TALANTA
·
2016
·
IF 4.035
Junwei Liu,Yong Wang,Weixia Li,Peimin Zhang,Nani Wang,Shuchao Wu,Yan Zhu
Poly (glycidylmethacrylate-divinylbenzene) (Poly (GMA-DVB)) microspheres were prepared by the two-staged swelling and polymerization method, and modified with octadecylamine (ODA) to obtain ODA-poly (GMA-DVB) stationary phase for HPLC. The new material was characterized by scanning electron microscope, nitrogen adsorption-desorption measurement, Fourier transform infrared spectrum , elemental analysis and thermogravimetric analysis . The results showed that poly (GMA-DVB) microspheres had good monodispersity, porosity and ball shapes. The diameters and specific surface area of the microspheres were about 6 µm and 396 m 2 g −1 , respectively. ODA-poly (GMA-DVB) stationary phase had good thermal stability. Furthermore, the chromatographic performance of the stationary phase was illustrated by separating n-alkylbenzenes, mono-substituted benzenes and N -nitrosamines. Auxiliary quantum chemistry calculation was also carried out to evaluate the interaction mechanism. According to the evaluation, ODA-poly (GMA-DVB) stationary phase exhibited good hydrophobicity and hydrophobic selectivity, strong stereo-selectivity, polar interaction and π-π interaction. The multi-interaction mechanisms could very likely guarantee its excellent chromatographic performance for the analysis of complex samples. Finally, the column was successfully applied in the determination of N -nitrosamines in pickles sample.
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CHEMICAL ENGINEERING JOURNAL
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2017
·
IF 6.216
Xiong Song,Suqing Wang,Guoping Chen,Tuo Gao,Yue Bao,Liang-Xin Ding,Haihui Wang
A novel lightweight, multi-functional layer comprised of 1D porous Fe-embedded nitrogen-doped carbon nanofibers (Fe-N-C) and 2D graphene sheets is introduced to modify a commercial polypropylene (PP) separator for use in lithium-sulfur batteries. Benefiting from the high electrical conductivity and strong lithium polysulfide (LiPS) chemical adsorption ability of Fe-N-C, the porous intercalation-structured modified layer exhibits excellent ability to suppress LiPS shuttling while maintaining high lithium-ion transport, and the modified layer functions as a highly conductive upper current collector to reutilize active sulfur species. The cell assembled with the modified multifunctional separator shows a high rate capability and excellent cycling stability, exhibiting a capacity of 847.9 mAh g −1 at 2 C and a low degradation rate of 0.053% per cycle over 500 cycles at 0.5 C.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Yuqian Li,Liguo Wang,Peng He,Kelin Huang,Huiquan Li,Yan Cao
In this study, the quasi-static ebulliometric method was used to measure both of the vapor pressures of methyl N -phenyl carbamate (MPC), and the isobaric vapor–liquid equilibrium (VLE) data of the aniline and MPC binary system. The measured vapor pressure data of MPC, at different temperature ranging from 369.60 to 389.54 K, fitted well with the Antoine equation. The VLE data for the aniline and MPC system at (2.00, 4.00, 6.00, 7.00 and 8.00) kPa were correlated by both of nonrandom two-liquid (NRTL) and Wilson models. The parameters of the two models were obtained by regressing the experimental data, with the absolute temperature deviations of 0.54 K and 0.53 K, respectively. The relative volatility of the binary system calculated was all far more than 1, which gives the conclusion that the high purity MPC can be separated from aniline and MPC binary system by rectification or distillation technology.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Jianguo Chang,Xiuyun Yang,Yuqin Ma,Jing Shao,Xiaoniu Yang,Zhaobin Chen
On the basis of the reaction of 5,5-dimethylhydantoin potassium salt with dibrominated alkane, a series of hydantoin derivatives in which two hydantoin rings are bridged by an alkyl chain with different length (C2, C6, C8, and C12) were synthesized. Upon chlorination, these compounds were transformed into hydantoin-based N-halamines. The structures of these samples were fully characterized with 1H NMR, FT-IR, UV/vis, thermal analyses, and iodometric titration. The antibacterial activity of these N-halamines was assessed with 4 × 109 CFU/mL of Gram-negative Escherichia coli under different chlorine concentrations and over different periods of contact time. It was found that the antibacterial properties and the releasing characteristics of the active chlorine of the hydantoin-based N-halamines changed obviously with increased alkyl chain length, and the factors influencing the antibacterial efficacy were discussed in terms of water solubility, steric effect, electron-donating effect, and action mechanism.
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JOURNAL OF CATALYSIS
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2017
·
IF 6.844
Yan Cao,Zipeng Xing,Mengqiao Hu,Zhenzi Li,Xiaoyan Wu,Tianyu Zhao,Ziyuan Xiu,Shilin Yang,Wei Zhou
Mesoporous black N-TiO 2−x hollow spheres are successfully fabricated through a facile evaporation-induced self-assembly (EISA) process, coupled with an etching procedure and an in-situ solid-state chemical reduction strategy. The resultant black N-TiO 2−x hollow spheres with high crystallinity possess a narrow band gap of ∼2.37 eV, a large specific surface area of ∼128 m 2 g −1 , and a well defined hollow sphere structure, which exhibit excellent visible-light-driven photocatalytic performance for degradation of phenol , reduction of Cr(IV), and hydrogen production . The photocatalytic reaction apparent rate constants (k) of the black N-TiO 2−x for phenol degradation and Cr(IV) reduction are ∼5 and 6 times higher than that of pristine TiO 2 , and hydrogen production rate for N-TiO 2−x is ∼160 μmol h −1 , which is ∼7 folds higher than that of pristine one. The excellent photocatalytic and photoreduction property can be attributed to the synergy effect of N and Ti 3+ codoping narrowing the band gap, the high specific surface area offering more surface active sites, and the mesoporous hollow structure favoring light harvesting and refraction.
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ENVIRONMENTAL POLLUTION
·
2016
·
IF 4.839
Qingqi Lin,Siyuan Chen,Yuanqing Chao,Xiongfei Huang,Shizhong Wang,Rongliang Qiu
Uptake and accumulation by plants is a significant pathway in the migration and transformation of phthalate esters (PAEs) in the environment. However, limited information is available on the mechanisms of PAE metabolism in plants. Here, we investigated the metabolism of di- n -butyl phthalate (DnBP), one of the most frequently detected PAEs, in pumpkin ( Cucurbita moschata ) seedlings via a series of hydroponic experiments with an initial concentration of 10 mg L −1 . DnBP hydrolysis occurred primarily in the root, and two of its metabolites, mono- n -butyl phthalate (MnBP) and phthalic acid (PA), were detected in all plant tissues. The MnBP concentration was an order of magnitude higher than that of PA in shoots, which indicated MnBP was more readily transported to the shoot than was PA because of the former's dual hydrophilic and lipophilic characteristics. More than 80% of MnBP and PA were located in the cell water-soluble component except that 96% of MnBP was distributed into the two solid cellular fractions (i.e., cell wall and organelles) at 96 h. A 13–20% and 29–54% increase of carboxylesterase (CXE) activity shown in time-dependent and concentration-dependent experiments, respectively, indicated the involvement of CXEs in plant metabolism of DnBP. The level of CXE activity in root subcellular fractions was in the order: the cell water-soluble component (88–94%) >> cell wall (3–7%) > cell organelles (3–4%), suggesting that the cell water-soluble component is the dominant locus of CXE activity and also the domain of CXE-catalyzed hydrolysis of DnBP. The addition of triphenyl phosphate, a CXE inhibitor, led to 43–56% inhibition of CXE activity and 16–25% increase of DnBP content, which demonstrated the involvement of CXEs in plant metabolism of DnBP. This study contributes to our understanding of enzymitic mechanisms of PAE transformation in plants.
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JOURNAL OF POWER SOURCES
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2016
·
IF 6.333
Yanli Niu,Xiaoqin Huang,Weihua Hu
Oxygen reduction reaction (ORR) electrocatalysts with high activity, low cost and good durability are crucial to promote the large-scale practical application of fuel cells. Particularly, iron carbide (Fe 3 C) supported on nitrogen-doped carbon has recently demonstrated compelling promise for ORR electrocatalysis . In this paper, we report the facile synthesis of mesoporous Fe/N-doped graphene with encapsulated Fe 3 C nanoparticles (Fe 3 C@Fe/N-graphene) and its superior ORR catalytic activity . This hybrid material was synthesized by the spontaneous oxidative polymerization of dopamine on graphene oxide (GO) sheets in the presence of iron ion , followed by thermal annealing in Argon (Ar) atmosphere. As-prepared material shows high ORR catalytic activity with overwhelming four-electron reduction pathway, long-term durability and high methanol tolerance in alkaline media . This work reports a facile method to synthesize promising ORR electrocatalysis with multiple components and hierarchical architecture, and may offer valuable insight into the underlying mechanism of Fe 3 C-boosted ORR activity of Fe/N doped carbon.
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CATALYSIS COMMUNICATIONS
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2017
·
IF 3.33
Tingting Hou,Chaofeng Zhang,Yehong Wang,Zhenting Liu,Zhixin Zhang,Feng Wang
A metal-free and efficient approach to N -arylpyrrolidines from arylamines and cyclic ethers catalyzed by hydrogen iodine is described. In this protocol, no additive is added and a wide range of N -arylpyrrolidines are synthesized with up to 99% yield. Reaction mechanism involving iodine radical is proposed.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Tongkun Zhao,Jiakui Zhang,Zheng Du,Yahua Liu,Guoli Zhou,Jingtao Wang
Two-dimensional transition metal carbides, MXenes, with large surface area, excellent electrical conductivity and chemical stability, have proved promising for energy storage. However, the irreversible re-stacking and low capacity of MXenes restrict their development and practical applications. Here, the N-doped carbon decorated MXene (Ti 3 C 2 T x @NC) composites were synthesized via an in-situ self-polymerization of dopamine on the surface of Ti 3 C 2 T x followed by a carbonization process. The Ti 3 C 2 T x and Ti 3 C 2 T x @NC were systematically characterized, which have been manifested that NC were equably decorated on the surface and interlayer of Ti 3 C 2 T x sheets and a unique three-dimensional composited nanostructure was fabricated. Such nanostructure can confer both high surface area of NC layer and effective avoidance of the restacking of Ti 3 C 2 T x sheets, whilst, importantly, rendering the composites good conductivity and additional pseudocapacitance. As a result, the optimized Ti 3 C 2 T x @NC-2 composite exhibited a high specific capacitance of 442.2 F g −1 under a current density of 1 A g −1 , which is 281% higher than that of Ti 3 C 2 T x . As a further description, Ti 3 C 2 T x @NC achieved an excellent cycling stability with capacitance retaining 91.9% after 5000 cycles and a high rate capability of 92.5% at 10 A g −1 . Besides, the Ti 3 C 2 T x @NC-2-based symmetric supercapacitor presents a delighted energy density and power density. Therefore, the elaborately designed Ti 3 C 2 T x @NC composites provided a pregnant exploration for energy-related applications.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 4
·3796-3805
·
IF 1.798
Hou Huilin,Gao Fengmei,Shang Minghui,Wang Lin,Zheng Jinju,liu Qiao,Yang Zuobao,Xu Jiahuan,Yang Weiyou
Improving the photocatalytic efficiency of TiO 2 semiconductor is crucially important and highly desired for its practical applications. In the present work, aiming to broaden the photoresponse window and limit the photocatalyst aggregation, we reported the exploration of N-doped TiO 2 thoroughly mesoporous nanofibers with high purity in morphology via a foaming-assisted electrospinning strategy. The foaming agents and urea were introduced in the raw materials to create the mesopores and incorporate the N dopants into the conventional solid TiO 2 nanofibers, respectively, which could be accomplished simultaneously over one-step calcination process. The synergetic combination of N dopants and one-dimensional mesoporous nanostructure allow the TiO 2 fibers to exhibit significantly enhanced visible-light photocatalytic activity toward the Rhodamine B and hydrogen evolution, as compared to those of N-doped solid and intrinsic thoroughly mesoporous counterparts, suggesting their promising applications in water purification and energy supply.
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MOLECULAR DIVERSITY
·
2024
·
IF 3.9
Zhang Yuhao,Zhou Bohang,Wei Pengan,Liu Le,Bai Ruofei,Wang Yiwei,Zhou Le
Succinate dehydrogenase inhibitors (SDHIs) as one of the fastest-growing fungicide categories for plant protection. In this study, a series of N ′-phenyl pyridylcarbohydrazides as analogues of commercial SDHIs were designed and evaluated for inhibition activity on phytopathogenic fungi to search for potential novel SDHIs. The determination of antifungal activity in vitro and in vivo led to the discovery of a series of compounds with high activity and broad-spectrum property. Especially, N ′-(4-fluorophenyl)picolinohydrazide ( 1c ) and N ′-(3,4-fluorophenyl)picolinohydrazide ( 1ae ) showed 0.041–1.851 μg/mL of EC 50 values on twelve fungi, superior to positive controls carbendazim and boscalid. In vivo activity, 1c at 50 μg/mL showed 61% of control efficacy at the post-treatment 9th day for the infection of P. piricola on apples, slightly smaller than 70% of carbendazim. In terms of action mechanism, 1c showed strong inhibition activity with IC 50 of 0.107 μg/mL on SDH in Alternaria brassicae , superior to positive SDHI boscalid (IC 50 0.182 μg/mL). Molecular docking indicated that 1c can well bind with the ubiquinone-binding region of SDH mainly by hydrogen bond, carbon hydrogen bond, π-alkyl, amide- π stacking, F–N and F–H interactions. Furthermore, scanning and transmission electron micrographs showed that 1c was able to obviously change the structure of mycelia and cell membrane. Fluorescence staining analysis showed that 1c could increase both the intracellular reactive oxygen species level and mitochondrial membrane potential. Finally, seed germination test, seedling growth test and cytotoxicity assay showed that 1c had very low toxicity to plant growth and mammalian cells. Thus, N ′-phenyl pyridylcarbohydrazides especially 1c and 1ae can be considered promising fungicide alternatives for plant protection. Graphical abstract
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JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Li Jiaxin,Guo Hui,Ji Weiwei,Chen Hanqi,Zhao Fengju,Yang Wei,Guo Lili,Qian Junqing
Tyrosinase inhibitors have the ability to resist melanin formation and can be used for clinical and cosmetic, so it is becoming extremely crucial to search a rapid and effective method for detecting t the activity of tyrosinase. In this study, a sensing probe based on Nitrogen-doped graphene quantum dots (N-GQDs) were prepared with carbamide and citric acid. Tyrosinase can oxidize dopamine to dopamine quinone, which can quench the fluorescence of N-GQDs based on the principle of fluorescence resonance energy transfer (FRET) process, and then the detection of tyrosinase activity can be achieved. The result demonstrated that the fluorescence intensity of N-GQDs was a linear correlation with the activity of tyrosinase. Wide detection linear ranges between 0.05 and 5 U/mL and high selectivity. The detection range of tyrosinase was 0.05 to 5 U/mL and LOD of 0.005 U/mL. According to the above, the fluorescence method established in this work could be successfully used for the trace analysis of tyrosinase and it was verified that KA is an inhibitor of tyrosinase.
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