NEW JOURNAL OF CHEMISTRY
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2020
·Vol. 44
·期 48
·21183-21191
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IF 3.288
Pengyao Yu,Sheng Liu,Yuchen Cui,Kun Sun,Ling Zhang,Hailing Guo,Yongming Chai,Chenguang Liu,Lili Fan,Ge Yang,Chunzheng Wang,Svetlana Mintova
A uniform bimetallic hollow ZnFe–N/C (80–180 nm) electrocatalyst is synthesized using a precursor ZnFe-ZIF-8 (100–200 nm) subjected to pyrolysis in an argon atmosphere at 800 °C for 2 hours. The ZnFe–N/C catalyst was deposited on a glassy carbon electrode (GCE), and exhibited a superior electrocatalytic activity with a high onset potential (0.97 V vs. RHE) and half-wave potential (0.85 V vs. RHE), high stability in an alkaline electrolyte, and remarkable resistance to methanol. The high performance of the ZnFe–N/C-3 electrocatalyst is attributed to the hollow structure containing metallic Fe/Fe3C and N doping.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Yiwen Luo,Xue Huang,Yan Li,Yuqi Fu,Ziyou Wang,Jinfeng Lu,Jing Zhang
In this study, calcined Cu-based metal-organic frameworks impregnated with nickel nitrate and pyrrole (CuNiN@C) with better stability and degradation performance was synthesized by doping of both Ni and N. Coupling with peroxymonosulfate (PMS), CuNiN@C worked as adsorptive bifunctional catalyst in effectively degradation of norfloxacin (NFX). Scanning electron microscopy (SEM) with energy dispersive X-ray spectrometry (EDS), transmission electron microscope (TEM), Selected area electron diffraction (SAED), High resolution transmission electron microscope (HRTEM) and X-ray diffraction (XRD) were applied for the preliminary characterization of the synthesized material to reveal the complete retention of the octahedral particle shape and successful doping of nitrogen. The results showed that over 80% NFX (5 mg/L) was degraded in 30 min with CuNiN@C (0.2 g/L) and PMS (2 mmol/L), and the reusability of CuNiN@C in four cycles did not significantly deteriorated, which was attributed to Ni doping. The mechanism of NFX degradation was separated into two parts: adsorption of CuNiN@C and activation of PMS. CuNiN@C adsorption followed a pseudo-second order rate model (R 2 = 0.99), and nitrogen doping caused multiple electron-withdrawing functional groups in order to achieve chemisorption. Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption of both the pre-test and post-test CuNiN@C were adopted in the adsorption mechanism investigation. Meanwhile, as the activate sites of CuNiN@C, Cu and Ni responded to the PMS activation, and three radicals may be generated during the activation. Radical quenching experiments and Electron Paramagnetic Resonance (EPR) illustrated that the hydroxyl radical ( OH) plays a major role in NFX oxidation, which was confirmed by the effect of pH value experiment. According to results of the liquid chromatograph linked to a mass spectrometer (LC-MS), possible degradation pathways are proposed: the substitution reactions and elimination reactions on both quinolone and benzene rings, the destruction of the piperazinyl group and the opening of the quinolone ring. This study provides new insight into the fabrication and application of the CuNiN@C/PMS system as antibiotic pollution remedy in aquatic environment.
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CEMENT AND CONCRETE RESEARCH
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2020
·
IF 8.328
Xin Liu,Pan Feng,Wei Li,Guoqing Geng,Jiale Huang,Yun Gao,Song Mu,Jinxiang Hong
Calcium silicate hydrate (C-S-H), the most important Portland cement hydration product , determines the mechanical properties and durability of cementitious materials . In marine environment, C-S-H often suffers from sulfate attack – one of the most common and severe degradations for concrete. pH is considered as a critical factor in determining the deterioration behavior of C-S-H during sulfate attack, of which the significance may be overlooked. This study focused on the role of pH on the deterioration of C-S-H in terms of the composition and nano/micro structure under sulfate attack. The results show that lowering pH aggravates the decalcification of C-S-H, whereas a strong alkaline condition is beneficial to increase the resistance to deterioration. An increase in the mean chain length together with the proportion of large pores (>10 nm) is observed when C-S-H is subjected to low-pH sulfate attack (pH = 10–12), resulting in a relatively loose structure. The deep analysis on defective tobermorite model reveals that calcium at the interlayer of C-S-H nanostructure is readily removed under sulfate attack, thereby improving the potential of Si-O-Si groups formation and increases the mean chain length of C-S-H.
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RSC Advances
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2020
·Vol. 11
·期 1
·501-509
·
IF 3.119
Shan Huang,Ming Lu,Lei Wang
Based on cytochrome c-multiwalled carbon nanotubes (Cyt c-MWCNTs) and cobalt metal–organic frameworks/gold nanoparticles (Co-MOFs/AuNPs), an electrochemical biosensor was proposed for the detection of nitrite. Herein, Co-MOFs and AuNPs were immobilized on gold electrodes via surface layer assembly. Their advantages including large surface area and high conductivity provided an excellent platform for the immobilization of Cyt c-MWCNTs. Cyt c-MWCNTs were prepared via electrostatic adsorption and possessed good biocompatibility and superior electrocatalytic activity towards nitrite. Notably, MWCNTs and AuNPs could provide a good microenvironment for the electron transfer of Cyt c, which further significantly promoted the dispersion of MWCNTs. All of the above features led to outstanding electrochemical performance and achieved signal amplification for nitrite detection. Therefore, the biosensor displayed a linear range from 0.005 μmol L−1 to 1000 μmol L−1 with a detection limit of 0.0044 μmol L−1 for nitrite detection. In addition, the designed biosensor exhibited excellent selectivity and could be applied in real samples.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2020
·Vol. 21
·期 21
·8207
·
IF 4.556
Yi-Cong Luo,Pu Jing
Accumulation of amyloid fibrils in organisms accompanies many diseases. Natural extracts offer an alternative strategy to control the process with potentially fewer side effects. In this study, the inhibition of C-phycocyanin fromSpirulina sp.on amyloid formation of bovine serum albumin (BSA) during a 21-day incubation was investigated using fluorescence and circular dichroism (CD), and mechanisms were explored via kinetic fitting and molecular docking. C-phycocyanin (0–50 µg/mL) hindered the amyloid formation process of BSA with increased half-lives (12.43–17.73 days) based on fluorescence intensity. A kinetic model was built and showed that the k1decreased from 1.820 × 10−2d−1to 2.62 × 10−3d−1with the increase of C-phycocyanin, while k2showed no changes, indicating that the inhibition of BSA fibrillation by C-phycocyanin occurred in a spontaneous process instead of self-catalyzed one. CD results show that C-phycocyanin inhibited conformational conversion (α-helices and β-sheets) of BSA from day 6 to day 18. Molecular docking suggested that C-phycocyanin may hinder BSA fibrillation by hydrogen-bonding > 6 of 27 α-helices of BSA in a gomphosis-like structure, but the unblocked BSA α-helices might follow the self-catalytic process subsequently.Keywords:C-phycocyanin;blue food pigment;secondary interaction;fibrillation;non-covalent interaction
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Yuanming Deng,Xi Zou,Zairan Liu,Jinzhi Wang,Zhong Wang,Jiaoning Tang
Here we present a simple method to prepare a highly efficient three components nanocomposites via thermal degradation of layered double metal hydroxides (LDHs)@polyvinyl alcohol (PVA) composites. Co 7 Fe 3 /CoFe 2 O 4 @C obtained from this method is applied to activate peroxymonosulfate (PMS) to degrade polluted organics and showed excellent performance. The best removal RhB efficiency of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) is near 100% within 10 min and the lowest ions elution (∼0.05 mg/L) under pH = 7, which is also better than the performance of the precursor Co–Fe LDH. Through further cycling experiments and degradation of p -nitrophenol, the stability and catalytic performance of the catalyst were verified. Finally, free radical scavenging experiments prove ·OH and SO 4 · - radicals participating in the reaction, which are the key factors for degradation. Based on the above, the derivation of the mechanism of Co 7 Fe 3 /CoFe 2 O 4 @C (Co/Fe = 1:1) catalyzing PMS to degrade polluted organics was proposed, and we consider this catalyst has great application prospect.
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RSC Advances
·
2020
·Vol. 10
·期 54
·32309-32322
·
IF 3.119
Fahim A. Qaraah,Samah A. Mahyoub,Abdo Hezam,Wei Zhang,Guangli Xiu,Janvier Munyaneza,Chengzi Wu
Significant endeavors have been devoted in the past few years to establish efficient visible light-activated photocatalysts. Herein, we successfully synthesized a flower-like hierarchical nitrogen-doped and carbon-sensitized Nb2O5 (NBO) nanostructure (denoted N-NBO/C). The as-prepared N-NBO/C possessed a specific surface area of 260.37 m2 g−1 and single wire diameter of less than 10 nm. The effect of reaction parameters such as hydrothermal reaction time, temperature and concentration of hexamethylenetetramine (Hmta) on the morphology of NBO was systematically investigated to elucidate the growth mechanism. The carbon on the surface and the nitrogen in the framework of NBO are beneficial for light harvesting, visible light absorption, formation of oxygen vacancies, and electron–hole separation. The photocatalytic performance of the as-fabricated N-NBO/C nanostructures was estimated via the photodegradation of 30 mg L−1 RhB, where greater than 98% of RhB was decomposed within 30 min upon visible-light radiation. Hence, the obtained N-NBO/C nanostructure exhibits much higher photocatalytic activity for the decomposition of RhB upon visible light irradiation than that of pure niobium oxide (NBO), nitrogen-doped titanium oxide (N-TIO), and nitrogen-doped niobium oxide (N-NBO). This work supplies a versatile route for the synthesis of nitrogen-doped and carbon-sensitized metal-oxide nanostructures for possible utilization in solar energy transformation and environmental remediation.
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JOURNAL OF MATERIALS SCIENCE
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2021
·Vol. 56
·期 10
·6337-6348
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IF 4.22
Liu Nan,He Wenjie,Liao Haojie,Li Zhiwei,Jiang Jiangmin,Zhang Xiaogang,Dou Hui
Abstract Silicon-based materials, as the most promising candidates for high-performance lithium-ion batteries (LIBs), have been widely researched. However, the construction of stable electrode structure is still a challenge due to the enormous volume variation. Herein, we developed a three-dimensional (3D) binder network, polydopamine grafted cross-linked polyacrylamide (PDA-c-PAM), to build a durable anode for LIBs. The flexible PDA side chain in PDA-c-PAM offers the superior adhesion with constitutes of the electrode. And the 3D cross-linked PAM main chain endows PDA-c-PAM high stretchability to accommodate the volume variation of active material and maintain the structural integrity of electrode. As a binder for SiO/graphite (SiO/C), the fabricated SiO/C@PDA-c-PAM anode delivers an initial discharge capacity of 1350 mAh g −1 at 0.1 A g −1 . At a high current density of 1 A g −1 , it maintains 591 mAh g −1 after 300 cycles with a 94% capacity retention of initial capacity after activation. Coupled with commercial LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) cathode, the full cell exhibits a high-energy density of 406 Wh kg −1 at 1 C as well as excellent stability. Thus, it is believed that designing 3D network binder is an effective approach to achieve superior cycle performance of SiO/C electrodes. Graphical abstract We successfully synthesized a polydopamine grafted cross-linked polyacrylamide (PDA-c-PAM) polymer as binder for SiO/C anode to maintain the structural integrity and improve the cycling stability of electrode. The flexible PDA side chain in PDA-c-PAM offers the binder superior adhesion. And the 3D cross-linked PAM main chain endows the binder high stretchability. The fabricated SiO/C@PDA-c-PAM anode delivers a capacity of 591 mAh g −1 after 300 cycles at 1 A g −1 . Thus, it is believed that designing 3D network binder is an effective approach to achieve superior cycle performance of SiO/C electrodes.
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JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
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2020
·Vol. 106
·期 2
·526-538
·
IF 5.399
Wu Ying-Ting,Ma Si-Yu,Sun Wen-Qin,Shen Wei-Wei,Zhu Hui-Ting,Zhang Qin,Chen Hui-Fen
BackgroundEndometriosis (EM) is a benign gynecological disease that shares some characteristics with malignancy, such as proliferation and invasion. So far, the pathogenesis of EM is still unclear. In this study, we investigated whether TRIM65 can play a role in the development of EM.MethodsTRIM65 expression levels in eutopic, ectopic, and normal endometrium were detected by quantitative real-time PCR and Western blot. Cell proliferation and invasion of primary endometrial stromal (EMS) cells were detected by CCK-8 and Transwell analysis. The interaction between TRIM65 and DUSP6 or C-myc was measured by coimmunoprecipitation, ubiquitylation, dual luciferase, and chromatin immunoprecipitation analysis.ResultsWe found that TRIM65 was identified as an up-regulated gene in ectopic endometrial tissues and EMS cells compared with control groups without EM. TRIM65 expression was positively correlated with the levels of p-ERK1/2, C-myc, matrix metalloproteinase-2, and integrin β1 in ectopic endometrial tissues in patients and mice. TRIM65 promoted the cell proliferation and invasion of EMS cells via the ERK1/2/C-myc pathway through ubiquitination of DUSP6. C-myc promoted TRIM65 expression through inducing TRIM65 promoter activity. Additionally, the increased expression of TRIM65, C-myc, matrix metalloproteinase-2, integrin β1, and p-ERK1/2 and the decreased expression of DUSP6 in ectopic endometrial tissues were significantly suppressed by inhibition of ERK1/2 signaling pathway in ectopic endometrial tissues in experimental mice model.ConclusionIn conclusion, TRIM65 promotes invasion of ectopic EMS cells by activating a feedback loop with the ERK1/2/C-myc signaling pathway and may be a potential therapeutic target for EM.
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Journal of Materials Chemistry B
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2020
·Vol. 8
·期 32
·7160-7165
·
IF 5.344
Tao Hu,Kangkai Xu,Shanhu Qiu,Yu Han,Juan Chen,Jian Xu,Ke Chen,Zilin Sun,Hong Yi,Zhonghua Ni
A sensitive fluorescent microfluidic sensor based on carbon quantum dots (CQDs), cadmium telluride quantum dots (CdTe QDs) aerogel and glucose oxidase (GOx) for urinal glucose detection was fabricated via a simple method. CQDs, emitting green fluorescence (emission peak at 520 nm) and the CdTe QDs, emitting red fluorescence (emission peak at 620 nm) under 365 nm ultraviolet irradiation, were synthesized. The as-prepared CQDs, CdTe QDs and GOx (C/CdTe QD-GOx) were mixed in a certain ratio and were then introduced into the microfluidic chip to construct a three-dimensional porous aerogel sensor after freeze-drying. A ratiometric fluorescence response was realized through the quenching of the red fluorescence by H2O2 produced from the glucose/GOx reaction, while the green fluorescence intensity stays constant. A small change in the ratio of the two fluorescence intensities led to a clear change in the fluorescent colour of the sensor, which can be easily observed under a UV lamp. The microsensor displayed a serial colour change from red to green with the changes in glucose concentration. The intensity ratio between the red fluorescence and green fluorescence (R/G value) indicates the glucose concentration. In our experiments, the optimal concentration ratio of CdTe QDs and CQDs was 0.5 : 1, and the optimal response time was 5 min. The detection range of glucose concentration was from 0 mM to 13 mM, and the detection limit was 0.223 mM. We also found that this glucose sensor has excellent selectivity, specificity and stability. The as-prepared microsensor can be stably stored for 30 days under −20 °C. Such a C/CdTe QD-GOx aerogel based microfluidic assay sensor provides a new approach towards the optical and quantitative detection of glucose, which enables daily urine glucose monitoring for the diabetic patients in a convenient way.
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FISH & SHELLFISH IMMUNOLOGY
·
2020
·
IF 0
Xiaorong Xu,Kai Liao,Peng Shi,Jilin Xu,Zhaoshou Ran,Chengxu Zhou,Lin Zhang,Jiayi Cao,Xiaojun Yan
Bivalve lectins perform a crucial function in recognition of foreign particles, such as microalgae and pathogenic bacteria. In this study, a novel C-type lectin form Sinonovacula constricta ( ScCL ) was characterized. The full-length cDNA of ScCL was 1645 bp, encoding a predicted polypeptide of 273 amino acids with one typical carbohydrate-recognition domain. ScCL has the highest similarity and closest phylogenetic relationship with the C-type lectin from Solen grandis . Real-time PCR analysis showed that ScCL was expressed in all tested tissues, with the highest expression in the foot and the lowest expression in hemocytes . Agglutination activity of ScCL was Ca 2+ -independent. ScCL showed the strongest agglutination on Chlorella vulgaris , the modest agglutination on Platymonas subcordiformis , Nannochloropsis sp., and Thalassiosira pseudonana , the weakest agglutination on Chaetoceros sp., and no agglutination on Isochrysis zhanjiangensis . Meanwhile, agglutination tests and western blot analysis revealed that the recombinant ScCL protein could agglutinate Staphylococcus aureus and Vibrio harveyi , but could not agglutinate Vibrio anguillarum , Bacillus cereus , or Vibrio parahaemolyticus . Furthermore, ScCL had a high binding activity with LPS and mannose , a low binding activity with LTA, and no binding activity with PGN. The expression of ScCL in the gill of S. constricta fed with C. vulgaris and T. pseudonana was significantly increased at 1 and/or 3 h. After injection with S. aureus , the expression of ScCL in the gill was significantly increased at 3, 6, and 24 h. These results indicated that ScCL was involved in food particle recognition and immunity of S. constricta .
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ENVIRONMENTAL POLLUTION
·
2020
·
IF 6.793
Shukun Le,Weishan Yang,Gonglai Chen,Aoyu Yan,Xiaojing Wang
The carbon dots (C-dots) mediated Sn 2 Ta 2 O 7 /SnO 2 heterostructures with spongy structure were successfully assembled by simple hydrothermal route. The photocatalytic removal efficiency of amoxicillin (AMX, 20 mg L −1 ) over C-dots/Sn 2 Ta 2 O 7 /SnO 2 was estimated to reach up 88.3% within 120 min simulated solar light irradiating. Meanwhile, the HPLC-MS/MS analysis and density functional theory (DFT) computation were examined to clarify the photo-degradation pathway of AMX. The mechanism investigation proposed that with the modification of C-dots, the photocatalysts improves the utilization of solar energy by harvesting the long wavelength solar light due to their unique up-converted photoluminescence (UCPL). In addition, the porous spongy structure and plenty of tiny C-dots promote the ability of adsorption by enlarged specific surface area. Furthermore, the C-dots mediated Z-type heterojunction of Sn 2 Ta 2 O 7 /SnO 2 facilitates the efficient separation and transfer of photo-induced carriers. Our work affords a promising approach for the design of the high-efficient photocatalysts to remedy poisonous antibiotics in aqueous environment.
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