ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 33
·80817-80827
·
IF 5.8
Huang Guofu,Wang Mianmian,Sun Xinying,Liu Haijian,Liu Fangfang
In this work, pomegranate peel extracts were used as the green reducing agent to synthesize Cu/Fe nanoparticles (P-Cu/Fe nanoparticles) and removed tetrabromobisphenol A (TBBPA) in aqueous solution. P-Cu/Fe nanoparticles were amorphous and irregularly spherical. The surfaces of nanoparticles contained Fe 0 , Fe 3+ oxides (hydroxides), and Cu 0 . The bioactive molecules from pomegranate peel were extremely important for the synthesis of nanoparticles. P-Cu/Fe nanoparticles had excellent removal performance for TBBPA, and 98.6% of TBBPA (5 mg L −1 ) was removed within 60 min. The removal reaction of TBBPA by P-Cu/Fe nanoparticles was well-fitted with the pseudo-first-order kinetic model. The Cu loading was critical for TBBPA removal with an optimum value of 1.0 wt%. A weakly acidic condition (pH 5) was more favorable for the removal of TBBPA. The removal efficiency of TBBPA increased with the rise of temperature and decreased with increasing initial TBBPA concentration. The activation energy ( E a ) was 54.09 kJ mol −1 , indicating that the removal of TBBPA by P-Cu/Fe nanoparticles was mainly surface-controlled. Reductive degradation was the main mechanism of TBBPA removal by P-Cu/Fe nanoparticles. In conclusion, green synthesized P-Cu/Fe nanoparticles using pomegranate peel waste show great potential for the remediation of TBBPA in aqueous solution.
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JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 30
·期 1
·1-11
·
IF 3.061
Guo Ying,Wan Ying,Zhang Yang,Pan Guoyuan,Wang Jing,Yu Hao,Du Xueli,Zhao Muhua,Zhao Guoke,Li Yu,Liu Yiqun
The scarcity of freshwater is one of the challenges faced by humanity today. Solar desalination technology is gaining increasing attention due to its environmental friendliness and sustainability. However, the service life of the evaporator is significantly reduced by the problem of salt deposition during the evaporation process. In this work, a porous Janus evaporator with asymmetric wettability was fabricated using an atomization-assisted non-solvent induced phase separation method. The bottom surface of the Janus evaporator was fabricated with polyacrylonitrile and polyvinylpyrrolidone, working as capillary "pumps" to ensure adequate water supply. The upper surface was made of polyvinylidene fluoride which endows the evaporator with self-floating properties and the addition of CNTs improves its solar-to-vapor conversion efficiency. The micro-nano composite continuous porous structure of the Janus evaporator is beneficial to the enhancement of the capillary action, leading to good salt-repellent performance. The solar-to-vapor efficiency of the seawater desalination experiment under 1 kW·m −2 of sunlight was 81.61%, and the water evaporation rate was 1.30 kg·m −2 ·h −1 . In addition, the evaporator exhibited excellent stability under multiple cycles. It also functioned well in the treatment of organic wastewater. This work provides a novel method for preparing solar desalination materials.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 7
·5331-5342
·
IF 2.993
Segovia Rubén,Ding Leyan,Jiang Hu,Miao Peng,Sun Xiudong,Shi Hongyan,Gao Bo
CH 3 NH 3 PbI 3 (MAPbI 3 ) exhibits distinctive properties for applications in photovoltaics, light emitting devices, photodetectors, and fuel cells. The working temperature of an optoelectronic device affects the photophysical properties of the active material, which is closely related to the device performance. In MAPbI 3 , these properties are intimately connected with its crystalline structure which is temperature dependent. Here, we study the photoluminescence (PL) behavior of MAPbI 3 microwires (MWs) under recursive tetragonal-to-cubic and cubic-to-tetragonal phase transitions induced by temperature cycles from 40 °C (tetragonal phase) to 80 °C (cubic phase). MWs emission exhibited an initial redshift in wavelength by increasing the temperature from the tetragonal to the cubic phase, but after several thermal cycles, this trend reversed and the emission blueshifted. In both phases independently, the emission blueshifted and became stronger with increasing the cycles. The results indicate a thermal cycling-dependent PL and a gradual crystalline structure deformation due to a reiterated change in the MWs lattice, which implies variation in the electronic bandgap along the heating–cooling process. The alteration of the electronic band structure was corroborated by thermal cycling-reflectance measurements. The awareness behavior of material properties upon phase transitions and temperature fluctuations is of great importance for the optimization of optoelectronic devices.
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APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 108
·期 1
·1-11
·
IF 3.9
Li Na,Wang Yuan,Meng Yinyin,Lv Yangyong,Zhang Shuaibing,Wei Shan,Ma Pingan,Hu Yuansen,Lin Hui
Abstract Old yellow enzymes (OYEs) have been proven as powerful biocatalysts for the asymmetric reduction of activated alkenes. Fungi appear to be valuable sources of OYEs, but most of the fungal OYEs are unexplored. To expand the OYEs toolbox, a new thermophilic-like OYE ( Af OYE1) was identified from Aspergillus flavus strain NRRL3357. The thermal stability analysis showed that the T 1/2 of Af OYE1 was 60 °C, and it had the optimal temperature at 45 °C. Moreover, Af OYE1 exhibited high reduction activity in a wide pH range (pH 5.5–8.0). Af OYE1 could accept cyclic enones, acrylamide, nitroalkenes, and α, β-unsaturated aldehydes as substrates and had excellent enantioselectivity toward prochiral alkenes (> 99% ee). Interestingly, an unexpected ( S )-stereoselectivity bioreduction toward 2-methylcyclohexenone was observed. The further crystal structure of Af OYE1 revealed that the “cap” region from Ala132 to Thr182, the loop of Ser316 to Gly325, α short helix of Arg371 to Gln375, and the C-terminal “finger” structure endow the catalytic cavity of Af OYE1 quite deep and narrow, and flavin mononucleotide (FMN) heavily buried at the bottom of the active site tunnel. Furthermore, the catalytic mechanism of Af OYE1 was also investigated, and the results confirmed that the residues His211, His214, and Tyr216 compose its catalytic triad. This newly identified thermophilic-like OYE would thus be valuable for asymmetric alkene hydrogenation in industrial processes. Key points
A new thermophilic-like OYE AfOYE1 was identified from Aspergillus flavus, and the T 1/2 of AfOYE1 was 60 °C
AfOYE1 catalyzed the reduction of 2-methylcyclohexenone with (S)-stereoselectivity
The crystal structure of AfOYE1 was revealedv
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高影响因子
Journal of the Australian Ceramic Society
·
2023
·Vol. 59
·期 4
·915-922
·
IF 1.9
Zhang Jianxiong
ZrO 2 is widely used. However, surface hydrophilicity is harmful to waterproof devices. In this work, epoxy-based polyhedral oligomeric silsesquioxane (POSS) was chemically bonded to ZrO 2 sheet surface for weather-resistant hydrophobicity and anti-adherence property. First, ZrO 2 sheet was modified with hydroxyls, followed by amino modification. Then, surface POSS modification was performed via ring-opening addition. Next, composition and micro-morphology of POSS-treated sheet were clarified. Ultimately, the dependence of water contact angle of POSS-modified sheet on POSS solution treating time was researched, and the highest contact angle of 132.6° was gained by 24-h treating. Acid corrosion, alkali corrosion, and ultraviolet radiation for 48 h were employed to verify good weather resistance with contact angles over 120°. POSS-modified sheet had good anti-adherence capacity. Cooperation of POSS and ZrO 2 was utilized to obtain low surface energy and high surface roughness. This work might help to obtain hydrophobic ceramics as catalyst supports for oil-phase reactions.
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JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Wang Yaru,Li Shuhuai,Ma Xionghui,Pang Chaohai,Wu Yuwei,Wang Mingyue,Li Bei,Liu Sixin
Fluorescence intensity and selective recognition ability are crucial factors in determining the analytical techniques for fluorescent probes. In this study, a core–shell fluorescent material, composed of silver nanoparticles@nitrogen-doped graphene quantum dots (Ag NPs@N/GQDs), was synthesised using mango leaves as the raw material through a thermal cracking method, resulting in strong fluorescence luminescence intensity. By employing noradrenaline as a template molecule and using a surface molecular imprinting technique, a molecularly imprinted membrane (MIP) was formed on the surface of the fluorescent material, that was subsequently eluted to obtain a highly specific, fluorescent probe capable of recognising noradrenaline. The probe captured various concentrations of noradrenaline using the MIP, which decreased the fluorescence intensity. Then a method for detecting trace amounts of noradrenaline was established. This method exhibited a linear range from 0.5 –700 pM with a detection limit of 0.154 pM. The proposed method was implemented in banana samples. Satisfactory recoveries were confirmed at four different concentrations. The method presented a relative standard deviation (RSD) of less than 5.0%.
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高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2024
·Vol. 54
·期 8
·1807-1817
·
IF 2.4
Shang Ling-Jun,Yu Shuai-Qun,Shang Xin-Wei,Wei Xiang-Yu,Wang Hui-Ying,Jiang Wen-Shuai,Ren Qiong-Qiong
Regular monitoring of blood glucose levels is crucial in diabetes management. Commonly used procedures may be invasive and can lead to cross-infection and inflammation. Therefore, a safe, non-invasive blood glucose-monitoring technology is needed. Herein, a 3D reduced graphene oxide (rGO) electrode was modified with MXene (Ti 3 C 2 ) and gold nanoparticles (AuNPs) to construct a non-invasive, saliva glucose detection electrode. The Au/rGO-Ti 3 C 2 electrode exhibited good detection performance for glucose concentrations in the range of 10 µM–21 mM at a working potential of 0.6 V, with a detection limit of 3.1 µM glucose, and a sensitivity of 355 µA mM −1 cm −2 . The Au/rGO-Ti 3 C 2 electrode showed almost no response to the addition of interfering substances, and no effect was observed upon subsequent glucose detection. The sensor could detect glucose in artificial saliva and saliva supernatant. The modified electrode showed a significant response to low glucose concentrations, even at 10 µM. These results indicate the suitability of the Au/rGO-Ti 3 C 2 electrode for saliva glucose detection. The electrode developed in this study has great potential in improving the efficiency of diabetes monitoring through pain-free, non-invasive glucose detection in saliva. Graphical abstract
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高影响因子
TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 3
·1-14
·
IF 2.566
Liu Chenxu,Meng Yonggang,Tian Yu
Abstract The active control of friction in oil-based lubricants was realized in the present study with the use of MoS 2 particle additives and the application of an electric field. By modifying the surface charging state of the MoS 2 particles, the dependence of potential-controlled boundary lubrication behavior on the electrical properties of the particles was demonstrated. For a diethyl succinate lubricant containing negatively charged MoS 2 particles, the coefficient of friction (COF) was reduced by 60–70% when a positive potential was applied to a lower friction pair of copper plates. After modification with poly(diallyldimethylammonium chloride), the particles were positively charged, and the COF was reduced with the application of a negative potential. The mechanisms underlying the potential control of the COF were investigated by observing the distributions of the particle additives and characterizing the tribofilms formed at different potentials. Most of the charged particles were locally concentrated near the opposite pole, and this was reversed when the electric field changed. For locally high concentrations of MoS 2 particles, a MoS 2 /MoO x tribofilm with a thickness of 100–500 nm and a loose structure formed on the lower friction pair, which significantly decreased the shear force during the friction process. Graphical Abstract
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Nutrition & Diabetes
·
2024
·Vol. 14
·期 1
·1-9
·
IF 4.6
Li Hui,Fang Yujiao,Wang Da,Shi Bowen,Thompson Garth J.
Background Quantitative mapping of the brain’s metabolism is a critical tool in studying and diagnosing many conditions, from obesity to neurodegenerative diseases. In particular, noninvasive approaches are urgently required. Recently, there have been promising drug development approaches for the treatment of disorders related to glucose metabolism in the brain and, therefore, against obesity-associated diseases. One of the most important drug targets to emerge has been the Glucagon-like peptide-1 (GLP-1) and its receptor (GLP-1R). GLP and GLP-1R play an important role in regulating blood sugar and maintaining energy homeostasis. However, the macroscopic effects on brain metabolism and function due to the presence of GLP-1R are unclear. Methods To explore the physiological role of GLP-1R in mouse brain glucose metabolism, and its relationship to brain function, we used three methods. We used deuterium magnetic resonance spectroscopy (DMRS) to provide quantitative information about metabolic flux, fluorodeoxyglucose positron emission tomography (FDG-PET) to measure brain glucose metabolism, and resting state-functional MRI (rs-fMRI) to measure brain functional connectivity. We used these methods in both mice with complete GLP-1R knockout (GLP-1R KO) and wild-type C57BL/6N (WT) mice. Results The metabolic rate of GLP-1R KO mice was significantly slower than that of WT mice ( p = 0.0345, WT mice 0.02335 ± 0.057 mM/min, GLP-1R KO mice 0.01998 ± 0.07 mM/min). Quantification of the mean [ 18 F]FDG signal in the whole brain also showed significantly reduced glucose uptake in GLP-1R KO mice versus control mice ( p = 0.0314). Observing rs-fMRI, the functional brain connectivity in GLP-1R KO mice was significantly lower than that in the WT group ( p = 0.0032 for gFCD, p = 0.0002 for whole-brain correlation, p < 0.0001 for ALFF). Conclusions GLP-1R KO mice exhibit impaired brain glucose metabolism to high doses of exogenous glucose, and they also have reduced functional connectivity. This suggests that the GLP-1R KO mouse model may serve as a model for correlated metabolic and functional connectivity loss.
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PubMed
高影响因子
JOURNAL OF FLUORESCENCE
·
2024
·
IF 2.6
Peng Fei,Ai Xiangnan,Bu Xiaoyu,Zhao Zixuan,Gao Baoxiang
Mitochondrial membrane potential (MMP) is crucial for mitochondrial function and serves as a key indicator of cellular health and metabolic activity. Traditional lipophilic cationic fluorescence intensity probes are unavoidably influenced by probe concentration, laser intensity, and photobleaching, limiting their accuracy. To address these issues, we designed and synthesized a pair of fluorescence molecules, OR-C8 and SiR-BA, based on the Förster Resonance Energy Transfer (FRET) mechanism, for dual-modality visualization of MMP. OR-C8 anchors to the inner mitochondrial membrane through strong hydrophobic interactions, while SiR-BA is expelled from mitochondria when MMP decreases, thereby regulating the FRET process. During MMP reduction, the fluorescence intensity and lifetime of OR-C8 increase, while the fluorescence intensity of SiR-BA decreases. By combining changes in fluorescence intensity ratio and fluorescence lifetime, dual-modality visualization of MMP was achieved. This method not only accurately reflects MMP changes but also provides a novel tool for in-depth studies of mitochondrial function and related disease mechanisms, offering significant potential for advancing mitochondrial research and therapeutic development.
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高影响因子
Carbon Letters
·
2024
·
IF 5.5
Zhu Jun,Ma Qiang,Kong Lirong,Dai Jianguo,Xu Keqiang,Chen Quanrun,Zhao Zhiguo
Graphitic nitrogen-doped carbon film/nanoparticle composite, in which the films were wrapped and separated by the nanoparticles, was prepared through a simple co-calcination route. Due to its unique porous structure and improved nitrogen content, the as-prepared electrode material could exhibit high specific capacitances of 317.5 F g −1 at 0.5 A g −1 and 200.0 F g −1 at 20 A g −1 , and stable cycling behavior with no capacitance decline after 10,000 cycles in three-electrode system. When assembled in two-electrode capacitor, its specific capacitance could be well kept at 265.5 F g −1 at 0.5 A g −1 , and thus the supercapacitor with a high energy density of 9.22 Wh kg −1 was obtained. The superior energy storage properties of the as-prepared material indicate its promising application as high-performance carbon-based electrode for supercapacitors.
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Scientific Reports
·
2024
·Vol. 14
·期 1
·1-8
·
IF 3.8
Li Xiaolu,Zhao Zhongtao,Deng Yufeng,Ouyang Dongsheng,Yang Xianfeng,Chen Shuguang,Liu Peng
Tin dioxide is regarded as an alternative anode material rather than graphite due to its high theoretical specific capacity. Modification with carbon is a typical strategy to mitigate the volume expansion effect of SnO 2 during the charge process. Strengthening the interface bonding is crucial for improving the electrochemical performance of SnO 2 /C composites. Here, SnO 2 -embedded reduced graphene oxide (rGO) composite with a low graphene content of approximately 5 wt.% was in situ synthesized via a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. The structural integrity of the SnO 2 /rGO composite is significantly improved by optimizing the Sn–O–C electronic structure with CTAB, resulting a reversible capacity of 598 mAh g −1 after 200 cycles at a current density of 1 A g −1 . CTAB-assisted synthesis enhances the rate performance and cyclic stability of tin dioxide/graphene composites, and boosts their application as the anode materials for the next-generation lithium-ion batteries.
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高影响因子
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