MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Dan Li,Chongning Li,Aihui Liang,Zhiliang Jiang
Fluoride constitutes an essential component for the formation of hard bones and teeth. However long-term excessive intake of fluoride causes chronic poisoning changes in the body. Therefore, the determination of its content is of great significance. Herein, a sensitive SERS quantitative analysis method was proposed to detect F − . Trace Fe 3+ exhibited strong catalysis of H 2 O 2 oxidizing 3, 3′, 5, 5′-tetramethylbenzidine (TMB) under the ultrasonic irradiation, and the reaction product called TMB diimine (TMB OX ) not only had strong fluorescence, but also had SERS activity in the silver nanosol substrate. Upon addition of fluoride ion (F − ), the stable complex of [FeF 6 ] 3− formed, and could inhibit the catalytic action of Fe 3+ , resulting in the SERS and fluorescence signal decreasing due to the TMB OX concentration decreasing. In the range of 2–1000 nmol/L F − , the SERS intensity Δ I decreased line with the concentration increased, with a detection limit of 0.7 nmol/L. Based on the catalytic amplifying strategy and the TMB OX molecular probes, ultratrace Fe 3+ could be also detected by SERS and fluorescence methods.
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高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Chao Yang,Na Han,Changye Han,Menglu Wang,Wenxin Zhang,Weijing Wang,Zongxuan Zhang,Wei Li,Xingxiang Zhang
Extremely asymmetric wettability, high wetting selectivity, instantaneous superwetting behaviors (low transmembrane resistance), and superior resistance to chemicals and solvents are needed for Janus membranes for switchable oil/water separation. However, it is still challenging to obtain Janus membranes with such properties. In this study, a surface with metastable hydrophobicity is constructed on one side of the chemically stable superhydrophilic TiO2@PPS membrane by adjusting the hydrophobization depth and the morphology of the hydrophobic layer via a water–oil interfacial grafting. The prepared Janus membrane exhibits a high water contact angle difference of ∼150° between its two surfaces with maintaining the superior penetrability of the original membrane, which makes it capable to separate both oil-in-water and water-in-oil emulsions with high fluxes and accuracy. The separation efficiency is higher than 98% for the separation of the two kinds of emulsions. The fluxes of the surfactant-free toluene-in-water and water-in-toluene emulsions are up to 6.4 × 102 and 9.5 × 102 L m–2 h–1, respectively. Furthermore, the Janus membrane exhibits desirable antifouling performance and reusability during usage.
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PubMed
高影响因子
CHEMOSPHERE
·
2018
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IF 4.427
Yongming Wu,Mi Deng,Yuanxiang Jin,Xiyan Mu,Xiaoli He,Nha-Thi Luu,Chunyan Yang,Wenqing Tu
6:2 chlorinated polyfluorinated ether sulfonate (F-53B) has been widely applied as a mist suppressant to replace perfluorooctane sulfonate (PFOS) in the metal plating industry in China for decades. Recently, F-53B has been frequently identified in the aquatic environment and wild-caught fish. However, studies on the uptake and elimination kinetics, and the toxicological effects of F-53B were very scarce. In this study, zebrafish larvae (72 h post fertilization, hpf) were exposed to F-53B (10, 100 μ g/L) for 48 h, followed by a 24 h of depuration to examine both the dynamics of accumulation and elimination of F-53B and responses of antoxidant defense system in fish. The results showed that F-53B rapidly accumulated in zebrafish larvae in a concentration and time-dependent manner with BCF values of 3612–3615, but was eliminated slowly (half-life ranged from 241.5 to 258.6 h). F-53B exposure induced oxidative stress in zebrafish larvae, as reflected by the reduction in the GSH and MDA contents, CAT, SOD, CuZn-SOD, and GSH-ST activities, and the increase in GSH-Px activity as well as CAT and SOD protein levels. However, these oxidative stress markers were restored to control levels except for a decrease in protein level of SOD after depuration. Collectively, the results of this work indicate that F-53B behaves like PFOS and is bioaccumulative and persistent in zebrafish larvae, and further induced oxidative stress responses.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 20
·7924-7929
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IF 8.262
Syed Comail Abbas,Kui Ding,Qin Liu,Yiyin Huang,Yakun Bu,Jing Wu,Jiangquan Lv,Muhammad Arsalan Ghausi,Yaobing Wang
The development of efficient oxygen reduction reaction (ORR) electrocatalysts composed of low cost and earth abundant elements is imperative for several energy systems. It has been reported that metal-free co-doped materials play a key role in the oxygen reduction reactions. However, a Si/F co-doped material has never been considered as an electrocatalyst for the ORR. Herein, we report a Si–C–F decorated three-dimensional porous carbon material by a facile pyrolysis of a mixture of D-glucose, ammonium fluoride and SiO2 nanoparticles in an argon atmosphere. It shows an excellent electrocatalytic performance with an onset potential of E = 0.24 V and a limiting current density of I = 4.5 mA cm−2 which is better than that of traditional electrocatalysts under neutral conditions. This outstanding electrocatalytic performance is due to the synergistic effect of silicon and fluorine which causes a change in the charge distribution and energetic characteristics of the Si–C–F decorated porous carbon material. For the practical application, a microbial fuel cell equipped with this electrocatalyst as the cathode reveals a high maximum power output and open circuit voltage (1026 mW m−2 and 780 mV), which are higher than those of commercial 20% Pt/C catalysts (913 mW m−2 and 750 mV).
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高影响因子
AQUATIC TOXICOLOGY
·
2024
·
IF 4.1
Peining Cai,Qi Li,Shuhui Wang,Liju Tan,Jiangtao Wang
A large number of nanoparticles are produced and enter the aquatic environment, where they interact with each other, posing a potential threat to aquatic organisms. The toxicity of two types of nanoparticles (nCu and nSiO 2 ) on Nitzschia closterium f. minutissima (N. closterium f. minutissima ) was investigated in this study by examining changes in microalgal cell density, instantaneous fluorescence rate (Ft), and a range of antioxidant parameters in the cells. It was found that both nCu and nSiO 2 showed time- and concentration-dependent toxic effects on N. closterium f. minutissima . nSiO 2 could promote microalgae growth at low concentrations by providing Si, an essential element for the synthesis of siliceous shells. As the exposure time increased, both the growth and photosynthetic efficiency of the microalgae were inhibited. Nanoparticles also produced oxidative stress and caused lipid peroxidation in the microalgae. In the meantime, SOD and CAT activity were altered to protect cells from oxidative damage. Inverted biomicroscopy images showed that the microalgae enhanced their cell size to adapt to the environmental stress as exposed to 1 mg/L nCu. Scanning electron microscope (SEM) images showed that 10 mg/L nSiO 2 could adsorb nCu and reduce the toxic effect of nCu on the microalgae, while 30 mg/L nSiO 2 caused mechanical damage to microalgal cells and accelerated the internalization of nanoparticles and Cu 2+ in the cells.
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PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yiwei Sun,Xiaoli Wei,Fangcao Liu,Bing Liu,Jiaming Zhao,Yubao Bi,Wenfeng Han
Developing effective techniques to produce and stabilize highly active metastable F-Al-O species in HFCs dehydrofluorination system without being over-fluorinated to Al-F is a major challenge. Herein, we report a new strategy for the formation and stabilization of metastable species. Using NaH 2 PO 4 as a P source, phosphoric acid groups are modified to the surface of Al 2 O 3 leading to the fabrication of AlPO 4 /Al 2 O 3 interface. P and Al 2 O 3 bond to form Al-O-P structure at the interface and stabilize F-Al-O in the dehydrofluorination system. Further studies show that AlPO 4 /Al 2 O 3 interface increase the oxygen vacancy content of catalyst and accelerate the conversion of HFC-152a on the catalyst surface. Meanwhile, AlPO 4 /Al 2 O 3 interface improves the surface acidity of Al 2 O 3 , endue a large number of Lewis weak acid sites, reducing the carbon accumulation of catalyst, and improving the stability of catalyst. The activity test showed that AlPO 4 /Al 2 O 3 interface shows high catalytic performance (74.2 %) and excellent stability (50 h) for 1,1-difluoroethane dehydrogenation compared with Al 2 O 3 (30 % and low stability) without P modification.
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Long Huang,Weihua Luo,Meiying Liu,Jianwen Tian,Qiang Huang,Hongye Huang,Junfeng Hui,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
The luminescent hydroxyapatite nanorods co-doped with Eu 3+ and F − (named as FAp:Eu 3+ ) were synthesized through liquid-solid-solution strategy to control their size and morphology as well as improve their fluorescence. However, these luminescent FAp:Eu 3+ nanorods are hydrophobic nature and cannot be directly used for biomedical applications. In this work, we developed a novel strategy for surface modification of FAp:Eu 3+ nanorods with the combination of the surface ligand exchange reaction and photo-initiated reversible addition-fragmentation chain transfer (photo-RAFT) polymerization using the biocompatible and hydrophilic poly(ethylene glycol) methacrylate (PEGMA) as the monomer. We demonstrated that the photo-RAFT polymerization is a facile and efficient route to fabricate hydrophilic FAp:Eu 3+ -polyPEGMA composites based on a series of characterization techniques. The FAp:Eu 3+ -polyPEGMA composites still well maintained the morphology and luminescent properties. Furthermore, the resultant FAp:Eu 3+ -polyPEGMA composites showed low cytotoxicity and desirable cell uptake behavior. These features suggested that the FAp:Eu 3+ -polyPEGMA composites are of great potential for biological imaging applications. More importantly, the photo-RAFT polymerization should be promising for preparation of many other luminescent nanocomposites owing to their advantages of photo-RAFT polymerization such as low polymerization temperature, high efficiency, absence of metal catalysts and good monomer applicability. It is therefore, the photo-RAFT could be extended for fabrication of many other multifunctional fluorescent composites for different biomedical applications.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Han Zhang,Yinyin Zhang,Luxiang Zhu,Yanan Liu
The frequent detection of 6:2 chlorinated polyfluorinated ether sulfonate (F-53B) in various environments has raised concerns owing to its comparable or even higher environmental persistence and toxicity than perfluorooctane sulfonate (PFOS). This study investigated the plasma degradation of F-53B for the first time using a water film plasma discharge system. The results revealed that F-53B demonstrated a higher rate constant but similar defluorination compared to PFOS, which could be ascribed to the introduction of the chlorine atom . Successful elimination (94.8–100 %) was attained at F-53B initial concentrations between 0.5 and 10 mg/L, with energy yields varying from 15.1 to 84.5 mg/kWh. The mechanistic exploration suggested that the decomposition of F-53B mainly occurred at the gas-liquid interface, where it directly reacted with reactive species generated by gas discharge . F-53B degradation pathways involving dechlorination , desulfonation , carboxylation , C-O bond cleavage , and stepwise CF 2 elimination were proposed based on the identified byproducts and theoretical calculations. Furthermore, the demonstrated effectiveness in removing F-53B in various coexisting ions and water matrices highlighted the robust anti-interference ability of the treatment process. These findings provide mechanistic insights into the plasma degradation of F-53B, showcasing the potential of plasma processes for eliminating PFAS alternatives in water.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 29
·42075-42087
·
IF 0
Zhang Qian,Lan Xin-yue,Huang Zhi,Liu Yan-ying,Hong Jun-ming
Highly active catalysts with salt and acid/alkali resistance are desired in peroxymonosulfate (PMS) activation processes and marine environment applications. F- and Cl-doped graphene (F-GN and Cl-GN) were prepared via electronegative and atom radius adjustment for tetracycline hydrochloride (TCH) pollution removal to satisfy these requirements. The introduction of special F and Cl functionalities into graphene exhibits superior electron transfer properties for PMS activation, considering the experimental and density functional theory (DFT) calculation results. The TCH degradation efficiency reached up to 80% under various pH and salt disturbance conditions with F-GN and Cl-GN. Cl-GN exhibited an activity superior to F-GN due to the higher electron polarization effect of C atoms adjacent to Cl atoms. The presence of more positive charged C sites in Cl-GN (around Cl doping) is more favorable for PMS attachment and sequence radical generation than F-GN. In addition, the main active species functionalized during reaction included ·OH and SO 4 − ·, and the stability of F-GN and Cl-GN was confirmed to be over 60% by recycle test. Final research results provide an effective strategy for designing and preparing PMS activators resistant to salt, acid, and alkali, thereby expanding their application potential.
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PubMed
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yanan Liu,Guangyan Wang,Shuaishuai Lu,Siqi Wang,Peijuan Jiang,Huan Chen,Fang Jiang
Pollution caused by per - and polyfluoroalkyl substances (PFASs) has raised global health concerns and there is an urgent need for researchers to find effective treatment methods. The covalent triazine framework (CTF) adsorbent materials with different structures based on various precursors using the ionothermal method were prepared and characterized in this study. Among them, F-doped CTF (F-CTF) is favorable for effective mass transfer in the adsorption process due to its rich microporous structure and large specific surface area. The maximum adsorption capacity (q max ) for PFOA reached 769.2 mg/g under the synergistic effect of electrostatic force and the interaction of F F. After six cycles of adsorption-desorption experiments, the adsorption and desorption rates of the F-CTF 400°C were stable at >90 %. This result indicates that F-CTF 400°C possesses high stability and recyclability. Furthermore, the desorption solution containing a high concentration of PFOA was treated directly by a UV/Na 2 SO 3 system, utilizing the e aq − within the system to decompose PFOA. The reduction and defluorination efficiencies for the desorption solution with high concentrations of PFOA reached 90 % and 40 %, respectively. The study results indicate that by leveraging the high adsorption selectivity and stable recoverability of F-CTF 400°C , the UV/Na 2 SO 3 system can completely remove PFOA. This approach offers a novel solution for the elimination of PFOA pollution in the environment.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Shaojin Jia,Sha Yang,Yu Pan,Salah Ud Din,Yuanjie Cai
As an important part of the fields such as renewable energy and electric vehicles, electrochemical energy storage technology faces significant challenges in improving energy density , extending battery life and improving safety. We successfully prepared a composite battery separator of polyvinylidene fluoride-chlorotrifluorinylene (PVDF-CTFE) and fluorinated polyimide (F-PI) -based materials, mixed it with different contents of boehmite nanoparticles , and then modified it by different doses of electron beam irradiation to improve the performance, especially to overcome the problem of maintaining capacity decline in high-speed charging environment. The results showed that the prepared battery separators exhibited outstanding thermal stability, electrochemical properties and ionic conductivity with 12 % boehmite nanoparticles . After 1000 high-speed charge and discharge cycles in current density of 10C, the battery based on the modified separator still maintained a capacity retention rate of 84.4 %, with the initial discharge specific capacity of 111.9 mAhg −1 . This means that irradiated separators not only maintain a high energy density in a high-speed charging environment, but also overcome the problem of maintaining capacity decline. Electron beam irradiation further improved the comprehensive performance of the separator. After 1000 and 1500 cycles at the current density of 10C and 15C, the specific discharge capacity of the battery can still retain more than 90 % and 80 % of the initial specific discharge capacity, which provides a longer life in practical applications.
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高影响因子
VACUUM
·
2024
·
IF 3.8
Zuhong Ji,Yunfei Sun,Xiaodong Guan,Yang Zhou,Junchao Qian,Feng Chen
In this work, the La substitution of iron and replacing the oxygen with fluorine are both adopted to expectantly enhance the rate performance and structure stability of LiFePO 4 during working. The characterizations of X-ray diffraction, scanning electron microscope , transmission electron microscope, charging-discharging tests, electrochemical impedance spectroscopy and safety tests are used to investigate the influences of La 3+ and F − doping on the LiFePO 4 . The results indicate the cathodes after La 3+ doping not only deliver the larger lattice parameters and unit cell volume to broaden the lithium ions migration pathway and accelerate the Li + diffusion speed, but also strengthen the whole bond energy of LiFePO 4 owing to the high bond energy of La–O. In addition, the F replacement of O could increase the length of Li–O bonds and decrease the length of P–O bonds, further be helpful to enhance the Li + diffusion between LiFePO 4 phase and FePO 4 phase due to the weakening of Li–O bonds. Finally, the La 3+ and F − co-doped cathode delivers the superior discharge capacity of 139.3 mAh g −1 at 5C high rate and 127.2 mAh g −1 at −20 °C, with the high discharging capacity of 160.1 mAh g −1 after 100 cycles at 45 °C.
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高影响因子
危险品化学品经营许可证（带存储）