JOURNAL OF COORDINATION CHEMISTRY
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2020
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IF 1.41
Huang-Fei Qin,You Li,Xing-Mei Qin,Hai-Ye Li,He-Dong Bian,Qing Yu,Fu-Ping Huang
A new complex formulated as [Mn(H2O)6][Mn2(ett)6]·0.5H2O (1) has been synthesized from 5-(ethylthio)-1H-tetrazole) (Hett) andMn(OAc)2·4H2O. The crystal structure is composed of one [Mn(H2O)6] 2+ cation and an [Mn2(ett)6] 2– anionic chain. Two Mn(II) ions are bridged by μ2-ett – ligands to give [Mn2(ett)6] 2– anionic chains, which is balanced by cationic part of [Mn(H2O)6] 2+ in charge. The hydrogen bonds between anionic/cationic units play an important role in the formation of three-dimensional (3-D) supramolecular structure of 1. Magnetic measurements of 1 exhibit an interesting spin canting behavior and long-range magnetic ordering.
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JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
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2021
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IF 3.517
Xia Zhao,Sihao Liu,Yuemei Han,Yuqin Wang,Quankui Lin
The main reason for the failure of glaucoma drainage devices is the chronic inflammatory reaction caused by the poor biocompatibility of biomaterials, which leads to the migration and proliferation of scleral fibroblasts surrounding the devices thus forming the encapsulation that will block the aqueous humor drainage channel. In order to inhibit the reaction of scleral fibroblasts after glaucoma drainage device implantation, this study designed and fabricated a 5-fluorouracil (5-FU) loaded chitosan microtube (CMT) for glaucoma aqueous humor drainage. The CMTs were made by template based adsorption-precipitation method using chitosan with excellent biocompatibility as raw material due to its characteristic of pH dependent solubility. The physical properties of CMTs were investigated. The in vitro and in vivo biocompatibilities were studied as well. The developed drainage device is expected to possess the dual function of reducing intraocular pressure and inhibiting excessive fibrosis after glaucoma drainage device implantation, thereby providing a novel way for the research of glaucoma drainage devices.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Fuxiang Feng,Xiaopo Niu,Li Wang,Xiangwen Zhang,Qingfa Wang
Ni/ZSM-5 nanosheet catalysts with different Si/Al ratios were modified by chemical liquid deposition (CLD) of tetraethoxysilane (TEOS) to tailor their acid spatial distribution. Their catalytic performance was evaluated with the hydroconversion of oleic acid to aviation-fuel-range-alkanes (AFRAs) at different reaction temperatures and H 2 pressures. The modified catalysts inherit the nanosheet structure with decreased external Brønsted acid concentration, especially the strong one. External Brønsted acid sites mainly favor the cracking of the deoxygenated products (C 17 /C 18 ). Internal Brønsted acid sites mainly enhance the isomerization of the linear AFRAs. And the catalytic activity of the external Brønsted acid sites was more sensitive to reaction temperature than that of the internal ones. The deoxygenation and cracking reactions were also more sensitive to H 2 pressure compared to the isomerization reaction. High AFRA selectivity of 51.4% as well as high iso/n -alkanes ratio of 1.7 were achieved at 250 °C and 10 bar over NS200(1).
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RSC Advances
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2020
·Vol. 10
·期 2
·784-789
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IF 3.119
Hongshe Wang,Yichun Wang,Yinfeng Han,Weixing Zhao,Xiaomei Wang
Humic acid is a non toxic, inexpensive, easily available high-molecular weight polymer. A simple and facile one pot three-component synthesis of 5-substituted 1H-tetrazoles from aldehydes, hydroxyamine hydrochloride and sodium azide using humic acid as an efficient catalyst in water is described. The method reported has several advantages such as high to excellent yields, easy work-up, mild reaction conditions, use of water as a green solvent, and a commercially available, nontoxic and reusable catalyst.
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COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
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2020
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IF 2.897
Jiao Yang,Qingyi Huang,Huan Liu,Xiong Zhou,Zhuoquan Huang,Quansheng Peng,Chunhong Liu
Environmental endocrine disruptors 4-nonylphenol (NP) and 4-tert-octylphenol (OP) may cast huge harm to human health. We used a rat model to observe the influence of NP or/and OP exposure on anxiety-related behaviors and the underlying mechanisms. Eighty male Sprague-Dawley (SD) rats were randomly divided into 10 groups: control group (corn oil), NP groups [30, 90, 270 mg/kg], OP groups [40, 120, 360 mg/kg] and NO groups [(mixed with the corresponding NP, OP alone exposed low, medium and high dose according to the natural environment exists NP:OP = 4:1]. The rats were orally administered every other day for 30 days. The neurobehaviors of rats were evaluated by open-field test (OFT) and elevated plus-maze test (EPM), and the concentrations of 5-HT, monoamine oxidase (MAOA), serotonin transporter (SERT), vesicular monoamine transporter 2 (VAMT2), 5-hydroxytryptamine 1A (5-HT 1A ), 5-hydroxytryptamine 2A (5-HT 2A )，and 5-hydroxytryptamine 2C (5-HT 2C ) in the rat prefrontal cortex were analyzed by ELISA . OFT and EPM tests showed that NP or/and OP exposure induced anxiety-related behaviors in rats. 5-HT levels were significantly increased compared with the control group. The levels of MAOA, SERT, VAMT2, 5-HT 1A , 5-HT 2A, and 5-HT 2C in the prefrontal cortex reduced in different degrees by high-doses NP or/and OP exposure. In summary, NP or/and OP exposure might cause anxiety-related behaviors in rats through regulating neurotransmitter 5-HT levels by altering the expression of 5-HT decomposition enzyme MAOA, transporters SERT and VMAT2, and 5-HT receptors 5-HT 1A , 5-HT 2A, and 5-HT 2C .
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FUEL
·
2019
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IF 5.128
Chengchao Liu,Yao Chen,Yanxi Zhao,Shuai Lyu,Liang Wei,Xin Li,Yuhua Zhang,Jinlin Li
ZSM-5 zeolite is usually used to modify the product selectivity for Fischer–Tropsch synthesis (FTS). Here, we prepared a nano-ZSM-5 zeolite with a particle size of 80 nm. This zeolite was used as a support to prepare bifunctional Co-based FTS catalysts by incipient wetness impregnation [using water as a solvent (W-Co/H-ZSM-5) or alcohol as a solvent (A-Co/H-ZSM-5)] and an ultrasound-assisted impregnation method (U-Co/H-ZSM-5). These catalysts were characterized by X-ray diffraction (XRD), N 2 -physical absorption, H 2 temperature-programmed reduction (H 2 -TPR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The FTS catalytic performances of all catalysts were compared in a fixed-bed reactor. Characterization data revealed that the U-Co/H-ZSM-5 catalyst had the best cobalt dispersion, resulting in the most stable CO conversion. Moreover, the nanoscale relationship between the activity and acid sites enhances the hydrocracking ability, increasing the liquid fuel selectivity from 49.7% to 67.8% (no C 20+ product was detected for U-Co/H-ZSM-5) for a reaction at 503 K. In addition, the CH 4 selectivity increases as the reaction temperature increases from 483 K to 513 K, which is beneficial for producing liquid fuel products (67.8%) at a reaction temperature of 503 K.
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APPLIED THERMAL ENGINEERING
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2019
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IF 4.026
Cheng-Yang Cao,Dan Zhang,Chang-Cheng Liu,Song Lu,He-Ping Zhang
5-AT/Sr(NO 3 ) 2 based composite propellants have been applied in fire extinguishing fields as novel power source for several years due to its high thermal stability and large gas production, but the disadvantage of poor combustion stability still indeed to improve. In this study, the influential mechanism of two common burning modifier, nanosized Copper oxide (nano-CuO) and nanosized Zinc oxide (nano-ZnO), on the thermal behavior and combustion characteristics under high pressure of 5-AT based composite propellant was deeply investigated. Simultaneous thermogravimetric-differential thermal analysis (TG-DTA) have been used to identify the changes in the thermal and kinetic behavior of the catalyzed composite propellant. Thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TG-FTIR) analysis and pyrolysis-gas chromatography with mass spectrometry (Py-GC/MS) analysis were employed to characterize the composition of evolved gas in propellant decomposition process. Combined with results of the combustion characteristics measurement conducted on a strand burner (1–5 MPa), different kinds of influential mechanisms of these two catalysts on decomposition process and combustion process under elevated pressure conditions were proposed based on presumed physical combustion model. Outcomes of this study will contribute to the design of 5-aminotetrazole solid propellant with a superior combustion property under high pressure, and promote its application into fire-fighting area.
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Journal of Oleo Science
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2019
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IF 1.208
Zhe Tang,Jianhui Su
A simple solid base catalyst, ammonium aluminum carbonate hydroxide (AACH), was prepared and its structure was characterized by many technologies, including XRD, FT-IR, SEM, BET and Elemental Analysis. The prepared catalyst was used to catalyze the conversion of glucose into 5-hydroxymethylfurfural (HMF) in ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]+Cl–) and dimethyl sulfoxide (DMSO) mixtures. Various reaction conditions, including catalyst loading, reaction temperature, reaction duration and solvent, were investigated. A moderated HMF yield of 52.17 % was obtained at the mild reaction conditions (120°C for 4 h). More importantly, the catalyst could be reused for several times without the loss of its significant catalytic activities. After five reaction runs, a HMF yield about 49.34 % was also obtained.
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APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Shaoxia Wang,Jing Li,Yang Qiu,Xuming Zhuang,Xuran Wu,Jing Jiang
Copper is one of the essential trace elements in human body which plays a vital role in the processes of fundamental physiology. Therefore, analysis and detection of copper ions has attracted tremendous attention. In this paper, an electrochemical sensor was successfully developed based on 5-sulfosalicylic acid modified nanocomposite of molybdenum disulfide nanosheets and oxidized multi-walled carbon nanotubes (SSA/MoS 2 /o-MWCNTs). The nanocomposite was characterized by scanning electron microscopy, transmission electron microscopy , element mapping, X-ray diffraction, Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, Raman spectroscopy , and electrochemical measurements. Then, nanocomposite-modified glassy carbon electrode was used for the detection of Cu 2+ . Electrochemical analysis of Cu 2+ was performed by differential pulse voltammetry , and the effects of pH, deposition potential, and deposition time were investigated. The results showed that the peak current increased linearly with increasing Cu 2+ concentration over the range of 0.1–11 μM and a detection limit of 0.057 μM (S/N = 3). Finally, the developed sensor was applied for the analysis of Cu 2+ in lake water and dairy products, and the results were consistent with the results of ICP-MS analysis. Therefore, this work demonstrates that the proposed electrochemical sensor can be easily used for the daily monitoring of Cu 2+ .
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JOURNAL OF ETHNOPHARMACOLOGY
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2019
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IF 3.414
Bojun Chen,Jijun Li,Yuhuan Xie,Xi Ming,Gang Li,Jinjin Wang,Meng Li,Xiaohong Li,Lei Xiong
Ethnopharmacological relevance Cang-ai volatile oil (CAVO) is a traditional Chinese medicine (TCM) inhalational preparation for the treatment of some depressive and emotive disorders. Aim of the study This research aimed to evaluate the efficiency and possible mechanism of intranasal CAVO administration on depression in chronic unpredictable mild stress (CUMS)-induced rats compared to lavender volatile oil (LVO) treatment after CUMS exposure and bilateral olfactory bulb impairment (OBI) in rats. Materials and methods Forty depressive-like model rats induced by CUMS were evaluated by the forced swim test (FST), open field test (OFT), and sucrose preference test (SPT). The model rats were divided into five groups: CUMS (n = 8), CAVOh + CUMS (n = 8), CAVOl + CUMS (n = 8), LVO + CUMS (n = 8), and OBI + CAVO + CUMS (n = 8). The CUMS-induced rats were treated for a period of 4 weeks. The other healthy rats were regarded as the control (CTR, n = 8) subjects. The levels of serotonin (5-HT) and dopamine (DA) and their respective metabolites homovanillic acid (HVA) and 5-hydroxyindol acetic acid (5-HIAA) were measured in brain tissue homogenates of CUMS-induced rats using enzyme-linked immunosorbent assay (ELISA). Results CAVO ameliorated depressive-like behaviors (p < 0.05 ). The levels of DA in the CUMS group were lower than those in the CTR and CAVOh groups (** p < 0.01 and * p < 0.05 ). The levels of HVA were lower in the CUMS group than in the CTR, LVO, OBI + CAVOh and CAVOh groups (** p < 0.01 and * p < 0.05 ) and lower in the OBI + CAVOh group than in the CAVOh group (** p < 0.01 ). The levels of 5-HT in the CUMS group were lower than those in the CTR and CAVOh groups (** p < 0.01 ). The levels of 5-HIAA were lower in the CUMS and OBI + CAVOh groups than in the CTR, LVO and CAVOh groups (** p < 0.01 ). Conclusions CAVO can improve depressive-like behaviors concomitant with the regulation of DA and 5-HT metabolism in the brains of CUMS-induced rats.
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Molecular Catalysis
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2019
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IF 2.938
Baole Sang,Jiang Li,Xiqiang Tian,Fulong Yuan,Yujun Zhu
The design of a stable and efficient catalyst is crucial to the creation of high-valued bio-based products, and the catalytic selective oxidation of 5-hydroxymethylfurfural (5-HMF) to 2, 5-furandicarboxylic acid (FDCA) has received increasing attention. Different loadings of Au supported on the graphitized carbon (GC) catalysts ( x wt%Au/GC ( x = 0.7, 1.0, 1.3, 2.0 and 2.7)) were prepared and characterized via ICP-OES, N 2 adsorption-desorption, XRD, FT-IR, TG, XPS and TEM. Results show that 2.0 wt%Au/GC displays 97% selectivity of FDCA and a near 100% conversion of 5-HMF in water under 7 bar O 2 pressure for 6 h at 110 °C in the presence of NaOH, which also exhibits good cycling stability. The surface species of Au 0 are in favor of the formation of FDCA. In this work, different reaction parameters were explored to optimize the reaction condition. The intermediates and the reaction pathways were also proposed on the basis of the formation and degradation of esters via various characterizations.
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Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·437-446
·
IF 5.934
Yuwei Wang,Xianggui Kong,Meihong Jiang,Fazhi Zhang,Xiaodong Lei
A bifunctional ZnIn2S4/Nb2O5 (ZIS/NbO) photocatalyst was constructed by growing Nb2O5 nanospheres on the petals of ZnIn2S4 microspheres via a facile hydrothermal approach. The composite possessed a direct Z-scheme heterostructure that was confirmed by in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) and electron spin resonance (ESR) measurements. Owing to the good charge separation efficiency in the Z-scheme system, the lifetime of charge carriers in ZIS/NbO was obviously prolonged. Thus, the rate of hydrogen evolution for optimized ZIS/NbO was 2.8 and 1.8 times higher than that of Nb2O5 and ZnIn2S4, respectively. Furthermore, the ZIS/NbO also showed good performance for the oxidation of biomass-derived intermediate 5-hydroxymethylfurfural (HMF) to value-added products. More importantly, the coupled photocatalytic H2 reduction and HMF oxidation were achieved on the ZIS/NbO Z-scheme heterostructure at the same time. Due to the presence of a direct Z-scheme heterojunction that prevents the recombination of photogenerated electrons and holes in the composite, the ZIS/NbO displayed excellent photocatalytic performance. Our findings are expected to offer a broad optical window for fabricating bifunctional heterostructured composites for coupled photocatalytic reduction and oxidation.
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