Abstract
In this paper, a new cation exchanger is prepared by activating sawdust with epichlorohydrin, followed by coupling the epoxy-activated sawdust with aspartic acid. The sawdust cation exchanger (SCE) was investigated for its methylene blue (MB) removal capacity from aqueous solution. The removal experiments were performed under various conditions such as different initial pH, SCE dosage, dye concentration, ionic strength, and contact time in a batch system. The highest sorption capacity of MB was obtained beyond pH 4. The 2.0 g/l or more of SCE could remove above 95% of MB from 250 mg/l of dye solution. Increasing the ionic strength of the solution caused decline of MB sorption. The sorption isotherm conformed well to the Langmuir model. The sorption process could be described by the pseudo-second-order kinetic model.
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Acknowledgments
The authors would like to thank for the financial supports from China Postdoctoral Science Funds (20060390960), the Key Laboratory of Bioresource Protection and Utilization of Anhui Province, and the Key Laboratory of Biotic Environment and Ecological Safety in Anhui Province.
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Gong, R., Ni, S., Zhao, J. et al. Epichlorohydrin and aspartic acid incorporated into sawdust and application as sorbent for methylene blue. Wood Sci Technol 43, 183–193 (2009). https://doi.org/10.1007/s00226-008-0224-3
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DOI: https://doi.org/10.1007/s00226-008-0224-3