A concentrate-and-destroy technique for degradation of perfluorooctanoic acid in water using a new adsorptive photocatalyst

Li, Fan; Wei, Zongsu; He, Ke; Blaney, Lee; Cheng, Xinquan; Xu, Tianyuan; Liu, Wen; Zhao, Dongye

doi:10.1016/j.watres.2020.116219

Cited by 127 publications

(67 citation statements)

References 84 publications

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“…Combining different strategies can lead to significant advancements in photocatalytic performance by creating a synergetic effect. Fe-deposited titanate nanotubes (TNT) supported on activated carbon (AC) (Fe/TNTs@AC) demonstrated highly efficient photodegradation of PFOA (~90%) in 4 h under UV light irradiation with 62% of the defluorination reaction [69]. In Fe/TNTs@AC, the nanotube architecture and AC provided a high surface area, while α-Fe 2 O 3 particles and AC considerably boosted PFOA adsorption on the surface and separation of the h + /e − pair by acting as the electron acceptor.…”

Section: Metal Oxidesmentioning

confidence: 99%

Light-Induced Advanced Oxidation Processes as PFAS Remediation Methods: A Review

et al. 2021

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PFAS substances, which have been under investigation in recent years, are certainly some of the most critical emerging contaminants. Their presence in drinking water, correlated with diseases, is consistently being confirmed by scientific studies in the academic and health sectors. With the aim of developing new technologies to mitigate the water contamination problem, research activity based on advanced oxidation processes for PFAS dealkylation and subsequent mineralization is active. While UV radiation could be directly employed for decontamination, there are nevertheless considerable problems regarding its use, even from a large-scale perspective. In contrast, the use of cheap, robust, and green photocatalytic materials active under near UV-visible radiation shows interesting prospects. In this paper we take stock of the health problems related to PFAS, and then provide an update on strategies based on the use of photocatalysts and the latest findings regarding reaction mechanisms. Finally, we detail some brief considerations in relation to the economic aspects of possible solutions.

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Section: Metal Oxidesmentioning

confidence: 99%

Light-Induced Advanced Oxidation Processes as PFAS Remediation Methods: A Review

et al. 2021

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“…110,146 Moreover, the acidic conditions improved PFCAs photocatalytic degradation due to not only the higher oxidative power of h + 123 but also the favorable adsorption of PFCAs on photocatalysts surface. 137,138 The competitive adsorption between OH − and PFCAs on photocatalyst surface at alkaline pH led to reduced PFCAs adsorption and degradation efficiency. 134 However, PFOA decomposition rate using UV/carbonate was higher at slightly alkaline conditions (pH 8.8) compared to that of pH 4.09 and 11, 105 mainly due to decreasing CO 3 ˙ − formation at lower pH (pH 4.09) 147 and increasing CO 3 ˙ − decay (eqn (9)) in solutions with higher alkalinity (pH 11).…”

Section: Photo-oxidative Processesmentioning

confidence: 99%

“…Taking advantage of iron's complexing ability with carboxylate head group, CS-modification to facilitate electron transfer from PFOA to Fe(III), and specific tubular structure and large surface area of titanate nanotubes (TNTs), adsorptive photocatalysts, referred to as FeO/CS and Fe/ TNTs@AC, were developed for enhanced adsorption and photodegradation of PFOA. [137][138][139] At a dosage of 1.0 g L −1 , >99% of PFOA was adsorbed within 1 h, and led to the degradation and defluorination efficiencies of >90% and ∼60% of the pre-concentrated PFOA, respectively, within 4 h under simulated solar irradiation and UV (254 nm) irradiation. 137,139 In both studies, photodegradation of PFOA also regenerated the photocatalyst, allowing for repeated use without chemical regeneration.…”

Section: Mechanism and Processesmentioning

confidence: 99%

“…[137][138][139] At a dosage of 1.0 g L −1 , >99% of PFOA was adsorbed within 1 h, and led to the degradation and defluorination efficiencies of >90% and ∼60% of the pre-concentrated PFOA, respectively, within 4 h under simulated solar irradiation and UV (254 nm) irradiation. 137,139 In both studies, photodegradation of PFOA also regenerated the photocatalyst, allowing for repeated use without chemical regeneration. In the next work of the same research group, 138 another aspect of the application of adsorptive photocatalysts was reported in the decomposition of a mixture of PFAS in landfill leachate.…”

Section: Mechanism and Processesmentioning

confidence: 99%

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Photo-chemical/catalytic oxidative/reductive decomposition of per- and poly-fluoroalkyl substances (PFAS), decomposition mechanisms and effects of key factors: a review

Esfahani

Zeidabadi

Zhang

et al. 2022

Environ. Sci.: Water Res. Technol.

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“…Therefore, qualitative analysis of fluorescent components can be performed based on the position of the spectral peak corresponding to the maximum. The properties of components that can be used for analysis include structure, kinetics, functional groups, and so on (Li et al 2020a).…”

Section: Three-dimensional Fluorescence Spectrummentioning

confidence: 99%

Characterizing dissolved organic matter in Taihu Lake with PARAFAC and SOM method

Zhang

Tian

Dong

2022

Water Science and Technology

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The three-dimensional fluorescence spectrum has a significant amount of information than the single-stage scanning fluorescence spectrum. At the same time, the parallel factor (PARAFAC) analysis and neural network method can help explore the fluorescence characteristics further, thus could be used to analyse multiple sets of three-dimensional matrix data. In this study, the PARAFAC analysis and the self-organizing mapping (SOM) neural network method are firstly introduced comprehensively. They are then adopted to extract information of the three-dimensional fluorescence spectrum data set for fluorescence characteristics analysis of dissolved organic matter (DOM) in Taihu Lake water. Forty water samples with DOM species were taken from different seasons with the fluorescence information obtained through the three-dimensional fluorescence spectrum analysis, PARAFAC analysis and SOM analysis. The PARAFAC analysis results indicated that the main fluorescence components of dissolved organic matter in Taihu Lake water were aromatic proteins, fulvic acids, and dissolved microorganisms. While the SOM analysis results exhibited that the fluorescence characteristics of the dissolved organics in Taihu Lake varied seasonally. Therefore, the combined method of the three-dimensional fluorescence spectrum analysis, PARAFAC and SOM analysis can provide important information for the characterization of the fluorescence properties of dissolved organic matter in surface water bodies.

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A concentrate-and-destroy technique for degradation of perfluorooctanoic acid in water using a new adsorptive photocatalyst

Cited by 127 publications

References 84 publications

Light-Induced Advanced Oxidation Processes as PFAS Remediation Methods: A Review

Light-Induced Advanced Oxidation Processes as PFAS Remediation Methods: A Review

Photo-chemical/catalytic oxidative/reductive decomposition of per- and poly-fluoroalkyl substances (PFAS), decomposition mechanisms and effects of key factors: a review

Characterizing dissolved organic matter in Taihu Lake with PARAFAC and SOM method

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