A team of scientists is exploring a method to convert plastic waste into fuels and valuable chemicals using sunlight.
Worldwide, more than 500 million tons of plastic per yearand millions of tons end up in the environment. At the same time, growing pressure to reduce the use of fossil fuels has intensified the search for more sustainable energy alternatives.
According to , scientists are developing a potential solution to two major global problems: plastic pollution and the demand for energy, using sunlight to transform discarded plastics into useful fuels.
In a new one, published this Tuesday in Chem Catalysisthe team of researchers examined how solar-powered systems can convert plastic waste into hydrogen, syngas and other industrial chemicals. This approach could support the transition to a more sustainable circular economy.
“If we can efficiently convert plastic waste into clean fuels using sunlight, we can address pollution and energy challenges at the same time,” explained the study’s first author, Xiaolu.
This method, called photoreform powered by solar energyis based on light-sensitive materials known as photocatalyststo decompose plastics at relatively low temperatures.
The process can generate hydrogen, a clean fuel that produces no emissions at the point of use, along with other useful industrial chemicals.
Compared to conventional hydrogen production through water dissociation, this approach requires less energysince plastics are easier to oxidize. This advantage could make it more practical for large-scale use.
Scientists have achieved high hydrogen production, along with the production of acetic acid e diesel-type hydrocarbons. Some systems operated continuously for more than 100 hoursdemonstrating an improvement in stability and efficiency.
Despite these advances, several obstacles remain before the technology can be used.
“One of the main obstacles is the complexity of plastic waste. Different types of plastic behave differently during conversion, and additives such as dyes and stabilizers can interfere with the process. Therefore, screening and pre-treatment are essential to maximize product performance and quality”, added the study’s lead author, Xiaoguang Duan.
Designing better photocatalysts constitutes another challenge. These materials have to be highly selective and durable so that they can function in harsh chemical conditions without losing efficiency. Current systems may degrade over time, limiting long-term use.
Separation of final products remains difficult. The process often produces a mixture of gases and liquids that require energy-intensive purification, which can reduce overall sustainability.
To overcome these issues, the researchers suggest a more integrated strategy that combines advances in catalyst design, reactor engineering and system optimization.
New ideas include continuous flow reactors, systems that combine solar energy with heat or electricity, and improved monitoring to increase efficiency.
Finally, the team also charted a path for expanding the technology, with objectives such as greater energy efficiency and continuous operation in the coming years.
