Health & Environmental Research Online (HERO)


Per- and Polyfluoroalkyl Substances (PFAS)


1,306 References Were Found:

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

An overview of advanced reduction processes for bromate removal from drinking water: Reducing agents, activation methods, applications and mechanisms

Authors: Xiao, Q; Yu, S; Li, L; Wang, T; Liao, X; Ye, Y (2017) HERO ID: 3981937

[Less] Bromate (BrO3(-)) is a possible human carcinogen regulated at a strict standard of 10μg/L in drinking . . . [More] Bromate (BrO3(-)) is a possible human carcinogen regulated at a strict standard of 10μg/L in drinking water. Various techniques to eliminate BrO3(-) usually fall into three main categories: reducing bromide (Br(-)) prior to formation of BrO3(-), minimizing BrO3(-) formation during the ozonation process, and removing BrO3(-) from post-ozonation waters. However, the first two approaches exhibit low degradation efficiency and high treatment cost. The third workaround has obvious advantages, such as high reduction efficiency, more stable performance and easier combination with UV disinfection, and has therefore been widely implemented in water treatment. Recently, advanced reduction processes (ARPs), the photocatalysis of BrO3(-), have attracted much attention due to improved performance. To increase the feasibility of photocatalytic systems, the focus of this work concerns new technological developments, followed by a summary of reducing agents, activation methods, operational parameters, and applications. The reaction mechanisms of two typical processes involving UV/sulfite homogeneous photocatalysis and UV/titanium dioxide heterogeneous photocatalysis are further summarized. The future research needs for ARPs to reach full-scale potential in drinking water treatment are suggested accordingly.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

High perfluorooctanoic acid exposure induces autophagy blockage and disturbs intracellular vesicle fusion in the liver: Supplementary materials

Authors: Yan, S; Zhang, H; Guo, X; Wang, J; Dai, J (2017) Archives of Toxicology 91. [Supplemental Data] HERO ID: 3986361

Abstract: Supplementary materials

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Rapid determination of small molecule pollutants using metal-organic frameworks as adsorbent and matrix of MALDI-TOF-MS

Authors: Wang, S; Niu, H; Zeng, Tao; Zhang, X; Cao, D; Cai, Y (2017) HERO ID: 3981934

[Less] Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has been . . . [More] Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS) has been commonly used for the determination of macromolecules owing to the high sensitivity and convenience. However, the direct analysis of small molecule with MALDI-TOF-MS remains a challenge due to the matrix interference in the low mass region. In this paper, metal-organic frameworks (MOFs: MOF-5, MOF-235, Cu-btc MOFs and Uio-66(Zr)-2OH) were successfully used as both adsorbent and significant matrix of MALDI-TOF-MS method for the analysis of small molecule pollutants. Benzo(a)pyrene (BaP) and perfluorinated compounds (PFCs) were chosen as model analytes to investigate the matrix function of MOFs with LDI measurement in positive and negative reflection mode, respectively. As a result, MOFs exhibit high laser desorption/ionization efficiency and function well in both positive-ion and negative ion modes. Compared to the MS spectra with conventional matrices, MS spectra obtained on MOFs matrix are only featured by deprotonated molecule ion peaks without background interference. Furthermore, MOFs, with large surface area and pi-pi stacking structure, can also enrich trace amounts of small molecule pollutants from solution efficiently and quickly. According to these, we developed a simple method in which MOFs-solid-phase extraction (SPE) enrichment was combined with MALDI-TOF-MS to realize the direct analysis of perfluorooctanesulfonate (PFOS) in real water samples. (C) 2016 Elsevier Inc. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Aromatic Esters, Carbinols, and Derivatives Thereof with Perfluorohexyl Residues as Alternatives to Perfluoroalkanecarboxylic and -sulfonic Acids

Authors: Alpers, T; Muesmann, TWT; Temme, O; Christoffers, J (2017) HERO ID: 3981907

[Less] Four perfluorohexyl carbinols have been prepared from the corresponding Grignard reagent and benzaldehyde, . . . [More] Four perfluorohexyl carbinols have been prepared from the corresponding Grignard reagent and benzaldehyde, terephthalaldehyde, isophthalaldehyde, and trimesaldehyde. The corresponding secondary alcohols were then transformed by alkylation and acylation reactions to form a total of 14 ethers (methyl, ethyl, propyl, and n-hexyl ethers) and esters (acetyl and 2-ethylhexanoyl), respectively. Furthermore, 11 perfluoroalkyl carboxylates were prepared from aromatic, heteroaromatic, and aliphatic mono-, di-, tri-, and tetracarboxylic acids and trideca-fluorooctanol. The wettability of all 29 materials was investigated by the water contact angle measurements of thin films on glass surfaces. In up to six cases, contact angles greater than 130 degrees were observed, which indicates that the products might be suitable candidates for the impregnation of surfaces. With their relatively short perfluoroalkyl side-chains and therefore low bioaccumulativity, the target compounds might be beneficial alternatives to established products.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Recovery of perfluorooctane sulfonate (PFOS) and perfluorooctanoate (PFOA) from dilute water solution by foam flotation

Authors: Lee, YuChi; Wang, PoYen; Lo, SL; Huang, CP (2017) HERO ID: 3981932

[Less] The separation and recovery of surfactants, namely, Perfluorooctane sulfonate (PFOS) and Perfluorooctanoate . . . [More] The separation and recovery of surfactants, namely, Perfluorooctane sulfonate (PFOS) and Perfluorooctanoate (PFOA) was conducted using foam flotation process aided by metallic activators, including Al(III), Fe(III), La(III), Ca(II), Fe(II), and K(I). The PFOS removal efficiency followed the following decreasing order: Fe(III) La(III) > Al(III) > Ca(II) > Fe(II) > K(I). Both PFOS and FPOA had a removal efficiency of > 99% in the presence of 11.5 mM of Fe(III) in 5 min. High Fe(III) dose and elevated initial PFOS and PFOA concentration enhanced surfactant removal. PFOS and PFOA removal also increased with decreasing pH with maximum removal occurring at the lowest pH of 2.3 studied; whereas no significant removal was observed at pH >= 6. At high pH, hydroxide ion (OH-) competed with PFOS or PFOA for Fe3+ and formed ferric hydroxo species that impeded surfactant removal. However, by adjusting the pH of the concentrate scum to 7.0, approximately 84-91% of PFOS and PFOA could be recovered. Foam flotation using ferric ion as activator, is a simple, fast, and cost-effective method of broad environmental friendly applications for the separation and recovery of PFOS and PFOA from dilute water solutions. (C) 2016 Elsevier B.V. All rights reserved.

Journal Article
Journal Article

Fabrication of Ag/AgBr/Ga2O3 heterojunction composite with efficient photocatalytic activity

Authors: Liu, Q; Yu, Z; Li, M; Hou, Y; Sun, Lei; Wang, Li; Peng, Z; Chen, D; Liu, Y (2017) HERO ID: 3981828

[Less] A novel Ag/AgBr/Ga2O3 composite with heterojunction microstructure was synthesized by using chemical . . . [More] A novel Ag/AgBr/Ga2O3 composite with heterojunction microstructure was synthesized by using chemical deposition followed by UV reduction method. High resolution transmission electron microscopy showed that Ga2O3 microparticles were tightly attached with Ag/AgBr to form a heterojunction. UV-vis diffuse reflectance spectra revealed that light response capability of Ga2O3 was enhanced significantly when combined with Ag/AgBr. The degradation efficiency of methyl orange within 30 min under UV light irradiation with Ag/AgBr/Ga2O3, Ag/AgBr and Ga2O3 were 89%, 74% and 48%, respectively. Ag/AgBr/Ga2O3 not only showed excellent photocatalytic activity under UV light, but also exhibited efficient photocatalysis capacity under visible light. Furthermore, the mechanism of charge separation in the heterojunction under UV light irradiation was proposed. (C) 2017 Elsevier B.V. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Mechanochemical destruction of perfluorinated pollutants and mechanosynthesis of lanthanum oxyfluoride: A Waste-to-Materials process

Authors: Cagnetta, G; Zhang, Q; Huang, Jun; Lu, M; Wang, Bin; Wang, Y; Deng, S; Yu, G (2017) HERO ID: 3981857

[Less] Perfluorinated chemicals (PFCs) are attracting increasing concern due to their chemical stability and . . . [More] Perfluorinated chemicals (PFCs) are attracting increasing concern due to their chemical stability and toxicity, which make them classifiable as persistent organic pollutants. However, such compounds are employed for the manufacture of many industrial and consumer products, hence their substitution is not possible in the near future. Suitable technologies for PFCs environmentally sound management are necessary. High energy ball milling With KOH has been proved to obtain PFCs safe destruction, but With excessive reagent. In the present study, a Waste-to-Materials solution is proposed: PFCs are co-milled with stoichiometric amounts of La2O3 and thus are fully converted into LaOF, a noteworthy luminescent material with many potential industrial applications. Reaction mechanism is also investigated: Ball milling process activates La2O3; this latter provokes oxidation to CO2 and carbonization of PFCs; fluorides are incorporated into the La2O3's lattice to form the oxyfluoride. Interestingly, kinetic analysis suggests that the mechanical activation of La2O3 might follow a zeroth-order reaction rate. (C) 2017 Elsevier B.V. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Removal of perfluorooctane sulfonate by a gravity-driven membrance: Filtration performance and regeneration behavior

Authors: Guo, Hao; Wang, J; Han, Ye; Feng, Y; Shih, K; Tang, CY (2017) HERO ID: 3981933

[Less] Perfiuorooctane sulfonate (PFOS) has been under the spotlight in recent decades due to its adverse environmental . . . [More] Perfiuorooctane sulfonate (PFOS) has been under the spotlight in recent decades due to its adverse environmental and ecological concerns. Existing treatment methods (such as reverse osmosis and nanofiltration) for this recalcitrant surfactant are generally energy intensive. In this study, for the first time, a gravity-driven filtration using a highly porous nanofibrous membrane was systematically investigated for PFOS removal. The membrane possesses a high water permeability of 354.9 LMH/kPa, allowing the membrane to be operated under gravity-driven conditions. PFOS removal-efficiency ranging,from 36% to 90% was observed under a wide range of water chemistry conditions (5-20-ppb PFOS, pH 4-10, and, ionic strength 1-10 mM). The best removal efficiency was obtained at pH 4 and 10 mM ionic strength as a result of the enhanced PFOS-membrane electrostatic attraction and/or weakened electrostatic repulsion. The removal efficiency was also higher at lower membrane permeate flux due to the increased residence time of PFOS molecules in the internal pores of the membrane. Simple methanol rinsing was able to effectively regenerate the membrane, and the high PFOS removal efficiency can be maintained over 20 cycles of regeneration. The current study may provide important insights of using highly porous membranes for energy-efficient PFOS removal and recovery. (C) 2016 Elsevier B.V. All rights reserved.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Enhanced Performance of Surface Modified Tio(2) Nanotubes for the Decomposition of Perfluorooctanoic Acid

Authors: Tian, A; Wu, Y; Mao, Kai (2017) HERO ID: 3981780

[Less] Photocatalytic decomposition of an emerging pollutant perfluorooctanoic acid (PFOA) in aqueous solution . . . [More] Photocatalytic decomposition of an emerging pollutant perfluorooctanoic acid (PFOA) in aqueous solution by Ag nanoparticles and molecularly imprinted polymers modified TiO2 nanotubes were investigated. The modified TiO2 were characterized by field-emission scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Fourier-transform infrared spectroscopy. PFOA decomposition by the MIP-Ag/TiO2 NTs reached 91% after 8 h reaction. Compared with other prepared photo catalyst, MIP-Ag/TiO2 NTs exhibited higher activities for PFOA decomposition. The rate constant of pseudo-first-order kinetics for MIP-Ag/TiO2 NTs was 0.0055min(-1), which were much higher than that of other TiO2 materials. The great performance of MIP-Ag/TiO2 NTs were attributed to electron traps of Ag nanoparticles, and the footprint cavities formed by molecularly imprinted polymer. Shorter-chain PFCs were identified as main degradation products, and the PFOA degradation mechanism and pathway were proposed.

The "refereed" or "peer review" status of a journal comes from the Ulrichsweb Global Serials Directory (http://ulrichsweb.serialssolutions.com/), as supplied by the publisher. The term refers to the system of critical evaluation of manuscripts/articles by professional colleagues or peers. The content of refereed publications is sanctioned, vetted, or otherwise approved by a peer-review or editorial board. The peer-review and evaluation system is utilized to protect, maintain, and raise the quality of scholarly material published in serials. Publications subject to the referee process are assumed, then, to contain higher quality content than those that are not.
Peer Reviewed Journal Article

Electrochemical mineralization of perfluorooctane sulfonate by novel F and Sb co-doped Ti/SnO2 electrode containing Sn-Sb interlayer

Authors: Yang, Bo; Wang, J; Jiang, C; Li, J; Yu, G; Deng, S; Lu, S; Zhang, P; Zhu, C; Zhuo, Q (2017) HERO ID: 3981856

[Less] The F and Sb co-doped Ti/SnO2 electrode containing Sn-Sb interlayer was innovatively synthesized for . . . [More] The F and Sb co-doped Ti/SnO2 electrode containing Sn-Sb interlayer was innovatively synthesized for electro-oxidation (EO) removal of perfluorooctane sulfonate (PFOS) in water. Stronger oxidation capability and remarkably longer lifetime were performed for Ti/Sn-Sb/SnO2-F-Sb electrode than these similar electrodes in this study without Sn-Sb interlayer and F/Sb doping, which could removed more than 99% of PFOS (C-o = 100 mg L-1) after 120-min electrolysis. The attribute of Ti/Sn-Sb/SnO2-F-Sb anode and its EO mechanism-were surveyed by XRD, XPS, SEM, and LSV. F and Sb co-doping could improve the stability and EO capability of the electrode, which resulted from that the smooth surface was formed conveniently to produce physically adsorbed hydroxyl radical and lead to relatively high OEP. The operating parameters of EO process were also investigated including current density, pH value, and stirring speed, which revealed the effect of these parameters on PFOS decomposition. Additionally, the mineralization parameters, TOC and F- concentration, as well as short-chain perfluorocarboxylic acids were analyzed in solution during the electrolysis. Consequently, the EO pathway of PFOS was proposed through the detection of intermediates. These results manifest that Ti/Sn-Sb/SnO2-F-Sb anode is prospective to effectively decompose PFOS in wastewater. (C) 2017 Elsevier B.V. All rights reserved.