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<p>The aim of this research was to investigate the important features of <i>teff straw</i> fibers and its utilization in the pulp and paper industry through soda-anthraquinone pulping process. Morphological characterization indicated the average length of <i>teff straw</i> and the derived indices were comparable to the most non-wood plants and Eucalyptus. The chemical composition analysis of <i>teff straw</i> showed a cellulose content of 39.4%, hemicellulose of 29.6%, lignin of 14%, extractive of 7.2%, and ash content of 6.78. Response surface methodology with central Composite design was used to compare and optimize the effects of cooking temperature 130℃ to 150℃, cooking time 60 to 120&#xa0;min, active alkali concentration 10 to 20% w/v and 0.20% w/w of anthraquinone based on oven dried <i>teff straw</i>. The responses evaluated were pulp yield and kappa number. The predicted optimized pulping results yielded 64.00% pulp (based on oven-dried <i>teff straw</i>) with a kappa number of 8.28. FTIR analysis confirmed the elimination of the non-cellulosic fiber compositions. The paper hand sheets of 60&#xa0;g/m<sup>2</sup> were prepared from the pulps produced at optimal conditions and tested for its mechanical properties showing breaking length of 4294&#xa0;m, tensile strength of 11.6 kN/m, tensile index of 42.1 Nm/g, tear index of 5.2 mN.m<sup>2</sup>/g, burst index of 1.41&#xa0;kPa.m<sup>2</sup>/g, and porosity of 19.5 se/100 air. The results indicated the tested morphological, chemical and strength properties were acceptable and made <i>teff straw</i> an alternative material for pulp and paper application.</p>

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Characterization of teff straw fibers and optimization of soda-anthraquinone delignification of the teff straw for pulp production using response surface methodology in view of agricultural waste valorization

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Anteneh Marelign Beyene,
  • Kebede Alemu Urgessa

摘要

The aim of this research was to investigate the important features of teff straw fibers and its utilization in the pulp and paper industry through soda-anthraquinone pulping process. Morphological characterization indicated the average length of teff straw and the derived indices were comparable to the most non-wood plants and Eucalyptus. The chemical composition analysis of teff straw showed a cellulose content of 39.4%, hemicellulose of 29.6%, lignin of 14%, extractive of 7.2%, and ash content of 6.78. Response surface methodology with central Composite design was used to compare and optimize the effects of cooking temperature 130℃ to 150℃, cooking time 60 to 120 min, active alkali concentration 10 to 20% w/v and 0.20% w/w of anthraquinone based on oven dried teff straw. The responses evaluated were pulp yield and kappa number. The predicted optimized pulping results yielded 64.00% pulp (based on oven-dried teff straw) with a kappa number of 8.28. FTIR analysis confirmed the elimination of the non-cellulosic fiber compositions. The paper hand sheets of 60 g/m2 were prepared from the pulps produced at optimal conditions and tested for its mechanical properties showing breaking length of 4294 m, tensile strength of 11.6 kN/m, tensile index of 42.1 Nm/g, tear index of 5.2 mN.m2/g, burst index of 1.41 kPa.m2/g, and porosity of 19.5 se/100 air. The results indicated the tested morphological, chemical and strength properties were acceptable and made teff straw an alternative material for pulp and paper application.