JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yanyan Cui,Ping Zhang,Mengke Li,Chengcheng Lin,Yaling Wang
Photocatalysis technology is considered an effective way to solve the problem of water pollution and energy shortage, and is hinged on the development of the photocatalyst . In this study, p-type semiconductor AgFeO 2 and the n-type photocatalyst Ag 3 VO 4 formed a p-n junction via a simple hydrothermal method . Compared with pure Ag 3 VO 4 , the 4 % AgFeO 2 -modified Ag 3 VO 4 photocatalyst (AgVFe-4) exhibited the best photocatalytic activity: the photodegradation rate of RhB reached 95.1 % within 60 min and possessed good photostability under UV–visible light irradiation. The physical and chemical properties of AgVFe-4 indicated that the composite structure showed a larger special surface area, much lower intensity of photoluminescence , and higher photogenerated carriers separation efficiency. The p-type AgFeO 2 and n-type Ag 3 VO 4 could form the p-n junction structure. Based on the analysis of reactive agents, the h + , •O 2 − and •OH were the main active species during organic pollutions photodegradation, and the photocatalysis process followed the Z-scheme mechanism. Meanwhile, some silver element in the photocatalyst was reduced into Ag 0 , which could act as the recombination center of the photogenerated carriers, further improving the photocatalytic performance. This work may arouse an increasing interest in designing more Z-scheme silver-based p-n junction heterojunction photocatalysts.
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Nature Communications
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2022
·Vol. 13
·期 1
·1-11
·
IF 17.694
Wan Xin,Liu Qingtao,Liu Jieyuan,Liu Shiyuan,Liu Xiaofang,Zheng Lirong,Shang Jiaxiang,Yu Ronghai,Shui Jianglan
Simultaneously increasing the activity and stability of the single-atom active sites of M–N–C catalysts is critical but remains a great challenge. Here, we report an Fe–N–C catalyst with nitrogen-coordinated iron clusters and closely surrounding Fe–N 4 active sites for oxygen reduction reaction in acidic fuel cells. A strong electronic interaction is built between iron clusters and satellite Fe–N 4 due to unblocked electron transfer pathways and very short interacting distances. The iron clusters optimize the adsorption strength of oxygen reduction intermediates on Fe–N 4 and also shorten the bond amplitude of Fe–N 4 with incoherent vibrations. As a result, both the activity and stability of Fe–N 4 sites are increased by about 60% in terms of turnover frequency and demetalation resistance. This work shows the great potential of strong electronic interactions between multiphase metal species for improvements of single-atom catalysts.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Xinyu Ma,Yingjuan Zhang,Shuwei Cai,Xianru He
Copolymers of N-vinylpyrrolidone (NVP) and methyl acrylate (MA) were prepared via reversible addition-fragmentation chain transfer (RAFT) polymerization, which exhibited typical lower critical solution temperature (LCST) behavior in aqueous solution. The molecular structure and composition of copolymer P(NVP-co-MA) were characterized by FTIR and NMR. The response behavior was investigated by UV transmittance tests. The LCST of the copolymer P(NVP-co-MA) can vary from 17 °C to 90 °C by adjusting the ratio of the two monomers, showing a wide tunable range. The dynamic light scattering (DLS) results showed that beyond LCST, the hydrodynamic size increased with increasing temperature, polymer molecular chains aggregated in solution, and solubility deteriorated, confirming its LCST responsiveness. In addition, the copolymer P(NVP-co-MA) is salt responsive as well as pH-responsive. The multi-responsive and biocompatible copolymer has a large potential application in the fields of materials and biomedicine.
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Stem Cell Research & Therapy
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2022
·Vol. 13
·期 1
·1-16
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IF 8.079
Meng Zhaosong,Liu Jiacheng,Feng Zhipeng,Guo Shuling,Wang Mingzhe,Wang Zheng,Li Zhe,Li Hongjie,Sui Lei
Background Dental follicle stem cells (DFSCs) show mesenchymal stem cell properties with the potential for alveolar bone regeneration. Stem cell properties can be impaired by reactive oxygen species (ROS), prompting us to examine the importance of scavenging ROS for stem cell-based tissue regeneration. This study aimed to investigate the effect and mechanism of N-acetylcysteine (NAC), a promising antioxidant, on the properties of DFSCs and DFSC-based alveolar bone regeneration.Methods DFSCs were cultured in media supplemented with different concentrations of NAC (0–10 mM). Cytologic experiments, RNA-sequencing and antioxidant assays were performed in vitro in human DFSCs (hDFSCs). Rat maxillary first molar extraction models were constructed, histological and radiological examinations were performed at day 7 post-surgery to investigate alveolar bone regeneration in tooth extraction sockets after local transplantation of NAC, rat DFSCs (rDFSCs) or NAC-treated rDFSCs.Results 5 mM NAC-treated hDFSCs exhibited better proliferation, less senescent rate, higher stem cell-specific marker and immune-related factor expression with the strongest osteogenic differentiation; other concentrations were also beneficial for maintaining stem cell properties. RNA-sequencing identified 803 differentially expressed genes between hDFSCs with and without 5 mM NAC. “Developmental process (GO:0032502)” was prominent, bioinformatic analysis of 394 involved genes revealed functional and pathway enrichment of ossification and PI3K/AKT pathway, respectively. Furthermore, after NAC treatment, the reduction of ROS levels (ROS, superoxide, hydrogen peroxide), the induction of antioxidant levels (glutathione, catalase, superoxide dismutase), the upregulation of PI3K/AKT signaling (PI3K-p110, PI3K-p85, AKT, phosphorylated-PI3K-p85, phosphorylated-AKT) and the rebound of ROS level upon PI3K/AKT inhibition were showed. Local transplantation of NAC, rDFSCs or NAC-treated rDFSCs was safe and promoted oral socket bone formation after tooth extraction, with application of NAC-treated rDFSCs possessing the best effect.Conclusion sThe proper concentration of NAC enhances DFSC properties, especially osteogenesis, via PI3K/AKT/ROS signaling, and offers clinical potential for stem cell-based alveolar bone regeneration.
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高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 21
·5579-5589
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IF 7.779
Shiyu Yang,Ruizi Li,Zhentao Nie,Hongjian Zhang,Yu Zhang,Jixin Zhu
2D N-doped V2O3 (N-V2O3) nanosheets were fabricated as anode materials for Li-ion batteries by a facile sol–gel method and a subsequent deoxidation–nitridation strategy. Benefiting from the 3D V–V tunnel structure, sufficient active sites and nitrogen modifications, N-V2O3 nanosheets exhibit improved Li+ diffusion kinetics, robust structure and enhanced conductivity. As a result, N-V2O3 nanosheets show a high specific capacity, long cycling life and high rate capability (136 mA h g−1 even after 1000 cycles at 2 A g−1) as anode materials for Li-ion batteries. It is instructive to note that the efficient Li+ storage of N-V2O3 is dominated by intercalation pseudocapacitance. In the mechanism of intercalation pseudocapacitance, lithium ions are intercalated into the 3D V–V tunnels and adsorbed to the V–O active sites without crystalline phase transition. This mechanism combines long cycling life with short charging/discharging times, which is suitable for stable and ultrafast Li-ion storage.
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JOURNAL OF CATALYSIS
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2022
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IF 8.047
Feiying Tang,Guangji Zhang,Liqiang Wang,Jianhan Huang,You-Nian Liu
Engineering unsymmetrical coordination is an efficient strategy for improving the performance of carbon supported single-atom catalysts for diverse applications. However, the exploration of this strategy to prepare carbon supported single-atom catalysts for hydrogenation reaction is still in infancy, especially for hydrogenation of quinolines. Herein, we report a protein-metal-ion-network strategy for preparation of single-atom cobalt supported on hierarchically porous carbon (SA-Co/NSPC). SA-Co/NSPC features unsymmetrically N/S-coordinated metal center, i.e., Co 1 –N 3 S 1 . Moreover, the carbon matrices possess an ultra-thin two-dimensional morphology and hierarchically porous structures. SA-Co/NSPC catalyst with Co 1 –N 3 S 1 active site exhibits excellent catalytic performance for hydrogenation of N-heterocycles. The DFT calculation results show that the site of Co 1 –N 3 S 1 reveals a significant electron redistribution in comparison to the Co 1 –N 4 , leading to a lower H* diffusion barrier and quinoline hydrogenation reaction barrier. SA-Co/NSPC catalyst combined with the unique hierarchically porous structure and high active Co 1 –N 3 S 1 owns extraordinary catalytic performance for hydrogenation of quinolines.
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NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 36
·17358-17366
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IF 3.925
Xudong Zheng,Ang Li,Jie Hua,Yuzhe Zhang,Jian Rong,Jinfeng Mei,Man Zhou,Zhongyu Li
The vigorous development of rare earth elements has become particularly important for the recycling and reuse of rare earth waste solutions. We use the specific coordination of the phosphate group and La3+ to recover and separate La3+ from secondary resources. First of all, cellulose nanocrystals should be phosphorylated by using phosphoric acid in an aqueous medium. Phosphoric acid groups are introduced to the surface of the cellulose nanocrystal, and then poly-N-isopropylacrylamide is introduced for modification. The purpose is to increase the mechanical properties of the material. The material was characterized by scanning electron microscope, transmission electron microscope, Fourier infrared spectroscopy, N2 adsorption–desorption analysis, and thermogravimetric and static adsorption experiments. The results of the static adsorption experiments show that the maximum adsorption capacity is 92.28 mg g−1 when the pH is 7.0. After recycling the material five times, the material could still have 87.24% of the maximum adsorption capacity.
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Frontiers in Pharmacology
·
2022
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IF 5.988
Gao Tianshu,Xu Jin,Xiao Yuxiao,Li Jiaqi,Hu Weifeng,Su Xiaoyu,Shen Xudong,Yu Wan,Chen Zhen,Huang Baosheng,Li Honglei,Wang Xing
Objective: To observe the antioxidative effects of N-(9,10-anthraquinone-2-ylcarbonyl) xanthine oxidase inhibitors (NAY) in vitro and in vivo models of hyperuricemia and explore the mechanism.Methods: A classical experimental method of acute toxicity and a chronic toxicity test were used to compare the toxic effects of different doses of NAY in mice. The hyperuricemia mouse model was established by gavage of potassium oxonate in vivo. After treatment with different doses of NAY (low dose: 10 mg/kg, medium dose: 20 mg/kg, and high dose: 40 mg/kg) and allopurinol (positive drug, 10 mg/kg), observe the levels of uric acid (UA), creatinine (CRE), and urea nitrogen (BUN) in urine and serum, respectively, and detect the activities of xanthine oxidase in the liver. The hyperuricemia cell model was induced by adenosine and xanthine oxidase in vitro. The cells were given different doses of NAY (50, 100, and 200 μmol/L) and allopurinol (100 μmol/L). Then the culture supernatant UA level of the medium was measured. The next step was to detect the xanthine oxidase activity in the liver and AML12 cells, and the levels of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), interleukin-1β (IL-1β), and NOD-like receptor thermal protein domain-associated protein 3 (NLRP3) inflammatory factors in the kidney and serum of mice. Western blot was used to detect xanthine oxidase protein expression in mouse liver tissue and AML12 cells, ASC, Caspase-1, NLRP3, GLUT9, OAT1, and OAT3 protein expression in mouse kidney tissue and HK-2 cells. Hematoxylin–eosin staining was used to stain the liver and kidney tissues of mice and observe the tissue lesions.Results: NAY had little effect on blood routine and biochemical indexes of mice, but significantly reduced the serum UA level. NAY significantly reduced the level of UA in hyperuricemia mice and cells by inhibiting xanthine oxidase activity and reduced the levels of TNF-α, IL-6, and other inflammatory factors in serum and kidney of mice. NAY can inhibit inflammation by inhibiting the NLRP3 pathway. In addition, NAY can downregulate GLUT9 protein expression and upregulate OAT1 and OAT3 protein expression to reduce the UA level by promoting UA excretion and inhibiting UA reabsorption.Conclusion: These findings suggested that NAY produced dual hypouricemic actions. On the one hand, it can inhibit the formation of UA by inhibiting xanthine oxidase inhibitors activity, and on the other hand, it can promote the excretion of UA by regulating the UA transporter. It provides new ideas for the development of hyperuricemia drugs in the future.
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Nanomaterials
·
2022
·Vol. 12
·期 13
·2213
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IF 5.719
Yafei Hou,Xiaodan Pei,Yuancheng Wang,Luyuan Zhang,Xiaohui Wei,Hongyan Mao,Wuduo Zhao,Shusheng Zhang,Wenfen Zhang
The aromatic structure and the rich nitrogen content of polymers based on covalent triazine-based frameworks (CTF) and their unique hydrophilic-lipophilic-balanced adsorption properties make them promising candidates for an adsorbent that can be used for sample pretreatment. Herein, a new covalent triazine-based framework (CTF-DBF) synthesized by a Friedel–Crafts reaction was used for the determination of the content of nucleotides in commercial infant formula. It was shown that the synthetic materials had an amorphous microporous structure, a BET surface area of up to 595.59 m2/g, and 0.39 nm and 0.54 nm micropores. The versatile adsorption properties of this material were evaluated by quantum chemistry theory calculations and batch adsorption experiments using five nucleotides as probes. The quantum chemistry results demonstrated that CTF-DBF can participate in multiple interactions with nucleotides. All the analyses performed present good linearity with R2> 0.9993. The detection limits of targets ranged from 0.3 to 0.5 mg/kg, the spiked recoveries were between 85.8 and 105.3% and the relative standard deviations (RSD, n = 6) were between 1.1 and 4.5%. All these results suggest that this versatile CTF-DBF has great potential for sample pretreatment.Keywords:covalent triazine-based frameworks;solid-phase extraction;nucleotides
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenhao Yang,Zhicong Ni,Bingnan Deng,Jiyue Hou,Rongwei Huang,Dan You,Keyi Wei,Yiyong Zhang,Xue Li,Yingjie Zhang
Lithium-sulfur batteries is regarded as one of the most promising battery systems for the next generation because of its high energy density , low cost and environmental friendliness. However, the high solubility of long-chain polysulfides leads to low active sulfur utilization and strong shuttle effect, resulting in a rapid decline in battery capacity and poor cycle performance, which seriously hinders the practical application of lithium-sulfur batteries (LSB). In this work, we devised a simple method to prepare N-doped Sponge Carbon (SC), which has a rich three-dimensional connection structure, high electronic conductivity, and reasonable N-doped composition. Applied as the interlayer of lithium-sulfur batteries, the N-doped Sponge Carbon (SC) can adsorb long-chain LiPSs dissolved in the electrolyte and accelerate the conversion of long-chain LiPSs to short-chain ones, thereby realizing the secondary utilization of dissolved active sulfur and inhibiting the shuttle effect. Therefore, the lithium-sulfur batteries with a supplemental interlayer provided a large reversible capacity of 834.27 mAh g −1 at 0.5 C and maintained the high specific capacity of 804.9 mAh g −1 after 100 cycles, the capacity attenuation rate was as low as 0.035% per cycle. In addition, when the rate increased to 2 C, the discharge-specific capacity of 618.18 mAh g −1 can still be obtained. Most importantly, this Sponge Carbon interlayer may be of great significance for the commercial application of the high-performance lithium-sulfur batteries.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2022
·Vol. 26
·期 10
·2133-2142
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IF 2.747
Xu Lu,Sun Wanzhou,Zhu Aiping
To solve the volume expansion problem of Fe 3 O 4 nanoparticles (nmFe 3 O 4 ), a facile, green, and industrializable preparation of N-doped carbon–encapsulated nmFe 3 O 4 (nmFe 3 O 4 @N-doped C) is designed. This nmFe 3 O 4 @N-doped C is prepared through pyrolysis in nitrogen atmosphere of nmFe 3 O 4 encapsulated by polyaniline (PANI@nmFe 3 O 4 ) which is obtained through oxidative polymerization of aniline on the surface of nmFe 3 O 4 . In comparison with the capacity (113 mAh g −1 at 0.1C) of nmFe 3 O 4 , the nmFe 3 O 4 @N-doped C electrode exhibits a high reversible capacity of 400 mAh g −1 after 500 cycles. Even at 4C, the nmFe 3 O 4 @N-doped C electrode presents 160 mAh g −1 capacity, which is much higher than 30 mAh g −1 of the nmFe 3 O 4 electrode. The results suggest that the N-doped carbon shell layer obtained from PANI is effective to inhibit volume expansion of nmFe 3 O 4 core and maintain the electron and ion transport channels after long cycles.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Zheng Liu,Ruonan Jia,Yang Jian,Feng Chen,Guilong Yan,Dongxu He
The occurrence of corrosion can’t be completely eliminated. To prevent the failure of structural materials, corrosion has to be easily identified, visualized and detected at early-stage, in order to intervene at the point where it is necessary. In this view, fluorescent N-doped CDs have been synthesized to synergistically inhibit and monitor corrosion of iron. The as-prepared CDs were fabricated by simple solvothermal process using citric acid as carbon source and ammonia as dopant . It is found that the active groups on the surface of the CDs promote the formation of adsorption film of CDs on iron plates and effective fluorescence emission . As a result, the CDs could readily inhibit the corrosion of iron and exhibit an inhibition efficiency of 88 % at 180 mg/L. As the degree of corrosion increases, the CDs-adsorption film can sensitively, visually and effectively respond to released Fe 3+ due to the complexation between CDs and Fe 3+ . Due to this dual function of CDs for corrosion monitoring and inhibition, they can readily trace early-stage corrosion and prevent its development. This is a synergistic strategy to prevent critical engineering failures and to ensure the safety of structural metal materials.
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