Innovation Signal 71 (2026) | 2 November 2026
Difficult PFAS are becoming easier to break down under milder conditions
Short note, about 5 minutes to read.
What happened
PFAS (per- and polyfluoroalkyl substances) are a large group of synthetic chemicals whose resistance to heat, water, oil and chemical reactions has made them useful in many industrial and consumer applications.
Those same properties create a problem. Many PFAS break down extremely slowly in the environment, which is why they are often called “forever chemicals”.
Removing PFAS from contaminated water is possible. Destroying them is much harder.
Destroying PFAS is not new. High-temperature and other harsh treatment methods already exist and researchers have explored light-driven approaches for years.
Harsh destruction methods → photochemical treatment → deeper breakdown under milder conditions
PFAS contain exceptionally strong carbon-fluorine bonds. Removing fluorine by breaking those bonds (defluorination) is one way researchers can measure how deeply the chemicals are being broken down.
In 2024, researchers at Ritsumeikan University used visible light and semiconductor nanocrystals to break down PFOS, one type of PFAS, under ambient conditions. In their experiments, PFOS was completely defluorinated within eight hours.
More recently, researchers led by Yongfa Zhu and colleagues demonstrated another approach that used visible light to attack the strong carbon-fluorine bonds in PFAS. They reported almost complete defluorination without chemical additives.
Together, the studies show that deep breakdown of difficult PFAS is being demonstrated through a widening range of treatment routes under milder conditions.
Why this matters
Capturing PFAS from contaminated water does not destroy them. It can leave the chemicals concentrated in another material or waste stream that still needs to be treated, stored or disposed of safely.
If destruction can eventually work under less extreme conditions, PFAS treatment could increasingly move beyond removing persistent chemicals from water towards breaking them down.
Who should care
- Water and wastewater utilities
- Environmental remediation companies
- Industrial water-treatment companies
- Chemical and advanced-materials companies
- Environmental regulators and public authorities
- Investors tracking water and environmental technologies
What could change over the next 2 to 3 years
Watch for these approaches moving into larger reactors and more complex contaminated water while maintaining high levels of PFAS breakdown.
Treatment time, energy requirements, catalyst durability and cost will become increasingly important measures of whether the approaches can move beyond laboratory experiments.
What might block this
Different PFAS compounds may respond differently, substances in real contaminated water could interfere with treatment and laboratory systems may prove difficult or expensive to scale.
The results therefore do not yet show that these approaches can destroy PFAS economically or reliably in practical water-treatment systems.
Why I am sharing this
The persistence that made PFAS useful is also what makes dealing with them so difficult once they enter the environment.
The next advance in PFAS treatment may be not just removing these persistent chemicals from water, but making them easier to destroy.
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Archive Tags
PFAS · Water Treatment · Environmental Remediation · PFAS Destruction