What the study found
The study found that 5,10,15,20-tetraphenyl (4-aminophenyl) porphyrin, or TAPP, aggregates can act as visible-light-driven photocatalysts and achieve almost complete defluorination of per- and polyfluoroalkyl substances (PFASs), a group of persistent fluorinated chemicals. The authors report that this works without chemical additives.
Why the authors say this matters
The authors say the environmental persistence of PFASs makes remediation difficult because of the stability of their carbon-fluorine bonds. They conclude that their steady radical strategy, which uses charge delocalization to engineer strongly reducing photocatalysts, offers an approach to address persistent environmental contaminants.
What the researchers tested
The researchers tested TAPP aggregates as photocatalysts under visible light in water. They examined the role of an ultra-stable TAPP radical species, called TAPP•, and how it generates highly reductive electrons under irradiation.
What worked and what didn't
Under visible-light irradiation, TAPP• generated electrons with a reported potential of −2.68 V versus NHE, which the authors say was sufficient to inject into carbon-fluorine antibonding orbitals and start defluorination. The abstract says the system achieved almost-100% defluorination of PFASs and did so without chemical additives.
What to keep in mind
The available summary does not provide detailed experimental conditions, PFAS types tested, or quantitative comparison with other remediation methods. It also does not describe any limitations beyond the need to rely on visible-light-driven photocatalysis in water.
Key points
- TAPP aggregates were reported as visible-light-driven photocatalysts for PFAS defluorination.
- The abstract says PFAS defluorination was almost complete and occurred without chemical additives.
- The key reactive species was an ultra-stable TAPP radical, TAPP•, with a lifetime exceeding 7 days under ambient conditions.
- The authors report a reductive electron potential of −2.68 V versus NHE.
- The study attributes the radical’s stability to intramolecular charge delocalization involving amino-group lone-pair electrons and the highest occupied molecular orbital.
Disclosure
- Research title:
- Visible-light TAPP aggregates achieved near-complete PFAS defluorination
- Authors:
- MeiChi Chong, Qixin Zhou, Jiayi Xu, Zhaohui Wu, Enwei Zhu, Wenlu Li, Ling Zhang, Yan Guo, Yongfa Zhu
- Institutions:
- Hong Kong Virtual University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, Tsinghua University, University of Hong Kong
- Publication date:
- 2026-02-23
- OpenAlex record:
- View
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