Scientists have developed a new material capable of capturing the harmful chemical benzene from the polluted air, offering a potential solution for tackling a major health and environment risk.
The study, led by scientists at The University of Manchester, has revealed that a material known as a metal-organic framework (MOF) – an ultra-porous material – can be modified to capture and filter out significantly more benzene from the atmosphere than current materials in use.
Benzene is primarily used as an industrial solvent and in the production of various chemicals, plastics, and synthetic fibres, but can also be released into the atmosphere through petrol stations, exhaust fumes and cigarette smoke. Despite its widespread applications, benzene is classified as a human carcinogen, and exposure can lead to serious health effects, making careful management and regulation essential.
The research, published in the journal Nature Materials today, could lead to significant improvements in air quality both indoors and outdoors.
MOFs are advanced materials that combine metal centres and organic molecules to create porous structures. They have a highly adjustable internal structure, making them particularly promising for filtering out harmful gases from the air.
The researchers modified the MOF structure – known as MIL-125 – by incorporating single atoms from different elements, including zinc, iron, cobalt, nickel and copper to test which would most effectively capture benzene.
They discovered that adding a single zinc atom to the structure significantly enhanced the material’s efficiency, enabling it to capture benzene even at ultra-low concentrations – measured at parts per million (ppm) – a significant improvement over current materials.
The new material – now known as MIL-125-Zn – demonstrates a benzene uptake of 7.63 mmol per gram of material, which is significantly higher than previously reported materials.
It is also highly stable even when exposed to moisture, maintaining its ability to filter benzene for long periods without losing effectiveness. Tests show that it can continue removing benzene from air even under humid conditions.
