Photocatalytic degradation of perfluorooctanoic acid with β-Ga2O3 in anoxic aqueous solution

Zhao, Baoxiu; Lv, Mou; Zhou, Li

doi:10.1016/s1001-0742(11)60818-8

Cited by 56 publications

(15 citation statements)

References 27 publications

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“…75 In another approach, Zhao et al proposed that ⊎-Ga 2 O 3 performed an excellent photodegradation and photodefluorination of PFOA (98.8% and 31.6%, respectively, after 3 h in reaction) in the presence of thiosulfate and bubbling nitrogen (N 2 ). 76 Nonetheless, Lopes da Silva et al reported that TiO 2 performed a higher degradation rate than Ga 2 O 3 that was not expected. 62 Fig.…”

Section: Doping With the Metal Nanoparticlesmentioning

confidence: 90%

Tailoring photocatalysts and elucidating mechanisms of photocatalytic degradation of perfluorocarboxylic acids (PFCAs) in water: a comparative overview

Thi

Nguyen

et al. 2020

J of Chemical Tech & Biotech

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A perfluorooctanoic acid (PFOA), as the most important representative of perfluorocarboxylic acids (PFCAs), is environmentally persistent and bioaccumulative. Among treatment techniques for PFOA decomposition, photocatalytic degradation of PFOA has received considerable attention. A series of candidate photocatalytic materials, including TiO2‐, carbonaceous‐, Ga2O3‐, In2O3‐based, etc., have been successfully proposed to eliminate PFOA. Overall, there are two types of mechanisms for photocatalytic degradation of PFCAs, including conventional mechanism and charge transfer mechanism. For a conventional mechanism, the mechanism of PFOA photodegradation over bulk TiO2 via two pathways: photo‐redox and β‐scission. For the charge transfer mechanism, the PFOA degradation pathway in water‐soluble H3PW12O40 is mainly via charge‐transfer excited complex ([PW12O40]3−*). Finally, attention on critical challenges and prospects for photodegradation of PFOA are also intensified. © 2020 Society of Chemical Industry

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Section: Doping With the Metal Nanoparticlesmentioning

confidence: 90%

Tailoring photocatalysts and elucidating mechanisms of photocatalytic degradation of perfluorocarboxylic acids (PFCAs) in water: a comparative overview

Thi

Nguyen

et al. 2020

J of Chemical Tech & Biotech

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show abstract

“…The combination of the photo active additives led to a defluorination rate of 88% after 24 h treatment. Gallium III oxide was used in two studies for the photo reductive treatment of PFOA [ 93 , 94 ]. After three hours of UV treatment, 98.8% of PFOA was degraded and the defluorination rate was 31.6% under anaerobic conditions.…”

Section: State-of-the-art Liquid Reactionsmentioning

confidence: 99%

Reductive Defluorination and Mechanochemical Decomposition of Per- and Polyfluoroalkyl Substances (PFASs): From Present Knowledge to Future Remediation Concepts

Roesch

Vogel

Simon

2020

IJERPH

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Over the past two decades, per- and polyfluoroalkyl substances (PFASs) have emerged as worldwide environmental contaminants, calling out for sophisticated treatment, decomposition and remediation strategies. In order to mineralize PFAS pollutants, the incineration of contaminated material is a state-of-the-art process, but more cost-effective and sustainable technologies are inevitable for the future. Within this review, various methods for the reductive defluorination of PFASs were inspected. In addition to this, the role of mechanochemistry is highlighted with regard to its major potential in reductive defluorination reactions and degradation of pollutants. In order to get a comprehensive understanding of the involved reactions, their mechanistic pathways are pointed out. Comparisons between existing PFAS decomposition reactions and reductive approaches are discussed in detail, regarding their applicability in possible remediation processes. This article provides a solid overview of the most recent research methods and offers guidelines for future research directions.

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“…The cleavage of the C-F bond has proven rather difficult even in cases where the metal oxide was TiO 2 . By contrast, the environment-unfriendly perfluorooctanoic acid (PFOA) with several such C-F bonds could be degraded in the presence of gallium sesquioxide (β-Ga 2 O 3 ) upon 254-nm irradiation, even under an inert nitrogen atmosphere [13]. In fact, several studies have demonstrated that Ga 2 O 3 is more photoactive toward the decomposition of PFOA than is TiO 2 [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Ga<sub>2</sub>O<sub>3</sub>-Photoassisted and Photolytic Degradation of the Flubendiamide Agrochemical in Aqueous Media under UVC Irradiation

Tsukamoto

Mitsutsuka

Takamura

2019

J. of Wat. & Envir. Tech.

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The photoassisted degradation of the recalcitrant and persistent Flubendiamide insecticide was examined in the presence of the metal-oxide semiconductor Ga 2 O 3 in air-equilibrated and inert conditions (Ga 2 O 3 /air and Ga 2 O 3 /N 2 , respectively) under Ultraviolet C (UVC) irradiation at 254 nm; for comparison, the degradation of this insecticide was also investigated in catalyst-free/air and catalyst-free/N 2 under UVC irradiation. The time course of the degradation was monitored by examining the yields of inorganic ions formed (fluoride, iodide, sulfate, nitrate and ammonium ions) and analyzed quantitatively by ion chromatographic techniques. Mechanistic considerations are described from calculating partial charges and electron densities on each of the functionalities in the Flubendiamide structure in aqueous media. Reactive oxygen species, such as the electrophilic •OH radicals and singlet oxygen, are inferred to attack the insecticide at positions where the functional groups possess the highest electron densities and highest negative partial charges, which led ultimately to defluorination, deiodination, desulfonation, and denitrogenation (i.e., formation of ammonium and nitrate ions). The total yields of decomposition followed expectations in the increasing order: N 2 < Ga 2 O 3 /N 2 < air < Ga 2 O 3 /air.

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Photocatalytic degradation of perfluorooctanoic acid with β-Ga2O3 in anoxic aqueous solution

Cited by 56 publications

References 27 publications

Tailoring photocatalysts and elucidating mechanisms of photocatalytic degradation of perfluorocarboxylic acids (PFCAs) in water: a comparative overview

Tailoring photocatalysts and elucidating mechanisms of photocatalytic degradation of perfluorocarboxylic acids (PFCAs) in water: a comparative overview

Reductive Defluorination and Mechanochemical Decomposition of Per- and Polyfluoroalkyl Substances (PFASs): From Present Knowledge to Future Remediation Concepts

Ga<sub>2</sub>O<sub>3</sub>-Photoassisted and Photolytic Degradation of the Flubendiamide Agrochemical in Aqueous Media under UVC Irradiation

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