Adsorption and solid-phase photocatalytic degradation of perfluorooctane sulfonate in water using gallium-doped carbon-modified titanate nanotubes

Zhu, Yangmo; Xu, Tianyuan; Fan, Liuping; Liu, Wen; Wang, Buhua; An, Byungryul

doi:10.1016/j.cej.2021.129676

Cited by 61 publications

(26 citation statements)

References 67 publications

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“…Fe/TNTs@AC was recycled without significant loss in adsorption and degradation capacity of the photocatalyst. Similarly, Ga/TNTs@AC showed faster adsorption kinetics and degraded~75.0% while mineralizing 66.2% of PFOS after 4 h of UV irradiation [70]. This type of study opens an avenue towards developing more such TiO 2 -based photocatalysts by integrating different strategies, with each modification step playing a specific role.…”

Section: Metal Oxidesmentioning

confidence: 85%

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: 85%

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

et al. 2021

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“…Since hydrodefluorination cannot be avoided during UV/sulfite treatment, an oxidative post-treatment is usually required to cleave the remaining C–F bonds in H-rich residues. These mechanistic insights will benefit the development and understanding of PFAS treatment technologies such as photochemical degradation in homogeneous − and heterogeneous systems, − electrochemical degradation, − and plasma treatment, − where reductive and/or oxidative processes are involved. The HO • oxidation results also provide data to compare with similar reaction systems , and achieve a deeper mechanistic understanding.…”

Section: Resultsmentioning

confidence: 99%

Defluorination of Omega-Hydroperfluorocarboxylates (ω-HPFCAs): Distinct Reactivities from Perfluoro and Fluorotelomeric Carboxylates

Gao

Bentel

et al. 2021

Environ. Sci. Technol.

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Omega-hydroperfluorocarboxylates (ω-HPFCAs, HCF2–(CF2) n−1–COO–) are commercially available in bulk quantities and have been applied in agrochemicals, fluoropolymer production, and semiconductor coating. In this study, we used kinetic measurements, theoretical calculations, model compound experiments, and transformation product analyses to reveal novel mechanistic insights into the reductive and oxidative transformation of ω-HPFCAs. Like perfluorocarboxylates (PFCAs, CF3–(CF2) n−1–COO–), the direct linkage between HC n F2n – and −COO– enables facile degradation under UV/sulfite treatment. To our surprise, the presence of the H atom on the remote carbon makes ω-HPFCAs more susceptible than PFCAs to decarboxylation (i.e., yielding shorter-chain ω-HPFCAs) and less susceptible to hydrodefluorination (i.e., H/F exchange). Like fluorotelomer carboxylates (FTCAs, C n F2n+1–CH 2CH 2–COO–), the C–H bond in HCF2–(CF2) n−1–COO– allows hydroxyl radical oxidation and limited defluorination. While FTCAs yielded PFCAs in all chain lengths, ω-HPFCAs only yielded –OOC–(CF2) n−1–COO– (major) and –OOC–(CF2) n−2–COO– (minor) due to the unfavorable β-fragmentation pathway that shortens the fluoroalkyl chain. We also compared two treatment sequencesUV/sulfite followed by heat/persulfate and the reversetoward complete defluorination of ω-HPFCAs. The findings will benefit the treatment and monitoring of H-containing per- and polyfluoroalkyl substance (PFAS) pollutants as well as the design of future fluorochemicals.

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“…Photons with energies greater than the bandgap energy excite valence band electrons in the photocatalysis oxidation process, boosting interactions with organic contaminants (Mohanta and Ahmaruzzaman 2021;Huang et al 2021). A positive hole (h + ) is generated in the valence band, while in the conduction band, an electron (e−) is generated when the catalyst active surface is illuminated with enough energy (Zhu et al 2021). The positive hole produces hydroxyl radicals by oxidizing either the organic contaminant or H 2 O.…”

Section: Heterogeneous Photocatalysismentioning

confidence: 99%

Solar photo-oxidation of recalcitrant industrial wastewater: a review

et al. 2022

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Conventional methods to clean wastewater actually lead to incomplete treatments, calling for advanced technologies to degrade recalcitrant pollutants. Herein we review solar photo-oxidation to degrade the recalcitrant contaminants in industrial wastewater, with focus on photocatalysts, reactor design and the photo-Fenton process. We discuss limitations due to low visible-light absorption, catalyst collection and reusability, and production of toxic by-products. Photodegradation of refractory organics by solar light is controlled by pH, photocatalyst composition and bandgap, pollutant properties and concentration, irradiation type and intensity, catalyst loading, and the water matrix.

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Adsorption and solid-phase photocatalytic degradation of perfluorooctane sulfonate in water using gallium-doped carbon-modified titanate nanotubes

Cited by 61 publications

References 67 publications

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

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

Defluorination of Omega-Hydroperfluorocarboxylates (ω-HPFCAs): Distinct Reactivities from Perfluoro and Fluorotelomeric Carboxylates

Solar photo-oxidation of recalcitrant industrial wastewater: a review

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