Demonstration of Photocatalytic Degradation of Per- and Polyfluoroalkyl Substances (PFAS) in Landfill Leachate Using 3D Printed TiO2 Composite Tiles

McQueen, Andrew D.; Tedrow, O’Niell R.; Ballentine, Mark; Kennedy, Alan J.

doi:10.1007/s11270-022-05911-3

Cited by 16 publications

(6 citation statements)

References 51 publications

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“…Methods include introducing surface defects or oxygen vacancies, metal-doping, heterojunction construction, and crystal facet regulation [21,26,28,39,71,74,96,101]. Furthermore, material composites and morphology regulation have been utilized to enhance reaction probabilities between PFASs and active groups, effectively enhancing the efficiency of PFAS degradation [25,28,40,104]. (2) For catalysts in the electrocatalytic oxidation of PFAS systems, current research mainly focuses on increasing the yield of active groups through various methods [21,85,94].…”

Section: Discussionmentioning

confidence: 99%

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Insights into Photo/Electrocatalysts for the Degradation of Per- and Polyfluoroalkyl Substances (PFAS) by Advanced Oxidation Processes

Chen,

Yuan,

Yang

et al. 2023

Catalysts

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Per- and polyfluoroalkyl substances (PFASs) are an emerging group of persistent organic pollutants in aquatic environments with high levels of toxicity and bioaccumulation. The risks posed by PFASs to the environment and health have attracted increasing attention. To remove them from water, advanced oxidation processes (AOPs), with the merits of high efficiency and low cost, are mainly used. Photo/electrocatalytic heterogeneous AOPs, with the assistance of nanostructured catalysts and external energy in the form of light/electricity, have emerged as one of the most powerful techniques, overcoming the difficulty associated with defluorination and achieving the effective and complete degradation of PFASs in water. The structures of photo/electrocatalysts play a critical role in the production of reactive oxygen species, the electron transfer process, and the degradation pathway and its efficiency. Herein, to elucidate the structure–performance relationship, a review of photo/electrocatalysts for the enhanced degradation of PFASs in heterogeneous AOPs, organized according to their composition and nanostructure design, is provided. This review article is mainly focused on (1) the mechanisms and pathways of PFAS degradation by heterogeneous photo/electrocatalytic AOPs, and (2) the structural designs and modifications of photo/electrocatalysts for the enhanced degradation of PFASs by heterogeneous AOPs. Finally, the challenges and prospects for future research into photo/electrocatalysts of heterogeneous AOPs in the field of PFAS remediation are discussed.

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Section: Discussionmentioning

confidence: 99%

“…Therefore, photocatalytic and electrocatalytic AOPs in heterogeneous systems are promising for the efficient and complete removal of PFASs in practice. These AOPs have recently attracted considerable research interest, with a vast body of relevant literature [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Insights into Photo/Electrocatalysts for the Degradation of Per- and Polyfluoroalkyl Substances (PFAS) by Advanced Oxidation Processes

Chen,

Yuan,

Yang

et al. 2023

Catalysts

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Section: Chemical Treatmentsmentioning

confidence: 99%

“…Heterogeneous photocatalytic oxidation with semiconductor-based catalysts effectively degrades PFAS in landfill leachate under ultraviolet irradiation [129,130]. A 3DP photocatalyst fabricated using polylactic acid compounded with TiO2 (15 wt%) and 3D printed into tiles effectively decreased concentrations of PFAS in landfill leachate; photocatalytic degradation was achieved for most of the PFAS evaluated: PFOS, PFOA, PFHPA, PFHxS, PFNA, PFDA, and PFOSAm; greater than 80% removal of PFOS, PFNA, PFDA, and PFOSAm was achieved with 24-h of photocatalysis [129]. An adsorptive photocatalyst of iron-doped, carbon-modified composite (Fe/TNTs@AC) was also able to remove PFAS selectively; at a dosage of 10 g/L, fresh Fe/TNTs@AC removed >95% of 13 PFAS from the leachate within 2 h, 86% after first regeneration, and 74% when reused three times; Fe/TNTs@AC degraded >92% of 18 PFAS in 8 h under the field conditions, and when the PFAS-laden solids were subjected to the UV-H2O2 system, approximately 84% of 16 PFAS in the solid phase were degraded; nevertheless, Fe/TNTs@AC was less efficient for PFBA and PFPeA owing to the transformation of longer-chain homologs into these short-chain PFAS and competition of adsorption sites by the longer-chain PFAS [130].…”

Section: Chemical Treatmentsmentioning

confidence: 99%

An Overview of Treatments for Ultraviolet Quenching Substances (UVQS) and Per- and Polyfluoroalkyl Substances (PFAS) Removal from Landfill Leachate

Márquez

2024

Recent Prog Mater

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Organics found in landfill leachate (humic acids, fulvic acids, and hydrophilic fraction) have a solid ability to absorb ultraviolet (UV) radiation, which negatively affects UV disinfection; leachate ultraviolet quenching substances (UVQS) can, therefore, have a significant impact on the cotreatment of landfill leachate and sewage in wastewater treatment plants. On the other hand, per- and polyfluoroalkyl substances (PFAS), which pose potential risks to the environment and human health, commonly exist in landfill leachate due to their wide application in various industrial and consumer products. Therefore, removing UVQS and PFAS from landfill leachate is crucial. In this work, the advances in removing UVQS and PFAS from landfill leachate in the last decade are reviewed to find a standard treatment for both contaminants to lower the costs and space required for the leachate treatment process. The benefits and drawbacks of biological, physical, chemical, and electrochemical treatments were examined. Physical, chemical, and electrochemical treatments showed advantages over biological treatments but higher energy and/or material costs. The global analysis indicated that similar technologies, such as adsorption or osmosis, can be used as effective methods to remove UVQS and PFAS from landfill leachate <em>and suggested that both types of pollutants</em> could be eliminated simultaneously with a single treatment based on one of these two technologies.

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“…Typical PFOA and PFOS degradation ranges between 15% and 99%, while for other PFASs such as perfluoronanonoic acid (PFNA), perfluorodecanoic acid (PFDA), and perfluorooctanesulfonamide (PFOSA), greater than 80% degradation has been achieved depending on the variables mentioned (McQueen et al, 2022; Wang et al, 2017). Transformation products generally detected during degradation of PFAAs include shorter‐chain PFAAs such as PFHpA (perfluoroheptanoic acid), PFHxA (perfluorohexanoic acid), PFPeA (perfluoropentanoic acid), PFBA, perfluoropropionic acid (PFPrA), and trifluoroacetic acid (TFA) (Wang et al, 2017).…”

Section: Destruction Technologiesmentioning

confidence: 99%

Available and emerging liquid treatment technologies for PFASs

DiGuiseppi,

Newell,

Carey

et al. 2024

Remediation Journal

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Per‐ and polyfluoroalkyl substances (PFASs) are present at a wide range of private sector facilities and United States (US) government installations, including those operated by the Department of Defense, the Department of Energy, the National Aeronauts and Space Administration, and other entities, as well as additional sites worldwide. Impacts have been identified in a range of environmental media including drinking water, groundwater, surface water, leachate, wastewater, soil, sediment, and soil gas. Treatment technologies to remove or destroy PFASs cost effectively have proven to be elusive to the industry. However, recent developments are bringing that goal close to reality for some media. This article has been prepared to address only liquid treatment technologies. Soil treatment technologies are presently a lower priority and may be addressed in future articles. The challenge of identifying and evaluating available and emerging liquid treatment technologies was put to the PFAS Experts Symposium in Houston, Texas, on June 7–8, 2023, which was attended by PFAS professionals and subject matter experts with a broad range of backgrounds. The discussions covered a variety of technical approaches and led to the preparation of this manuscript. This article strives to concisely summarize modern technical approaches that are potentially applicable to managing liquid media at PFAS‐impacted sites. Currently, ex situ sorbent technologies using granular activated carbon (GAC) and ion exchange (IX) resin are commercially available and most widely used. Other liquid technologies are summarized and current applications are presented to allow the reader to evaluate each technology for their particular use. This article is not intended to provide guidance on site‐specific design of treatment systems, but instead to serve as an update to earlier articles from this group and others addressing PFAS treatment technologies and related PFAS topics.

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Demonstration of Photocatalytic Degradation of Per- and Polyfluoroalkyl Substances (PFAS) in Landfill Leachate Using 3D Printed TiO2 Composite Tiles

Cited by 16 publications

References 51 publications

Insights into Photo/Electrocatalysts for the Degradation of Per- and Polyfluoroalkyl Substances (PFAS) by Advanced Oxidation Processes

Insights into Photo/Electrocatalysts for the Degradation of Per- and Polyfluoroalkyl Substances (PFAS) by Advanced Oxidation Processes

An Overview of Treatments for Ultraviolet Quenching Substances (UVQS) and Per- and Polyfluoroalkyl Substances (PFAS) Removal from Landfill Leachate

Available and emerging liquid treatment technologies for PFASs

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