CATALYSIS COMMUNICATIONS
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2020
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IF 3.612
Mingcai Yin,Jiangfan Sun,Yixian Li,Yimin Ye,Kaiyue Liang,Yaoting Fan,Zhongjun Li
MoS 2 is a promising catalyst for hydrogen evolution reaction, whereas the inherent defects of limited active sites for H 2 evolution and poor conductivity impede its practical application. Herein, low-cost and available activated carbon (denoted as C) was introduced and MoS 2 /C composite was prepared via a facile one-pot liquid-phased reaction. The MoS 2 /C exhibits an excellent photocatalytic hydrogen evolution activity (872.3 μmol/h) sensitized by Erythrosin B under LED light irradiation, which is about 1.8 times that of pure MoS 2 . Moreover, hydrogen evolution mechanism and reasons for the enhanced performance of MoS 2 /C were proposed based on the results of photoluminescence spectra and photoelectrochemical tests.
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高影响因子
PHYTOMEDICINE
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2019
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IF 4.18
Ziru Zhang,Jianbo Ji,Dawei Zhang,Maoqiang Ma,Longru Sun
Background The root of Salvia miltiorrhiza f. alba (RSMA) (Lamiaceae) is used for the treatment of patients with thromboangiitis obliterans (TAO) in traditional Chinese medicine . Previously, a mixture of phenolic acids extracted from RSMA has shown significant protective effects on TAO rats. Purpose This study investigates the inhibitory effects of salvianolic acid B on TAO induced by sodium laurate injection in rats to explore the effective constituents of RSMA in TAO treatment. Methods TAO rats were developed using injected sodium laurate. After treatment with ligustrazine hydrochloride (15 mg/kg) and various doses of salvianolic acid B (10, 20, 40 mg/kg) by tail intravenous injection , levels of thromboxane B 2 (TXB 2 ), 6-keto-prostaglandin F 1α (6-keto-PGF 1α ) and endothelin-1 (ET-1) in plasma were determined using enzyme-linked immunosorbent assay. The right femoral arteries were studied by hematoxylin and eosin staining and immunohistochemical analysis to determine pathological changes and overexpression of tumor necrosis factor (TNF)–α and inducible nitric oxide synthase (iNOS) in the femoral artery walls of TAO rats. Results Salvianolic acid B significantly decreased the expressions of TXB 2 and ET-1 and increased the expression of 6-keto-PGF 1α in plasma, and significantly inhibited the overexpression of TNF-α and iNOS in the femoral artery walls of TAO rats at medium and high doses. Conclusion Salvianolic acid B has a protective effect on TAO rats. The mechanism may involve inhibition of thrombosis and TAO-associated inflammatory responses, which may explain the success of RSMA treatment of TAO in humans in traditional Chinese medical practice. Hence, it may be a potential drug for TAO treatment in conventional medicine.
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PubMed
高影响因子
COMBUSTION AND FLAME
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2019
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IF 4.12
Long Cheng,Hongtao Yang,Yue Yang,Yifan Li,Yingyi Meng,Yanchun Li,Dongming Song,Houhe Chen,Ramón Artiaga
The application of boron in fuel-rich solid propellant is limited by its long combustion time, ignition delay and low combustion efficiency. To overcome these problems, B/Nitrocellulose (NC)/Fe particles were fabricated by electrospraying. The reactivity and combustion behavior of B/NC/Fe particles were characterized by TG/DSC, oxygen bomb calorimeter and laser ignition. Compared with pure boron, lower oxidation temperature was observed in the thermal analysis of prepared particles. Meanwhile, the prepared particles released more heat and ignite more readily during the combustion. Furthermore, B/NC/Fe particles were added into Hydroxyl-terminated polybutadiene (HTPB)/Ammonium perchlorate (AP) propellants as additives to test their combustion performance. The burning rate of propellants in air and closed bomb were both improved by 8.20% and 117%, respectively. Overall, B/NC/Fe particles not only show the superior reaction performance, but also contribute to the tunable burning rate of propellants.
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高影响因子
Materials
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2019
·Vol. 12
·期 23
·3948
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IF 2.972
Lingfang Qiu,Zhiwei Zhou,Mengfan Ma,Ping Li,Jinyong Lu,Yingying Hou,Xiangshu Chen,Shuwang Duo
Novel visible-light responded aluminosilicophosphate-5 (SAPO-5)/g-C3N4composite has been easily constructed by thermal polymerization for the mixture of SAPO-5, NH4Cl, and dicyandiamide. The photocatalytic activity of SAPO-5/g-C3N4is evaluated by degrading RhB (30 mg/L) under visible light illumination (λ > 420 nm). The effects of SAPO-5 incorporation proportion and initial RhB concentration on the photocatalytic performance have been discussed in detail. The optimized SAPO-5/g-C3N4composite shows promising degradation efficiency which is 40.6% higher than that of pure g-C3N4. The degradation rate improves from 0.007 min−1to 0.022 min−1, which is a comparable photocatalytic performance compared with other g-C3N4-based heterojunctions for dye degradation. The migration of photo-induced electrons from g-C3N4to the Al site of SAPO-5 should promote the photo-induced electron-hole pairs separation rate of g-C3N4efficiently. Furthermore, the redox reactions for RhB degradation occur on the photo-induced holes in the g-C3N4and Al sites in SAPO-5, respectively. This achievement not only improves the photocatalytic activity of g-C3N4efficiently, but also broadens the application of SAPOs in the photocatalytic field.Keywords:g-C3N4;SAPO-5;composite;photocatalytic;visible light
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高影响因子
APPLIED CATALYSIS A-GENERAL
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2022
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IF 5.723
Wen Lu,Chen Wang,Yanan Han,Yuxuan Bai,Siyi Wang,Wenke Xi,Jianjun Wang
Covalent organic frameworks (COFs) have been widely used based on their ordered pore structure, inherent porosity, high specific surface area and excellent stability. Herein, the active two-dimensional COF (named HDU-25) photocatalyst was preformed by the solvothermal method, and the structure and morphology were characterized and analyzed. The effects of key factors on rhodamine B (RhB) degradation by HDU-25 were evaluated. The results showed that under suitable conditions, HDU-25 exhibited an excellent photocatalytic degradation rate of 99.9% for persulfate-assisted photocatalytic degradation of RhB, and HDU-25 also had superior stability and reusability. In addition, the mechanism of RhB degradation was investigated using free radical capture experiments and electron spin resonance (ESR) experimental analysis. The intermediates were detected by high performance liquid chromatography-mass spectrometry (HPLC-MS), and possible degradation pathways were suggested. The results of this research highlight the potential of HDU-25 photocatalysts to degrade organic dyes in wastewater.
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高影响因子
JOURNAL OF NATURAL PRODUCTS
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2016
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IF 3.662
Jing-Jun Zhao,Yan-Qiong Guo,De-Po Yang,Xue Xue,Qin Liu,Long-Ping Zhu,Sheng Yin,Zhi-Min Zhao
Bioassay-guided fractionation of an ethanolic extract of Chloranthus japonicus led to the isolation of the known lindenane-type sesquiterpenoid chlojaponilactone B (1). This compound exhibited pronounced inhibition of nitric oxide (NO) production in lipopolysaccharide (LPS)-induced RAW 264.7 macrophages. Further anti-inflammatory assays showed that 1 suppressed the levels of some key inflammation mediators, such as iNOS, TNF-α, and IL-6, in a dose-dependent manner, and reduced the ear thickness and neutrophil infiltration in 12-O-tetradecanoylphorbol-13-acetate (TPA)-stimulated mice. A mechanistic study revealed that compound 1 exerted its anti-inflammatory effects via the suppression of the NF-κB signaling pathway, which inhibited NF-κB-dependent transcriptional activity, IκBα phosphorylation, and p65 nuclear translocation. In contrast, chlojaponilactone B (1) was found to exert little influence on the MAPK signaling pathway.
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PubMed
高影响因子
EUROPEAN JOURNAL OF MEDICINAL CHEMISTRY
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2018
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IF 4.816
Hong-Jin Tang,Wei Li,Mei Zhou,Li-Ying Peng,Jin-Xin Wang,Jia-Huang Li,Jun Chen
Xanthine oxidase, which catalyzes the oxidative reaction of hypoxanthine and xanthine into uric acid , is a key enzyme to the pathogenesis of hyperuricemia and gout. In this study, for the purpose of discovering novel xanthine oxidase (XO) inhibitors, a series of 2-arylbenzo[ b ]furan derivatives ( 3a - 3d , 4a - 4o and 6a - 6d ) were designed and synthesized. All these compounds were evaluated their xanthine oxidase inhibitory and antioxidant activities by using in vitro enzymatic assay and cellular model. The results showed that a majority of the designed compounds exhibited potent xanthine oxidase inhibitory effects and antioxidant activities, and compound 4a emerged as the most potent xanthine oxidase inhibitor (IC 50 = 4.45 μM). Steady-state kinetic measurements of the inhibitor 4a with the bovine milk xanthine oxidase indicated a mixed type inhibition with 3.52 μM K i and 13.14 μM K is , respectively. The structure-activity relationship analyses have also been presented. Compound 4a exhibited the potent hypouricemic effect in the potassium oxonate-induced hyperuricemic mice model. A molecular docking study of compound 4a was performed to gain an insight into its binding mode with xanthine oxidase. These results highlight the identification of a new class of xanthine oxidase inhibitors that have potential to be more efficacious in treatment of gout.
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PubMed
高影响因子
FOOD CHEMISTRY
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2023
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IF 8.8
Lili Yin,Kunpeng Gao,Xiangzhao Mao,Yang Hu
Lipase B from Candida antarctica (CALB) plays a prominent role as a biocatalyst in several industries, especially for biphasic conversion of functional lipids. Herein, an amphiphilic Janus halloysite nanosheet (JHNS) was fabricated and employed simultaneously as a solid surfactant for stabilizing Pickering emulsion and as a carrier for immobilizing CALB, with the aim to realize highly efficient biphasic bioconversion. The obtained JHNS could stabilize Pickering emulsion for at least 7 days. Immobilization of CALB on JHNS improved the substrate affinity, catalytic efficiency, thermal stability, and alkaline tolerance of the enzyme. Moreover, JHNS-based immobilized CALB was exploited as a biocatalytic platform for the conversion of retinyl acetate, with almost twice increase in conversion efficiency. Taken together, the JHNS-based immobilized CALB paves the way for the design of efficient biphasic conversion system for the production of added-value lipids.
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高影响因子
JOURNAL OF ORGANIC CHEMISTRY
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2023
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IF 3.6
Yuan Li,Jiamei Shen,Yawei Shen,Yanfeng Li,Kai Luo,Lei Wu
A novel and efficient tandem SN2 nucleophilic substitution/Dieckmann condensation reaction of α-iodomethyl phosphine oxide with methyl thiosalicylate derivatives has been developed by using NaOH as a base, which enables the expeditious synthesis of 2-phosphonyl-3-hydroxybenzo[b]thiophene derivatives in moderate to high yields under simple conditions. This research provides not only a convenient method for the functionalization of benzo[b]thiophenes at the 2-position and 3-position but also new organophosphorus molecules. Furthermore, several new phosphonyl-substituted benzo[b]thiophenes were obtained from the resultant 2-phosphonyl-3-hydroxybenzo[b]thiophenes.
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高影响因子
CHEMOSPHERE
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2020
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IF 5.778
Tianchan Zang,Hao Wang,Yinghao Liu,Li Dai,Shuang Zhou,Shiyun Ai
The disposal and management of waste sludge is a considerable challenge for environmental protection and resource utilization. Herein, sludge-based biochar material loaded with nano-Fe 3 O 4 (xS@Fe-y) was fabricated via hydrothermal carbonization process and employed as catalyst to activate peroxymonosulfate (PMS) for degrading organic dyes in wastewater. Benefiting from the proper iron content, porous structure and the good dispersibility of iron on the catalyst surface, the proposed 5S@Fe-500 catalyst not only exhibited excellent catalytic activity and durability in the activation of PMS to degrade Rhodamine B (RhB), which was almost completely removed in 10 min (50 mL 50 mg L −1 ), but also performed broad application prospects in pollutant degradation . More importantly, the free radical quenching test and electron spin-resonance spectroscopy (ESR) detection demonstrated that O 2 • - , SO 4 • - , OH and 1 O 2 were generated during the process of catalyst activation of PMS. Based on this, a possible reaction pathway for degrading RhB with the aid of 5S@Fe-500 was put forward. It is believed that this work offers a promising reuse method of converting the waste sludge to a high efficiency and low-cost nano magnetic catalyst to activate PMS for degrading refractory organic pollutants in aquatic surroundings.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2023
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IF 5.8
Zhong Dengjie,Liu Peng,Liu Yi,Xu Yunlan
The Zn/Fe@N-doped porous graphitic carbon catalyst (Zn/Fe@PCN) was successfully produced through one-step pyrolysis of g-C 3 N 4 and Zn/Fe-MOF and was used for the activation of persulfate (PS) for the degradation of RhB. The Zn/Fe@PCN/PS system was able to degrade 95.92% of RhB in 30 min at a rate of 0.6453 min −1 when RhB was concentrated at 50 mg L −1 . The efficient degradation of RhB is primarily realized through the synergistic activation of PS by Zn, Fe, and N to produce reactive oxygen species 1 O 2 , \(\cdot{\mathrm{O}}_2^-\) , \(\cdot \mathrm{SO}_4^-\) , and ·OH. Zn 0 /Fe 0 in Zn/Fe@PCN forms a galvanic cell with carbon to release electrons to join in the activation of PS. The doping of Zn not only provides sufficient electrons for the activation of PS but also promotes the effective reduction of Fe 2+ and thus the Fe 2+ /Fe 3+ cycle. The N doping accelerates the electron transfer during the reaction progress.
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高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Xiao-Hui Yang,Guo-Hua Zhang
In this study, ultrafine borides powders including (W,Mo)B, (W,Mo)B 2.5 and (Mo,W)AlB were successfully fabricated via boronizing ultrafine W-Mo solid solution composite powder with B 4 C as the boron source under the assistance of Ca melt or Al melt. Ultrafine W-Mo solid solution powder was obtained by using a two-stage reduction route to reduce the precursor powder synthesized by spray drying. Meanwhile, the effects of Mo/W ratio on the phase composition, morphological characteristics and particle size distribution of boride solid solution composite powder were thoroughly investigated. The shift of diffraction peak in the XRD spectrum, the linear change of lattice constant and the homogeneous distributions of W, Mo, B and Al in the EDS energy spectrum comprehensively confirmed that the boride solid solution with different Mo/W ratios could be prepared. Due to the essentially insolubilities of W and Mo in Ca melt, the (W, Mo)B grains grew following a template growth mechanism, and inherited the nearly spherical morphology feature of ultrafine W-Mo solid solution composite powder with a particle size of approximately 200 nm. Nonetheless, as a result of the high solubilities of W, Mo, and B in Al melt, the process of dissolution-precipitation led to the formations of flaky (W, Mo)B 2.5 and short rod-shaped (Mo, W)AlB.
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