Scientists Find a New Way to Turn Plastic Trash Into Useful Chemicals

Plastic waste is a huge problem around the world. In 2019 alone, the world produced 353 million tonnes of plastic waste, and nearly half of it ended up in landfills. If nothing changes, scientists predict that up to 12 billion tonnes of plastic could pile up in landfills or spill into the environment by 2050.

Most recycling methods today require special chemicals called catalysts to help break plastic down. The problem is that real-world plastic trash is full of dyes, stabilizers, and other additives that can damage or poison these catalysts over time. That makes large-scale recycling expensive and difficult.

The new method works differently. Researchers mixed small amounts of plastic with water inside a sealed container, then added oxygen gas under mild pressure and gentle heat — around 125 degrees Celsius. When the mixture was stirred, the melted plastic broke into tiny droplets surrounded by water, and at the surfaces of those droplets, the water naturally produced highly reactive particles called hydroxyl radicals.

Hydroxyl radicals act like tiny chemical scissors that cut apart the long chains that make up plastic molecules. The radicals attacked the chemical bonds inside the plastic and broke them into shorter pieces. Those pieces then reacted with oxygen to form useful chemicals called diacids, which are used to make medicines, food additives, and other products.

The researchers tested the method on many types of plastic, including grocery bags, bottle caps, rubber tires, and multi-layer packaging films. In almost every case, the plastic was fully broken down. The process also worked with messy, mixed plastic waste — the kind that is hardest to recycle.

One exciting part of the experiment involved making the process bigger. The team successfully ran the reaction using 300 grams of plastic at once, and it still worked well. In that larger test, 89 percent of the plastic was converted, and more than half turned into useful diacid chemicals.

The scientists also checked whether the method was good for the environment. Unlike burning plastic, this process acts as a carbon sink, meaning it removes more greenhouse gases than it produces. It also uses less energy than older recycling methods.

A cost analysis showed that a factory using this method could pay back its startup costs in about 3.3 years. The process only needs water and oxygen, which are easy to find almost anywhere — even seawater worked in experiments. This makes the method especially useful for remote places like islands.

Scientists are excited because this discovery could change the way the world handles plastic pollution. Instead of plastic piling up in landfills or washing into the ocean, it could be turned into valuable chemicals that people need every day. Researchers hope engineers will soon build real factories using this process to help clean up the planet.