SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Jun-Dan An,Tian-Tian Wang,Yang-Fan Shi,Jian-Zhong Huo,Xiang-Xia Wu,Yuan-Yuan Liu,Bin Ding
In recent years, a new type of micro-porous material, namely metal organic framework material, has received more and more attention from many basic and industrial fields because these materials possess unique advantages. In this work, through the powerful sonochemical preparation method, a three-dimensional cluster-based Cd II -MOFs, {[Cd(abtz) 2 (H 2 O) 2 ]·(ClO 4 ) 2 ·H 2 O} n ( 1 , abtz = 1-(4-aminobenzyl)-1H-1,2,4-triazole) can be quickly synthesized in the facile ultrasonic method. Powder X-ray diffraction (PXRD) measurement confirms that these bulky samples 1 (synthesized on different ultrasonic powers and ultrasonic time conditions) were pure . In addition, ultrasonic chemical time and irradiation power did not change the structure of composites materials 1 . SEM and morphological changes of 1 in the ultrasonic synthesis are also determined. Moreover, 1 exhibits good stability, the structure of 1 can be maintained not just in various solvents, and in aqueous environments with pH values from 2 to 12. Photo-luminescent experiment also reveals that complex 1 has the excellent application prospect as highly sensitive sensing material for the biomarker DPA (2,6-pyridine dicarboxylic acid) and 5-HT (5-hydroxytryptamine) through the photo-luminescence “turn-on” and “turn-off” effect, respectively. Further photo-luminescent measurements also show that different ultrasonic powers and ultrasonic time can effectively induce fluorescent sensing enhancement for biomarkers DPA and 5-HT based on the water stable clustered-based cadmium(II) coordination framework.
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高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Yong Huang,Shasha Liu,Jie Zhang,Syed Shatir A. Syed-Hassan,Xun Hu,Hongqi Sun,Xun Zhu,Jianbin Zhou,Shu Zhang,Hong Zhang
This study investigated the interactions between volatile and char during biomass pyrolysis at 400 °C, employing a β–5 lignin dimer and amino-modified graphitized carbon nanotube (CNT–NH 2 ) as their models, respectively. The results demonstrated that both –NH 2 and its carrier (CNT) facilitated the conversion of the β–5 dimer, which significantly increased from 9.7% (blank run), to 61.6% (with CNT), and to 96.6% (with CNT–NH 2 ). CNT mainly favored the breakage of C–O bond in the feedstock to produce dimers with a yield of 55.5%, while CNT–NH 2 promoted the cleavage of both C–O and C–C bonds to yield monomers with a yield up to 63.4%. Such significant changes in the pyrolysis behaviors of the β–5 lignin dimer after the introduction of CNT–NH 2 were considered to be mainly caused by hydrogen-bond formations between –NH 2 and the dimeric feedstock/products, in addition to the π–π stacking between CNT and aromatic rings.
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高影响因子
CHROMATOGRAPHIA
·
2020
·Vol. 83
·期 4
·541-548
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IF 1.596
Yu Kaili,Yue Mei-E,Xu Jie,Jiang Ting-Fu
A capillary electrophoresis (CE) method was developed for the screening of 5′-methylthioadenosine nucleosidase (MTAN) inhibitors in traditional Chinese drugs and small molecular compounds. In this method, reaction occurred at the capillary inlet during a predetermined waiting period, followed by electrophoretic separation of the reaction substrates and products. Parameters affecting separation efficiency and enzyme activity were evaluated systematically. The optimized conditions were as follows: 30 mM phosphate (pH 3.0) running buffer, 25 kV applied voltage, 20 mM HEPES (pH 6.0) reaction buffer, and 4 min incubation time. Under the optimized conditions, the Michaelis–Menten constant ( K m ) of MTAN was 3.44 μM, which agreed with the documented data. The proposed method was successfully applied for MTAN inhibitor screening from 21 natural extracts and 8 small molecular compounds. The results demonstrated the practical applicability of the at-inlet reaction-based CE method in screening of MTAN inhibitors from natural products and small molecular compounds.
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高影响因子
NEUROSCIENCE LETTERS
·
2020
·
IF 2.274
Ji-Duo Shen,Yue-Wen Zhang,Bao-Ying Wang,Li Bai,Shuai-Fei Lu,Lei-Lei Zhu,Ming Bai,Yu-Cheng Li,Er-Ping Xu
Growing evidence suggested that energy deficiency might be involved in the pathophysiological mechanism of depression. Energy deficiency, mainly results from mitochondrial damage, can lead to the dysfunction of synaptic neurotransmission, and further cause depressive-like behavior. The antidepressant effect of resveratrol had been widely demonstrated in previous studies; however, the underlying mechanism remains poorly understood. The present study aimed to investigate whether the antidepressant effects of resveratrol involved in the energy levels and neurotransmission in the hippocampus. We found that resveratrol and fluoxetine significantly attenuated depressive-like behaviors induced by chronic unpredictable mild stress (CUMS), which evidenced by the increased sucrose preference and the reduced immobility time in a forced swimming test. In addition, resveratrol increased hippocampal ATP levels, decreased Na + -K + -ATPase and pyruvate levels, and upregulated the levels of mitochondrial DNA (mtDNA), mRNA expression of sirtuin (SIRT)1 and peroxisome proliferator-activated receptor γ coactivator (PGC)1α. Furthermore, resveratrol and fluoxetine increased serotonin (5-HT) levels and downregulated the mRNA expression of 5-HT transporter (SERT) in the hippocampus. The decreased protein expression of growth-associated protein (GAP)-43 induced by CUMS was also ameliorated by resveratrol and fluoxetine. These findings demonstrated the antidepressant effects of resveratrol and suggested that resveratrol was able to promote mitochondrial biogenesis, enhance ATP and 5-HT levels, as well as upregulate GAP-43 expression in the hippocampus.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Qitong Cheng,Benxian Shen,Jichang Liu,Hui Sun,Di Wu,Lei Jiang,Peikun Yan,Xin Pu,Suhui Ou,Jigang Zhao
An alternative and promising route for the production of light olefins which realizes the objective of effective resource usage is the coupling conversion of n -hexane-methanol. The SAPO-34@ZSM-5 core-shell composite has been designed and fabricated by the steam-assisted crystallization (SAC) method for boosting the n -hexane-methanol synergies. SAC avoids the undesired phase transformation/dissolution of SAPO-34 caused by exposure to harsh basic conditions of the ZSM-5 precursor solution. In comparison with the nanosized ZSM-5 or physical mixture, the SAPO-34@ZSM-5 core-shell zeolite demonstrates a 32–38 wt% increase in the light olefin selectivity, a 28–67 wt% increase in the n -hexane conversion, and an 89–143% improvement in the catalyst lifetime under identical reaction conditions. With the aid of GC-MS analysis of carbonaceous deposits in spent catalysts, higher polymethylbenzenes concentration and lower polycyclic aromatic hydrocarbon (PHA) concentration are obtained from the extracted species of spent SAPO-34@ZSM-5 in comparison with that of other samples, which suggests the aromatic-based route to light olefins is enhanced and the carbonaceous deposition is slowed down. The core-shell configuration of the SAPO-34@ZSM-5 composite diminishes the diffusion rate of methanol towards the SAPO-34 core layer and increases the coupling of n -hexane derivatives with methanol in the hydrocarbon pool (HCP) route. The decreased number of acidic sites on the external surface of the SAPO-34 core layer may also be accounted for the inhibited carbon deposition.
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PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Cheng Man,Yao Wang,Wen Li,Decheng Kong,Jizheng Yao,Hinrich Grothe,Zhongyu Cui,Xin Wang,Chaofang Dong
In this study, the 5-Amino-1,3,4-thiadiazole-2-thiol grafted graphene oxide (AMT-GO) composite was synthesized and the corrosion protection properties of the neat EP, GO/EP and AMT-GO/EP coatings at the ambient and low temperatures were comparatively studied. Based on the experimental results, AMT is anchored on GO mainly via the reactions between -NH 2 and -SH of AMT and -COOH and -CH( O )CH- of GO. After modification, the dispersity of the GO nanosheets is significantly improved. As the filler, both of the GO and AMT-GO nano-platforms could enhance the protective ability of the polymer coating , the latter possessing the more remarkable effect because of its better dispersity and the beneficial impact provided by exposed -NH 2 and -SH. All of the three coatings exhibit worse anti-corrosion performance at the low temperature than the ambient temperature, because the diffusion of corrosive media across the polymer matrix and along the substrate/coating interface could be accelerated by freezing.
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RSC Advances
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2021
·Vol. 11
·期 36
·22365-22375
·
IF 3.361
Guangbing Liang,Yanhong Li,Chun Yang,Xun Hu,Qingyin Li,Wenbo Zhao
In this work, industrial biomass power plant ash was used to synthesize the ZSM-5 zeolites for the first time with the original intention to turn value-added material into wealth, and then committed to adsorption performance testing. Typical chemical structure and morphology of ZSM-5 zeolite were identified by comprehensive technologies. Uniquely, it was found that there was a low pressure hysteresis loop which was caused by crossed 10-membered rings in the N2 adsorption–desorption isotherm. To investigate the adsorption performance for dyes, the zeolite samples were used to remove cationic (MB) and anionic (CR) dyes from aqueous. The results demonstrated that when it came to adsorbing MB, the isotherm was in line with the Redlich–Peterson model (R2 > 0.99), whereas it was matched up with the Sips model (R2 > 0.99) for adsorbing CR. Kinetic models were assigned to the pseudo-second order equation (R2 ≥ 0.99) along with remarkable intraparticle diffusion. In the end, thermodynamic parameters were ΔG0 < 0, and Ea > 0. Especially, adsorbing MB was ΔS0 > 0, and ΔH0 > 0, whilst adsorbing CR was ΔS0 < 0, and ΔH0 < 0, which indicates that electrostatic interaction plays a significant role in the whole process. All in all, this work might encourage novel attempts to dispose of industrial biomass ash.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Shizhu Song,Qi Li,Lifang Zhang,Yanqing Wang,Xiaojuan Liu
Here, N -doped hollow carbon sphere (NHCS)-supported (1 1 1)-plane-engineered sub-5-nm Pt (Pt-NHCS) catalysts regulated precisely by imidazolium ionic liquids were synthesized successfully and used to catalyze oxygen reduction. The (1 1 1)-plane engineered Pt nanocrystals with a diameter of 4.5 ± 0.5 nm were homogeneously deposited on the 3-dimensional spherical nanoshells. The resulting Pt nanocrystals anchored on the carbon skeleton exhibit a stable configuration in both alkaline and acid electrolytes with the help of imidazolium cations and pyrolysis. Among all as-prepared catalysts, the optimized Pt-NHCS shows remarkable long-term durability. Specifically, Pt-NHCS maintains 95.3% of the original current density after 10,000 potential cycles, while Pt/C benchmarks exhibit a retention of 78.5%. Accelerated durability test results indicate that Pt-NHCS exhibits a high efficiency of 96 % in comparison with initial current density, while a value of 86% for Pt/C. Density functional theory calculations demonstrate that reactive Pt(1 1 1) planes with well-defined Schottky defects and vacancies adsorb and activate oxygen molecule rapidly while desorbing the reaction intermediates.
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2019
·
IF 2.29
Yameng Wan,Pengshuai Zhang,Haixia He,Jiao Sha,Rui Zhao,Tao Li,Baozeng Ren
Solubility of cis-5-norbornene-exo-2,3-dicarboxylic anhydride (himic anhydride) in thirteen solvents including methyl acetate (MAC), ethyl acetate (EAC), n -propyl acetate (NPAC), isopropyl acetate (IPAC), n -butyl acetate (NBAC), isobutyl acetate (IBAC), n -amyl acetate (NAAC), methanol (MtOH), ethanol (EtOH), acetone (DMK), N-methyl-2-pyrrolidinone (NMP), N,N-dimethylformamide (DMF) from 278.15 K to 323.15 K and 1,4-dioxane at (288.15–323.15) K was experimentally determined by the gravimetric method under 0.1 MPa. The results showed that the solubility of himic anhydride increased with increasing temperature. The interaction energy between himic anhydride and selected solvents was calculated by molecular simulation to reveal the solubility behavior. Solubility data was correlated by five activity coefficient models including the Two-Suffix Margules model, Wilson model, NRTL model, NRTL-SAC model and uniquac model. Values of ARD (average relative deviations) and RMSD (root-mean-square deviation) between experimental and calculated solubility showed that five activity coefficient models provided good performance in this work. Moreover, thermodynamic properties associated with the solution processes were also discussed.
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CELLULOSE
·
2019
·Vol. 26
·期 5
·3299-3312
·
IF 3.917
Cheng Jincheng,Li Li,Li Yifan,Wang Qiang,He Chiyang
Abstract A new type of pillar[5]arene-polymer-functionalized cotton fibers was prepared with tetrafluoroterephthalonitrile (TFP) grafted first on the fiber surface and then the pillar[5]arene-TFP polymer grafted subsequently. The obtained functionalized fibers (P5A-TFP@cotton) were characterized by scanning electron microscope, X-ray photoelectron spectra, infrared spectra, 13 C CP/MAS nuclear magnetic resonance spectra, and thermo-gravimetric analysis. The P5A-TFP@cotton captured organic pollutants from water with fast kinetics (with equilibrium time of 2 min for MB) and much higher adsorption capacity (4.5 times higher for bisphenol A) than the untreated cotton. The functionalized fibers also adsorbed the environmental-concentration styrene vapor rapidly to a concentration much lower than the limit of the U.S. Occupational Safety and Health Administration within 5 min. The P5A-TFP@cotton showed much higher adsorption ability for various high-concentration volatile organic compounds (VOCs) than the untreated cotton. Moreover, the P5A-TFP@cotton can be easily regenerated and presented good reusability for capturing organic pollutants in water and VOCs in air after simple treatment. The new adsorbent can be utilized in the form of fibers or fabrics for conveniently capturing organic pollutants in water and VOCs in air. These properties make the P5A-TFP@cotton of interest as adsorbent or filter membrane for water purification, air deodorization and detoxification. This methodology can be expanded to the functionalization of other textile fibers or fabrics. Graphical abstract
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高影响因子
THIN SOLID FILMS
·
2019
·
IF 1.888
Jian He,Aisen Li,Yanchun Tao,Ning Chu,Zhixiang Wang,Shuping Xu,Jing Wang,Houyu Zhang,Jingsheng Yu,Weiqing Xu
A two-dimensional (2D) co-crystal composed of 1, 3, 5-trifluoro-2, 4, 6-triiodobenzene and 4, 4′-trimethylenedipyridine via halogen bonding (I···N) was obtained on highly-oriented pyrolytic graphite , and was characterized by scanning tunnelling microscope supplemented by the density functional theory calculation. Its special structure at the interface was further compared with its three-dimensional (3D) co-crystal structure. No orderly structures were observed when Au (111) was applied. The 2D co-crystal grown on the interface is significantly different from the 3D co-crystal. This study is of vital significance in understanding the growth mechanisms of 2D functional co-crystals.
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Nanomaterials
·
2019
·Vol. 9
·期 5
·774
·
IF 4.034
Chihao Lin,Dejian Shi,Zhentao Wu,Lingfeng Zhang,Zhicai Zhai,Yingsen Fang,Ping Sun,Ruirui Han,Jiaqiang Wu,Hui Liu
In this study, a bimetallic oxide catalyst of cobalt-manganese (CoMn2O4) was synthesized using the sol-gel method, and it was then characterized using a variety of techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) spectroscopy, X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption–desorption isotherms. The obtained novel catalyst, i.e., CoMn2O4, was then used as an activator of peroxymonosulfate (PMS) for the catalytic degradation of a commonly-used UV filter, 2-phenylbenzimidazole-5-sulfonic acid (PBSA) in water. The effects of various factors (e.g., catalyst dosage, PMS concentration, reaction temperature, and pH) in the process were also evaluated. Chemical scavengers and electron paramagnetic resonance (EPR) tests showed that the•OH and SO4•−were the main reactive oxygen species. Furthermore, this study showed that CoMn2O4is a promising catalyst for activating PMS to degrade the UV filters.Keywords:CoMn2O4;catalytic degradation;peroxymonosulfate;UV filters;2-phenylbenzimidazole-5-sulfonic acid (PBSA)
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