Abstract
The thermal degradation behaviors and reaction kinetics of medical waste infusion bag (IB) and nasal oxygen cannula (NOC) were investigated under inert atmosphere with the heating rates of 5, 10, 15, and 25 K·min−1. Ozawa–Flynn–Wall (OFW), Kissinger–Akahira–Sunose (KAS), and Friedman were employed to estimate the activation energy. Coats–Redfern and Kennedy–Clark methods were adopted to predict the possible reaction mechanism. The results suggested that the reaction mechanism of IB pyrolysis was zero-order, and that of NOC pyrolysis was concluded that zero-order for the first stage and three-dimensional diffusion Jander equation for the second stage. Based on the kinetic compensation effect, the reconstructed reaction models for IB and NOC pyrolysis were elaborated by introducing adjustment functions. The results indicated that the reconstructed model fitted well with the experimental data. The results are helpful as a reference and provide guidance for the determination of IB and NOC degradation behaviors and the simulation of parameters.
Highlights
Medical waste refers to the hazardous waste generated by hospitals, clinics, or other related medical institutions, which typically contains a variety of potentially infectious and toxic substances [1,2]
In order to obtain the kinetic triplets of thermal degradation more accurately and systematically, two common medical plastic wastes, infusion bag and nasal oxygen tube, were used as the research objects for the pyrolysis experiments under inert atmospheres at different heating rates by thermogravimetric analysis
There are one and two stages can be observed for infusion bag (IB) and nasal oxygen cannula (NOC) pyrolysis, respectively
Summary
Medical waste refers to the hazardous waste generated by hospitals, clinics, or other related medical institutions, which typically contains a variety of potentially infectious and toxic substances [1,2]. Deng et al carried out thermogravimetric analysis under nitrogen atmosphere to obtain pyrolysis kinetic parameters of tube for transfusion, sample collector for urine, and one-off medical glove by the Coats-Redfern method [3]. In order to obtain the kinetic triplets of thermal degradation more accurately and systematically, two common medical plastic wastes, infusion bag and nasal oxygen tube, were used as the research objects for the pyrolysis experiments under inert atmospheres at different heating rates by thermogravimetric analysis. OFW method, KAS method, and Friedman method were used to calculate the activation energy values of infusion bag and nasal oxygen tube pyrolysis. The results of this study would be useful to provide valuable information to reveal the development course of the pyrolysis and combustion of medical plastic waste such as infusion bag and nasal oxygen tube
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