Photo enhanced degradation of polyfluoroalkyl and perfluoroalkyl substances

Olatunde, Olalekan C.; Kuvarega, Alex T.; Onwudiwe, Damian C.

doi:10.1016/j.heliyon.2020.e05614

Cited by 46 publications

(40 citation statements)

References 151 publications

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“…Olatunde et al [147] undertook an economical evaluation on the applications of AOPs for degradation of PFAS substances, taking into consideration the stage of development of the technology, energy consumption, the time required to achieve 90% degradation of the substance, and the total volume of contaminated solution. Table 3 summarizes the results obtained with initial budgeting costs.…”

Section: Economic Aspectsmentioning

confidence: 99%

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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: Economic Aspectsmentioning

confidence: 99%

“…Relative cost comparisons between the most successful employed techniques employed for PFAS degradation (adapted from[147]). …”

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confidence: 99%

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

et al. 2021

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“…Finally, it is worth mentioning that our approach highlights the importance of utilizing these RT-TDDFT techniques for probing excited-state, photo-induced degradation of PFAS contaminants, which have started to garner immense attention in the scientific community. 7,10 Most importantly, these excited-state, photo-induced mechanisms cannot be gleaned from conventional ground-state DFT calculations, and the RT-TDDFT techniques used in this work enable a new capability for understanding the excited-state dynamical mechanisms in these important degradation processes.…”

Section: Resultsmentioning

confidence: 99%

“…6 Because of their resistance to conventional chemical treatments, immense interest has recently focused on photo-induced processes for directly decomposing PFAS contaminants. [7][8][9][10][11] In contrast to conventional filtration techniques that merely remove PFAS (which still require subsequent treatment after filtration), very recent studies have suggested that PFAS degradation can be accelerated with electromagnetic/optical fields, such as those used in photocatalysis or commercially available laser sources. [7][8][9][10][11][12] While these recent findings hold immense promise for directly treating PFAS, the exact mechanisms in these degradation processes remain unknown, 8 and a guided path for rationally identifying photoactive materials and experimental conditions remains elusive.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced degradation of PFASs: Excited-state mechanisms from real-time time-dependent density functional theory

Yamijala

Shinde

Hanasaki

et al. 2021

Preprint

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Per-and polyfluoroalkyl substances (PFASs) are hazardous, carcinogenic, and bioaccumulative contaminants found in drinking water sources. To mitigate and remove these persistent pollutants, 2 recent experimental efforts have focused on photo-induced processes to accelerate their degradation; however, the mechanistic details of these promising degradation processes remain unclear. To shed crucial insight on these electronic-excited state processes, we present the first study of photo-induced degradation of explicitly-solvated PFASs using excited-state, real-time time-dependent density functional theory (RT-TDDFT) calculations. Furthermore, our large-scale RT-TDDFT calculations show that these photo-induced excitations can be highly selective by enabling a charge-transfer process that only dissociates the C-F bond while keeping the surrounding water molecules intact. Collectively, the RT-TDDFT techniques used in this work (1) enable a new capability for probing photo-induced mechanisms that cannot be gleaned from conventional ground-state DFT calculations and (2) provide a rationale for understanding ongoing experiments that are actively exploring photo-induced degradation of PFAS and other environmental contaminants.

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“…mdpi.com/article/10.3390/membranes12070662/s1, Table S1: Recently reported adsorption techniques to remove PFAS from wastewater, Table S2: Recently reported studies on ion exchange resins for PFAS removal, SI 1: Destruction techniques. References [23,46,48,53,56,58,66,128,132,135,[141][142][143][144][145][146][147]…”

Section: Supplementary Materialsmentioning

confidence: 99%

A Review on Removal and Destruction of Per- and Polyfluoroalkyl Substances (PFAS) by Novel Membranes

Das

Ronen

2022

Membranes

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Per- and Polyfluoroalkyl Substances (PFAS) are anthropogenic chemicals consisting of thousands of individual species. PFAS consists of a fully or partly fluorinated carbon–fluorine bond, which is hard to break and requires a high amount of energy (536 kJ/mole). Resulting from their unique hydrophobic/oleophobic nature and their chemical and mechanical stability, they are highly resistant to thermal, chemical, and biological degradation. PFAS have been used extensively worldwide since the 1940s in various products such as non-stick household items, food-packaging, cosmetics, electronics, and firefighting foams. Exposure to PFAS may lead to health issues such as hormonal imbalances, a compromised immune system, cancer, fertility disorders, and adverse effects on fetal growth and learning ability in children. To date, very few novel membrane approaches have been reported effective in removing and destroying PFAS. Therefore, this article provides a critical review of PFAS treatment and removal approaches by membrane separation systems. We discuss recently reported novel and effective membrane techniques for PFAS separation and include a detailed discussion of parameters affecting PFAS membrane separation and destruction. Moreover, an estimation of cost analysis is also included for each treatment technology. Additionally, since the PFAS treatment technology is still growing, we have incorporated several future directions for efficient PFAS treatment.

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Photo enhanced degradation of polyfluoroalkyl and perfluoroalkyl substances

Cited by 46 publications

References 151 publications

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

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

Photo-induced degradation of PFASs: Excited-state mechanisms from real-time time-dependent density functional theory

A Review on Removal and Destruction of Per- and Polyfluoroalkyl Substances (PFAS) by Novel Membranes

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