{"id":51191,"date":"2024-09-16T11:50:14","date_gmt":"2024-09-16T10:50:14","guid":{"rendered":"https:\/\/www.innovationnewsnetwork.com\/?p=51191"},"modified":"2024-09-16T11:50:14","modified_gmt":"2024-09-16T10:50:14","slug":"eth-zurich-pioneer-new-method-to-combat-pfas-chemicals","status":"publish","type":"post","link":"https:\/\/www.innovationnewsnetwork.com\/eth-zurich-pioneer-new-method-to-combat-pfas-chemicals\/51191\/","title":{"rendered":"ETH Zurich pioneer new method to combat PFAS chemicals"},"content":{"rendered":"

PFAS chemicals, or per- and polyfluoroalkyl substances, are widely used in products ranging from firefighting foam<\/a> and non-stick cookware to water-repellent textiles and pesticides.<\/h2>\n

These human-made compounds are notorious for their persistence in the environment, earning the nickname ‘forever chemicals’ because they don’t naturally break down.<\/p>\n

As a result, PFAS chemicals have become a global pollutant, contaminating soil, water, and even the bodies of humans and animals. The health risks associated with PFAS are severe, including liver damage, hormonal imbalances, and cancer.<\/p>\n

To combat this issue, researchers at ETH Zurich have developed a new method for degrading a particularly harmful subgroup of PFAS known as perfluorooctane sulfonates (PFOS).<\/p>\n

This innovative approach could pave the way for safer, more effective ways to tackle PFAS pollution.<\/a><\/p>\n

The challenge of breaking down PFOS<\/h3>\n

PFOS, one of the most toxic types of PFAS, has already been restricted or banned in many parts of the world.<\/p>\n

However, its chemical structure, consisting of long carbon chains surrounded by fluorine atoms, makes it incredibly resistant to decomposition.<\/p>\n

“The main problem is that the molecules consist of long carbon chains surrounded by fluorine atoms. This carbon-fluorine bond is so strong that you need a lot of energy to break it,” explains Andrea Veciana, a doctoral student at ETH Zurich’s Institute of Robotics and Intelligent Systems.<\/p>\n

Current methods of PFAS removal, such as thermal decomposition and photocatalysis, come with significant drawbacks.<\/p>\n

Thermal decomposition demands temperatures over 1,000 degrees Celsius, making it highly energy-intensive.<\/p>\n

Photocatalysis, while effective, struggles to penetrate the cloudy wastewater where PFAS often accumulates.<\/p>\n

In addition, absorption methods, which use sponges to soak up pollutants, merely shift the contamination problem elsewhere.<\/p>\n

Piezocatalysis: A new way to degrade PFOS<\/h3>\n

ETH Zurich’s researchers have developed a novel method to break down PFOS using piezocatalysis.<\/a><\/p>\n

The process involves using nanomaterials that are piezoelectric, meaning they generate an electrical charge when mechanically deformed.<\/p>\n

By creating this electrical charge, the nanoparticles initiate a chain reaction that degrades the PFOS molecules.<\/p>\n

Working with analytical specialists, the team demonstrated that their method was able to break down 90.5% of PFOS in a controlled laboratory setting.<\/p>\n

However, the researchers note that they were working with a higher concentration of PFOS than is typically found in the environment.<\/p>\n

Advantages over existing methods<\/h3>\n

This new piezocatalysis method has several advantages over traditional techniques. One significant benefit is that it can utilise different sources of mechanical energy, making it more versatile.<\/p>\n

For example, the turbulence in wastewater treatment plants could be harnessed to activate the piezoelectric nanoparticles and degrade PFAS chemicals.<\/p>\n

Compared to the energy-intensive thermal decomposition and the limited light penetration of photocatalysis, piezocatalysis offers a more practical and energy-efficient alternative.<\/p>\n

Additionally, unlike absorption methods, piezocatalysis doesn’t just transfer the problem from water to another medium but directly breaks down the toxic chemicals.<\/p>\n

A step forward in the fight against PFAS<\/h3>\n

While the laboratory results are promising, scaling up this technology to treat large volumes of water remains a significant challenge.<\/p>\n

Nevertheless, the researchers are optimistic about the potential for piezocatalysis to be applied in various settings, from industrial wastewater treatment plants to agricultural water systems.<\/p>\n

Furthermore, the ETH Zurich team believes their method could be adapted to degrade other types of PFAS and micropollutants, broadening its potential impact.<\/p>\n

However, as Veciana points out, technological advancements alone won’t solve the PFAS problem: “PFAS is a global problem that should be tackled first and foremost through policy change and more transparency.”<\/p>\n

The development of piezocatalysis marks an exciting step forward in the fight against PFAS chemicals.<\/p>\n

While there is still work to be done to bring this technology to industrial and environmental applications, the method offers a more efficient and potentially scalable solution to a pressing global issue.<\/p>\n","protected":false},"excerpt":{"rendered":"

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