NEW JOURNAL OF CHEMISTRY
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2021
·Vol. 46
·期 3
·1158-1167
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IF 3.591
Huan Fu,Huan Zhang,Guichun Yang,Jun Liu,Junyuan Xu,Peihuan Wang,Ning Zhao,Lihua Zhu,Bing Hui Chen
Catalysts of 0.54% (Pt, Rh, Pd or Ru)/Co(OH)2 and 1.23% Rh/Co(OH)2 were successfully synthesized via simple hydrothermal and precipitation methods for the selective hydrogenation of nitroarenes. It was found that 0.54% Rh/Co(OH)2 outperformed other catalysts, for example, 2-chloronitrobenzene hydrogenation (with a turnover frequency (TOF) of 575 h−1) under 3.0 MPa H2 at 100 °C for 1 h (much higher than that of 1.23% Rh/Co(OH)2; TOF, 398 h−1). Through characterization of the nanostructure (XRD, TEM, HRTEM, AC-STEM (spherical aberration-corrected scanning transmission electron microscopy), AC-STEM-EDX elemental mapping and line-scanning, H2-TPD, etc.), it was confirmed that Rh was dispersed in the form of single atoms and ultrasmall nanoclusters on Co(OH)2 for 0.54% Rh/Co(OH)2. Moreover, 0.54% Rh/Co(OH)2 also exhibited high selectivity for –NO2 hydrogenation for other selected nitroarene substrates hydrogenation reactions. This was mainly attributed to the presence of Rh as single atoms or super tiny nanoclusters in 0.54% Rh/Co(OH)2, leading to a significant increase in the number of active sites, beneficial adsorption of the –NO2-group at defect-rich Co(OH)2, and an interfacial synergy effect of Rh–Co(OH)2, thus improving the catalytic performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Dengke Zhao,Shunlian Ning,Xiaolong Yu,Qikai Wu,Wei Zhou,Jiacheng Dan,Yuguang Zhu,Hao Zhu,Nan Wang,Ligui Li
The exploration of efficient bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) under alkaline conditions is an important way to promote the development of electrolytic water technology . Herein, the reduced graphene oxide-supported MoO 4 2- modified amorphous cobalt metaphosphate cubes (a-Co(PO 3 ) 2 /MoO 4 /rGO) as bifunctional OER/HER catalyst is prepared by anion exchange and phosphating, using the Prussian blue analogue (PBA) as a precursor. The resulting composite exhibits the low overpotentials (η) that of 290 and 50 mV for OER and HER in 1.0 M KOH solution at 10 mA cm −2 , respectively. The electrochemical test and density functional theory (DFT) results reveal that the MoO 4 2- -modified optimizes the adsorption/desorption energy of H* of Co(PO 3 ) 2 , thus enhance the HER activity. Benefiting from efficient HER and OER performances, an efficient and stable alkaline water electrolysis operation using a-Co(PO 3 ) 2 /MoO 4 /rGO used as bifunctional catalyst can be carried out, which can deliver a current density (j) of 20 mA cm −2 at 1.65 V cell voltage and work continuously for 24 h.
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EUROPEAN JOURNAL OF PHARMACOLOGY
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2021
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IF 4.432
Yao Hua,Limei Zhou,Weidong Yang,Wenji An,Xiaolin Kou,Jian Ren,Hailang Su,Rong Chen,Zhengping Zhang,Jianjun Zou,Zhihong Zhao
Intracerebral hemorrhage (ICH) is a devastating disease, and there is currently no specific pharmacological treatment that can improve clinical outcomes. Y-2 sublingual tablets, each containing 30 mg edaravone and 6 mg (+) - borneol , is undergoing a phase III clinical trial for treatment of ischemic stroke in China. The purpose of the present study is to investigate the efficacy and potential mechanism of Y-2 in a rat model of collagenase IV injection induced ICH. Sublingual administration of Y-2 at the dose of 1, 3 and 6 mg/kg improved ICH-induced sensorimotor dysfunction, alleviated cell death and histopathological change, restored the hippocampal long-term potentiation (LTP), reduced brain edema and maintained blood-brain barrier (BBB) integrality in ICH rats. Further study demonstrated that Y-2 could reduce inflammatory response and oxidative stress by decreasing the levels of myeloperoxidase (MPO), ionized calcium-binding adaptor protein-1 (Iba-1), inflammatory cytokines and oxidative products, inhibit transcription factor nuclear factor-κB (NF-κB) activation, cyclooxygenase-2 (COX-2) and matrix metallopeptidase 9 (MMP-9) expression in brain tissue around in the core regions of hematoma . Importantly, the protective efficacy of Y-2 from ICH-induced injury was superior to edaravone. In conclusion, Y-2 sublingual tablets might be a promising therapeutic agent for the treatment of ICH.
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JOURNAL OF MOLECULAR LIQUIDS
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2021
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IF 6.165
Xiuquan Yao,Yuming Lai,Feifei Huang,Yujie Qiang,Ying Jin
In this paper, 5,5′-Dithiobis-(2-nitrobenzoic acid) (DTNB) was used as an organic self-assembled monolayer on copper surface for the first time. The inhibition performance in 3.5 wt% NaCl solution was studied via electrochemical techniques, surface analysis methods and theoretical calculations. The influence of concentration on inhibition performance of DTNB was investigated by electrochemical impedance spectroscopy and potentiodynamic polarization. It is found that the inhibition efficiency of the self-assembled monolayer first increases and then decreases with the addition of DTNB, and the maximum inhibition efficiency is 92.4% at the DTNB concentration of 1 × 10 -3 mol·L -1 . The inhibition effect of DTNB was also evaluated by morphology observation of copper using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Raman spectroscopy, X-ray photoelectron spectroscopy and quantum chemical calculations were utilized to determine that DTNB is well bound to copper surface through chemical bonds.
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JOURNAL OF ORGANIC CHEMISTRY
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2021
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IF 4.354
Qian Chen,Xuanming Zheng,Fang Guo,Kun Liang,Fanrui Zhou
α-Aminophosphonate analogues containing a phthalazine skeleton were efficiently obtained by a new transition-metal-free addition of dialkyl phosphites to phthalazin-2-ium bromide under mild conditions. A mechanistic study using isotope labeling and radical inhibition experiment revealed that the present transformation passes through a nucleophilic addition of dialkyl phosphates, rather than an insertion of P-H to carbenes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Ziqian Lv,Hanyu Xu,Zhiying Wang,Mochen Jia,Yanling Wei,Zuoling Fu
The composite of biocompatible carbon dots (CDs) and lanthanide-based luminescent materials have high research value as a promising multifunctional material, which are ideally suited to information encryption and white LED. However, the aggregation-induced quenching of CDs in the solid state still troubles the synthesis of CDs with other solid luminescent materials. Herein, a facile strategy to fabricate polychromatic nanoplatform KLa(MoO 4 ) 2 : Eu 3+ @CDs by encapsulating CDs on the surface of KLM: Eu 3+ with silicon shell is reported, in which the aggregation-induced quenching of CDs is avoided. Due to the overlapping of Eu-O charge transfer band with CDs excitation band, the red luminescence of Eu 3+ ions and the blue fluorescence of can be emitted simultaneously under 395 nm excitation. By changing the proportion of KLa(MoO 4 ) 2 : Eu 3+ in KLa(MoO 4 ) 2 : Eu 3+ @CDs, the mixture can emit "warm", "neutral", and "cold" white light, which can realize people's demand for indoor lighting requirements. Furthermore, a multi-mode information encryption by selectively triggering the luminescence of CDs or Eu 3+ ions is also designed. All the results suggest that KLa(MoO 4 ) 2 : Eu 3+ @CDs have excellent luminescence properties that can be further investigated and applied in the field of white LEDs and information encryption.
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Foods
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2021
·Vol. 10
·期 10
·2357
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IF 4.35
Fei Li,Solju Pak,Jing Zhao,Yunlu Wei,Yuyu Zhang,Quanhong Li
A neutral pumpkin polysaccharide (NPPc) was extracted fromCucurbia moschataand its structural characterization is performed. Moreover, uptake behaviors of an NPPC were investigated at the cellular level. The results showed that NPPc, an average molecular weight (Mw) of 9.023 kDa, was linear (1→4)-α-D-Glcpresidues in the backbone, which branched point atO-6 position of (1→4,6)-α-D-Glcp. The side chain contained (1→6)-α-D-Glcpand terminal glucose. The cellular uptake kinetics results showed that the uptake of fluorescent-labeled NPPc was in time- and dose-dependent manners in Caco-2 cells. For subcellular localization of NPPc, it was accumulated in endoplasmic reticulum and mitochondrion. This study illustrates the characteristics on the uptake of NPPc and provides a rational basis for the exploration of polysaccharides absorption in intestinal epithelium.Keywords:Cucurbia moschata;polysaccharide;structural characterization;uptake characteristic
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Biosensors-Basel
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2021
·Vol. 12
·期 1
·13
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IF 5.519
Tao Peng,Xueshima Jiao,Zhanwei Liang,Hongwei Zhao,Yang Zhao,Jie Xie,You Jiang,Xiaoping Yu,Xiang Fang,Xinhua Dai
The coronavirus disease 2019 (COVID-19) pandemic caused by severe acute respiratory coronavirus 2 (SARS-CoV-2) is still raging all over the world. Hence, the rapid and sensitive screening of the suspected population is in high demand. The nucleocapsid protein (NP) of SARS-CoV-2 has been selected as an ideal marker for viral antigen detection. This study describes a lateral flow immunoassay (LFIA) based on colloidal gold nanoparticles for rapid NP antigen detection, in which sensitivity was improved through copper deposition-induced signal amplification. The detection sensitivity of the developed LFIA for NP antigen detection (using certified reference materials) under the optimized parameters was 0.01 μg/mL and was promoted by three orders of magnitude to 10 pg/mL after copper deposition signal amplification. The LFIA coupled with the copper enhancement technique has many merits such as low cost, high efficiency, and high sensitivity. It provides an effective approach to the rapid screening, diagnosis, and monitoring of the suspected population in the COVID-19 outbreak.Keywords:SARS-CoV-2;nucleocapsid protein;signal amplification;copper deposition
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INTERNATIONAL DAIRY JOURNAL
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2021
·
IF 3.032
Xin Hu,Yaping Pan,Mutai Bao,Xiuli Zhang,Chengyi Luo,Xiao Han,Fengshu Li
A novel exopolysaccharide (APS) was secreted by Chryseobacterium sp. AP-2. The yield of APS reached 3.247 g L −1 in MRS medium with 2% (w/v) maltose during 72 h incubation. The APS was a 4.871 × 10 5 Da heteropolysaccharide with rhamnose, fucose, mannose , glucose and galactose ; using Fourier transform infrared spectroscopy , the main groups in APS were found to be hydroxyl and phosphate groups. APS exhibited a flaky structure with irregular holes, and its structural composition was confirmed by 1 H and 13 C nuclear magnetic resonance analysis. The degradation temperature (197.3 °C) of APS was determined by thermogravimetric analysis. APS exhibited stable emulsification property with the higher emulsification indexes (EI) than 50% in the diesel oil and kerosene. Ultimately, physicochemical factor (temperature, pH values and salts) had an impact on rheological properties of APS. The properties and structure characterisation of APS laid the experimental foundation for further exopolysaccharide exploration.
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JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
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2021
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IF 2.993
Desheng Pan,Qifeng Kuang,Peng Tong,Wei Tong,Liubing Fan,Jing Zhao,Da Li,Chuljin Choi,Zhidong Zhang
Challenges still remain in producing room-temperature ferromagnetism/ferrimagnetism in inorganic–organic hybrid compounds. Here, we report the Fe vacancy-doped inorganic–organic (Fe x Se 2 ) 2 Fe(dien) 2 (dien = diethylenetriamine, x = 0.86) hybrid cuboids by self-assemble of finite one-dimensional (1D) FeSe 2 chains and Fe(dien) 2 complexes. A growth model is proposed by kinetically controllable syntheses of novel Fe 2x+1 Se 4 (dien) 2 hybrids. The Rietveld refinement reveals that Fe vacancies in the Fe 2.71 Se 4 (dien) 2 hybrid cuboids induce large distortions of the FeSe 2 chains and the room-temperature lattice parameters are a = 9.225(4) Å, b = 18.021(8) Å and c = 11.609(6) Å. Magnetic measurements and electron spin resonance spectra of the Fe 2.71 Se 4 (dien) 2 hybrid cuboids show the ferrimagnetism with the Curie temperature (T C ) of 600 K and the spin glass state with the freezing temperature (T f ) of 108 K. Impressive room-temperature ferrimagnetic properties of the Fe 2.71 Se 4 (dien) 2 hybrid cuboids were ascribed to the high concentration of Fe 3+ vacancies (0.29 per cell) in the hybrid cuboids, which is supported by the 57 Fe Mössbauer spectrum fitting based on the ferrimagnetic model.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2021
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IF 7.963
He Liu,Jiahao Liang,Xiaodong Du,Rui Wang,Ting Tang,Xueqin Tao,Hua Yin,Zhi Dang,Guining Lu
Organophosphorus esters (OPEs), one kind of the emerging contaminants with high frequency of detection, is rather refractory in natural environment, thus posing great threat to human health. This study investigated the feasibility and mechanism of tris(2-chloroethyl) phosphate (TCEP) degradation in thermally activated persulfate (TAP) system. Influence of impact factors, such as PDS dosage, temperature, initial pH, and presence of natural water matrix (Cl − , NO 3 − , H 2 PO 4 − , NH 4 + , humic acid), were evaluated. Results showed that 100% degradation of TCEP can be achieved in TAP system in 40 min at 60 °C. SO 4 ·− as the dominant oxidant for TCEP degradation was proved by quenching experiment and verified by EPR analysis. Alkaline condition exerted great inhibitory effect by affecting the constituents of oxidative radicals. It is suggested that Cl − and H 2 PO 4 − at lower dosages promoted the degradation by stimulating ·OH production and forming oxidative radicals with better selectivity . Intermediates identified by high resolution mass spectrometer was suggested less toxic than TCEP by ECOSAR program. Meanwhile, the illustrated oxidation mechanism mainly involved radical attack at C Cl bond and cleavage of C O bond, as further confirmed by frontier electron density calculation and wavefunction analysis. Moreover, cyclic degradation of TCEP indicated the constant release of SO 4 ·− in 450 min, suggesting high efficiency and stability of PDS in TAP system. Four selected OPEs achieved complete removal in TAP system and their degradation discrepancy was further discussed based on the distinctive structures. Altogether, TAP technology can be used as an efficient method in TCEP removal with great potential for application.
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Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Zhiyan Hou,He Meng,Xueqing Shao,Xianglong Wang,M. Usman Tahir,Shakiaz Ahmad,Chao Yang,Xintai Su,Lijuan Zhang
The complex composition and recycling process of electroplating sludge are the two major obstacles restricting the recycling of metal resources. In this work, Ni(HCO 3 ) 2 hollow spheres with unique amorphous structure were prepared via a simple and controllable hydrothermal method using nickel-containing electroplating sludge as raw material and ascorbic acid (AA) as complexing agent . The introduction of AA not only changed the morphology of the sample, but also formed pure phase Ni(HCO 3 ) 2 . The controllable amorphous structure is beneficial to the diffusion of OH - in the electrolyte. More importantly, its disordered atomic arrangement and metastable structure provide a large number of active sites and ion transmission channels, which improve the specific capacity. Consequently, amorphous Ni(HCO 3 ) 2 delivers a large capacitance of 599.8 C g −1 at 1 A g −1 , besides large capacitance, it also exhibits large rate capability (61.02% at a current density of 10 A g −1 ) and cycle performance (capacitance retention 52.09% after 1000 cycles). Importantly, the recoveries of nickel, iron and aluminum are 95.57%, 99.92% and 92.30%, respectively, indicating that electroplating sludge has a good application prospect as electrode materials for supercapacitors .
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