Precise activation of C–C bonds for recycling and upcycling of plastics

Abstract

The critical task of activating and cleaving inert C–C bonds during plastic upcycling and recycling holds substantial importance.

Recycling and repurposing of waste carbon nanofiber polymers: a critical review

“…Finally, by adopting recycling, reusing, and remanufacturing practices, the carbon fiber industry can minimize waste generation, conserve resources, and extend product lifecycles to their fullest potential. 92 To fully harness the benefits of a circular economy in the carbon fiber industry, it is crucial to address technological limitations, manage costs, and create market demand for recycled carbon fiber products. Here are some specific strategies (Fig.…”

Analysis and removal of bisphenols in recycled plastics using polyethylene glycol

“…In this context of concern for food safety and the quality of materials in contact with food, the detection and evaluation of substances such as bisphenols in recycled plastics become critical aspects of scientific research, particularly because studies, such as the one conducted by Dreolin et al 12 have already demonstrated the presence of this compound in recycled plastics, specifically in recycled PET. Furthermore, other authors revealed that as the amount of recycled PET increases, the quantity of BPA in beverages significantly rises, highlighting concerns regarding the safety of recycled PET 1 1 , 3 4 .…”

Fabrication of Fe–Zr, Co–Zr, and Ni–Zr Catalysts to Boost CNTs Synthesis from Plastic Wastes and the Electrocatalytic Oxygen Evolution Reaction

“…Due to easy preparation, low cost, high stability, etc., polymer materials have been considered as an indispensable source for industrial and economic development. However, the increasing consumption of polymer materials inevitably leads to the accumulation of solid wastes and serious environmental pollution. , The rational recycling, reduction, and reuse of plastic wastes are crucial to the green and sustainable development and attract more and more attention. − Based on the continuous efforts of scientists and engineers, the efficient and clean disposal of plastic wastes is expected to not only alleviate the environmental crisis but also generate high-value byproducts like CNTs. − The two-stage reaction system has been designed for the conversion of plastic wastes to CNTs: (1) the upper stage promotes the pyrolysis of plastic wastes at 500–700 °C; (2) the lower stage promotes CNTs formation over catalysts at 600–800 °C. − Fe, Co, and Ni catalysts are widely used to tailor CNTs yield, quality, and morphology from plastic wastes. − Guo et al found that the Fe–Al catalyst was more capable of promoting the conversion of phenolic formaldehyde resin to CNTs and obtained a higher yield, purity, and graphitization compared to the Ni–Al catalyst. Veksha et al found that improving the surface area and reducibility of Fe–Al catalyst enhanced the conversion of polyolefins to CNTs.…”