Researchers report that sunlight can drive a reaction between discarded polystyrene and elemental sulfur to produce useful organic compounds. In experiments described by Chemistry World, exposure lasted as little as two minutes under ambient conditions. The result is a promising laboratory process, not a demonstrated commercial-scale recycling method: selectivity, yield and separation remain significant challenges.
What does the sunlight-driven process make?
The study by Y. Liu and colleagues, led by Qing-An Chen at the Dalian Institute of Chemical Physics, was reported by Chemistry World on March 12, 2026. The paper appeared in the Journal of the American Chemical Society (DOI: 10.1021/jacs.6c01318).
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Among the reported products are a diphenylated thiophene, a type of compound useful in semiconductor materials, and 1,3,5-triphenylbenzene, an organic building block. Chemistry World says the latter can cost up to $400 (£300) per kilogram; that is market-price context reported in the article, not a verified current quote or a valuation of material made by this process.
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The report says the chemical industry produces more than 20 million tonnes of polystyrene annually and less than 1% is recycled each year. Those figures are attributed to Chemistry World’s 2026 report, rather than presented as statistics independently verified against an industry dataset.
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How do sulfur and sunlight drive the reaction?
The reported process combines polystyrene with elemental sulfur and exposes the mixture to sunlight. Chemistry World says the researchers obtained products after as little as two minutes of exposure under ambient conditions. That is a reported experimental exposure time, not evidence that every batch or feedstock can be converted in two minutes.
According to the mechanistic studies as described by Chemistry World, sunlight generates sulfur radicals. These abstract hydrogen atoms from the polystyrene backbone. Hydrated sulfur radicals then react with polymer-derived material through several steps to form the final compounds. The sulfur is therefore a reactive ingredient in the chemical transformation, rather than merely a material mixed into the waste.
Which waste materials were tested?
The researchers reportedly tested post-consumer polystyrene items including spoons, cups, food packaging, falcon tubes and assay plates. This shows that several forms of polystyrene waste were examined, but does not establish that the process works on all polystyrene products, contaminated feedstock or mixed plastics.
What still limits the process?
Selectivity and yield
The reaction does not produce 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 depolymerize polystyrene further or as a UV-blocking additive in polystyrene films.
The report identifies selectivity and yield as major challenges. Polymer chemist Andrew Dove of the University of Birmingham told Chemistry World, “The selectivity and yield are some of the biggest challenges for this work.” The accessible report does not establish detailed isolated yields or complete product distributions.
Separating the products
A mixture containing valuable target compounds and degraded polymer still needs a practical route to separate its contents. Dove cautioned that “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 report does not provide enough detail to assess the process’s separation requirements or energy accounting.
Scale and environmental performance
The reported experiments do not establish commercial-scale production, process economics or a full environmental assessment. Sunlight is the stated energy input for the reported reaction, but that alone does not show the overall process is environmentally beneficial; the available account does not quantify other energy needs or the burdens of handling and separating products.
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Chen described the approach as a way to combine excess elemental sulfur with non-degradable polystyrene waste and use solar energy. That is the researcher’s stated rationale, not independent proof of the process’s environmental benefits. Chen also said the team aims to extend the method to polyethylene, polypropylene and polyvinyl chloride. These are future goals; the reported work does not demonstrate conversion of those plastics.
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