Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals

Abstract Electrochemical advanced oxidative processes (EAOP) are a promising route to destroy recalcitrant organic contaminants such as per- and polyfluoroalkyl substances (PFAS) in drinking water. Central to EAOP are catalysis-induced reactive free radicals for breaking the carbon fluorine bonds in...

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Autores principales:	Jesse S. Ko, Nam Q. Le, Danielle R. Schlesinger, James K. Johnson, Zhiyong Xia
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/51935b3ead7e4ebc8c34d5204d5cde37
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spelling	oai:doaj.org-article:51935b3ead7e4ebc8c34d5204d5cde372021-12-02T17:41:18ZNovel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals10.1038/s41598-021-97596-72045-2322https://doaj.org/article/51935b3ead7e4ebc8c34d5204d5cde372021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97596-7https://doaj.org/toc/2045-2322Abstract Electrochemical advanced oxidative processes (EAOP) are a promising route to destroy recalcitrant organic contaminants such as per- and polyfluoroalkyl substances (PFAS) in drinking water. Central to EAOP are catalysis-induced reactive free radicals for breaking the carbon fluorine bonds in PFAS. Generating these reactive species electrochemically at electrodes provides an advantage over other oxidation processes that rely on chemicals or other harsh conditions. Herein, we report on the performance of niobium (Nb) doped rutile titanium oxide (TiO2) as a novel EAOP catalytic material, combining theoretical modeling with experimental synthesis and characterization. Calculations based on density functional theory are used to predict the overpotential for oxygen evolution at these candidate electrodes, which must be high in order to oxidize PFAS. The results indicate a non-monotonic trend in which Nb doping below 6.25 at.% is expected to reduce performance relative to TiO2, while higher concentrations up to 12.5 at.% lead to increased performance, approaching that of state-of-the-art Magnéli Ti4O7. TiO2 samples were synthesized with Nb doping concentration at 10 at.%, heat treated at temperatures from 800 to 1100 °C, and found to exhibit high oxidative stability and high generation of reactive oxygen free radical species. The capability of Nb-doped TiO2 to destroy two common species of PFAS in challenge water was tested, and moderate reduction by ~ 30% was observed, comparable to that of Ti4O7 using a simple three-electrode configuration. We conclude that Nb-doped TiO2 is a promising alternative EAOP catalytic material with increased activity towards generating reactive oxygen species and warrants further development for electrochemically destroying PFAS contaminants.Jesse S. KoNam Q. LeDanielle R. SchlesingerJames K. JohnsonZhiyong XiaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-11 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jesse S. Ko Nam Q. Le Danielle R. Schlesinger James K. Johnson Zhiyong Xia Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
description	Abstract Electrochemical advanced oxidative processes (EAOP) are a promising route to destroy recalcitrant organic contaminants such as per- and polyfluoroalkyl substances (PFAS) in drinking water. Central to EAOP are catalysis-induced reactive free radicals for breaking the carbon fluorine bonds in PFAS. Generating these reactive species electrochemically at electrodes provides an advantage over other oxidation processes that rely on chemicals or other harsh conditions. Herein, we report on the performance of niobium (Nb) doped rutile titanium oxide (TiO2) as a novel EAOP catalytic material, combining theoretical modeling with experimental synthesis and characterization. Calculations based on density functional theory are used to predict the overpotential for oxygen evolution at these candidate electrodes, which must be high in order to oxidize PFAS. The results indicate a non-monotonic trend in which Nb doping below 6.25 at.% is expected to reduce performance relative to TiO2, while higher concentrations up to 12.5 at.% lead to increased performance, approaching that of state-of-the-art Magnéli Ti4O7. TiO2 samples were synthesized with Nb doping concentration at 10 at.%, heat treated at temperatures from 800 to 1100 °C, and found to exhibit high oxidative stability and high generation of reactive oxygen free radical species. The capability of Nb-doped TiO2 to destroy two common species of PFAS in challenge water was tested, and moderate reduction by ~ 30% was observed, comparable to that of Ti4O7 using a simple three-electrode configuration. We conclude that Nb-doped TiO2 is a promising alternative EAOP catalytic material with increased activity towards generating reactive oxygen species and warrants further development for electrochemically destroying PFAS contaminants.
format	article
author	Jesse S. Ko Nam Q. Le Danielle R. Schlesinger James K. Johnson Zhiyong Xia
author_facet	Jesse S. Ko Nam Q. Le Danielle R. Schlesinger James K. Johnson Zhiyong Xia
author_sort	Jesse S. Ko
title	Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
title_short	Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
title_full	Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
title_fullStr	Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
title_full_unstemmed	Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
title_sort	novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/51935b3ead7e4ebc8c34d5204d5cde37
work_keys_str_mv	AT jessesko novelniobiumdopedtitaniumoxidetowardselectrochemicaldestructionofforeverchemicals AT namqle novelniobiumdopedtitaniumoxidetowardselectrochemicaldestructionofforeverchemicals AT daniellerschlesinger novelniobiumdopedtitaniumoxidetowardselectrochemicaldestructionofforeverchemicals AT jameskjohnson novelniobiumdopedtitaniumoxidetowardselectrochemicaldestructionofforeverchemicals AT zhiyongxia novelniobiumdopedtitaniumoxidetowardselectrochemicaldestructionofforeverchemicals
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Novel niobium-doped titanium oxide towards electrochemical destruction of forever chemicals

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