Adsorption of Organic Compounds with Different Molecular Sizes on Activated Carbons with Different Pore Diameters

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  • Oishi Shohei
    Graduate School of Engineering, Chiba University
  • Amano Yoshimasa
    Graduate School of Engineering, Chiba University Safety and Health Organization, Chiba University
  • Machida Motoi
    Safety and Health Organization, Chiba University Graduate School of Engineering, Chiba University

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Several activated carbons (ACs) were prepared from bamboo chips (BCs) with ZnCl2 activation. The influences of the specific surface area and pore size distribution on the adsorption of dyes, such as 2-naphthol (2-N, MW: 144), methylene blue (MB, MW: 320), and congo red (CR, MW: 697) were investigated using each prepared AC. AC with different mesopore volumes and same surface chemistry could be prepared by ZnCl2 activation. In particular, the sample activated with the ZnCl2/BC mass ratio of 6 (Z6) showed a remarkable increase in the specific surface area and mesopore volume to values as high as 2050 m2/g and 1.1 cm3/g, respectively. The results of all adsorption experiments revealed that MB and CR were adsorbed on mesoporous AC more efficiently than on microporous AC, and no CR adsorption onto microporous AC was observed. Further, the adsorbed amount of 2-N, with small molecule size, was dependent on the specific surface area rather than mesopore volume.

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