Environmental activists clear plastic waste from Kali Tebu River in Surabaya, Indonesia, on June 20, 2026. Photo: VCG
A joint research by Chinese and worldwide scientists has developed a catalyst-free plastic degradation expertise, paving the best way for extra environment friendly recycling and high-value utilization of plastic waste, the Science and Technology Daily reported on Thursday.
Using solely water and oxygen, two of essentially the most plentiful and cheap substances on Earth, because the response medium, the analysis team effectively transformed waste polyethylene, polypropylene and discarded rubber tires into excessive value-added natural acids below gentle circumstances. The strategy overcomes the normal reliance on excessive temperatures, and sophisticated chemical reagents, providing a brand new path for high-value plastic recycling.
The joint research by the analysis team led by Wang Yong, a professor from the School of Materials Science and Engineering, Zhejiang University, in collaboration with different researchers from home and abroad universities together with Cardiff University and the University of Tokyo, was revealed within the worldwide tutorial journal Nature on Thursday.
With world plastic manufacturing exceeding 400 million tons a yr, improper disposal of plastic waste by way of landfills and incineration continues to gasoline microplastic air pollution and create long-term environmental challenges.
However, present chemical recycling applied sciences deal with solely about 9 % of plastic waste and are hindered by reliance on pricey catalysts, harsh response circumstances, excessive vitality consumption, costly processing prices and restricted large-scale implementation.
Initially, the plastic degradation analysis by Wang’s team was the identical as that of many researchers within the discipline, which is to develop extra environment friendly catalysts. However, a routine management experiment carried out by a researcher in Wang’s team unexpectedly revealed that polyethylene may degrade and not using a catalyst.
The analysis team initially suspected that the resultd may need been attributable to an experimental error or by hint quantities of residual catalyst within the reactor. After dozens of repeated experiments, researchers confirmed that plastics will be successfully degraded with none added catalyst.
The team later uncovered tiny water droplet interface because the essential issue within the mechanism behind the degradation course of. Tiny water droplets are shaped when melted plastic is stirred into water. This produces a extremely energetic “water-oil” interface, the place reactive hydroxyl radicals come up spontaneously. Those radicals then perform like molecular “scissors,” breaking the in any other case cussed polymer chains into smaller, chemically helpful fragments.
According to Wang, utilizing solely water and oxygen at temperatures above 100 C, researchers achieved full polyethylene conversion with out catalysts, leaving no microplastic residues and enabling full degradation and high-value recycling.
This discovery not solely reshapes individuals’s understanding of plastic oxidation degradation but additionally gives a brand new technological route for plastic recycling, turning low-value plastic waste, which is pricey to course of, into high-value chemical feedstocks, and changing an environmental burden right into a helpful useful resource, in line with the Science and Technology Daily report.
Global Times