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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Adsorption by coniferous leaves of chromium ions from effluent

Journal of Wood Science volume 45, pages 266–270 (1999)Cite this article

Abstract

The chromium adsorption ability of leaves from 34 conifer species were examined. Among them, deciduous conifer species, such asLarix, Ginkgo, Metasequia, andTaxodium, showed high ability to adsorb chromium ions. Factors affecting chromium adsorption were studied using larch (Larix leptolepis) leaves to determine the optimum adsorption conditions. The factors included solution pH, contact time, temperature, and the initial concentration of chromium ions. Maximum adsorption for Cr3+ was observed at pH 5, and maximum Cr6+ adsorption occurred at pH 3. The amount of Cr6+ adsorbed on the adsorbent increased rapidly during the first 4 h, then gradually increased, and finally reached equilibrium in 16 h. The adsorption rate of Cr3+ was somewhat slower than that of Cr6+. The adsorption isotherm for Cr6+ adsorption was composed of two straight lines, suggesting that the adsorbent could not practically reduce the concentration of Cr6+ in solution below 1.6 mg Cr/L Column experiments using larch leaf packing suggested that the practical operation could be controlled by monitoring the effluent pH.

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Authors and Affiliations

  1. Department of Forest Products, Chungbuk National University, 360-763, Cheongju, Korea

    Nam-Seok Cho

  2. Hokkaido Forest Products Research Institute, 071-0198, Asahikawa, Japan

    Masakazu Aoyama, Kazuto Seki & Naotaka Hayashi

  3. Akita Prefectural College of Agriculture, Institute of Wood Technology, 016-0876, Noshiro, Japan

    Shuichi Doi

Authors
  1. Nam-Seok Cho
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  2. Masakazu Aoyama
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  3. Kazuto Seki
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  4. Naotaka Hayashi
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  5. Shuichi Doi
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Correspondence to Nam-Seok Cho.

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Cho, NS., Aoyama, M., Seki, K. et al. Adsorption by coniferous leaves of chromium ions from effluent. J Wood Sci 45, 266–270 (1999). https://doi.org/10.1007/BF01177738

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  • DOI: https://doi.org/10.1007/BF01177738

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