4.7 Article

Dynamic pyrolytic reaction mechanisms, pathways, and products of medical masks and infusion tubes

Journal

SCIENCE OF THE TOTAL ENVIRONMENT
Volume 842, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156710

Keywords

Medicalplasticwastes; Pyrolysis; TG-FTIR; Py-GC; MS; Reactionmechanisms

Funding

  1. National Natural Science Foundation of China [51978175]
  2. Natural Science Founda-tion of Guangdong Province, China [2022A1515010825]
  3. Sci-enti fi c and Technological Planning Project of Guangzhou, China [202103000004]

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This study characterized and verified the pyrolysis mechanisms and volatiles products of medical mask belts, mask faces, and infusion tubes. The results are important for the treatment of medical wastes.
Given the COVID-19 epidemic, the quantity of hazardous medical wastes has risen unprecedentedly. This study char-acterized and verified the pyrolysis mechanisms and volatiles products of medical mask belts (MB), mask faces (MF), and infusion tubes (IT) via thermogravimetric, infrared spectroscopy, thermogravimetric-Fourier transform infrared spectroscopy, and pyrolysis-gas chromatography/mass spectrometry analyses. Iso-conversional methods were employed to estimate activation energy, while the best-fit artificial neural network was adopted for the multi-objective optimization. MB and MF started their thermal weight losses at 375.8 degrees C and 414.7 degrees C, respectively, while IT started to degrade at 227.3 degrees C. The average activation energies were estimated at 171.77, 232.79, 105.14, and 205.76 kJ/mol for MB, MF, and the first and second IT stages, respectively. Nucleation growth for MF and MB and geometrical contraction for IT best described the pyrolysis behaviors. Their main gaseous products were classified, with a further proposal of their initial cracking mechanisms and secondary reaction pathways.

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