Materials Research Express
·
2019
·Vol. 6
·期 8
·086417
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IF 1.449
Xueting Wang,Yanhua Yuan,Lei Chen,Zhanxiong Li
In this study, two novel perfluoroalkylsilane monomers with branched bisfluoroalkyl moieties were synthesized via Radical Addition and Hydrosilylation. Their structure was characterized by FT-IR and 1H NMR Fluoroalkyl-terminated self-assembled monolayers (SAMs) on silanol-terminated silicon substrates were chemically fabricated via –Si–O– covalent bonding with the liquid phase deposition method (LPD). The wettabilities of the SAMs were characterized by Water Contact Angles (WCA) and surface free energies measurements. X-ray Photoelectron Spectroscopy (XPS) was used to validate the attachment, together with the chemical composition of the SAMs on the silicon substrate. The surface morphologies and roughness of the monolayers were obtained through Atomic Force Microscopy (AFM). It was found that the SAMs of perfluoroalkylsilane has higher contact angle and lower surface energy after heat treatment as the migration of fluoroalkyl groups to the outermost surface of the SAMs because of the surface microphase separation. Besides, on account of the strong π-π bonding between phenylene bridged group, the perfluoroalkylsilane monomer containing phenylene group exhibited denser structure and then the hydrophobicity of SAMs can be improved to some extent.
研究领域:
材料化学
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表面科学
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Wei Liu,Tao Lin,Xue Zhang,Fuchun Jiang,Xiaoshu Yan,Han Chen
The safety threat posed by Perfluoroalkyl acids (PFAAs) in drinking water is a growing concern. In this study, we loaded chitosan (CS) on granular activated carbon (GAC) to adsorb PFAAs, and we explored the role of nanobubbles in the adsorption process through experiments and density functional theory (DFT) calculations. Compared with GAC, we found that the use of the composite adsorbent (CS/GAC) enhanced the removal rate of perfluorooctanoic acid by 136% with the assistance of nanobubbles. PFAAs with different chain lengths have different adsorption mechanisms owing to surface activity differences. PFAAs with longer C–F chains can be directly enriched with amino groups on the CS or air–water interface on composite adsorbents. Additionally, PFAAs can be enriched with nanobubbles in solution to form nanobubble–PFAA colloids, which are adsorbed by protonated amino groups on CS through electrostatic interactions. We found that PFAAs with shorter C–F chains are less affected by nanobubbles, and DFT calculations indicated that the adsorption of short-chain PFAAs is mainly affected by electrostatic interactions. We also proved that the electrostatic interactions between CS and PFAAs are mainly derived from the abundant protonated amino groups.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2022
·
IF 4.601
Zhenzhen Huang,Peng Liu,Xia Lin,Yudong Xing,Yan Zhou,Yuehua Luo,Hian Kee Lee
Perfluoroalkyl and polyfluoroalkyl substances (PFASs) have raised serious public health concerns because of their potential adverse effects in humans as revealed by toxicological and epidemiological research. However, routine monitoring of PFASs is still challenging due to their trace levels in various environmental and biological matrices. In this study, magnetic composite materials based on iron (II, III) oxide (Fe 3 O 4) with surface functionalization by cucurbit(n)uril (CB(n)) (Fe 3 O 4 @CB(n)) ( n = 6, 7, 8), were prepared and evaluated as new adsorbents for the magnetic solid-phase extraction of nine PFASs in lake water, tap water and fish muscle samples. The Fe 3 O 4 @CB(n) was characterized to examine their surface morphologies, sizes magnetism and thermal stability. Featuring good aqueous solution dispersibility, the macrocyclic structure of Fe 3 O 4 @CB(n) was also endowed with strong host-guest interactions, allowing extraction and enrichment capability towards the PFASs in complex matrices. MSPE using Fe 3 O 4 @CB(7) combination with ultra-high performance liquid chromatography coupled to Orbitrap high-resolution mass spectrometry, gave satisfactory quantitative analytical performance with low limits of detection of 0.004–0.04 µg L − 1 and limits of quantification of 0.005–0.1 µg L − 1 , linearities ranging from 0.01 to 10 µg L − 1 with high coefficients of determination (R 2 ≥ 0.993), and enrichment factors (15–76) for the nine target PFASs. The method proved to be effective for the enrichment and analysis of trace levels of PFASs in genuine environmental water and fish muscle samples, indicating that Fe 3 O 4 @CB(7) has promising applicability as an adsorbent for these contaminants.
研究领域:
环境科学
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分析化学
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材料科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY
·
2025
·
IF 2.8
Shi Si,Zhang Zijie,Wang Rong,Xue Shiji,Fei Wanyu,Peng Yue’e
In this study, a detailed analysis of 20 per- and polyfluoroalkyl substances (PFAS), including 13 perfluorocarboxylic acids (PFCAs) (C4–C18), four perfluorosulfonic acids (PFSAs) (C4, C6, C8, C10), and three polyfluoroalkyl substances, in different environmental media of Fu River, which was the main sewage storage body, and located near the Tianhe Airport in Wuhan, China. In the surface water samples, short-chain PFAS, perfluorobutanesulfonic acid (PFBS) and perfluorobutanoic acid (PFBA) were the most prevalent, and highest concentrations of 168 ng/L and 49.7 ng/L, respectively. However, in the sediment samples, PFBS and perfluorooctane sulfonate (PFOS) were the most prevalent, and highest concentrations of 840 ng/kg and 1510 ng/kg, respectively. Meanwhile, PFOS was the most prevalent substance, with the highest concentrations measured at 23.3 μg/kg in egg yolk and 28.1 μg/kg in fish, accounting for proportions of 82% and 88%, respectively. Two new short-chain substitutes of PFOS, 6:2 clorinated polyfluoroalykyl ether sulfonate (6:2 Cl-PFESA) and 8:2 clorinated polyfluoroalykyl ether sulfonate (8:2 Cl-PFESA), emerged in sediment and fish. The PFAS in eggs, fish, and vegetables of Fu River Basin poses a potential health risk to residents according to the suggested value of the European Food Safety Agency.
研究领域:
环境科学
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毒理学
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产品关联
DOI
PubMed
高影响因子
Canadian Journal of Chemistry
·
2018
·Vol. 97
·期 2
·
IF 1.084
Lei Chen,Yanhua Yuan,Zhanxiong Li
In this study, three types of fluorinated polyacrylates (PBFB, PBFS, and PMFA) were synthesized by 4-gem-bis(2,2,3,3,4,4,5,5,5-nonafluoropentyl)-1-butene, 4-gem-bis(2,2,3,3,4,4,5,5,5-nonafluoropentyl)-methine-1-styrene, and 3,3,4,4,5,5,6,6,6-nonafluorohexyl acrylate, respectively, as monomers via emulsion polymerization. Particle size, particle size distribution, and zeta potential were tested to assess the emulsion stability. Afterwards, the latexes were coated onto fabrics to obtain gem-bis(fluoroalkyl)-cotton. The surface properties of the treated cotton fabrics were analyzed by X-ray photoelectron spectroscopy and water contact angle. It was found that, when controlling the fluorine content level to be similar, the water contact angles of gem-bis(fluoroalkyl)-cottons were 127° ± 0.5° and 134.9° ± 0.7°, respectively, which were both higher than that of mono-fluoroalkyl-cotton (PMFA-cotton of 125.2° ± 0.2°). This showed that gem-bis-fluoroalkyl groups could provide better hydrophobic performance than the mono-fluoroalkyl group, especially when the rigid benzene was used as a side-chain bridged group.
研究领域:
材料科学
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纺织工程
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产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Chushan Huang,Jiaji Zhang,Guocheng Hu,Lijuan Zhang,Haibo Chen,Dongyang Wei,Dan Cai,Yunjiang Yu,Xin Li,Ping Ding,Jing Li
Previous studies of perfluorinated alkyl substances (PFASs) in receiving water bodies of typical industrial parks under the low-carbon development mode are scarce. In the present study, 18 PFASs were analyzed in surface water and sediment samples of the inland river basin in Longgang District in 2017. The ΣPFAS concentrations in surface water (drought and rainy periods) and sediment ranged from 15.17 to 948.50 ng/L, 11.56–561.14 ng/L, and 1.07–28.94 ng/g dw, respectively. Perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorobutane sulfonate (PFBS) were the dominant pollutants in surface water, with maximum concentrations of 867.68 ng/L, 288.28 ng/L, and 245.09 ng/L, respectively. Meanwhile, PFOS, perfluoroundecanoic acid (PFUdA), PFBS, and perfluorodecanoic acid (PFDA) were the major PFASs in the sediment samples, with maximum concentrations of 9.83 ng/g dw, 11.86 ng/g dw, 5.30 ng/g dw, and 5.23 ng/g dw, respectively. In addition, PFOA and PFOS resulted from similar sources in sediment and surface water samples ( P < 0.05). The risk quotient value (RQ) results showed that the control of PFOS in the treatment of pollutants in the inland river basin of Longgang District deserves more attention.
研究领域:
环境科学
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污染生态学
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Shan Yao,Jieying Lin,Shaoxiong He,Yang Bai,Mingge Jin,Feng Zhu,Jingyun Fang,Mengye Wang
Perfluoroalkyl substances (PFAS) are environmentally persistent, bioaccumulative and toxic pollutants. However, thorough degradation of PFAS remains exceptionally difficult due to the high dissociation energy of the C-F bond. Here, we report a viable strategy to markedly degrade PFAS completely by capitalizing on a harmless polytetrafluoroetylene (PTFE) as a piezocatalyst. Remarkably, perfluorooctanoic acid (PFOA), as one of the widely used PFAS, was almost completely removed with a degradation rate of 93.4 % and a defluorination rate of 91.5 % by the ultrasound excitation of PTFE for 1 h. On the basis of the intermediate analysis, we proposed an oxidation mechanism for the piezocatalytic PFOA degradation. Furthermore, this strategy was also efficient for the degradation of perfluoroheptanoic acid (PFNA), perfluorooctane sulfonate (PFOS) and hexafluoropropylene oxide dimer acid (Gen-X), implying its effectiveness to remediate water containing multiple PFAS. Impressively, due to the diverse energy gap between HOMO and LUMO energy of various PFAS, the degradation reaction kinetics of different PFAS are of significant difference. This study provides the deep insight into the piezocatalytic technique for the remediation of persistent and disparate PFAS.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Bo Yang,Yanni Han,Gang Yu,Qiongfang Zhuo,Shubo Deng,Jinhua Wu,Peixin Zhang
Electrocoagulation (EC) technique was used to investigate the removal performance of aqueous perfluoroalkyl acids (PFAAs) with relatively high concentration as simulating the wastewater from organic fluorine industry. A comparison between iron and aluminum electrode was made to remove PFAAs with the similar electrolysis condition. Effective removal of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA) was obtained by EC process, especially for Fe anode. Several key factors were studied to optimize the EC process using Fe electrode. At the optimal operating parameters including 25.0 mA/cm 2 of current density, 180 rpm of stirring speed, and 2 g/L NaCl as supporting electrolyte, more than 99% of PFOS could be removed with 0.25 mM of initial concentration after 50-min electrolysis. Additionally, the adsorptive removal of aqueous PFOS on iron hydroxide flocs during EC was also verified by Fourier transform infrared spectra. The investigation of removal efficiency for PFAAs with different carbon chain length after EC and the characteristic of zeta potential on Fe flocs indicated that the electrostatic adsorption was primarily responsible for the PFAAs sorption on the iron hydroxide flocs.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Dandan Zhao,Mingwang Pan,Jinfeng Yuan,Hui Liu,Shaofeng Song,Lei Zhu
s Although recent progress has been made in the development of superamphiphobic fabrics, durability has been an obstacle to their wide application in practice. In this work, a robust water-borne superamphiphobic coating was successfully prepared using poly(vinylidene fluoride) (PVDF) latex particles (225 nm) modified with a cationic fluorocarbon surfactant (Zonyl 321) and an fluoroalkylsilane (FAS). It is demonstrated that the superamphiphobic coating could strongly adhere to various substrates (fabric, sponge, wood, and filter paper) to efficiently repel water and hexadecane under harsh environments such as strong ultraviolet (UV) irradiation, abrasion, plasma cleaning, boiling water, and strong acid/base corrosion. Furthermore, this coating could exhibit good thermal healing capability upon thermal annealing. Through a thorough study of the self-assembly structure of the composite PVDF/Zonyl 321/FAS particles, the robust superamphiphobic property was considered to relate to the following reasons. First, PVDF latex particles provided nanoscale roughness and good UV/chemical resistance. Second, cationic Zonyl 321 self-assembled onto negatively charged PVDF latex particles to form a shell structure with inner fluoroalkyl groups protected by the outer positive charges, which could provide strong adhesion to various fabrics. Third, FAS self-assembled into the fluoroalkyl shell and subsequent self-condensed to render a lightly crosslinked structure. After forming a dense coating onto a substrate, further crosslinking via self-condensation of FAS provided robustness for the coating. Subsequent thermal annealing at 130 °C drove the fluoroalkyl side chains to accumulate at the top surface for superamphiphobicity. This understanding of the composite PVDF/Zonyl 321/FAS system will help us design even better superamphiphobic coatings in the future.
研究领域:
材料科学
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表面化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 131
·期 2
·
IF 1.395
Jinsu Xiong,Lei Xia,Baoqing Shentu,Zhixue Weng
The fluoroalkyl-modified polyester (PE-F n ) was synthesized by the reaction of polyester resin (PE) and fluorinated isocyanate, and the structure of the synthesized product was characterized by proton nuclear magnetic resonance ( 1 H-NMR) and fluorine nuclear magnetic resonance ( 19 F-NMR). The water and oil wettability of the cured PE coatings with PE-F n as additives was investigated by contact angle meter. The results showed that the introduction of an extremely low concentration of PE-F n into PE led to the increase in contact angle of water and diiodomethane on cured PE coatings, and the decrease in the surface free energy. The X-ray photoelectron spectroscopic (XPS) analysis showed that the F/C molar ratio in the outer few nanometers was significantly higher than that in the bulk, indicating that the fluoroalkyl groups in PE-F n had enriched on the coating surface. It was also found that longer fluoroalkyl groups and fluoroalkyl groups with CF 3 at its end had the higher tendency to aggregate on the coating surface. The topological structures of the cured coatings were recorded by an atomic force microscope under tapping mode and the results revealed that there was a strong surface segregation of fluorinated species. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39812.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF FLUORINE CHEMISTRY
·
2024
·
IF 1.7
Ye-lin Liu,Xiao-Yu Geng,Min Jiang,Jin-Tao Liu
The perfluoroalkylthiolation reactions of thiols with perfluoroalkanesulfenic acids were achieved without adding any additives, giving a series of unsymmetric disulfides in good to excellent yields. After simple removal of solvent from reaction system under reduced pressure, most products could be obtained with high purity. The reaction tolerates both aryl and alkyl thiols and has advantages such as easy-to-handle, additive-free and simple separation procedure.
研究领域:
有机化学
·
合成化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 6
·3193-3201
·
IF 3.591
Lianglin Zhang,Shuwei Lin,Yi Li,Baozong Li,Yonggang Yang
Four Ala–Ala dipeptides with a semi-perfluoroalkyl chain were synthesized. The intermolecular hydrogen bonding among amide groups and carboxyl groups as well as the hydrophobic association of semi-perfluoroalkyl chains drove the self-assembly of dipeptides. Homochiral dipeptides were able to self-assemble into coiled nanoribbons in a mixed solvent of DMSO/H2O (5/5, v/v), while entangled twisted nanofibers formed for heterochiral ones in a mixed solvent of DMSO/H2O (4/6, v/v). The handedness of self-assemblies and the stacking chirality of phenylene groups were controlled by the chirality of the alanine residue at the C-terminal. The vibration circular dichroism investigation indicated that the helicity of the semi-perfluoroalkyl chain was controlled by the handedness of dipeptide self-assemblies. The X-ray diffraction study showed that homochiral and heterochiral dipeptides underwent distinct molecular packing during the self-assembly. Our results clearly demonstrated that, through supramolecular self-assembly, the chirality transferred from the amino acid building block to the self-assemblies and eventually to the semi-perfluoroalkyl chain.
研究领域:
生物化学
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材料科学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）