Photocatalytic decomposition of perfluorooctanoic acid by transition-metal modified titanium dioxide

Chen, Mengjia; Lo, Shang‐Lien; Lee, Yu‐Chi; Huang, Chang-Chieh

doi:10.1016/j.jhazmat.2015.02.004

Cited by 138 publications

(44 citation statements)

References 43 publications

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“…TFA (CF3COOH) was not detected because the concentration was too low. According to these results and reports in many literatures [5][6][7]9], PFOA degradation is mediated predominantly through the action of holes generated on the TiO 2 surface. PFOA as anionic compound was absorbed on the MIPAg/TiO 2 surface.…”

Section: Pfoa Decomposition Mechanismssupporting

confidence: 73%

“…Furthermore, negatively charged surface was formed after PFOA (C7F15COO−) was adsorbed on the surface of the MIP-Ag/TiO 2 NTs or MIP-TiO 2 NTs. When the TiO 2 was excited under UV irradiation, electrostatic attraction between this negatively charge and the catalyst surface would have retarded charge recombination and promote surface reactions with valence band holes (h+) [7]. Therefore, the NIP-Ag/TiO 2 NTs exhibited weaker capacity compared with that of the MIP-Ag/TiO 2 NTs.…”

Section: Degradation Kineticsmentioning

confidence: 99%

“…TiO 2 photocatalysis is shown to be an effective process without harmful byproducts due to its capability in the removal of a wide range of pollutants, and coupled with other advantages in terms of high photochemical stability, environmentally friendly, and low cost [5]. It have been reported that TiO 2 and its modified catalyst-mediated heterogeneous photocatalysis was applied to remove the PFCs, while a considerable amount of pollutant was degraded [5][6][7]. However, high recombination rate of photo-induced electron-hole pairs formed, catalyst separation and reuse are also intrinsic and significant obstacles for practical applications of TiO 2 powder in heterogeneous photocatalysis.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Tian¹,

Wu²,

Mao³

2017

AIP Conference Proceedings

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Section: Pfoa Decomposition Mechanismssupporting

confidence: 73%

Section: Degradation Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Tian¹,

Wu²,

Mao³

2017

AIP Conference Proceedings

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“…Furthermore, negatively charged surface was formed after PFOA (C 7 F 15 COO − ) was adsorbed on the surface of the MIP-TiO 2 NTs. When the titanium dioxide was excited under UV irradiation, electrostatic attraction between this negatively charged and the catalyst surface would have retarded charge recombination and promote surface reactions with valence band holes (h + ), which are advantageous in PFOA decomposition and defluorination [9,24].…”

Section: Degradation Kineticsmentioning

confidence: 99%

“…Footprint cavities generated on the surface of the MIP-TiO 2 NTs may have inhibited the competitive adsorption between PFOA and organic matter. Furthermore, PFOA was preferentially adsorbed to the surface of MIP-TiO 2 NTs and was ionized to anionic PFOA (C 7 F 15 COO − ) because the initial pH of the solution was 5 [9,24]. Thus, to a certain extent, the negatively charged surface formed on the MIPTiO 2 NTs would have produced a repulsion that decreased the scavenging of hydroxyl and other oxidizing radical species.…”

Section: Degradation In Secondary Effluentmentioning

confidence: 99%

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays

Tian

et al. 2016

International Journal of Photoenergy

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Perfluorinated chemicals have attracted worldwide concern owing to their wide occurrence and resistance to most conventional treatment processes. In this work, a novel photocatalyst was fabricated by modifying TiO 2 nanotube arrays with molecularly imprinted polymers. The molecularly imprinted polymer-modified TiO 2 nanotubes (MIP-TiO 2 NTs) were characterized and tested for the selective removal of perfluorooctanoic acid (PFOA) from water. The amount of PFOA adsorbed by the MIP-TiO 2 NTs was as high as 0.8125 g/cm 2 . PFOA decomposition and defluorination by the MIP-TiO 2 NTs reached 84% and 30.2% after 8 h reaction, respectively. The Freundlich model and pseudo-first-order kinetics were used to describe the observed adsorption and decomposition of PFOA, respectively. Compared with TiO 2 NTs and nonmolecularly imprinted polymer-modified TiO 2 NTs, the MIP-TiO 2 NTs exhibited not only a higher PFOA degradation rate but also enhanced selectivity for target chemicals. The MIP-TiO 2 NTs could also selectively and rapidly remove PFOA from secondary effluent, exhibiting a decomposition of 81.1%, almost as high as that observed in pure water. Investigation of the effects of scavengers on the photocatalytic reaction indicated that photogenerated holes were the main oxidant for PFOA decomposition, and the PFOA degradation mechanism and pathway were proposed.

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Aqueous‐Phase Photocatalytic Degradation of Emerging Forever Chemical Contaminants

Kuhn

Sokefun

2021

ChemistrySelect

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Heterogeneous photocatalysis is an emerging area of catalysis increasingly fraught with pains caused by the battle between hype and real-world application. Inspired by abundant yet diffuse solar energy and applications such as clean water and energy, ample motivation has provided the background for this situation. However, substantial fundamental (e. g., charge transfer, recombination), engineering (e. g., observed rates, photon management), and practical barriers (e. g., use of precious metals, competing technologies) have limited implementation. In this review, these are all outlined, in conjunction with typical strategies for improvements, with an emphasis on the use of semiconductor photocatalysts for the degradation of emerging forever chemical contaminants in water. The selected classes of forever chemical contaminants are (micro)-plastics, per-and polyfluoroalkyl substances (PFAs), siloxanes, and dioxanes. Each has been identified as a key or emerging contaminant and often travel widely while accumulating in the atmosphere due to the lack of natural remediation processes. Recommendations to the field and opportunities for contributions are highlighted throughout and as part of the outlook to the future.

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Photocatalytic decomposition of perfluorooctanoic acid by transition-metal modified titanium dioxide

Cited by 138 publications

References 43 publications

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays

Aqueous‐Phase Photocatalytic Degradation of Emerging Forever Chemical Contaminants

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Photocatalytic decomposition of perfluorooctanoic acid by transition-metal modified titanium dioxide

Cited by 138 publications

References 43 publications

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Enhanced performance of surface modified TiO2 nanotubes for the decomposition of perfluorooctanoic acid

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO2Nanotube Arrays

Aqueous‐Phase Photocatalytic Degradation of Emerging Forever Chemical Contaminants

Contact Info

Product

Resources

About

Selective Removal of Perfluorooctanoic Acid Using Molecularly Imprinted Polymer-Modified TiO₂Nanotube Arrays