CATALYSIS LETTERS
·
2023
·
IF 2.8
Chen Feng,Jiao Peixin,Zhao Caixian
Single-atom photocatalysts exhibit outstanding performance in energy and environmental photocatalysis, due to their exceptional capabilities in enhancing light-harvesting, charge transfer dynamics, and surface reactions. The key to preparing single-atom photocatalysts lies in developing an appropriate metal-support that can prevent aggregation or sintering during synthetic procedures. In this work, a Co(II)-urea complexe in-situ formed in melamine was employed as single-atom Co precursors to synthesize an efficient single-atom Co decorated P doped g-C 3 N 4 (Co/PCN) photocatalyst. The high-angle annular dark field transmission electron microscope (HAADF-TEM) results indicated abundant Co single atoms were immobilized in the g-C 3 N 4 matrix. Under visible-light irradiation, the as-prepared photocatalysts show remarkably enhanced photocatalytic performance. Especially, loaded with 1.5 wt% single atoms Co, the optimized Co/PCN exhibits H 2 evolution of 892.5 µmol g −1 h −1 , which is 33 times higher than that of PCN, and even twice as much as that of Pt-loaded g-C 3 N 4 (Pt/PCN). The enhanced photocatalytic activity is ascribed to the synergistic effect between single-atom Co and P doping, which facilitates efficient light harvesting, charge separation, and migration. It is believed that this study paves a new avenue for developing high-efficiency single-atom photocatalysts. Graphical Abstract
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 11
·1-8
·
IF 2.9
Sun Luyao,Yin Jie,Liang Qiru,Gong Yanyan
Ferrous sulfide (FeS) nanoparticles have been extensively applied to remove heavy metals from soil and groundwater. This study considered the effects of aging, pH, and humic acid (HA) on the physical stability and mercury uptake of carboxymethyl cellulose stabilized ferrous sulfide nanoparticles (CMC-FeS) in simulated groundwater under anaerobic conditions. The coating of negatively charged CMC onto the surface of FeS improved the stability of FeS particles. Over aging, zeta potential and hydrodynamic diameters of CMC-FeS was increased at 60 d and then remained constant over 90 d. The dissolved Fe 2+ percentage was within the range of 1.0–1.7%. The mercury uptake was decreased from initial 3116.3 to 2972.0 mg/g (i.e., a 4.6% decrease) over 90 d. Higher pH rendered more negative CMC-FeS surfaces and lower pH led to the partial dissolution of CMC-FeS. As a result, the hydrodynamic diameters of CMC-FeS were enhanced with the increase of pH. The mercury uptake was raised sharply from 2587.0 mg/g at pH 4.2 to 3116.3 mg/g at pH 7.5–10.5. As HA concentration was increased from 0 to 10 and further to 20 mg/L, zeta potential was increased from initial -35.5 to -31.5 mV and then declined to -33.1 mV. Meanwhile, hydrodynamic diameters were increased from 327.4 to 387.7 nm and then declined to 354.8 nm. Increasing the HA from 0 to 5 mg/L decreased the mercury uptake by 9.5%. This study suggests that the physical stability of CMC-FeS and corresponding removal effectiveness of mercury should be taken into consideration for successful in situ groundwater remediation. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Chen Da,Xia Zhaoming,Guo Zhixiong,Gou Wangyan,Zhao Junlong,Zhou Xuemei,Tan Xiaohe,Li Wenbin,Zhao Shoujie,Tian Zhimin,Qu Yongquan
Inspired by structures of natural metalloenzymes, a biomimetic synthetic strategy is developed for scalable synthesis of porous Fe-N 3 single atom nanozymes (pFeSAN) using hemoglobin as Fe-source and template. pFeSAN delivers 3.3- and 8791-fold higher oxidase-like activity than Fe-N 4 and Fe 3 O 4 nanozymes. The high catalytic performance is attributed to (1) the suppressed aggregation of atomically dispersed Fe; (2) facilitated mass transfer and maximized exposure of active sites for the created mesopores by thermal removal of hemoglobin (2 ~ 3 nm); and (3) unique electronic configuration of Fe-N 3 for the oxygen-to-water oxidation pathway (analogy with natural cytochrome c oxidase). The pFeSAN is successfully demonstrated for the rapid colorimetric detection of glutathione with a low limit of detection (2.4 nM) and wide range (50 nM–1 mM), and further developed as a real-time, facile, rapid (~6 min) and precise visualization analysis methodology of tumors via glutathione level, showing its potentials for diagnostic and clinic applications.
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PubMed
高影响因子
RARE METALS
·
2023
·Vol. 43
·期 1
·113-123
·
IF 8.8
Tian Jin-Lv,Wu Lin-Rong,Zhao Hai-Jun,Xu Shou-Dong,Chen Liang,Zhang Ding,Duan Xiao-Chuan
The effect of partial substitution of Mg for Ni on a high-sodium and lithium-free layered P2-type Na 45/54 Mg 6/54 Ni 12/54 Mn 34/54 O 2 cathode with high initial Coulombic efficiency and excellent cyclic stability has been investigated in this study. Based on the crystal structural analysis, the Mg doping can retain the P2 structure up to 4.3 V, thus restraining the detrimental phase transformation of P2–O2 during the Na-ion intercalation/deintercalation process. Therefore, the obtained Mg-doped P2-type cathode exhibits a reversible specific capacity of 109 mAh·g −1 at 0.1C between 2.0 and 4.3 V and a retention rate of 81.5% after 200 cycles at 1C. In addition, the full cell consisting of Mg-doped P2-type cathode and hard carbon anode shows a capacity retention rate of 85.6% after 100 cycles. This study provides new insight into the development of durable cathode materials for sodium-ion batteries. Graphical abstract
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2023
·
IF 2.5
Chen Weiwang,Wan Mengmeng,Liu Sha,Tang Yating,Xu Qian
Melamine-crosslinked polyimide (MPI) aerogels are promising for diverse applications owing to their economical cost and impressive performance. However, MPI aerogels tend to suffer severe shrink in the processes of preparation and practical applications. Their upgrades, i.e., carbon foam-reinforced polyimide (CF-PI) aerogel composites, therefore were proposed in this study, to address this issue. The structure, thermal insulation of the resultant composites as well as their mechanical strength were characterized. The CF-PI aerogel composites were observed to have low shrinkage (as low as 9.25 vol.%) and low thermal conductivity (21 mW m −1 k −1 –34 mW m −1 k −1 ), indicative of significantly improved shape stability and exceptional thermal insulation capability. Besides, these aerogel composites also performed well in thermal stability, and did not decompose unless the temperature exceeds 400 °C. All these advantages contribute to the broad application prospects of thus aerogel composites in many aspects, such as thermal insulation for high temperatures, and so on. Graphical Abstract The composite is apparently composed of carbon foam and PI aerogel. Of the two, the carbon foam itself serves as a support frame, and PI aerogel is filled inside as the functional component. When the polymer concentration increases from 4 to 8%, the shrinkage of CF-PI aerogel composites gradually increases.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-20
·
IF 16.6
Han Xiao,Liu Lijuan,Huang Saihua,Xiao Wenfeng,Gao Yajing,Zhou Weitao,Zhang Caiyan,Zheng Hongmei,Yang Lan,Xie Xueru,Liang Qiuyan,Tu Zikun,Yu Hongmiao,Fu Jinrong,Wang Libo,Zhang Xiaobo,Qian Liling,Zhou Yufeng
N 6 -methyladenosine (m 6 A), the most prevalent mRNA modification, has an important function in diverse biological processes. However, the involvement of m 6 A in allergic asthma and macrophage homeostasis remains largely unknown. Here we show that m 6 A methyltransferases METTL3 is expressed at a low level in monocyte-derived macrophages from childhood allergic asthma patients. Conditional knockout of Mettl3 in myeloid cells enhances Th2 cell response and aggravates allergic airway inflammation by facilitating M2 macrophage activation. Loss and gain functional studies confirm that METTL3 suppresses M2 macrophage activation partly through PI3K/AKT and JAK/STAT6 signaling. Mechanistically, m 6 A-sequencing shows that loss of METTL3 impairs the m 6 A-YTHDF3-dependent degradation of PTX3 mRNA, while higher PTX3 expression positively correlates with asthma severity through promoting M2 macrophage activation. Furthermore, the METTL3/YTHDF3-m 6 A/PTX3 interactions contribute to autophagy maturation in macrophages by modulating STX17 expression. Collectively, this study highlights the function of m 6 A in regulating macrophage homeostasis and identifies potential targets in controlling allergic asthma.
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高影响因子
JOURNAL OF ELECTROCERAMICS
·
2023
·
IF 1.7
Li Wei,Li Jie,Chen Yixin,Sun Kai,Wang Shuai,Liu Yingli,Duan Zhaoyun
In this paper, the Ca 2+ ion was chosen to substitute the Mg 2+ ion of Li 2 MgSiO 4 ceramics. Li 2 Mg 1 − x Ca x SiO 4 (x = 0.0, 0.03, 0.06, 0.09, 0.12) ceramics materials were prepared by solid state reaction at low temperature (925 °C) with 2.5wt% Bi 2 O 3 sintering aid. X-ray diffraction (XRD) results showed the ceramics presented the standard Lithium Magnesium Silicate phase formation, and no secondary phases appeared. Scanning electron microscopy (SEM) suggested that Ca 2+ ions affected the densification of the prepared ceramics. Ca 2+ ion substitution resulted in increasing relative density, enhancing microwave properties. Ca 2+ ion substituted Mg 2+ ion and formed a CaO4 structure, which affected microwave dielectric properties. With the substituted amount increase, the values of dielectric constant ε’ and quality factor Q×f gradually increased, and τ f values increased from negative to positive values. When x = 0.09 and sintered at 925 °C, Ca 2+ ion substitution gave ceramics excellent microwave properties: bulk density ρ = 2.479 g/cm 3 , relative density was 98.68%, dielectric constant ε’=6.59, dielectric loss tanδ ε = 0.0018, quality factor Q×f = 8976.9 GHz and temperature coefficient τ f = 1.9 ppm/°C. This ceramic material has excellent microwave dielectric properties and holds a potential for use in integrated antenna and other electronic devices.
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JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
·
2023
·
IF 2.5
Guo Jing,Wang Hai-jing,Liu Shuang-juan,Zhang Peng,Tang Jing-yu,Zhang Wei-yang,Guo Han-jie,Wang Peng-cheng,Meng Cai
A room-temperature electrodeposition method with an organic electrolyte was developed to fabricate a HNO 3 -pretreated graphene paper Cu (GP′–Cu) composite. To improve the interfacial bonding of GP′–Cu composite, magnetron sputtering technology was used to create a “sandwich” structural gradient GP′–Cu composite. The selection of the intermediate transition layer metal was based on two-dimensional disregistry. Scanning electron microscopy, X-ray photoelectron spectroscopy, and other analytical methods confirmed that the addition of an intermediate transition metal (Cr, Ni) layer reduced the gap distance and enhanced the interfacial bonding of the GP′ and Cu deposited layers. The GP′–Ni–Cu composite exhibited the largest increase in tensile strength and conductivity. In addition, it had the highest thermal diffusivity and elongation at break among the GP′–Cu, GP′–Cr–Cu and GP′–Ni–Cu composites.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Xu Xinwu,Lu Yang,Shi Junqing,Hao Xiaoyu,Ma Zelin,Yang Ke,Zhang Tianyi,Li Chan,Zhang Dina,Huang Xiaolei,He Yibo
Seawater electrolysis is a viable method for producing hydrogen on a large scale and low-cost. However, the catalyst activity during the seawater splitting process will dramatically degrade as salt concentrations increasing. Herein, CoP is discovered that could reject chloride ions far from catalyst in electrolyte based on molecular dynamic simulation. Thus, a binder-free electrode is designed and constructed by in-situ growth of homogeneous CoP on rGO nanosheets wrapped around the surface of Ti fiber felt for seawater splitting. As expected, the as-obtained CoP/rGO@Ti electrode exhibits good catalytic activity and stability in alkaline electrolyte. Especially, benefitting from the highly effective repulsive Cl − intrinsic characteristic of CoP, the catalyst maintains good catalytic performance with saturated salt concentration, and the overpotential increasing is less than 28 mV at 10 mA cm −2 from 0 M to saturated NaCl in electrolyte. Furthermore, the catalyst for seawater splitting performs superior corrosion-resistance with a low solubility of 0.04%. This work sheds fresh light into the development of efficient HER catalysts for salinity tolerance hydrogen evolution.
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高影响因子
IONICS
·
2023
·
IF 2.8
Dai Jicui,Wang Kaipei,Han Xiaoyu,Yan Jiaxin,Teng Xiangguo
Amphoteric PSF(polysulfone)-g-NaPSS(sodium p-styrene sulfonate)/PVP (polyvinylpyrrolidone) blended ion exchange membranes were prepared by simple solution casting method with dimethyl sulfoxide (DMSO) as solvent. The effect of the ratio of PSF-g-NaPSS to PVP on the properties of the membranes were studied and compared to that of Nafion 115 (DuPont). The results proved that when the mass ratio of PSF-g-NaPSS to PVP was 3:7 (M 3:7 ), the prepared membrane has exhibited the highest ion selectivity. As a result, the VRB single cell with M 3:7 was superior to that of Nafion 115 under the same condition. Furthermore, after 300 charge-discharge cycles, the efficiency of the M 3:7 membrane has no obvious decrease, and the static chemical stability test reveals that the mass loss ratio and vanadium ion permeability loss ratio of the M 3:7 are only slightly higher than that of N 115 membrane. Consequently, the prepared PSF-g-NaPSS/PVP amphoteric membrane is one of promising candidates for VRB application.
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高影响因子
AQUACULTURE INTERNATIONAL
·
2023
·
IF 2.9
Hong Yawen,Pan Yunyun,Zhu Qijian,Li Yongyong,Yang Huicheng,Lin Bangchu,Dong Zheyun,Lou Yongjiang,Fu Shiqian
Due to high-density farming methods and poor farming environments, freshwater fish often have poor muscle texture and a fishy odor before marketing, which impacts consumer acceptance. Short-term low-salinity seawater treatment of freshwater fish before marketing has been found to improve the quality of the fish, but the mechanisms underlying this phenomenon have not yet been revealed. In this study, metabolomics technique was used based on gas chromatography-mass spectrometry (GC–MS) and ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) to screen different metabolites and predict potential metabolic pathways after treatment with low-salinity seawater. The results showed that 3838 metabolites were presented in all of the carp samples, while 62 and 64 differential metabolites were found in the comparative groups (FW, SW, and CK represented freshwater, seawater and non-transient group, respectively). Additionally, 25 and 26 metabolic pathways were enriched from these groups. Glutaric acid, PC, and creatinine might be potential biomarkers. Seawater aquaculture significantly altered the lipid metabolism, nucleotide metabolism, and amino acid metabolism of carp, enhancing its freshness and having a significant impact on its quality. This study provided insights into the metabolic changes in carp under different rearing conditions and also served as a theoretical basis for salinity treatment before freshwater fish are brought to the market.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-12
·
IF 10.2
Wu Yaguang,Zhou Zihao,Zhang Min,Li Song,Sun Mengyi,Song Zhiqiang
Atopic dermatitis (AD) is a chronic inflammatory disease associated with immune dysfunction. High levels of reactive oxygen species (ROS) can lead to oxidative stress, release of pro-inflammatory cytokines, and T-cell differentiation, thereby promoting the onset and worsening of AD. In this study, we innovatively used quaternary ammonium chitosan (QCS) and tannic acid (TA) as raw materials to design and prepare a therapeutic hydrogel(H-MnO2-Gel) loaded with hollow manganese dioxide nanoparticles (H-MnO2 NPs). In this system, the hydrogel is mainly cross-linked by dynamic ion and hydrogen bonding between QCS and TA, resulting in excellent moisture retention properties. Moreover, due to the inherent antioxidant properties of QCS/TA, as well as the outstanding H2O2 scavenging ability of H-MnO2 NPs, the hydrogel exhibits significant ROS scavenging capability. In vitro experiments have shown that H-MnO2-Gel exhibits good cellular biocompatibility. Importantly, in an AD-induced mouse model, H-MnO2-Gel significantly enhanced therapeutic effects by reducing epidermal thickness, mast cell number, and IgE antibodies. These findings suggest that H-MnO2-Gel, by effectively clearing ROS and regulating the inflammatory microenvironment, provides a promising approach for the treatment of AD.
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