JOURNAL OF CHEMICAL RESEARCH
·
2016
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IF 0.661
Haidong Liu,Bo Chen,Jin Cai,Junqing Chen,Min Ji
Eleven trifluoromethylated amines were synthesised in high yield (up to 98%) under metal-free and oxidant-free conditions using iminium salts as starting material and the addition of trifluoromethyltrimethylsilane in dimethylformide containing potassium fluoride.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2020
·
IF 6.479
Zhengqing Yang,Wen Sun,Lida Wang,Zhuang Wan,Jing Wang,Suilin Wang,Guichang Liu
Graphene is cathodic to most metals and can cause promoted corrosion to metals. Herein, we demonstrate that tuning oxygen reduction reaction (ORR) activity of graphene through fluorination modification is an effective strategy that can inhibit the corrosion-promotion activity of graphene. It is revealed that the cathodic ORR activity of partially fluorinated graphene (PFG) decreases with the increase of fluorine (F) content, which consequently increases the depolarization resistance of the cathodic ORR during corrosion. Especially, PFG containing 15.2 wt.% F exhibits a completely negligible corrosion-promotion activity. Furthermore, PFG can also improve the barrier property of polyvinyl butyral coating.
研究领域:
材料科学
·
电化学
·
防腐蚀研究
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2013
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IF 3.925
Zhou Song,Heqing Tang,Nan Wang,Lihua Zhu
A method for reductive degradation of perfluorooctanoic acid (PFOA) was established by using a sulfite/UV process. This process led to a PFOA removal of 100% at about 1 h and a defluorination ratio of 88.5% at reaction time of 24 h under N 2 atmosphere, whereas the use of either UV irradiation or SO 3 2− alone induced little defluorination of PFOA under the same conditions. It was confirmed that the reductive defluorination of PFOA was achieved by hydrated electrons being generated from the photo-conversion of SO 3 2− as a mediator. Theoretical reaction kinetic analysis demonstrated that the generation of hydrated electrons was promoted by increasing either SO 3 2− concentration or solution pH, leading to the acceleration of the PFOA defluorination. Accompanying the reduction of PFOA, a small amount of short-chain perfluorocarboxylic acids, less fluorinated carboxylic acids and perfluorinated alkyl sulfonates were generated, all of which were able to be further degraded with further releasing of fluoride ions. Based on the generation, accumulation and distribution of intermediates, hydrated electrons induced defluorination pathway of PFOA was proposed in a sulfite-mediated UV photochemical system.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Materials Interfaces
·
2018
·Vol. 6
·期 1
·1801330
·
IF 4.834
Muhammad Waqas,Shamshad Ali,Weiqiang Lv,Dongjiang Chen,Bismark Boateng,Weidong He
Highly efficient and thermally stable polyethylene-hexagonal boron nitride/poly(vinylidene fluoride-hexafluoropropylene) (PE-BN/PVDF-HFP) bilayer separator with microporous structure is prepared, for the first time with a wet chemistry method. The incorporation of hexagonal boron nitride particles in PE matrix promotes the interfacial interaction between PE and PVDF-HFP layers to prevent separation of layers and supresses dendrite growth owing to the strong adsorption energy with polymers, large interactive surface area, and superior mechanical capability. The PVDF-HFP layer provides additional thermally stable backbone while its inherent hydrophilic property and highly porous structure improve the overall performance of the separator. The bilayer separator owns a high electrolyte uptake of 348% and a thermal shrinkage of 6.6% upon annealing at 140 °C for 1 h. The lithium iron phosphate/lithium cell with the as-prepared separator owns a high ionic conductivity up to 4.4 × 10 −4 S cm −1 , and a room-temperature capacity of 120 mAh g −1 at 2 C with a 95% capacity retention after 500 cycles and a capability of 108 mAh g −1 at 4 C. The PE-BN/PVDF-HFP separator is a promising alternative of traditional multilayer separators for high-performance lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2022
·
IF 9.794
Delun Zhu,Jingchao Yuan,Tong Wang,Yang Dai,Yuqing Peng,Wenrong Li,Aijun Li,Jiujun Zhang
To improve the electrochemical performance of fluorinated carbon (CF x ) for lithium-fluorinated carbon batteries , the nitrogen and sulfur co-doped sub-fluorinated carbon cathode material (NS-sCF x ) is synthesized by a one-step method of heteroatom doping and defluorination . Experimental results confirm that nitrogen and sulfur elements are successfully doped on the surface of CF x material, and the surface fluorinated degree is reduced. DFT calculations and experimental results demonstrate that the heteroatoms co-doping and defluorination can generate a conductive interface, increase activation sites, and induce charge redistribution, producing a superior transfer rate of electrons and lithium ions . Hence, the NS-sCF x cathode material possesses excellent electrochemical properties , large specific capacity, high-rate performance, high power density, and no initial voltage delay. The Li/NS-sCF x battery delivers a specific capacity of 590.4 mAh·g −1 with a voltage plateau of 1.997 V at 20 C without initial voltage delay, corresponding to a power density is 35946 W kg −1 . Extraordinarily, an ultra-high power density of up to 107100 W kg −1 at 70 C is achieved without significantly initial voltage delay. This study reveals the functional mechanism of NS-co-doping and defluorination to improve the electrochemical performance of NS-sCF x material, which can be used as a reference for the design and development of related electrode materials .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Exposure and Health
·
2025
·
IF 4.6
Guo Jiaqi,Hu Zifan,Sun Weiyang,Li Jia,Huang Xinyi,Zhou Xianghong,Zhang Zilong,Jin Yuming,Huang Weichao,Luo Chunying,Harada Koji,Qiu Shi,Zou Xiaoli
Per- and polyfluoroalkyl substances (PFAS), as endocrine disruptors, may increase the risk of prostate cancer by interfering with the endocrine system, however, current population-based evidence is still limited, and there are relative few types of PFAS involved. This study aims to investigate the association between exposure to 18 kinds of PFAS and the incidence of prostate cancer in southwest China. In the case–control study, plasma samples from 97 PCa patients and 111 controls without a family history were analyzed using UPLC-MS/MS. The association between PFAS concentrations and prostate cancer was analyzed using Mann–Whitney U tests and Bayesian logistic regression. The detection limits of the proposed UPLC-MS/MS method ranged from 0.00070 to 0.30 ng/mL. The detection rate of most PFAS is greater than 75%, except for Perfluorodecanesulfonic acid (PFDS), Perfluorohexanoic acid (PFHxA), Perfluorohexadecanoic acid (PFHxDA), Perfluorooctadecanoic acid (PFODA), Perfluoropentanoic acid (PFPeA), Perfluorotetradecanoic acid (PFTeDA). Mann–Whitney U test results showed that differences in Perfluorobutanoic acid (PFBA), Perfluorohexanesulfonic acid (PFHxS), Perfluoroheptanesulfonic acid (PFHpS), Perfluorooctanesulfonic acid (PFOS), and Perfluoroundecanoic acid (PFUnDA) between the two groups were statistically significant, suggesting that exposure to these compounds may be associated with prostate cancer occurrence. Bayesian analysis showed no significant correlation for several PFAS, but Perfluorooctanoic acid (PFOA) [OR 2 ≥4.02 = 2.86, 95% CI 2 (1.64, 6.28)], Perfluorononanoic acid (PFNA) [OR 2 ≥1.61 = 3.82, 95% CI 2 (1.22, 16.08)], and PFUnDA [OR 2 ≥0.462 = 7.14, 95% CI 2 (1.12, 68.7)] demonstrated a positive correlation in high-concentration groups. Conversely, PFOS showed a negative correlation after adjustment [OR 2 ≥3.71 = 0.97, 95% CI 2 (0.87, 0.99)]. These results suggest a potential link between PFAS exposure and prostate cancer in the Chinese population, warranting further research.
研究领域:
环境科学
·
医学
·
流行病学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Xiaozhen Lu,Lin Wang,Xuewu Zhu,Jiashuai Wei,Daoji Wu,Liping Qiu,Daliang Xu,Heng Liang,Zhe Yang,Bin Liu
Efficient removal the hazardous per - and polyfluoroalkyl substances (PFAS) is imperative for healthy drinking water. The scalable and cost-effective nanofiltration (NF) process is considered the golden option for removing PFAS, but the inherent membrane structural properties usually induce unsatisfactory removals as well as low permeance. To overcome this challenge, we used the polar solvent ethanol (ETOH) as a co-solvent for the interfacial polymerization (IP) process to achieve precise modulation of the microstructural properties of NF membranes. The presence of ETOH enriched the piperazine (PIP) monomers on the organic side of the IP reaction zone, contributing to enhanced local reaction heat release and the formation of nanobubbles. Thus, a denser and less intruded substrate with a more homogeneous distribution of the nanobubble structure of the polyamide layer was achieved. Advantageously to the structural features, the preferred ETOH-4 NF membranes exhibited excellent permeability (17.54 LMH/bar) and selectivity (1821.45 bar -1 for water/Na 2 SO 4 and 180.67 bar -1 for NaCl/Na 2 SO 4 ). The ETOH-4 membrane demonstrates exceptional efficacy in the removal of 22 PFAS compounds, achieving removal rates ranging from 93.42 % to 99.99 %. Furthermore, it exhibits remarkable selectivity between water and PFAS substances. An in-depth analysis showed that the enhanced size exclusions were the main reason for the efficient removal of PFAS. This work provides a new route for customizing the microstructures of high-performance NF membranes for efficient PFAS removals.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Zhuoran Feng,Yaoxuan Fu,Jiahui Li,Xiangni Lu,Shuo Wang,Yidi Chen,Wei Wang,Zhiqiang Sun,Jun Ma
The UV/sulfite advanced reduction process (ARP) holds promise for the removal of per- and polyfluoroalkyl substances (PFASs) by a hydrated electron (eaq–)-induced H/F exchange process under anoxic conditions. Traditionally, the presence of coexisting nitrate in water has always been regarded as a major inhibitory factor for PFASs defluorination. However, this study observed an unexpected promotive effect of nitrate on defluorination, challenging the previous phenomenon. Notably, the addition of 100 μM nitrate resulted in a remarkable 54% enhancement in PFOA defluorination. A novel mechanism was discovered that nitrate-derived reactive nitrogen species (RNS) activated the decarboxylation–hydroxylation–elimination–hydrolysis (DHEH) process, an important degradation pathway for PFASs in UV/sulfite ARP. Induced by eaq–, the PFAS molecule first became a perfluorinated radical and then was transformed into unstable perfluorinated alcohol by reacting with water. Due to the high reactivity driven by unpaired electrons of RNS, water molecules were destabilized with the H–O bond stretched from 0.98 to 1.04 Å. This effectively enhanced the spontaneity of the reaction between perfluorinated radical and water molecules and consequently made the whole DHEH process more thermodynamic favorable (ΔG, −23.53 → −376.28 kJ/mol). Such a process breaks through the view that the nitrate directly reacts with eaq– to affect PFASs defluorination in ARP systems. This finding offers an innovative perspective for optimizing PFAS defluorination by strategically regulating nitrate levels in water bodies.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Marine Science
·
2024
·
IF 2.8
Lin Yuxin,Li Tiejun,Zhang Yurong
This study investigated the effects of levofloxacin (LEV) and norfloxacin (NOR) on Skeletonema costatum, focusing on cell growth, chlorophyll a (Chla) content, maximal quantum yield of PSII (Fv/Fm), protein content, enzyme activities of superoxide dismutase (SOD), glutathione reductase (GR), and glutathione peroxidase (GSH-PX), and the membrane lipid peroxidation product malondialdehyde (MDA) content were conducted to analyze the responses of S. costatum under LEV and NOR exposure. Cell growth, Chla content, Fv/Fm, protein content, enzyme activities, and MDA content were assessed to elucidate physiological changes. Both LEV and NOR inhibited S. costatum growth, except for 10 mg/L NOR, which promoted growth. Algal cells exhibited higher sensitivity to LEV, with 96h-IC50 values of 14.770 mg/L for LEV and 44.250 mg/L for NOR. Low NOR concentration (10 mg/L) increased Chla content, while high antibiotic concentrations (>20 mg/L for LEV, >100 mg/L for NOR) decreased Chla content and Fv/Fm, indicating an impact on photosynthesis. Elevated LEV and NOR levels reduced protein and MDA content but increased GR, SOD, and GSH activities, indicating induced oxidative stress. The study provides a comprehensive analysis of LEV and NOR effects on marine microalgae growth and underlying physiological mechanisms, shedding light on potential ecological risks posed by antibiotics in marine ecosystems.
研究领域:
海洋生物学
·
环境科学
·
生态毒理学
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Engineering
·
2025
·
IF 6.7
Yuwen Qi,Fuyu Li,Chunhui Zhang,Xuejiao Tang,Cuiping Wang,Yanna Liang,Hongwen Sun,Baoshan Xing
Severe harmful effects of per-fluoroalkyl and polyfluoroalkyl substances (PFAS) to ecology and human health have led many countries to continuously upgrade their control for PFAS, which poses higher requirements for the efficient removal of PFAS in water to ensure water resource security. In the present study, the three-dimensional/two-dimensional (3D/2D) structure of metal oxide immobilized on a carbon substrate of the Fe-based metal–organic frameworks (Fe-MOF) heat treatment derivative H:MIL-101(Fe) was constructed. H:MIL-101(Fe) could completely remove PFOA from pure water within 5 min, and complete recovery was achieved within 30 s. H:MIL-101(Fe) exhibited stable properties and can maintain its initial adsorption percentage after four cycles of PFAS adsorption. It was found that the high hydrophobic interface of H:MIL-101(Fe) was formed by partial carbonization during the Fe-MOF heat treatment, and a large number of unsaturated ═C–H bonds on the unstructured benzene ring were generated. Furthermore, cationic chelating agent, such as cetyltrimethylammonium bromide, were mixed with PFAS to synthesize more hydrophobic long-chain complexes; six PFAS containing 4–8 carbon atoms could be completely coadsorbed in surface water within 10 min at pH 7.0, mainly depending on the mechanism of hydrophobic interaction. This study develops a novel adsorption material that can match PFAS types to realize the effective coadsorption of PFAS in water, which provides new insights for removal of PFAS with different carbon chains based on improving hydrophobic interactions between adsorbents and adsorbates.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Baoxin Wang,Hongxing Ye,Baiyi Chen,Pengjiao Zu,Guizhen Lu,Li Ma,Haibing Zhang,Mingxian Sun,Yuanjie Li,Hongyi Liu,Jianhua Wu
Bioinspired slippery surfaces have garnered significant attention as promising solutions to mitigate biofouling. Unlike traditional lubricant-infused porous surfaces, recent research has focused on the integration of lubricants within polymer brush-grafted surfaces. The combination of polydimethylsiloxane (PDMS) polymer brush and silicone oil has gradually become the most prevalent choice due to their outstanding chemical affinity. However, this conventional coating system also has the potential for improvement to meet the needs of long-lasting and efficient marine antifouling, including i) precisely designing the polymer brush’s chemical structure to match the polarity of a specific lubricant enhances their chemical affinity, and ii) appropriately reduce the coating system’s surface energy to improve the fouling desorption performance. Here, we introduce a systematically engineered polymer brush/lubricant coating system that incorporates fluorinated polysiloxane and perfluoropolyether fluid. This novel coating system exhibits enhanced adhesion strength coupled with reduced surface energy, resulting in superior stability and omniphobic properties. Additionally, it showcases excellent corrosion resistance and significantly deters marine microorganism adhesion, achieving reductions of 98.8 % for P. tricornutum and 99.8 % for Bacillus sp. . Marine field trials, conducted over a 90-day static immersion period, confirm the remarkable antifouling performance, which surpasses most existing slippery coatings. Moreover, under dynamic conditions, organisms adhering for 150 days are readily dislodged by shear force. These findings underscore the pivotal role of systematic design in polymer brush/lubricant coating systems for the advancement of high-performance slippery surfaces tailored for marine antifouling applications.
研究领域:
材料科学
·
海洋生物学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Ting Liu,Bolu Sun,Chunyan Sang,Hua Cai,Hong Liu,Yuwei Liu,Gengsheng He
In the current work, a modified glassy carbon electrode (GCE) with excellent conductivity was prepared by drop-coating carboxymethyl cellulose (CMC) and multiwalled carbon nanotubes (MWCNTs) on the GCE surface. On this basis, two highly selective molecularly imprinted sensors (MIP@PFDA/modified GCE and MIP@PFOS/modified GCE) were separately obtained by in situ electropolymerization of o-phenylenediamine (o-PD) with perfluorodecanoic acid (PFDA) and perfluorooctanesulfonic acid (PFOS) as templates. Under optimal conditions, sensitive quantification methods in the linearity ranges 0.1–1000 ng/mL (PFDA) and 0.05–900 ng/mL (PFOS) were developed via differential pulse voltammetry using [Fe(CN)6]3–/4– as a redox probe. The detection limit values of PFDA and PFOS were as low as 0.041 and 0.015 ng/mL, respectively. Both sensors also presented great stability and selectivity in coexistence with other interferences. Lastly, three food samples were utilized to verify the validity and applicability with recoveries of 89.97%–112.27%, confirming its potential for per- and polyfluoroalkyl substances (PFASs) monitoring in a complex matrix.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）