Concentrate and Degrade Pfoa with a Photo-Regenerable Composite of In-Doped TntsAc
“Concentrate-and-degrade” is an effective strategy to promote mass transfer and degradation of pollutants in photocatalytic systems, yet suitable and cost-effective photocatalysts are required to practice the new concept. In this study, we doped a post-transition metal of Indium (In) on a novel composite adsorptive photocatalyst, activated carbon-supported titanate nanotubes (TNTs@AC), to effectively degrade perfluorooctanoic acid (PFOA). In/TNTs@AC exhibited both excellent PFOA adsorption (100% in 30 min) and photodegradation (100% in 4 hours) under normal environmental conditions. The heterojunction structure of the composite facilitated a cooperative adsorption mode of PFOA, i.e., binding of the carboxylic head group of PFOA to the metal oxide and attachment of the hydrophobic tail to AC. The resulting side-on adsorption mode facilitates the electron (e‒) transfer from the carboxylic head to the photogenerated hole (h+), which was the major oxidant verified by scavenger tests. Furthermore, the presence of In enables direct electron transfer and facilitates the subsequent stepwise defluorination. Finally, In/TNTs@AC was amenable to repeated uses in four consecutive adsorption-photodegradation runs. The findings showed that adsorptive photocatalysts can be prepared by hybridization of carbon and photoactive semiconductors and the enabled “concentrate-and-degrade” strategy is promising for removal and degradation of trace levels PFOA from polluted waters
Year of publication: |
[2022]
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Authors: | Juve, Jan-Max Arana ; Li, Fan ; Zhu, Yangmo ; Liu, Wen ; Ottosen, Lars D.M ; Zhao, Dongye ; Wei, Zongsu |
Publisher: |
[S.l.] : SSRN |
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