In a recent review published in Communications Earth & Environment, authors Fanghua Li, Ning Wang, Xin He, Mingyue Deng, and colleagues explore the innovative use of biochar-based catalysts (BBCs) to convert plastic waste into valuable fuels. This approach not only addresses the growing problem of plastic pollution but also offers a sustainable strategy for energy production. The review assesses the effectiveness of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More catalysts in various conversion technologies, highlighting their potential to support a circular economy and mitigate environmental issues

To combat plastic waste, chemical upcycling, which uses catalysts to convert plastics into valuable fuels, has been developed. Biochar, a sustainable material derived from biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More, has emerged as a promising catalyst due to its cost-effectiveness, reusability, and ability to enhance fuel production while reducing pollution.  

The review discusses several catalytic technologies for plastic waste treatment. Biochar catalysts have shown particular promise in pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More, where they facilitate the conversion of plastic waste into liquid fuels.  

To maximize the effectiveness of biochar catalysts, various activation and modification techniques are employed. The review also explores the application of machine learning to design and optimize biochar-based catalysts. Machine learning algorithms can predict catalyst performance and identify key parameters for catalyst synthesis, accelerating the development of efficient plastic upcycling systems.  

In addition to thermochemical methods, advanced oxidation processes (AOPs) like photocatalysis and Fenton oxidation offer alternative strategies for plastic waste degradation. Biochar catalysts have demonstrated effectiveness in these systems, facilitating the breakdown of plastics under mild conditions.  

The catalytic conversion of plastic waste results in the production of valuable fuels, including liquid oil and syngasSyngas, or synthesis gas, is a fuel gas mixture consisting primarily of hydrogen and carbon monoxide. It is produced during gasification and can be used as a fuel source or as a feedstock for producing other chemicals and fuels.   More. These fuels can be used for various energy applications, offering a sustainable alternative to fossil fuels. However, further upgrading of these fuels is often necessary to improve their quality and meet specific application requirements.  

The economic viability and environmental impact of plastic waste conversion systems are critical factors for their implementation. Life cycle assessments (LCAs) are essential for evaluating the environmental footprint of these processes, while techno-economic analyses determine their economic feasibility. Biochar catalysts offer a cost-effective solution, but optimizing their production and application is crucial for widespread adoption.  

Source: Li, F., Wang, N., He, X., Deng, M., Yuan, X., Zhang, H., … & Ok, Y. S. (2025). Biochar-based catalytic upgrading of plastic waste into liquid fuels towards sustainability. Communications Earth & Environment, 6(1), 329.