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Removal of Pentachlorophenol by Adsorption on Magnetite-immobilized Chitin

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Abstract

The application of magnetite-immobilized chitin in pentachlorophenol (PCP) removal was demonstrated in this study. The physicochemical parameters for immobilization of chitin by magnetite, and for PCP adsorption using magnetite-immobilized chitin were optimized. For chitin immobilization, the optimized conditions were: magnetite to chitin (m:c) ratio at 1:2, initial pH 6, 25°C, 200 rpm and 60 min in batch system. The immobilization efficiency (IE) was 99.4% and immobilization capacity (IC) was 2.0 mg chitin mg−1 magnetite. High initial pH (pH > 11) and temperature (>30°C) lowered the IE and IC. For PCP (10 mg l−1) adsorption, the optimized conditions were: 1,500 mg l−1 immobilized chitin, initial pH 6, 25°C, 200 rpm and 60 min in batch system. The removal efficiency (RE) was 57.9% and removal capacity (RC) was 5.4 mg g−1. The adsorption ability of immobilized chitin decreased with pH and temperature increased. However, increasing the amount of immobilized chitin (24,000 mg l−1) can increase the RE up to 92%. Both chitin immobilization and PCP adsorption exhibited Langmuir and Freundlich adsorption isotherms. Results in this study indicated that magnetite-immobilized chitin was a cost-effective and environmental friendly adsorbent to remove environmental pollutants such as PCP.

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Acknowledgements

This research project was supported by a research grant from the Research Grants Council, Hong Kong SAR Government and a grant from the Research Committee of The Chinese University of Hong Kong to P.K. Wong.

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Authors and Affiliations

  1. Department of Biology, The Chinese University of Hong Kong, Shatin, NT, Hong Kong

    K. M. Pang, W. K. Chung & P. K. Wong

  2. International Chitin Production Inc., 8596 Fraser Street, Vancouver, BC, Canada

    S. Ng

  3. Environmental Science Programme, The Chinese University of Hong Kong, Shatin, NT, Hong Kong

    P. K. Wong

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  1. K. M. Pang
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  2. S. Ng
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  3. W. K. Chung
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  4. P. K. Wong
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Correspondence to P. K. Wong.

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Pang, K.M., Ng, S., Chung, W.K. et al. Removal of Pentachlorophenol by Adsorption on Magnetite-immobilized Chitin. Water Air Soil Pollut 183, 355–365 (2007). https://doi.org/10.1007/s11270-007-9384-2

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  • DOI: https://doi.org/10.1007/s11270-007-9384-2

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