Mechanisms and pathways of PFAS degradation by advanced oxidation and reduction processes: A critical review

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 450, P. 138352 - 138352

Published: Aug. 2, 2022

Language: Английский

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A Sulfur-Containing Capsule-Based Metal-Organic electrochemical sensor for Super-Sensitive capture and detection of multiple Heavy-Metal ions

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 438, P. 135639 - 135639

Published: March 7, 2022

Language: Английский

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Treatment technologies for removal of per- and polyfluoroalkyl substances (PFAS) in biosolids

Chemical Engineering Journal, Journal Year: 2022, Volume and Issue: 453, P. 139964 - 139964

Published: Oct. 22, 2022

Language: Английский

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Environmental impacts, exposure pathways, and health effects of PFOA and PFOS

Ecotoxicology and Environmental Safety, Journal Year: 2023, Volume and Issue: 267, P. 115663 - 115663

Published: Nov. 1, 2023

Per- and polyfluoroalkyl substances (PFAS) are synthetic chemicals that have been widely utilized in various industries since the 1940s, now emerged as environmental contaminants. In recent years, perfluorooctanoic acid (PFOA) perfluorooctane sulfonate (PFOS) restricted replaced with several alternatives. The high persistence, bioaccumulation, toxicity of these contributed to their emergence contaminants, aspects behavior remain largely unknown require further investigation. trace level PFAS makes development a monitoring database challenging. Additionally, potential health issues associated not yet fully understood due ongoing research inadequate evidence (experimental epidemiological studies), especially regard combined effects exposure mixtures human risks from drinking water consumption. This in-depth review offers unprecedented insights into pathways toxicological impacts PFAS, addressing critical knowledge gaps behaviors implications. It presents comprehensive NABC—Needs, Approach, Benefits, Challenges—analysis guide future strategies for sustainable management pervasive

Language: Английский

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Enhancing the piezo-photocatalytic tetracycline degradation activity of BiOBr by the decoration of AuPt alloy nanoparaticles: Degradation pathways and mechanism investigation

Applied Surface Science, Journal Year: 2023, Volume and Issue: 638, P. 158136 - 158136

Published: July 28, 2023

Language: Английский

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Effective PFAS degradation by electrochemical oxidation methods-recent progress and requirement

Chemosphere, Journal Year: 2023, Volume and Issue: 321, P. 138109 - 138109

Published: Feb. 12, 2023

Language: Английский

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Electrochemical Oxidation for Treatment of PFAS in Contaminated Water and Fractionated Foam─A Pilot-Scale Study

ACS ES&T Water, Journal Year: 2023, Volume and Issue: 3(4), P. 1201 - 1211

Published: March 15, 2023

Per- and polyfluoroalkyl substances (PFAS) are persistent synthetic contaminants that present globally in water exceptionally difficult to remove during conventional treatment processes. Here, we demonstrate a practical train combines foam fractionation concentrate PFAS from groundwater landfill leachate, followed by an electrochemical oxidation (EO) step degrade the PFAS. The study combined up-scaled experimental approach with thorough characterization strategies, including target analysis, sum parameters, toxicity testing. Additionally, EO kinetics were successfully reproduced newly developed coupled numerical model. mean total degradation over designed reached 50%, long- short-chain degrading up 86 31%, respectively. resulted decrease toxic potency of water, as assessed transthyretin binding bacterial bioluminescence bioassays. Moreover, extractable organofluorine concentration decreased 44%. Together, these findings provide improved understanding promising for on-site remediation PFAS-contaminated water.

Language: Английский

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Recent Advances in the Electrochemical Defluorinative Transformations of C—F Bonds

Chinese Journal of Chemistry, Journal Year: 2024, Volume and Issue: 42(16), P. 1913 - 1928

Published: April 24, 2024

Comprehensive Summary Organic fluorine compounds are ubiquitous and pivotally important organic molecules, yet their activation transformation have long been a formidable challenge due to the high energy low reactivity of C—F bonds. electrosynthesis, an environmentally benign synthetic method in chemistry, enables myriad chemical transformations without need for external redox reagents. In recent years, electrochemistry has emerged as powerful tool achieving bonds fluorine‐containing compounds. This review aims succinctly recapitulate latest advancements electrochemical defluorinative delve into reaction design, mechanistic insights, developmental prospects these methods. Key Scientists 1959, Lund was first pioneer electroreduction CF 3 CH group. Electrochemistry lately provided new opportunities efficient conversion fluorides. 2020, Zhou coworkers discovered carboxylation α‐CF alkenes. Lambert colleagues reported electrophotocatalytic amination aryl Electrochemical hydrodefluorination trifluoromethylketones developed by Lennox 2021. same year, Wang Guo disclosed radical alkylation alkenes with Katritzky salts alkyl precursors. Subsequently, Wu Liao described transition‐metal‐free, site‐selective arylation polyfluoroarenes (het)arenes using paired electrophotocatalysis. 2023, numerous efforts were made achieve bond activation. Xia organoboron‐controlled chemoselective sequential (deutero)hydrodefluorination trifluoroacetamides.

Language: Английский

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Treatment of aqueous per- and poly-fluoroalkyl substances: A review of biochar adsorbent preparation methods

Chemosphere, Journal Year: 2024, Volume and Issue: 357, P. 142088 - 142088

Published: April 20, 2024

Per- and poly-fluoroalkyl substances (PFAS) are synthetic chemicals widely used in everyday products, causing elevated concentrations drinking water posing a global challenge. While adsorption methods commonly employed for PFAS removal, the substantial cost environmental footprint of commercial adsorbents highlight need more cost-effective alternatives. Additionally, existing exhibit limited effectiveness, particularly against diverse types, such as short-chain PFAS, necessitating modifications to enhance capacity. Biochar can be considered eco-friendly alternative conventional adsorbents. With abundant feedstocks favorable physicochemical properties, biochar shows significant potential applied an adsorbent removing contaminants from water. Despite its effectiveness adsorbing different inorganic organic environments, some factors restrict effective application adsorption. These related characteristics well chemistry. Therefore, have been introduced overcome these limitations improve biochar's This review explores preparation conditions, including pyrolysis process, activation, modification techniques capacity types PFAS. It addresses critical questions about performance composites, mechanisms governing adsorption, challenges, future perspectives this field. The surge research on indicates growing interest, making timely valuable resource in-depth exploration remediation.

Language: Английский

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Electrochemical Reduction of Perfluorooctanoic Acid (PFOA): An Experimental and Theoretical Approach

Journal of the American Chemical Society, Journal Year: 2024, Volume and Issue: 146(15), P. 10687 - 10698

Published: April 5, 2024

Perfluorooctanoic acid (PFOA) is an artificial chemical of global concern due to its high environmental persistence and potential human health risk. Electrochemical methods are promising technologies for water treatment because they efficient, cheap, scalable. The electrochemical reduction PFOA one the current methodologies. This process leads defluorination carbon chain hydrogenated products. Here, we describe a mechanistic study in gold electrodes. By using linear sweep voltammetry (LSV), E0′ −1.80 V vs Ag/AgCl was estimated. Using scan rate diagnosis, determined electron-transfer coefficient (αexp) 0.37, corresponding concerted mechanism. strong adsorption into surface confirmed by Langmuir-like isotherm absence (KA = 1.89 × 1012 cm3 mol–1) presence negative 3.94 107 mol–1, at −1.40 Ag/AgCl). Based on Marcus–Hush's theory, calculations show solvent reorganization energy (λ0) 0.9 eV, suggesting large electrostatic repulsion between perfluorinated water. estimated free transition state electron transfer (ΔG‡ 2.42 eV) suggests that it thermodynamically reaction-limiting step. 19F – 1H NMR, UV–vis, mass spectrometry studies confirm displacement fluorine atoms hydrogen. Density functional theory (DFT) also support mechanism reductive PFOA, agreement with experimental values.

Language: Английский

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