@article {ARANAJUVE2022134495,
	title = {Concentrate and degrade PFOA with a photo-regenerable composite of In-doped TNTs@AC},
	journal = {Chemosphere},
	volume = {300},
	year = {2022},
	pages = {134495},
	abstract = {{\textquotedblleft}Concentrate-and-degrade{\textquotedblright} 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 (\>99\% in 30~min) and photodegradation (\>99\% in 4~h) under optimal conditions (25~{\textdegree}C, pH 7, 1~atm, 1~g/L catalyst, 0.1~mg/L PFOA, 254~nm). 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 {\textquotedblleft}concentrate-and-degrade{\textquotedblright} strategy is promising for the removal and degradation of trace levels of PFOA from polluted waters.},
	keywords = {Adsorptive photocatalyst, Concentrate-and-degrade, Electron-hole recombination, Heterojunction, Perfluorooctanoic acid},
	issn = {0045-6535},
	doi = {http://doi.org/10.1016/j.chemosphere.2022.134495},
	url = {http://www.sciencedirect.com/science/article/pii/S0045653522009882},
	author = {Jan-Max Arana Juve and Li, Fan and Yangmo Zhu and Liu, Wen and Lars D.M. Ottosen and Zhao, Dongye and Zongsu Wei}
}