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Infrared spectroscopic study of thermally treated lignin

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Abstract

Precipitated lignin from black liquor produced from rice straw pulping was thermally treated at different temperatures (25 to 260 ° C) for 1h. Lignin was also thermally treated at 230 ° C for various time intervals (0.5 to 2h). The infrared spectra from 200 to 4000 cm−1 were studied. It was found that the absorbance of OH as well as OCH3 bands decreased with increasing temperature and heating time. On the contrary, C=0 increased with increasing temperature and time. The OH and OCH3 vibrational bands began to disappear when the temperature rose above 230 ° C. A correlation between the absorbance of OH, OCH3 and C=O is made to give more information concerning the effect of thermal treatment on the molecular structure changes of lignin.

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Authors and Affiliations

  1. Spectroscopic Department, National Research Centre, Dokki, Cairo, Egypt

    A. A. Shabaka

  2. Cellulose and Paper Department, National Research Centre, Dokki, Cairo, Egypt

    A. M. A. Nada

  3. Physics Department, Faculty of Science, Helwan University, Helwan, Cairo, Egypt

    M. Fadly

Authors
  1. A. A. Shabaka
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  2. A. M. A. Nada
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  3. M. Fadly
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Shabaka, A.A., Nada, A.M.A. & Fadly, M. Infrared spectroscopic study of thermally treated lignin. J Mater Sci 25, 2925–2928 (1990). https://doi.org/10.1007/BF00584905

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  • DOI: https://doi.org/10.1007/BF00584905

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