ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Mingzhu Hu,Jinyi Zhu,Wenjun Zhou
Oxygen vacancy-enriched N/P co-doped cobalt ferrite (NPCFO) was synthesized using ionic liquid as N and P sources, and then the catalytic performance and mechanism of NPCFO upon peroxymonosulfate (PMS) activation for the degradation of organic pollutants were investigated. The as-synthesized NPCFO-700 exhibited excellent catalytic performance in activating PMS , and the degradation rate constant of 4-chlorophenol (4-CP) increased with the increase of OV concentration in NPCFO-x. EPR analysis confirmed the existence of · OH, SO 4 ·- , and 1 O 2 in the NPCFO-700/PMS system, in which OV could induce the generation of 1 O 2 by PMS adsorption and successive capture, and also served as electronic transfer medium to accelerate the redox cycle of M 2+ /M 3+ (M denotes Co or Fe) for the generation of radical to synergistically degrade organic pollutants. In addition, the contribution of free radical and nonradical to 4-CP degradation was observed to be strongly dependent on solution pH, and SO 4 ·- was the major ROS in 4-CP degradation under acid and alkaline condition, while 1 O 2 was involved in the degradation of 4-CP under neutral condition due its selective oxidation capacity, as evidenced by the fact that such organic pollutants with ionization potential (IP) below 9.0 eV were more easily attacked by 1 O 2 . The present study provided a novel insight into the development of transition metal-based heterogeneous catalyst containing massive OV for high-efficient PMS activation and degradation of organic pollutants.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Mingquan Liu,Yingying Jiao,Junchao Qin,Zhongjun Li,Jianshe Wang
Nonmetals doping are effective for adjusting the electronic and molecular structures of C 3 N 4 nanosheets (CN), which could broaden the range of visible light response and improve the photo-induced electron-hole separation. Here a series of nonmetals (S, P, F and Br) doped C 3 N 4 nanosheets (x-CN) decorated with boron doped C 3 N 4 nanodots (BCNDs) was prepared for the first time. Compared with the pristine nonmetals doped CN, the integrating of BCNDs with x-CN can effectively facilitates the charge separation and transfer in the photocatalytic process, and endows enhanced photocatalytic activity for hydrogen production. The maximum photocatalytic hydrogen production rate of the BCNDs/S-CN, BCNDs/P-CN, BCNDs/F-CN and BCNDs/Br-CN composite can reach 3924.81 μmol·g −1 ·h −1 , 2387.62 μmol·g −1 ·h −1 , 2374.06 μmol·g −1 ·h −1 and 3471.56 μmol·g −1 ·h −1 respectively, which is about 3.3, 4.3, 4.0 and 3.1 times that of their counterparts, respectively. This work demonstrates that BCNDs plays an important role to improve the photocatalytic properties by forming 0D/2D isotype heterojunction with nonmetals doped C 3 N 4 nanosheets and provides new members for heterojunction photocatalysts, which is conductive to further fundamental and applied research.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Qinqin Luo,Yulin Sun
To leverage strong P/N synergistic effects to impart high flame retardancy to epoxy resin without compromising overall performance, a novel flame retardant, 6-(pyrimidin-2-ylamino)dibenzo[c,e][1,2]oxaphosphinine 6-oxide (DAP), was synthesized by forming a P–N bond between 9,10-dihydro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO) and 2-aminopyrimidine. Its structure was confirmed by NMR and mass spectrometry. Non-isothermal DSC tests demonstrated that DAP acted as a co-curing agent with 4,4′-diaminodiphenylmethane for diglycidyl ether of bisphenol-A and enhanced the curing rate. DAP significantly enhanced the flame retardancy of the epoxy resin at a low loading of 4 wt% (0.40 wt% phosphorus), achieving a limiting oxygen index (LOI) of 32.1% and a UL-94 V-0 rating. It also reduced heat and smoke release. The results from dynamic mechanical analysis (DMA) and mechanical property tests showed that the epoxy resin containing 4 wt% DAP retained a glass transition temperature comparable to the neat resin, along with slight improvements in mechanical properties, including flexural strength and modulus, non-notched impact strength, and tensile strength. The analyses of UL-94, cone calorimetric test (CCT), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis/infrared spectroscopy (TGA/IR), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) revealed that the flame-retardant mechanism involved both a condensed-phase char barrier and gas-phase quenching and dilution effects.
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高影响因子
WORLD JOURNAL OF MICROBIOLOGY & BIOTECHNOLOGY
·
2017
·Vol. 33
·期 2
·1-9
·
IF 1.658
Zhang Jian-Fen,Chen Wei-Qing,Chen Hong
In this study, we report the cloning and expression of a functional glucoside 3-dehydrogenase (G3DH) gene from Sphingobacterium faecium ZJF-D6. This gene is 1686 bp in length and encodes a peptide of 562 amino acids. The G3DH gene was successfully expressed in E. coli , and the recombinant enzyme could oxidize glucosides, galactosides and analogues at C-3 position. The sequence and multiple alignment analysis showed that the enzyme has highest identity with G3DHs from Paraglaciecola polaris LMG 21857, Aliiglaciecola lipolytica E3 and Halomonas sp. alpha-15. The recombinant G3DH was purified on Ni–NTA column and exhibited the highest activity at pH 7.6 and 30 °C. It was sensitive to acid and alkali, and showed well thermostability. The SfG3DH could oxidize a wild range of sugars. When recombinant E. coli BL21 cells were used as catalyst, a high rate of conversion to N- p -nitrophenyl-3-ketovalidamine was achieved, and no p -nitroaniline was detected. This process offers a promising approach to fulfill substrate of 3-ketovalidoxylamine A C–N lyase production.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yuan-Bin Chen,Siyi Xiong
This article explores the microwave dielectric properties of (La 1-x Nd x ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 (x=0.1,0.3,0.5, and 0.7) ceramics prepared by solid-state reaction. Utilizing the Rietveld refinement technique in XRD, the sample is identified as a trigonal crystal system belonging to the R 3 ¯ c space group. SEM analysis indicates that relative density has a significant impact on the ε r and Q×f of ceramics. The Q×f values of ceramics are closely related to the FWHM of the Raman spectra. At 750℃, (La 0.5 Nd 0.5 ) 2 (Zr 0.96 Ti 0.04 ) 3 (MoO 4 ) 9 ceramic exhibited excellent dielectric properties: ε r = 10.4 (±0.08), Q×f = 149,300 (±3211) GHz, τ f = −34.8 (±0.7) ppm/℃. To gain a deeper understanding of the intrinsic mechanisms governing the microwave dielectric properties of ceramics, analysis based on the P-V-L theory reveals that the La(Nd)-O bond and Mo-O bond contribute significantly to ε r and Q×f, respectively.
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高影响因子
Small
·
2019
·Vol. 16
·期 2
·1905301
·
IF 10.856
Zhibin Yi,Ying Liu,Yingzhi Li,Liangjun Zhou,Zhenyu Wang,Jianqiao Zhang,Hua Cheng,Zhouguang Lu
Rechargeable potassium-ion batteries (PIBs) have attracted tremendous attention as potential electrical energy storage systems due to the special merit of abundant resources and low cost of potassium. However, one critical barrier to achieve practical application of PIBs has been the lack of suitable electrode materials. Here, a novel flexible membrane consisting of N, P codoped carbon nanofibers decorated with MoP ultrafine nanoparticles (MoP@NPCNFs) is fabricated via a simple electrospinning method combined with the later carbonization and phosphorization process. The 3D porous CNF structure in the as-synthesized composite can shorten the transport pathways of K-ions and improve the conductivity of electrons. The ultrafine MoP nanoparticles can guarantee high specific capacity and the N, P co-doping could improve wettability of electrodes to electrolytes. As expected, the free-standing MoP@NPCNF electrode demonstrates a high capacity of 320 mAh g −1 at 100 mA g −1 , a superior rate capability maintaining 220 mAh g −1 at 2 A g −1 , as well as a capacity retention of more than 90% even after 200 cycles. The excellent rate performance, high reversible capacity, long-term cycling stability, and facile synthesis routine make this hybrid membrane promising anode for potassium-ion batteries.
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高影响因子
Materials Today Energy
·
2021
·
IF 7.311
J. Yang,F. Mo,L. Huang,H. Liang,G. Sun,S. Peng
Black phosphorus/natural graphene (BP/NG) composite electrode material for all-solid-state lithium-ion batteries (ASSLIBs) was fabricated by a facile ball milling method. A C-P bond with characteristics of high ion and electron transfer was constructed, which unlocked the reversible cycling and rate performance of phosphorus. In addition, compounding black phosphorus (BP) with natural graphene (NG) can relieve the large internal stress caused by volume change during cycling and improve the stability of the long cycling and high-rate performance. At current density of 0.5 A g −1 , a high specific capacity of 750 mAh g −1 remained after 100 cycles, whereas at high current density of 1 A g −1 , the BP/NG anode material delivered a reversible capacity of ~300 mAh g −1 . Furthermore, the reaction controlling step of Li x P delithiation was revealed by kinetic measurement. In addition, when coupling BP/NG anode material with TiS 2 to assemble a full solid-state cell, it delivered a high capacity of 400 mAh g −1 after 30 cycles, indicating a potential of further application. This work expanded the candidate of anode materials for ASSLIBs and provided aid for the further application of all-solid-state batteries.
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高影响因子
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Bing Xie,Qi Zhang,Haibo Zhang,Guangzu Zhang,Shiyong Qiu,Shenglin Jiang
Uniform morphology BaTiO 3 nanowires with high aspect ratio (>100) were synthesized via a novel stirring hydrothermal method . The BaTiO 3 /P(VDF-CTFE) nanocomposite films were prepared by a simple solution casting method using dopamine modified BaTiO 3 nanowires as nanofillers and ferroelectric polymer P(VDF-CTFE) as matrix. A maximum dielectric displacement of 9 μC/cm 2 under the electric field of 3000 kV/cm was achieved for the nanocomposites with 3 vol% BaTiO 3 nanowires. These nanocomposites with dopamine modified BaTiO 3 nanowires also exhibit an enhanced energy density of 8.4 J/cm 3 at a relative low electric field of 2700 kV/cm. This energy density is 55% higher than that of the pure P(VDF-CTFE) (−5.4 J/cm 3 at 3600 kV/cm). Such significant enhancement in dielectric displacement and energy density is attributed to the combined effects of both surface modification by dopamine and the high aspect ratio of the BaTiO 3 nanowires. Our study has a promising commercial potential in practical application in the automobile and aerospace field, which require greater energy density with a lower operating voltage.
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高影响因子
DESIGNED MONOMERS AND POLYMERS
·
2012
·
IF 1.444
Shanyin Yan,Wenqiu Chen,Wei Yan,Mingfu Huang,Chuan Chen,Zushun Xu,Kelvin W. K. Yeung,Changfeng Yi
A novel pyridine-containing aromatic diamine monomer, 4-(4-trifluoromethylphenyl)-2,6-bis[3-(4-aminophenoxy)phenyl]pyridine (m,p-3FPAPP), was successfully synthesized by a modified Chichibabin reaction of 4-trifluoromethylbenzaldehyde and a substituted acetophenone, 3-(4-nitrophenoxy)acetophenone
(m,p-NPAP), followed by a reduction of the resulting dinitro compound 4-(4-trifluoromethylphenyl)-2,6bis[3-(4-nitrophenoxy)phenyl] pyridine (m,p-3FPNPP) with Pd/C and hydrazine monohydrate. The aromatic diamine was employed to synthesize a series of pyridine-containing
polyimides by polycondensation with various aromatic dianhydrides in N,N-dimethylformamide (DMF) via the conventional two-step method, and further thermal or chemical imidization forming polyimides. The inherent viscosities of the resulting poly(amic acid)s and polyimides
were 0.62–0.89 and 0.58–0.69 dl/g, and most of the polyimides obtained by chemical imidization were readily soluble in common organic solvents such as DMF, N,N-dimethylacetamide (DMAc), N-methyl-2-pyrrolidone (NMP) and tetrahydrofuran (THF). Meanwhile, strong
and flexible polyimide films were obtained, which had good thermal stability, with a glass transition temperature (T
g) of 234.4–246.6°C and the temperature at 10% weight loss of 561.4–600.6°C in nitrogen atmosphere, and good optical transparency with the
cut-off wavelengths of 369–378 nm, as well as outstanding mechanical properties with tensile strengths of 89.5–96.4 MPa, a tensile modulus of 1.52–1.63 GPa and elongation-at-break of 7.2–8.7%. The polyimide films also were found to possess low water uptake (0.61–0.79%).
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高影响因子
Energy & Environmental Materials
·
2021
·Vol. 6
·期 2
·e12336
·
IF 15.122
Yaqing Wei,Jun He,Jie Zhang,Mingyang Ou,Yanpeng Guo,Jiajun Chen,Cheng Zeng,Jia Xu,Jiantao Han,Tianyou Zhai,Huiqiao Li
Among the alloying-type anodes, elemental Sb possesses the suitable yet safe plateau, simple lithiation pathway, small voltage polarization, high conductivity, and superior cycle stability. However, challenge is that its intrinsic capacity is rather low (660 mAh g −1 ), <1/6 of silicon. Herein, we propose a seamless integration strategy by merging the voltage and capacity of phosphorus and antimony into a solid solution alloy. Interestingly, the enlistment of P is found greatly enlarge the capacity from 660 to 993 mAh g −1 for such Sb 30 P 30 solid solution, while maintaining a single and stable discharge plateau (~0.79 V) similar to elemental Sb. Various experimental characterizations including XPS, PDF, Raman, and EDS mapping reveal that in such a material the P and Sb atoms have interacted with each other to form a homogenous solid solution alloy, rather than a simple mixing of the two substances. Thus, the Sb 30 P 30 exhibits superior rate performances (807 mAh g −1 at 5000 mA g −1 ) and cyclability (821 mAh g −1 remained after 300 cycles). Furthermore, such Sb 60-x P x alloys can even deliver 621 mAh g −1 at −30°C, which can be served as the alternative anode materials for high-energy and low-temperature batteries. This unique seamless integration strategy based on solid solution chemistry can be easily leveraged to manipulate the capacity of other electrode materials at similar voltage.
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高影响因子
POLYMER
·
2011
·
IF 3.829
Lu Xu,Junjun Li,Daoliang Wang,Youju Huang,Mingming Chen,Liangbin Li,Guoqiang Pan
A series of rod-coil-rod triblock copolymers containing polycaprolactam (PA6) as the coil block and poly ( p -benzamide) (PBA) as the rod block were synthesized by a two-step polycondensation reaction. Proton nuclear magnetic resonance ( 1 H NMR), UV–vis spectrophotometry (UVS) and differential scanning calorimetry (DSC) were performed to determine the fundamental molecular structure and thermal property of copolymers . UV–vis spectrophotometry results revealed that the content of PBA homopolymer increased with the block length (number of monomer) of PBA and reached a plateau value ranging from 22 to 40 monomers of PBA. The wide angle X-ray diffraction (WAXD) measurements indicated that the crystallization of PA6 blocks was strongly suppressed due to the stretching from rods after annealed at temperature above the melting point of PA6. Only a few imperfect crystals of PA6 existed in the samples with low volume fraction of PBA. Moreover, the variation of PA6 block length hardly affected the crystallinity of PBA, which was dominantly controlled by the block length of PBA as diffusion was the control step for PBA crystallization at the annealing temperature.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2019
·
IF 3.571
Yajing Fang,Mengmeng Xia,Fuqiang Liang,Weiwei Cao,Siyi Pan,Xiaoyun Xu
This study was aimed to determine the mechanism for flavonoid poor absorption related to P-glycoprotein (P-gp). The cellular uptake (CU) of 40 flavonoids was investigated in P-gp overexpressing KB/multidrug-resistant (MDR) cells. A total of 9 flavonoids, including 5,7,3′,4′-tetramethoxyflavone, with a significant (p < 0.05) CUKBE (2.90 ± 0.146 μmol/g) higher than CUKBP (1.57 ± 0.129 μmol/g) were identified as P-gp substrates. Besides, 8 substrates, including tangeretin, showed a significant (p < 0.05) CUKB (9.72 ± 1.09 μmol/g) higher than its CUKBP (7.36 ± 0.692 μmol/g). A total of 7 of 17 flavonoid substrates stimulated the P-gp efflux of rhodamine 123, and most substrates increased P-gp expression in KB/MDR cells. Docking analyses showed a good correlation (R = 0.764; p < 0.01) between efflux fold and S_scoring of flavonoids to the P-gp model, indicating consistency between in silico and in vitro results. A structure–affinity relationship exhibited that 3-OH, 5-OH, 3′-OCH3, and 4′-OCH3 are crucial for flavonoids binding to P-gp. These results provide valuable information for finding a solution to improve the absorption of flavonoids.
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高影响因子
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