Enhanced Removal of Polyfluoroalkyl Substances by Simple Modified Biochar: Adsorption Performance and Theoretical Calculation

ACS ES&T Water, Journal Year: 2023, Volume and Issue: 3(3), P. 817 - 826

Published: Feb. 13, 2023

To cope with the widespread polyfluoroalkyl substance (PFAS) pollution in global aquatic environment, this study prepared an acid-modified biochar adsorbent derived from sludge satisfactory performance. The theoretical maximum adsorption capacities of for perfluorooctane sulfonic acid (PFOS) and perfluorooctanoic (PFOA) were determined to be 72.17 45.88 mg·g–1, respectively. calculation surface functional groups PFOS PFOA was first performed study, mechanism process inferred a combination experimental results redundancy analysis. is composed mainly following three aspects: (I) electrostatic interaction between positively charged deprotonated PFAS; (II) hydrogen bonding anionic species PFAS groups; (III) hydrophobic long-chain biochar. Electrostatic plays major role main mechanisms under acidic media. Meanwhile, different have energies PFAS, C═O has highest energy. findings work could provide great insights into on modified as environmentally friendly promote resource reuse, improve water quality, ensure human health.

Language: Английский

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Emerging applications of biochar: A review on techno-environmental-economic aspects

Bioresource Technology, Journal Year: 2023, Volume and Issue: 388, P. 129745 - 129745

Published: Sept. 9, 2023

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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Environmental behavior of per- and polyfluoroalkyl substances (PFASs) and the potential role of biochar for its remediation: a review

Biochar, Journal Year: 2025, Volume and Issue: 7(1)

Published: Jan. 17, 2025

Abstract Per- and polyfluoroalkyl substances (PFASs), commonly known as ‘‘forever chemicals’’, are persistent organic pollutants that widely distributed in the environment. Due to their toxicity resistance degradation, PFASs classified emerging contaminants, increasing attention is being paid remediation. Biochar, an environmentally friendly cost-effective adsorbent, shows potential for remediating contamination. The application of biochar remediation has garnered growing interest. Compared other adsorbents, more economical raw materials its preparation readily available. However, there currently no comprehensive review summarizing effects on environmental behavior PFASs. This aims fill gap by providing in-depth discussion synthesis existing literature this area. It focuses PFASs, specifically addressing adsorption mechanisms factors influencing effectiveness A proposed mechanism which photodegrades through generation free radicals, addition conventional (such pore filling, hydrogen bonding, hydrophobic interactions, electrostatic interactions), explored. Furthermore, discusses ability reduce likelihood entering food chain water soil evaluates feasibility limitations using removal. Finally, we identify future research directions support safe effective use remediation, so promote advancement green technologies. Graphic

Language: Английский

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A Critical Review on PFAS Removal from Water: Removal Mechanism and Future Challenges

Sustainability, Journal Year: 2023, Volume and Issue: 15(23), P. 16173 - 16173

Published: Nov. 21, 2023

Per and polyfluoroalkyl substances (PFAS) have been extensively employed in a broad range of manufacturing consumer goods due to their highly persistent nature. PFAS exposure is recognized pose serious health hazards; therefore, addressing pollution water has become top priority for public environmental protection organizations. This review article focuses on the efficiency different removal techniques (activated carbon, biochar, ion exchange resin, membrane filtration, reverse osmosis, metal-organic frameworks, foam fractionation, ozone destruction techniques) eliminating types short- long-chain from water. Hydrophobicity electrostatic interactions are revealed be primary mechanisms elimination PFAS. The all eradicate short-chain comparatively lower compared most efficient but some drawbacks, including formation precursors high operational costs. According findings study, it anticipated that combined methods will required effectively remediate PFAS-contaminated

Language: Английский

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PFOA remediation from aqueous media using CTAB impregnated activated carbon: A closed-loop sustainable study with comprehensive selectivity analysis

Journal of Water Process Engineering, Journal Year: 2023, Volume and Issue: 54, P. 103965 - 103965

Published: June 29, 2023

Language: Английский

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Ecological risk of per- and polyfluorinated alkyl substances in the phytoremediation process: a case study for ecologically keystone species across two generations

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 951, P. 174962 - 174962

Published: July 26, 2024

Language: Английский

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Harnessing Sustainable Biochar-based Composites for Effective PFAS Removal from Wastewater

Current Opinion in Environmental Science & Health, Journal Year: 2025, Volume and Issue: unknown, P. 100594 - 100594

Published: Jan. 1, 2025

Language: Английский

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Adsorption of perfluorooctanoic acid from aqueous matrices onto chitosan-modified magnetic biochar: Response surface methodology-based modeling, performance, and mechanism

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 125734 - 125734

Published: Jan. 1, 2025

Language: Английский

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In situ self-sacrificial synthesis of polypyrrole/biochar composites for efficiently removing short- and long-chain perfluoroalkyl acid from contaminated water

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 344, P. 118745 - 118745

Published: Aug. 8, 2023

Language: Английский

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