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Carbon nanotubes production from real-world waste plastics and the pyrolysis behaviour

Waste Management 2023 49 citations ? Citation count from OpenAlex, updated daily. May differ slightly from the publisher's own count.
Yuan Zhu, Jie Miao, Yingrui Zhang, Chunchun Li, Yuanyuan Wang, Yi Cheng, Mingce Long, Jiawei Wang, Chunfei Wu

Summary

Researchers produced carbon nanotubes from real-world waste plastics through pyrolysis, characterizing the thermal decomposition behavior of mixed plastic waste and demonstrating a valuable upcycling pathway for plastic pollution.

Polymers
PE PET PP PS

The investigation of the pyrolysis behaviour of real-world waste plastics (RWWP) and using them as the feedstock to produce carbon nanotubes (CNTs) could serve as an effective solution to address the global waste plastics catastrophe. This research aimed to characterize the pyrolysis behaviour of RWWP via thermogravimetric analysis (TG) and fast pyrolysis-TG/mass spectrometry (Py-TG/MS) analyses. Activation energies (131.04 kJ mol-1 -171.04 kJ mol-1) for RWWP pyrolysis were calculated by three methods: Flynn-Wall-Ozawa (FWO) method, Kissinger-Akahira-Sunose (KAS) method, and Starink method. Py-TG/MS results indicated that the RWWP could be identified as polystyrene (RWWP-1), polyethylene (RWWP-2), polyethylene terephthalate (RWWP-3, 4), and polypropylene (RWWP-5, 6). In addition, RWWP-1, 2, 5, 6 outperform RWWP-3 and 4 as sources of carbon for producing CNTs. The results showed a high carbon yield of 32.21 wt% and a high degree of CNT purity at 93.04%.

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