Chemical pyrolysis of E-waste plastics: Char characterization

Shen, Yafei; Chen, Xingming; Ge, Xinlei; Chen, Mindong

doi:10.1016/j.jenvman.2018.02.096

Cited by 50 publications

(17 citation statements)

References 31 publications

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“…Practical identical elucidations have been discovered in the literature [37,63]. Next, a broad 1094 cm −1 absorption band was identical to the hydrocarbon groups, which are mostly comprised of monosubstituted benzene.…”

Section: Functional Group Analysissupporting

confidence: 62%

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

et al. 2021

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Yields of carbonaceous char with a high surface area were enhanced by decreasing the temperature to improve the conversion of hazardous plastic polypropylene (PP), the major component in abundantly used isolation gowns. This study applied pyrolysis with different low pyrolytic temperatures to convert disinfected PP-based isolation gown waste (PP-IG) into an optimised amount of char yields. A batch reactor with a horizontal furnace was used to mediate the thermal decomposition of PP-IG. Enhanced surface area and porosity value of PP-IG derived char were obtained via an optimised slow pyrolysis approach. The results showed that the amount of yielded char was inversely proportional to the temperature. This process relied heavily on the process parameters, especially pyrolytic temperature. Additionally, as the heating rate decreased, as well as longer isothermal residence time, the char yields were increased. Optimised temperature for maximum char yields was recorded. The enhanced SBET values for the char and its pore volume were collected, ~24 m2 g−1 and ~0.08 cm3 g−1, respectively. The char obtained at higher temperatures display higher volatilisation and carbonisation. These findings are beneficial for the utilisation of this pyrolysis model in plastic waste management and conversion of PP-IG waste into char for further activated carbon and fuel briquettes applications, with the enhanced char yields, amidst the COVID-19 pandemic.

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Section: Functional Group Analysissupporting

confidence: 62%

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

et al. 2021

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“…The authors found that resins in waste PCB decompose intensively in the temperature range of 300-400°C. Below 300°C mass loss of the PCB sample is rather negligible, however above 400°C gradual and relatively small mass loss is also observed [10][11][12][13][14][15]. For inverter PCB sample investigated in this paper, intensive increase of the gas flow which may be related to the decomposition started at lower temperature, somewhat above 200°C.…”

Section: Resultsmentioning

confidence: 78%

Decomposition of LCD screen inverter by pyrolysis

2019

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PCBs (Printed Circuit Boards) are important parts of electronic equipment and their use increases with technology development. Recycling of waste PCBs is challenging due to their complex structure and receives wide concerns as the amount of this type of waste is growing rapidly. In the article, the experiment of pyrolysis carried out with electronic waste sample was presented. The material employed in the present work was inverter of the LCD screen that it the example of the multilayer PCB. The correlation between pyrolysis temperature and gas emission from the system, which is associated with epoxy resin decomposition, is presented in the article.

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“…There are few direct studies on the pyrolysis properties of ICs [13], but there are many studies on the pyrolysis properties of waste PCBs, which are similar to those of ICs [5,14,18,31,32]. These studies and the component analysis of ICs can provide some basic information about their behavior as well as potential products and applications in their thermochemical conversion processes.…”

Section: Pyrolysis Properties Of Icsmentioning

confidence: 99%

“…Approximately 45 million tons of electronic waste (E-waste) were produced in 2012 around the world [3,4] and according to UN statistics, in 2018, there were 48.5 million tons of E-waste worldwide. E-waste is growing rapidly [5].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Characteristics and Non-Isothermal Kinetics of Integrated Circuits

Chen

Liu²,

Wang

et al. 2022

Materials

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Due to the complexity of components and high hazard of emissions, thermochemical conversions of plastics among waste-integrated circuits (ICs) are more favorable compared with the common treatment options of electronic waste (E-waste), such as chemical treatment and burning. In this study, the waste random-access memory, as the representative IC, was used to investigate the thermal degradation behaviors of this type of E-waste, including a quantitative analysis of pyrolysis characteristics and non-isothermal kinetics. The results show that the pyrolysis of the ICs can be divided into three different decomposition stages. The pyrolysis temperature and gas atmosphere play an important role in the pyrolysis reaction, and the heating rate greatly affects the rate of the pyrolysis reaction. The non-isothermal kinetic parameters and reaction mechanisms of ICs are determined using the Friedman method, Coats and Redfern (CR) method, and Kissinger method. The results show that the actual average activation energy of the pyrolysis reaction of ICs should be between 170 and 200 kJ·mol−1. The optimally fitting model for the ICs pyrolysis is the three-step parallel model consisting of the random nucleation model (Am) and reaction order model (Cn).

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Chemical pyrolysis of E-waste plastics: Char characterization

Cited by 50 publications

References 31 publications

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

Low-Temperature Thermal Degradation of Disinfected COVID-19 Non-Woven Polypropylene—Based Isolation Gown Wastes into Carbonaceous Char

Decomposition of LCD screen inverter by pyrolysis

Pyrolysis Characteristics and Non-Isothermal Kinetics of Integrated Circuits

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