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<p>The relative impact of acidified glycerol pretreatment on thermal disintegration kinetics and thermodynamic parameters of crude wheat straw (WS) was studied using thermogravimetric analysis coupled with Horowitz-Metzger kinetic method under numerous reaction models. The WS fiber was dissolved in acidified glycerol solution under gentle pretreatment conditions of 90&#xa0;°C for 30&#xa0;min and was also pretreated by conventional methods including dilute alkaline, acid and hot water to foster a better insight and compare the capability of acidified glycerol for pretreatment of WS fiber. The apparent activation energy values of 27.8–31.8&#xa0;kJ/mol and 32.3–38.2&#xa0;kJ/mol were obtained for untreated and glycerol treated WS fibers, whereas the highest values, ranging from 36.2 to 42&#xa0;kJ/mol, were obtained for alkali treated fiber. The change in enthalpy (ΔH°) for untreated WS fiber was within the range of 50.9 to 59.3&#xa0;kJ/mol. This was enhanced to 59.8–71.6&#xa0;kJ/mol, 63.6–74.0&#xa0;kJ/mol and 63.1–74.9&#xa0;kJ/mol for acidified glycerol, acid and alkali treated WS fibers. Pretreatment with acidified glycerol and alkali reagents increased the ΔG° values of WS fiber to 181.2&#xa0;kJ/mol and 178.6&#xa0;kJ/mol, in contrast to the value of 167.7&#xa0;kJ/mol for untreated sample.</p>

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Comparative impact of acidified glycerol pretreatment on the thermal degradation kinetics of crude wheat straw for potential sustainable valorization

  • 期刊论文

  • 发表日期：

    2025年1月2日

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  • Hamayoun Mahmood,
  • Ali Raza,
  • Muhammad Raashid,
  • Atif Khan,
  • Saqib Mehmood

摘要

The relative impact of acidified glycerol pretreatment on thermal disintegration kinetics and thermodynamic parameters of crude wheat straw (WS) was studied using thermogravimetric analysis coupled with Horowitz-Metzger kinetic method under numerous reaction models. The WS fiber was dissolved in acidified glycerol solution under gentle pretreatment conditions of 90 °C for 30 min and was also pretreated by conventional methods including dilute alkaline, acid and hot water to foster a better insight and compare the capability of acidified glycerol for pretreatment of WS fiber. The apparent activation energy values of 27.8–31.8 kJ/mol and 32.3–38.2 kJ/mol were obtained for untreated and glycerol treated WS fibers, whereas the highest values, ranging from 36.2 to 42 kJ/mol, were obtained for alkali treated fiber. The change in enthalpy (ΔH°) for untreated WS fiber was within the range of 50.9 to 59.3 kJ/mol. This was enhanced to 59.8–71.6 kJ/mol, 63.6–74.0 kJ/mol and 63.1–74.9 kJ/mol for acidified glycerol, acid and alkali treated WS fibers. Pretreatment with acidified glycerol and alkali reagents increased the ΔG° values of WS fiber to 181.2 kJ/mol and 178.6 kJ/mol, in contrast to the value of 167.7 kJ/mol for untreated sample.