Antioxidants
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2024
·Vol. 13
·期 7
·859
·
IF 6
Ruifeng Wang,Anping Ding,Jiaye Wang,Jiaxue Wang,Yujie Zhou,Miao Chen,Shuang Ju,Mingpu Tan,Zengxu Xiang
Astragalin (AG), a typical flavonoid found inThesium chinenseTurcz (T. chinense), is abundant in various edible plants and possesses high nutritional value, as well as antioxidant and antibacterial effects. In this study, we initially predicted the mechanism of action of AG with two anti-aging and antioxidant-related protein targets (CD38 and IGFR) by molecular docking and molecular dynamics simulation techniques. Subsequently, we examined the anti-aging effects of AG inCaenorhabditis elegans(C. elegans), the antioxidant effects in zebrafish, and verified the related molecular mechanisms. InC. elegans, AG synergistically extended the lifespan ofC. elegansby up-regulating the expression ofdaf-16through inhibiting the expression ofdaf-2/IGFRand also activating the AMPK and MAPK pathways to up-regulate the expression ofsir-2.1,sir-2.4, andskn-1. In oxidatively damaged zebrafish embryos, AG demonstrated a synergistic effect in augmenting the resistance of zebrafish embryos to oxidative stress by up-regulating the expression levels ofSIRT1andSIRT6within the zebrafish embryos system via the suppression of CD38 enzymatic activity and then inhibiting the expression ofIGFRthrough high levels ofSIRT6. These findings highlight the antioxidant and anti-aging properties of AG and indicate its potential application as a supplementary ingredient in aquaculture for enhancing fish health and growth.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Kaiqi Zhang,Shenglong Shang,Yu Zheng,Luyao Wei,Ping Zhu
The growing demand for efficient and economical cooling in both indoor and outdoor applications, especially personal cooling in outdoor environments, is a major challenge globally today. Passive daytime radiative cooling technology with spectral selectivity which operates by transferring radiative heat into cold universe (∼3 K) through the atmospheric window (8–13 μm) is an emerging and sustainable cooling technology. However, passive daytime radiative cooling materials are still limited by nondegradable, finite categories and single function. In this paper, multifunctional biobased poly(lactic acid) (PLA)/poly(butylene succinate) (PBS) nanofiber membranes with radiation cooling, electrical conductivity, and antibacterial properties were prepared by electrospinning technology combined with spraying technology. This multifunctional nanofiber membrane has high solar reflectivity (82%) and strong mid-infrared emissivity (98%) that achieves a temperature drop of 5.5–12 °C on sunny days and 2.9–10 °C on cloudy days. Adding 18.2% silver nanowires can reduce the resistance of the nanofiber membrane to 208 Ω, which also endowed the membrane with good antibacterial properties. This multifunctional nanofiber membrane opens up an environmentally sustainable approach for personal thermal management and introduces new possibilities for the rational design of next-generation smart textiles.
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·6919-6927
·
IF 6.1
Hongshan Wang,Xueting Pan,Shilie Pan,Junjie Li
Rare-earth (RE) compounds show wide applications in advanced photoelectric functional materials. Herein, by introducing [AgS3] trihedral and [NaQ6] (Q = S, Se) octahedral units into the AIREIIICIVQVI4 family for the first time, four new RE-based chalcogenides AIREIIISiQVI4 (AI = Ag, Na; REIII = La, Y; QVI = S, Se) were designed and successfully synthesized. With the increase of atomic radius from Ag, Li, Na, K, to Rb and Cs, the compounds show evident structural transitions from Ama2 (LiLaSiS4), P21/c (AgLaSiS4, NaLaSiS4), and P21 (KLaSiS4) to Pnma (RbLaSiS4, CsLaSiS4), highlighting that chemical modulations including atomic radius, coordination and bond length co-affected the structure transition. The title compounds exhibit wide band gaps (3.33 and 3.18 eV for AgLaSiS4 and AgYSiS4; 3.83 and 3.02 eV (HSE06) for NaLaSiS4 and NaLaSiSe4, respectively) that are higher than the Ag- and RE-based chalcogenides, as well as strong optical anisotropies (Δncal = 0.114–0.160@1064 nm). The theoretical calculations confirm the charge transfer enhanced band gap mechanism in the compounds and demonstrate that the layer distance influenced birefringence. The results enrich the chemical and structural diversity of RE compounds in the AIREIIICIVQVI4 family and give new insights into the design of new RE-based compounds with wide band gaps and large birefringence.
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Journal of Energy Chemistry
·
2024
·
IF 14
Haocheng Xiong,Donghuan Wu,Haonan Li,Andrew Li,Qikun Hu,Siyao Song,Bingjun Xu,Qi Lu
Renewable energy-driven bicarbonate conversion to valuable chemicals presents an attractive strategy for mitigating CO 2 emissions, as bicarbonate can be efficiently generated from the capture of atmospheric CO 2 using alkaline solutions with reactive absorption. In this work, we present a CO 2 -mediated bicarbonate conversion to pure formate using a cation exchange membrane-based electrolyzer with a 25 cm 2 electrode area. Our electrolysis achieved selectivities exceeding 75% for formate at a total current of 2.5 A, achieving formate concentrations up to 1.2 M and yields as high as 95% over extended periods. The techno-economic assessment confirmed the economic viability of the process, highlighting the potential for bicarbonate electrolysis as a sustainable method for producing valuable chemicals.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Limei Xu,Zining Wang,Hanyu Zhang,Aoxue Sun,Gaoxiang Zhou,Ruixue Jiang,Tiantian Chen,Yong Wang,Xiaochen Li
So far, potential chronic risks of silver nanoparticles (AgNPs) on organisms remain largely unknown, especially molecular-level alterations at the environmentally relevant concentrations. In this study, Chlamydomonas reinhardtii ( C. reinhardtii ) is used as the model organism to investigate chronic toxic effects of 100 μg/L and 50 mg/L AgNPs for 120 d. Physiological studies showed that AgNPs attached on cell surface and internalized into algal cells, inducing the increase in cell permeability, the decline in cell size and granularity, the damage in photosynthetic systems, and the production of reactive oxygen species (ROS). The damage in photosynthetic systems was reflected in the decline in the photosynthetic activity ( F v / F m ), photosynthetic efficiency ( F v / F 0 ), and fluorescence intensities of Peridinin-Chlorophyll Protein Complex and Allophycocyanin. C. reinhardtii attempted to increase the absorption (ABS/RC), dissipation (Dl 0 /RC) and trapping (TR 0 /RC) of light energy for adapting AgNPs stress. In addition, the accumulation of glutathione (GSH), ascorbate (ASC), and the irreversible cell apoptosis was observed in 50 mg/L AgNPs group. Transcriptomics showed that most of genes involved in photosynthetic systems (e.g. photo-oxidation, light harvesting, and chlorophyll synthesis) were down regulated, providing evidence for chloroplast as the main target of AgNPs toxicity. The up-regulation of some genes, involved in ASC and aldarate metabolism, and GSH metabolism, showed self-adaptive capacity of C. reinhardtii to eliminate ROS under long-term exposure to AgNPs. Phagocytosis and endocytosis were the main pathways of the internalization of AgNPs. This study provided valuable data for potential chronic risks of nanoparticles in aquatic environment.
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Catalysis Science & Technology
·
2016
·Vol. 6
·期 19
·7163-7171
·
IF 5.287
Lizhi Yuan,Luhua Jiang,Tianran Zhang,Guoxiong Wang,Suli Wang,Xinhe Bao,Gongquan Sun
Three-dimensional nanoporous metals of highly porous structure and interconnected ligaments are attractive for electrochemical reactions. Herein, freestanding 3D nanoporous silver (np-Ag) is prepared by a facile electrochemical approach, i.e., first electro-oxidizing silver to silver halides followed by electro-reduction of the silver halides by controlling the potential applied to the electrode. The np-Ag displays 130 and 11.5 times enhancement in catalytic activity for the oxygen reduction reaction and the formaldehyde electro-oxidation reaction, respectively, relative to the flat polycrystalline silver, and even outperforms the commercial nano-Pt catalyst. Detailed experimental and theoretical studies discover that both the facilitated mass transportation in the 3D interconnected porous structures and the favored kinetics contribute to the superior electro-catalytic activity of np-Ag.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Zhenzhi Cheng,Chenglong Lei,Haifu Huang,Shaolong Tang,Youwei Du
Here, we present a liquid–solid method (termed “LS method”) for the formation of spherical metal powders. By taking advantage of the low wettability of metal liquids on a solid powder, spherical metal droplets were formed under the influence of interfacial and surface tension, as demonstrated for copper, silver , aluminum , copper–tin alloy, copper–zinc alloy, and amorphous magnetic iron–silicon–boron materials. This LS method is a versatile and universal route and would be applied in powder metallurgy , 3D printing and metal injection modeling. We believe this method provide an additional way for the formation of spherical metal powders.
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MATERIALS & DESIGN
·
2016
·
IF 3.997
Xinjian Cheng,Yun Yu,Yiru Jia,Lian Duan
Three small molecular boron dipyrromethene (BODIPY) derivatives (B3a, B3b and B3c) were well-designed and synthesized at first, and then were incorporated into polyurethane to obtain macromolecular fluorescent sensors. These small molecular BODIPY derivatives exhibited high sensitivity and selectivity to Hg 2 + , Cr 3 + and Fe 3 + ions. The colors of these chemicals changed rapidly upon the addition of Hg 2 + , Cr 3 + and Fe 3 + ions. In addition, their fluorescence peaks shifted and was enhanced as well. B3a, B3b and B3c still remained the sensing properties when being introduced to polyurethane (PU). The functionalized PU films not only showed color change and fluorescence shift for detecting Hg 2 + , Cr 3 + and Fe 3 + ions as their small molecular counterparts, but also triggered a new emission peak in 500–600 nm. Besides, the functionalized PU film (PU-B3a as a sample) could absorb Hg 2 + ions more than 84 mg/g in unit time and volume. It suggested that as long as the structure of the small molecular sensor was remained, the fluorescent ability remained even it is introduced to the macromolecular chains. In addition, Glass transition temperature (T g ) of the PU films changed when B3a, B3b and B3c were introduced.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2016
·Vol. 24
·期 2
·1757-1768
·
IF 2.76
Zhao Yanxia,Sun Yangyang,Tian Chang,Gao Baoyu,Wang Yan,Shon Hokyong,Yang Yanzhao
Titanium-based coagulation is expected to achieve both efficient water purification and sludge recycling. This study is the first attempt to use titanium tetrachloride (TiCl 4 ) for silver nanoparticle (AgNP)-humic acid composite contaminant removal in a coagulation-ultrafiltration (C-UF) process, where characterization of flocs and membrane fouling under varied coagulant dose, initial solution pH, and AgNP concentration conditions are the main contents. Results suggested that the TiCl 4 achieved high AgNP removal in the form of silver nanoparticle through adsorption and sweep flocculation and simultaneously exerted additional 68.2 % higher dissolved organic carbon removal than Al 2 (SO 4 ) 3 . The TiCl 4 produced larger and stronger flocs but with weaker recoverability and less compact degree than did Al 2 (SO 4 ) 3 . Floc properties were independent of AgNP concentration except floc fractal dimension, which was negatively correlated with AgNP concentration. The TiCl 4 precoagulation caused less membrane fouling within wider pH range than Al 2 (SO 4 ) 3 did in the C-UF process. Incorporation of AgNPs during the TiCl 4 pretreatment process facilitated the mitigation of membrane fouling, which was, however, negligibly influenced by AgNP concentration in the case of Al 2 (SO 4 ) 3 .
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yafang Qi,Qingwen Tian,Yuena Meng,Dongxing Kou,Zhengji Zhou,Wenhui Zhou,Sixin Wu
The partial substitution of Cu+ with Ag+ into the host lattice of Cu2ZnSn(S,Se)4 thin films can reduce the open-circuit voltage deficit (Voc,deficit) of Cu2ZnSn(S,Se)4 (CZTSSe) solar cells. In this paper, elemental Cu, Ag, Zn, Sn, S, and Se powders were dissolved in solvent mixture of 1,2-ethanedithiol (edtH2) and 1,2-ethylenediamine (en) and used for the formation of (Cu1–xAgx)2ZnSn(S,Se)4 (CAZTSSe) thin films with different Ag/(Ag + Cu) ratios. The key feature of this approach is that the impurity atoms can be absolutely excluded. Further results indicate that the variations of grain size, band gap, and depletion width of the CAZTSSe layer are generally determined by Ag substitution content. Benefiting from the Voc enhancement (∼50 mV), the power conversion efficiency is successfully increased from 7.39% (x = 0) to 10.36% (x = 3%), which is the highest efficiency of Ag substituted devices so far.
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Energy & Environmental Science
·
2016
·Vol. 9
·期 12
·3736-3745
·
IF 25.427
Haihua Wu,Haobo Li,Xinfei Zhao,Qingfei Liu,Jing Wang,Jianping Xiao,Songhai Xie,Rui Si,Fan Yang,Shu Miao,Xiaoguang Guo,Guoxiong Wang,Xinhe Bao
A coordinatively unsaturated copper–nitrogen architecture in copper metalloenzymes is essential for its capability to catalyze the oxygen reduction reaction (ORR). However, the stabilization of analogous active sites in realistic catalysts remains a key challenge. Herein, we report a facile route to synthesize highly doped and exposed copper(I)–nitrogen (Cu(I)–N) active sites within graphene (Cu–N©C) by pyrolysis of coordinatively saturated copper phthalocyanine, which is inert for the ORR, together with dicyandiamide. Cu(I)–N is identified as the active site for catalyzing the ORR by combining physicochemical and electrochemical studies, as well as density function theory calculations. The graphene matrix could stabilize the high density of Cu(I)–N active sites with a copper loading higher than 8.5 wt%, while acting as the electron-conducting path. The ORR activity increases with the specific surface area of the Cu–N©C catalysts due to more exposed Cu(I)–N active sites. The optimum Cu–N©C catalyst demonstrates a high ORR activity and stability, as well as an excellent performance and stability in zinc–air batteries with ultralow catalyst loading.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 3
·362-367
·
IF 1.119
Cao Li,Jia Chunman,Zhang Qi,Chen Da,Zhang Chunyan,Qian Yaao
A fluorescent probe with a coumarin moiety bound to rhodamine 6G hydrazide( 1 ) was synthesized. Its sensing behavior toward various metal ions was investigated with fluorescence methods. Compound 1 displays different fluorescence emission responses to Al 3+ and Ca 2+ at the same excitation wavelength in the visible light region, while no changes occur after the addition of other metal ions. The binding ratios of the complexs of 1 -Al 3+ and 1 -Ca 2+ are both 2:1 according to the Job plot and high resolution mass spectrometer(HRMS) experiments. Moreover, emission spectrum of 1 -Ca 2+ complex and absorption spectrum of the rhodamine dyes overlap largely. When Al 3+ was added to the 1 -Ca 2+ system, calcium in complex 1 -Ca 2+ can be displaced by Al 3+ , resulting in the output of another ratiometric sensing signal, which demonstrates that the 1 -Ca 2+ complex can be served as a new and effective fluorescence resonance energy transfer(FRET) donor for rhodamine derivatives.
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