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<p>The global outbreak of virus has led to a dramatic increase in the generation of medical waste, posing severe challenges to conventional disposal methods such as incineration and landfilling, which are associated with high risks of secondary pollution and low resource recovery efficiency. This study systematically investigates the thermochemical conversion potential of discarded face masks (FM) and nitrile gloves (NG). Characteristic pyrolysis products of both materials within the temperature range of 450–650&#xa0;°C were identified using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS): FM primarily produced 2,4-dimethyl-1-heptene, while NG was dominated by 1,3-butadiene. To elucidate the interaction mechanisms during co-pyrolysis, dynamic thermogravimetric analysis (TGA) combined with kinetic modeling was employed to explore the effects of blending ratios and heating rates (10–40&#xa0;°C/min) on the pyrolysis process. Experimental results revealed that when NG accounted for 50–75% of the mixture, the system exhibited a dynamic phase transition at the critical temperature of 495&#xa0;°C, where the synergistic effect shifted from negative to positive, indicating that the reaction pathway can be directionally regulated by adjusting the component ratio. More importantly, based on calculations using both the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) models, the average activation energy of the system at a FM/NG mass ratio of 1:1 significantly decreased to 265.78&#xa0;kJ/mol. This finding demonstrates that co-pyrolysis effectively overcomes the energy barrier from both thermodynamic and kinetic perspectives.</p>

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Synergistic co-pyrolysis of waste PP/PE composites: kinetic-thermodynamic investigation for hydrocarbon upgrading in medical waste treatment

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Hailong Yang,
  • Yanfen Liao,
  • Junxuan Huang,
  • Jiezhao Feng,
  • Xiaoqian Ma

摘要

The global outbreak of virus has led to a dramatic increase in the generation of medical waste, posing severe challenges to conventional disposal methods such as incineration and landfilling, which are associated with high risks of secondary pollution and low resource recovery efficiency. This study systematically investigates the thermochemical conversion potential of discarded face masks (FM) and nitrile gloves (NG). Characteristic pyrolysis products of both materials within the temperature range of 450–650 °C were identified using pyrolysis–gas chromatography/mass spectrometry (Py-GC/MS): FM primarily produced 2,4-dimethyl-1-heptene, while NG was dominated by 1,3-butadiene. To elucidate the interaction mechanisms during co-pyrolysis, dynamic thermogravimetric analysis (TGA) combined with kinetic modeling was employed to explore the effects of blending ratios and heating rates (10–40 °C/min) on the pyrolysis process. Experimental results revealed that when NG accounted for 50–75% of the mixture, the system exhibited a dynamic phase transition at the critical temperature of 495 °C, where the synergistic effect shifted from negative to positive, indicating that the reaction pathway can be directionally regulated by adjusting the component ratio. More importantly, based on calculations using both the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) models, the average activation energy of the system at a FM/NG mass ratio of 1:1 significantly decreased to 265.78 kJ/mol. This finding demonstrates that co-pyrolysis effectively overcomes the energy barrier from both thermodynamic and kinetic perspectives.