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《Journal of Forestry Engineering》 2018-01
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Preparation of porous carbon ceramics from waste powdered activated carbon and its adsorption properties

ZUO Songlin;LI Juan;LI Yebin;College of Chemical Engineering,Nanjing Forestry University;Jiangsu Provincial Key Lab for the Chemistry and Utilization of Agro-forest Biomass,Jiangsu Key Lab of Biomass-based Green Fuels and Chemicals;  
In order to provide a newmethod to reuse the waste powdered activated carbon,porous carbon ceramics were prepared by kneading,extruding and sintering of mixture of waste powdered activated carbon as carbon sources and attapulgite clay as binders. The pore structure and morphology of the prepared porous carbon ceramics were analyzed by using nitrogen adsorption,scanning electron microscopy and X-ray diffraction. The adsorption ability and mechanical strength of the porous carbon ceramics were evaluated by testing their adsorption capacity of iodine,methylene blue,phenol and humic acid,and hardness. The effects of binder dosage,sintering temperature and time on the hardness,pore structure of carbon ceramics and their adsorption capacity of humic acid in aqueous solution were investigated; and the effect of p H value,the adsorption temperature on the adsorption capacity of humic acid were studied. The results showthat the binder dosage,sintering temperature and time have an influence on the pore structure,hardness and adsorption capacities of the carbon ceramics. This method can be used to prepare porous carbon ceramics that have specific surface area as high as 607 m2/g,total pore volume of 0.720 cm3/g and strength of 98% when the mass ratio of the binder to rawmaterial is 1 ∶4,sintering temperature is 800℃ and sintering time is 0.5 h. These carbon ceramics are characterized by developed mesopores,and the equilibrium adsorption capacity of humic acid can reach 193.3 mg/g,which is much higher than that of commercially available extruded activated carbon products. The p H value of humic acid solution and adsorption temperature have significant influence on the adsorption ability of carbon ceramic to humic acid. The adsorption capacity of humic acid reaches the maximum when p H value increases to 3.The increase of the adsorption temperature from 30℃ to 45℃ enhances the humic acid adsorption performance of the porous carbon ceramics.
【Fund】: 国家林业公益性行业科研专项(201404611)
【CateGory Index】: TQ424.1
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