregnation ratios would be agglomerated in spouted bed, and difficult to fluidize. Therefore, an amount of quartz sands were added to assist fluidization of H3PO4impregnated walnut shell particles. The BET surface area of activated carbon prepared under fluidization would be obviously increased with H3PO4impregnation ratio, reaching 1549.6 m2/g for the mass ratio of H3PO4to walnut shell particles of 2 and activation temperature of 700°C. Meanwhile, both of the micro- and meso- pore volumes were increased. In addition, fluidization of particles had very little influence on activated carbon surface functional groups forming. It was found that the activated carbons contained more carbonyl groups (C = O), carboxyl groups (COOH) and some P-containing functional group.
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