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A study reported in March 2026 describes a sunlight-driven reaction that turns polystyrene waste and elemental sulfur into organic compounds, including a diphenylated thiophene and 1,3,5-triphenylbenzene. The researchers reported that the reaction worked after as little as two minutes of sunlight exposure under ambient conditions. It is a promising chemical upcycling result, not yet evidence of a scalable recycling process: selectivity, yield and separation remain major challenges.
What does the process make?
Y. Liu and colleagues, in work led by Qing-An Chen at the Dalian Institute of Chemical Physics, reported the process in the Journal of the American Chemical Society (2026; DOI: 10.1021/jacs.6c01318). Chemistry World’s March 12, 2026 report describes sunlight-driven reactions between polystyrene and elemental sulfur that produce several organic compounds. Chemistry World’s report identifies a diphenylated thiophene, a type of compound useful in semiconductor materials, and 1,3,5-triphenylbenzene, a versatile organic building block, among the products.
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The report says 1,3,5-triphenylbenzene can cost up to $400 (£300) per kilogram. That is market-price context cited by Chemistry World, not a verified current quote or a valuation of material produced by this reaction.
How does sunlight and sulfur drive the reaction?
According to the researchers’ proposed mechanism as described by Chemistry World, sunlight generates sulfur radicals. These radicals remove hydrogen atoms from the polystyrene backbone; hydrated sulfur radicals then react with polymer-derived material through several steps to form the final compounds. The report describes exposure durations as short as two minutes under ambient conditions, but that figure is a reported experimental condition—not a guarantee of performance across different feedstocks or operating setups.
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Which waste materials were tested?
The researchers reportedly tested post-consumer polystyrene items including spoons, cups, food packaging, falcon tubes and assay plates. That shows the process was tried with several forms of polystyrene waste. It does not establish that every kind of polystyrene, contaminated material or mixed-plastic waste will work.
The scale of the waste problem helps explain the interest in alternatives. Chemistry World reports that the chemical industry produces over 20 million tonnes of polystyrene annually and that less than 1% is recycled each year. Those figures are reported by the publication; they are not presented here as statistics independently verified against an industry dataset.
What are the main limitations?
Selectivity and yield
The reaction produces a mixture rather than only the desired compounds. Chemistry World reports that partially degraded polystyrene made up as much as around 40% by weight of the final reaction mixture. The researchers reportedly found that this fraction could be used to further depolymerize polystyrene or as a UV-blocking additive in polystyrene films, but that does not eliminate the challenge of making and recovering target products efficiently.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsAndrew Dove, a polymer chemist at the University of Birmingham, told Chemistry World: “The selectivity and yield are some of the biggest challenges for this work.” The report does not provide detailed isolated yields or a complete product distribution, so the amount of each recoverable target compound cannot be assessed from those figures alone.
Separation and practical scale
A product mixture generally has to be separated if the goal is to sell or use individual chemicals. Dove also told Chemistry World: “Separation is usually energy intensive or not done very sustainably… so getting [the selectivity] better to be able to avoid separation would be an important target.” The accessible report does not establish the process’s separation requirements, energy accounting, economics or commercial-scale performance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is this a recycling process ready for use?
Not on the evidence reported. The study is a laboratory research result showing a route to convert tested polystyrene items into potentially useful molecules. A two-minute sunlight exposure and tests on several post-consumer objects are encouraging, but they do not demonstrate an industrial process, a commercial product supply or environmental benefits across a full lifecycle.
Chen said the approach combines “elemental sulfur in excess supply with non-degradable polystyrene waste” and uses “clean solar energy.” These are the researcher’s stated rationale for the work; the report does not supply a lifecycle assessment establishing net environmental impacts. Chen also said the team aims to extend the method to polyethylene, polypropylene and polyvinyl chloride. Those are future research goals, not demonstrated conversions of those plastics.
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