Advanced Sensor and Energy Materials
·
2023
·
IF 0
Zesen Lin,Changchang Dong,Wei Mu,Xiaojun Han
Although photocatalytic technology is applied in water treatment, the challenge still exists due to its low photocatalytic performance. Herein, a photocatalytic reactor coupled with nanobubbles (NBs) is developed to degrade organic pollutants in wastewater. The reactor contains Ti mesh coated with TiO 2 nanotube arrays as a photocatalyst. The introduction of NBs in the reactor increases the dissolved oxygen content to enhance photocatalytic performance. The photocatalytic reactor exhibits outstanding photocatalytic performance, and the degradation ability of Rhodamine B is 95.39% after 2 h of irradiation treatment. The reactor also shows excellent photodegradation performance for other organic pollutants, such as methylene blue (74.23%), tetracycline (68.68%), and oxytetracycline hydrochloride (64.10%). Radical trapping experiments further prove that ·O 2 − , h + and ·OH are the active species for the degradation of RhB in the photocatalytic system. Therefore, this work provides a feasible strategy to design a photocatalytic reactor coupling with nanobubbles technology for the photodegradation of organic pollutants in wastewater.
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DOI
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Weisan Fang,Ying Tang,Junqi Chen,Jie Li,Liang Fang
Two garnet-structured ceramics, Ca 3 B 2 GeV 2 O 12 (B = Mg, Mn), were synthesized using a traditional solid-state reaction method, and their sintering behavior, structures, vibrational spectra, and magnetic and microwave dielectric properties were characterized. Low permittivity ( ε r ) of 9.75 (Ca 3 Mg 2 GeV 2 O 12 ) and 11.06 (Ca 3 Mn 2 GeV 2 O 12 ), quality factor ( Q × f ) of 54,000 GHz (Ca 3 Mg 2 GeV 2 O 12 ) and 30,240 GHz (Ca 3 Mn 2 GeV 2 O 12 ), and temperature coefficient of resonant frequency ( τ f ) of −61.2 ppm/ ° C (Ca 3 Mg 2 GeV 2 O 12 ) and −66.4 ppm/ ° C (Ca 3 Mn 2 GeV 2 O 12 ) were obtained. The ε r value was correlated with the sum of the ionic polarization per unit volume. The Q × f value was associated with the part with a fully filled 3 d orbit, un-paired d electrons of B-site ion, and magnetic loss. The τ f was correlated to the bond valance at the A- and C-sites. Moreover, the fitting analysis of the far-infrared reflectance spectra of Ca 3 Mg 2 GeV 2 O 12 revealed that the active vibration modes in the low wave number range (100 - 400 cm -1 ) contributed mainly to the intrinsic microwave dielectric polarization.
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DOI
高影响因子
Surface Topography-Metrology and Properties
·
2020
·Vol. 8
·期 3
·035014
·
IF 1.613
Weiwei Zhang,Cuicui Ji,Qiang Fu,Zhongquan Shi
In this work, the structure and properties of ZrO2 nanoparticle reinforced Ni–W, Ni–B and Ni–Cu matrix nanocomposite coatings were comparatively studied. Their surface morphology, composition, microstructure, topography, hardness, wear and corrosion resistance were examined by various methods . The nanocomposites exhibit dense, nodular-like morphology with nanocrystalline structure. The results show that the ZrO2 particles have homogeneously dispersed in the nanocomposites. The formation of the protrusion structure was partly attributed to the heterogeneous distribution of the electric field. The presence of ZrO2 nanoparticles could refine the crystallite size of the Ni–W, Ni–B and Ni–Cu alloy matrix to 12.5 ± 1, 10.5 ± 0.5 and 15 ± 0.1 nm, respectively. The corrosion resistance of these nanocomposites can be improved by the incorporation of ZrO2 nanoparticles into the alloy matrix. The Ra of Ni–W/ZrO2, Ni–B/ZrO2 and Ni–Cu/ZrO2 nanocomposites are about 53 ± 3, 69 ± 2, 18 ± 1 nm, respectively, expressing the rougher surface of Ni–B/ZrO2 compared to the others. It indicated that the composition of these alloy matrix have different crystallite size, which could affect the surface roughness of the electrodeposits. The inclusion of ZrO2 particles in Ni-based alloys could enhance its properties. The reinforcement effect of the anti-wear properties of the nanocomposites was proposed. The Rct value of the Ni–W–ZrO2, Ni–B–ZrO2, Ni–Cu–ZrO2 were 50.93, 105.18, 44.67 kΩ · cm2, respectively, indicating that the Ni–B–ZrO2 nanocomposite coating has the highest corrosion resistance. The Rct values depends on not only the composition of the coatings, but also the electrodeposition conditions, which influence the crystallize size and compactness of the electrodeposits. The order of the microhardness and anti-wear properties is Ni–W–ZrO2 > Ni–B–ZrO2 > Ni–Cu–ZrO2.
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高影响因子
MEDICAL SCIENCE MONITOR
·
2018
·
IF 1.894
Zeng Li,Xiao-chang Liu,Rui Li,Jun Chang
Background Beta-secretase 1 (BACE1) is a rate-limiting enzyme in the generation of amyloid beta peptides, which are associated with Alzheimer’s disease (AD). It has been reported that Schisandrin B could improve cognitive functions in animal models of AD, but the underlying mechanisms are not completely understood. Material/Methods In this research, in order to investigate the effects of Schisandrin B on amyloid-β (Aβ) metabolism and its mechanisms, amyloid precursor protein (APP) and its proteolytic products were determined by enzyme-linked immunosorbent assay (ELISA), western blotting, and RT-PCR after incubation of N2a/Swe cells with Schisandrin B. Results The results indicated that Schisandrin B can significantly reduce the level of secretion of Aβ 40 and Aβ 42 secreted in N2a/Swe cells. Additionally, there was nonsignificant change in APP level after Schisandrin B treatment. Treatment of Schisandrin B dramatically reduced the mRNA and protein expression levels of BACE1. Moreover, Schisandrin B treatment resulted in a reduction of protein level of sAPPβ, an APP fragment cleavage by BACE1. Conclusions These results suggest that Schisandrin B inhibits the transcription and translation of BACE1, suppresses the activity of BACE1, and ultimately attenuates Aβ generation, which provides a novel mechanism for the regulation of Aβ metabolism by Schisandrin B.
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PubMed
高影响因子
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 2
·1099-1111
·
IF 1.843
Zhang Hewei,Duan Congcong,Xu Zhen,Yin Jiahang
Herein, the C 60 /Cd 0.5 Zn 0.5 S (C 60 /CZS) photocatalysts with excellent photocatalytic performance were prepared using facile one-pot hydrothermal method. The crystal structure, morphology, photoelectric performance and photocatalytic activity of the samples were characterized by XRD, XPS, UV–Vis and electrochemistry. The catalytic degradation of pollutants under the irradiation of visible light was simulated using Rhodamine B (Rh B). The content of C 60 was changed from 0.5 to 5 wt%, and the optimal value for the photocatalytic activity was determined to be 2 wt%. The apparent degradation rate and degradation efficiency of Rh B were 0.024 min −1 and 97.5% within 140 min, which is 3.4 times that of pure CZS. C 60 /CZS exhibited excellent catalytic performance, and its photocatalytic activity was sustained even after three cycles. Moreover, electrochemical test results demonstrated that the separation and transfer of photocarriers on CZS surface were effectively improved by C 60 , thus enhancing its activity. In this study, we innovatively prepared a novel photocatalyst by combining fullerenes with sulfide solid solution for the first time, which has rarely been studied in the past. The synthetic method is simple, efficient and pollution-free. Subsequently, the catalytic degradation of Rh B experiment confirmed that the catalyst has high catalytic efficiency and stability. This experiment has practical significance not only for the catalytic degradation of Rh B but also for the application of fullerene in photocatalysis.
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Yina Jia,Jianrong Tang,Yunfu Dang,Yizhou Yang,Shan He,Yue Jiang,Yong Wang,Juntao Feng,Zhiqing Ma,Xili Liu,He Yan
Lansiumamide B (LB) is a cinnamamide alkaloid isolated from Clausena lansium seeds. The compound is the main antifungal ingredient found in C. lansium . In this paper, the antifungal activity of LB against 10 plant pathogenic fungi was evaluated and found that it was the most effective to Rhizoctonia solani (EC 50 = 2.99 μg/mL). The compound also exhibits certain protective (53.06%) and curative (71.01%) activities against R. solani at 800 μg/mL. The mechanism of action of LB was further elucidated through physiological and biochemical experiments, mycelial morphology and ultrastructure observations, and transcriptomics studies with R. solani as the experimental strain. SEM and TEM observation showed that it caused abnormal mycelium growth, extravasation of contents and cell wall degradation. Physiological and biochemical tests showed that LB treatment had no significant effect on the cellular respiration of mycelium , but it could increase the membrane permeability , cause the leakage of intracellular electrolyte, reduce the content of extracellular polysaccharide and chitin in cell wall and increased the contents of intracellular reducing sugar. The results of transcriptome sequencing analysis showed that LB had significant effects on polysaccharide and oligosaccharide related metabolic pathways, such as starch and sucrose metabolic pathways, galactose metabolic pathways, and amino sugar metabolic pathways. Furthermore, LB treatment increased the specific enzyme activity of α-1, 4-glucanase, α-1,6-glucanase, cellulase and maltase of R. solani in vivo . Comprehensive analysis of the above experimental results shows that LB induces and regulates the degradation of polysaccharides and oligosaccharides of R. solani at the transcriptional level, thereby destroying the cell wall structure and ultimately leading to the death of fungi.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 2
·739-746
·
IF 3.591
Tao Wang,Xiqing Liu,Mei Liu,Runhua Liao,Hongquan Zhan,Xiaoxue Qi,Yongqing Wang,Yanju Huang
Black TiO2 and metal–organic frameworks (MOF) are great materials with light-harvesting ability, redox power and consequently catalytic activity. Here, the integration of MIL-100(Fe) with TiO2(B) composite was designed for photocatalytic application, which greatly promoted light-harvesting and charge transfer. As expected, the integrated TiO2(B)/MIL-100(Fe) composite showed high photocatalytic activity due to unique Fe–O–Ti bonds that were constructed, which acted as an electronic tunnel to reduce electronic transfer resistance between MIL-100(Fe) and TiO2(B). In addition, the presence of Fe–O clusters in MIL-100(Fe) can also promote the charge dissociation and improve catalytic activity via the Fe3+/Fe2+ redox cycle. This achievement would help us to understand and design charge transfer pathways in the integration of MOF/semiconductor photocatalysts.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 6
·2331-2338
·
IF 2.914
Gong Jianqiu,He Chun,Zhang Jinlong,Wang Lingzhi
Photocatalytic treatment of water pollutants has attracted extensive attention due to its low energy consumption, low cost and the avoidance of secondary environmental pollution. However, most photocatalysts are in powder form, which makes it difficult to separate from the water system after the reaction. Especially in practical applications, the recycling of the catalyst is an important part. Based on the characteristics that sodium alginate (SA) is easy to form gels under mild conditions, GO-P25@SA gel beads were prepared. The catalyst can be separated from the water system by simple filtration, which greatly saves the recycle cost. Besides, the light response of TiO 2 (P25) and excellent conductivity of graphene oxide (GO) make GO-P25@SA have excellent photocatalytic degradation and cyclic stability for rhodamine B (RhB). In this work, the unique merits of GO and sodium alginate (SA) in developing functionalized photocatalyst were demonstrated, providing a low-cost and easy recycle treatment strategy for rhodamine B degradation.
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Nan Zhou,Yufan Wu,Yiran Li,Jiankui Yang,Qing Zhou,Yuwei Guo,Mao Xia,Zhi Zhou
As an anode with ultrahigh capacity (4200 mAh g −1 ), silicon (Si) has inherent defects, such as drastic volume change (~300%) and poor conductivity. To cope with these problems, constructing a rigid shell (e.g. TiO 2 ) on the surface of Si particles is an effective method. Typically, monoclinic titanium dioxide (TiO 2 -B) has the more excellent electrochemical performance among the various crystalline of TiO 2 (anatase, rutile, etc.) for its open channel and characteristic pseudocapacitive effect. In addition, carbon nanotubes (CNTs) are good conductor of electricity. It is hopeful to increase the conductivity of the Si anode by adding CNTs . In this work, therefore, a Si@TiO 2 -B/CNTs composite is prepared by hydrothermal method. The composite exhibits superior electrochemical properties during the half-cell test (1184 mAh g −1 under 0.1 A g −1 at 200th cycles). Furthermore, the electrochemical kinetics of the materials were studied by cyclic voltammetry, which demonstrated that coating TiO 2 -B could increase the capacitive effects of the composite (68.75%).
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高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 8
·A1660
·
IF 3.12
Yuan Cen,Sha Li,Yan Zhou,Xing Cai,Xian Wang,Qin Xiang,Bingbing Hu,Danmei Yu,Yuping Liu,Changguo Chen
With the worldwide demand for electrochemical energy storage continuing to rise, rechargeable magnesium-based batteries have received considerable attention, because of their low cost, high volumetric capacity, and dendrite-free nature. However, limited cathode options and parasitic side reactions hinder the development of magnesium-based batteries. To overcome these issues, a self-designed hybrid magnesium-lithium ion batteries using ultrathin vanadium dioxide nanosheets as the cathode, magnesium as the anode, molybdenum as the current collector and an all-phenyl complex with lithium chloride as the electrolyte was assembled in this work. The battery delivers outstanding electrochemical performance with a high reversible capacity of 275 mAh g−1, standout rate performance of 145 mAh g−1 at a current density of 4 A g−1, long cycle life and high energy density of 484 Wh kg−1. This superior electrochemical performance demonstrates the great potential of ultrathin vanadium dioxide nanosheets for application in hybrid magnesium-lithium ion batteries.
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高影响因子
FUEL
·
2014
·
IF 3.406
Shuai Liu,Wei Zhou,Tao Yu,Ruijie Chai,Liming Lu,Renhe Yin
Layered nanoporous Ti/TiO 2 /Ni–W–B electrode is prepared through electrochemical anodization and electrodeposition for electrocatalytic reduction of coal. Extensive characterizations of the layered nanoporous Ti/TiO 2 /Ni–W–B electrode have been performed using techniques including scanning electronic microscopy, X-ray diffraction, inductively coupled plasma, Brunauer–Emmett–Teller and linear sweep voltammetry. The results indicate that the electrode, which presents layered nanoporous surface network, exhibits high activity for the reduction of coal. In an organic electrolyte system, a liquefaction yield of 51.8% is obtained after electrolysis of coal on the prepared electrode for 24 h at −1.7 V. The electroreduction mechanism of coal is also investigated. IR and 1 H nuclear magnetic resonance results show that active hydrogen (H ∗ ) reacts with functional groups in the coal such as C O, C O and C C, leading to the reduction of unsaturated bonds and the breakage of bridge bonds and part of aromatic rings during the electroreduction of coal.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 24
·5722-5728
·
IF 5.317
Hainan Sun,Gao Chen,Yinlong Zhu,Bo Liu,Wei Zhou,Zongping Shao
Graphical Order up : B-site cation-ordered double perovskites Ba 2 Bi x Sc 0.2 Co 1.8− x exhibited ultrahigh catalytic activity and favorable stability for the oxygen evolution reaction (OER) in alkaline solution. The critical role of the ordered [Co 2+ ] and [Sc 3+ , Bi 5+ , Co 3+ ] dual environments account for the high OER activity, representing a new class of promising electrocatalysts applied in energy storage and conversion systems. Simple disordered perovskite oxides have been intensively exploited as promising electrocatalysts for the oxygen evolution reaction (OER) towards their application in water splitting, reversible fuel cells, and rechargeable metal-air batteries. Here, the B-site cation-ordered double perovskites Ba 2 Bi x Sc 0.2 Co 1.8− x O 6−δ , with two types of cobalt local environments, are demonstrated to be superior electrocatalysts for OER in alkaline solution, demonstrating ultrahigh catalytic activity. In addition, no obvious performance degradation is observed for the Ba 2 Bi 0.1 Sc 0.2 Co 1.7 O 6−δ sample after a continuous chronopotentiometry test. The critical role of the ordered [Co 2+ ] and [Sc 3+ , Bi 5+ , Co 3+ ] dual environments in improving OER activity is exhibited. These results indicate that B-site cation-ordered double perovskite oxides may represent a new class of promising electrocatalysts for the OER in sustainable energy storage and conversion systems.
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高影响因子
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