Environmental Science-Water Research & Technology
·
2024
·Vol. 10
·期 8
·1785-1794
·
IF 3.5
Jun Zhang,Shenjun Wang,Yuhao Wu,Jiahai Ma
In advanced oxidation systems, the promoting effect of bicarbonate is relatively overlooked. Bicarbonate, as an inorganic anion widely present in natural waters, is extremely important for water treatment. Therefore, bicarbonate was added to a PDS/Cu2+ system to investigate the degradation mechanisms of organic contaminants. The generation of alkyl radicals in the PDS/Cu2+/HCO3− system was first demonstrated through Electron Paramagnetic Resonance (EPR) testing. This study reveals that the introduced bicarbonate ions undergo transformation into alkyl radicals. The presence of alkyl radicals promotes the cycling of monovalent, divalent, and trivalent copper ions, facilitating the degradation of contaminants. The production of monovalent and trivalent copper ions in the reaction system was confirmed through UV-vis absorption spectroscopy and quenching experiments. Furthermore, the change in the oxidation state of copper ions was further confirmed through EPR testing. These findings not only shed new light on the degradation mechanism of the PDS/Cu2+ system in the presence of bicarbonate but also open up new avenues for the further application of bicarbonate in advanced oxidation processes.
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高影响因子
POLYMER
·
2024
·
IF 4.1
Changzeng Wang,Shuxin Li,Ye Yuan,Yundong Ji,Dongfeng Cao
Polysiloxanes are known to significantly enhance the toughness and thermal stability of epoxy resins . However, the study of phase transitions and their effects on the properties of modified resins, synthesized through copolymerization or blending, was quite limited. In this work, a phenyl propyl polysiloxane (PPPS) modified epoxy resin (P/E) was prepared using a solvent method to scrutinize the influence of varying PPPS concentrations and phase transitions on the macroscopic properties of the resin. The molecular structure of P/E composite was confirmed through Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance ( 1 H and 29 Si NMR) analysis. Based on atomic force microscopy (AFM) results, the progression of phase transitions was deduced: from a homogeneous phase to a co-continuous phase, and subsequently to a sea-island phase. This progression of phase transitions is attributed to the varying solubility of the copolymer with different PPPS content in the resin. At a PPPS content of 20 wt%, a significant improvement in tensile strength (σ) and critical strain energy release rate (GIc) was observed, increasing by 45 % and 400 %, respectively, upon the formation of a co-continuous phase. The presence of a silicone-rich spherical domain within sea-island phase can significantly improve the G Ic of the resins, while this also results in a rapid reduction in tensile strength (σ). Furthermore, the thermal stability of P/E composite is also affected by its phase structures. The silicone-rich spherical domains are more effective in forming a protective layer compared to the co-continuous phase, which leads to a decreased pyrolysis rate and an increased yield of residual char. This work elucidates the influence of PPPS content and phase structure on the macroscopic properties, highlighting the significant potential for developing composite materials with superior comprehensive performance.
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高影响因子
Science Bulletin
·
2025
·
IF 21.1
Wanguo Gao,Zhe Lu,Yecheng Leng,Chengyang Wu,Yingfang Yao,Xi Zhu,Junchuan Sun,Xiwen Yu,Cheng Wang,Congping Wu,Wenlei Wu,Bing Wang,Lu Wang,Zhigang Zou
Cu-based catalysts attract considerable attention because of their exceptional CO 2 photo-/electro-/thermo-reduction capacities, where Cu(I) is generally treated as the active species. However, a significant problem hindering the large-scale applications of Cu-based catalysts is the inactivation of Cu(I) via irreversible redox to Cu(II)/Cu(0). This study proposes a Cu(I) valence pinning method based on hydroxyapatite (HAP). Experimental and theoretical studies demonstrate that the phonon resonance among the Cu(I) ions, their adjacent heteroatoms, and the intermediates adsorbed at the Cu(I) sites yields Cu(I) valence electrons in their lowest energy states. Thus, Cu(I) is stabilized, stable, and efficient photothermal CO 2 hydrogenation is promoted. However, because of the change of Cu(I) coordination environment during the CO 2 hydrogenation reaction, Cu(I) ions migrate into the bulk phase, leading to activity attenuation. Nevertheless, Cu(I) ions can be pulled out to the surface of HAP under the oxidative humid air condition, and the catalytic activity can be easily recovered. Thus, we propose a simple cyclic reaction/regeneration process. This enables the Ca 5 (FeCuCe) 5 -HAP catalyst to achieve the CO yield of 402.8 mmol g −1 h −1 and a CO 2 conversion rate of 27.7%, which is close to the thermodynamic equilibrium. This catalyst also displays a selectivity of approximately 100% and cycle stability of 156 h at 500 °C under a pressure of 1 atmospheric. Our study provides a viable method for the scale applications of Cu(I) based catalysts in the “negative carbon” industries.
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DOI
PubMed
高影响因子
TALANTA
·
2019
·
IF 4.916
Xuan Wang,Caicheng Long,Xiaoyan Xu,Taiping Qing,Peng Zhang,Bo Feng
Micrococcal nuclease (MNase) is a nonspecific endo-exonuclease that digests single-stranded/double-stranded DNA and RNA. The existence of MNase can serves as an important diagnostic biomarker of Staphylococcus aureus ( S. aureus ) infection. However, most of the substrates in MNase-based sensors are single-stranded DNA, which could also be digested by exonuclease I or S1 nuclease and interfere the MNase detection. In this work, we developed a highly selective fluorescent method for MNase detection using a specific dsDNA and nucleic acid dye SYBR Green I (SGI) as the indicator. After rational design, an AT-rich dsDNA with 3′ protruding termini was screened as the high-specific substrate of MNase assay and efficient enhancer of SGI. The AT-rich dsDNA substrate can resist the digestion of other exonuclease and greatly enhance the fluorescence of SGI. This high-specific substrate-based probe can detect MNase in buffer as well as biological sample with highly selectivity . Moreover, this method was also applied to monitor the MNase secreted by S. aureus . Thus, the proposed MNase-based assay has a strong potential to identify S. aureus in food safety and microbial infection due to its excellent analytical sensitivity and high selectivity.
研究领域:
微生物学
·
分子生物学
·
医学诊断
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PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3121
·
IF 5.719
Zhangwei He,Runnan Yu,Wanrong Song,Yongshuai Gong,Hui Li,Zhan’ao Tan
Bismuth triiodide (BiI3) is a particularly promising absorber material for inorganic thin-film solar cells due to its merits of nontoxicity and low cost. However, one key factor that limits the efficiency of BiI3solar cells is the film morphology, which is strongly correlated with the trap states of the BiI3film. Herein, we report a coordination engineering strategy by using Lewis base dimethyl sulfoxide (DMSO) to induce the formation of a stable BiI3(DMSO)2complex for controlling the morphology of BiI3films. Density functional theory calculations further provide a theoretical framework for understanding the interaction of the BiI3(DMSO)2complex with BiI3. The obtained BiI3(DMSO)2complex could assist the fabrication of highly uniform and pinhole-free films with preferred crystallographic orientation. This high-quality film enables reduced trap densities, a suppressed charge recombination, and improved carrier mobility. In addition, the use of copper(I) thiocyanate (CuSCN) as a hole transport layer improves the charge transport, enabling the realization of solar cells with a record power conversion efficiency of 1.80% and a champion fill factor of 51.5%. Our work deepens the insights into controlling the morphology of BiI3thin films through the coordination engineering strategy and paves the way toward further improving the photovoltaic performances of BiI3solar cells.
研究领域:
材料科学
·
光伏技术
·
理论计算
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Bin Jiang,Haozhen Dou,Luhong Zhang,Baoyu Wang,Yongli Sun,Huawei Yang,Zhaohe Huang,Hanrong Bi
Deep eutectic solvents (DESs), as a new generation of designer solvents , were firstly employed to fabricate the supported liquid membranes (SLMs) for the olefin/paraffin separation via facilitated transport. The novel CuCl/DESs-SLMs were prepared by impregnating the mixture of choline chloride-glycerol based DESs and copper (I) chloride (CuCl) into the microporous nylon membranes. The results of FTIR, 1 HNMR and mass spectrometry (MS) confirmed the existence of various Cu (I)-containing anionic species and hydrogen-bond networks in the membrane liquid of CuCl/DESs. The CuCl/DESs-SLMs were characterized by scanning electron microscope (SEM), contact angle measurement and weight analysis, and their performances of CuCl/DESs-SLMs were evaluated by the C 2 H 4 /C 2 H 6 separation experiments. The effects of DESs composition, CuCl concentration , operation pressure and temperature were investigated systemically. It was found that the activity and chemical stability of Cu (I)-containing anionic species were enhanced through the hydrogen-bond interactions between the anionic species and DESs, which significantly increased the permeability of C 2 H 4 and selectivity of C 2 H 4 /C 2 H 6 . Compared with other studies, the CuCl/DESs-SLMs exhibited comparable permeability and higher selectivity up to 20 for C 2 H 4 /C 2 H 6 . In conclusion, the CuCl/DESs-SLMs provided a promising method for the C 2 H 4 /C 2 H 6 separation.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 5
·1103
·
IF 4.6
Bin Zhang,Xiaoyu Wei,Peiwen Du,Huangqun Luo,Lanfang Hu,Liping Guan,Guangying Chen
Polysaccharides are very promising molecules in the field of pharmacotherapy. Knowing this, the aim of this study was to extract, characterize, and evaluate the action of the polysaccharides in noni juice, using biological models of Type 2 diabetes mellitus processes. In this study, one polysaccharide named NJSPd−1 was separated from fermented noni fruit juice. The characterization assay showed that NJSPd−1 had a molecular weight ( Mw ) of 18,545 Da. NJSPd−1 consisted of galacturonic acid, galactose, rhamnose, and arabinose, with a molar ratio of 28.79:20.34:19.80:18.84 according to HPGPC analysis, and the glycosidic bond mainly included →4)- α -D-GalA p -(1→, 4)- β -D-Glc p -(1→, →2)- α -L-Rha p -(1→, and →3)- α -L-Ara f -(1→. The prevention of oxidative stress activities by NJSPd−1 was evaluated using high-glucose-induced oxidative stress in HepG2 cells. In vitro results showed that NJSPd−1 influenced the downregulation of the proteins and genes Nrf2, Keap1, HO-1, and NQO1 in HepG2 cells. These results suggest that NJSPd−1 exerted a protective effect against oxidative stress in HepG2 cells by activating the Nrf2/HO-1/NQO1 signaling pathway.
研究领域:
药理学
·
生物化学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jiajia Wang,Li Li,Ruyi Wei,Renfeng Dong
Here, we report the first PbS quantum dot (QD)-based micromotors with NIR-I light-driven photocatalytic propulsion and NIR-II fluorescence. Under the irradiation of NIR-I light (808 nm), PbS QD-doped cuprous oxide (Cu2O@PbS) micromotors can display efficient propulsion in a variety of biocompatible fuels such as malic acid, glucose, and urea. Among them, the Cu2O@PbS micromotors exhibit the best propulsion performance in a very low concentration of malic acid, with an average speed as high as 11.86 μm/s. The enhanced NIR-I photocatalytic activity of Cu2O@PbS micromotors benefits from the doping of NIR-I PbS QDs that can be excited by NIR-I light and exhibit high electron transport efficiency. The doped PbS QDs can effectively increase the absorption efficiency of the micromotors in the NIR-I region while also inhibiting the recombination of photogenerated electron–hole pairs. Interestingly, due to the presence of NIR PbS QDs, the Cu2O@PbS micromotors demonstrate prominent and stable NIR-II fluorescence (emission wavelength: 1100 nm), which offer promising potential for visualization of their position in vivo. In comparison to other photocatalytic micromotors, the simple fabrication strategy, excellent NIR-II fluorescence, together with the NIR-I light-dependent propulsion behavior of the current Cu2O@PbS micromotors, thus pave the way for further development of advanced smart “robots” for intelligent biomedical applications.
研究领域:
纳米技术
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生物医学工程
·
材料科学
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DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 20
·2200865
·
IF 10.05
Kai Han,Jiance Jin,Binbin Su,Jianwei Qiao,Zhiguo Xia
Metal clusters with color-tunable radioluminescence have attracted growing attention as X-ray detection materials. However, they are generally less scintillation-efficient due to the coexistence of multiple exciton recombination centers. Herein, two new zero-dimensional copper(I)-based clusters (DIET) 3 Cu 3 X 3 (DIET = 1,3-Diethyl-2-thiourea, X = Cl, Br) are designed, which support the single channel photon emission (Cu cluster centered, CC) to enhance the scintillation performance. Those DIET ligands (L) anchoring with copper(I) ions not only generate direct Cu L bonds, but also form a disorder [Cu 3 X 3 ] cluster, which results in the intense X-ray absorption. (DIET) 3 Cu 3 Br 3 with low halogen electronegativity further weakens halogen-to-ligand charge transfer (XLCT) emission, enabling enhanced quantum efficiency (≈69%) and scintillation performance comparable to commercially available Lu 3 Al 5 O 12 :Ce. Moreover, the flexible thin film counterpart demonstrates legible X-ray imaging with high spatial resolution of 11.71 lp mm −1 . This study provides a feasible design principle to discover new metal cluster-based scintillators and to further expand their radiation detection applications.
研究领域:
材料科学
·
辐射探测
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高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Jun Li,Yao-Yao Fan,Jie Wen,Jing Zhang,Zhi-Qi Zhang
The HIV-Ι trans-activation responsive (TAR) RNA–trans-activator of transcription (Tat) protein complex is crucial for the efficient transcription of the integrated human immunodeficiency virus-I genome and is an established therapeutic target for AIDS diagnosis and treatment. Developing a sensitive strategy for the TAR RNA-binding ligand assay could provide antiviral leads with a radically new mechanism for the treatment of AIDS. Herein, a new TAR RNA-binding ligand assay platform was established using a signal amplification strategy that combines aggregation-induced emission (AIE) with a metal-enhanced fluorescence (MEF) concept. The tetraphenylethylene (TPE) derivative was labeled on the Tat peptide as a fluorescent molecule, while the TAR RNA was immobilized on the surface of the Fe3O4@Au@Ag@SiO2 nanoparticles (NPs) to specifically bind the TPE-Tat peptide. The TPE-Tat peptide was weakly emissive itself while emitting strongly in the NP–TAR–TPE-Tat complex by the AIE and MEF signal amplification effect. It was confirmed by known Tat peptide competitors that this system could be applied to the screening and detection of TAR RNA-binding ligands because they could replace the TPE-Tat peptide from the complex and make the system fluorescence decrease. When this system was adopted to test four candidate ligands, it was found that bisantrene had a favorable TAR RNA-binding ability. The proposed AIE–MEF strategy not only provides a sensitive and reliable method for the TAR RNA-binding ligand assay but also can avoid the influence of ligands on fluorescent detection in the conventional displacement assay.
研究领域:
病毒学
·
分子生物学
·
生物医学工程
·
化学生物学
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 11
·期 1
·156-163
·
IF 7
Jiajing Wu,Jing-Li Qi,Yue Guo,Shufang Yan,Wenlong Liu,Sheng-Ping Guo
Hybrid copper halides have been rapidly developed because of their high photoluminescence quantum yield (PLQY), good water resistance, and variable structures; nevertheless, the controlled synthesis and interconversion of multiple hybrid copper halides containing different coordination geometries are rarely reported. In this study, using ethyltriphenylphosphonium as the templating cation [EtPh3P]+, three stable hybrid copper bromides with diverse inorganic anion skeletons, (EtPh3P)CuBr2 (112), (EtPh3P)2Cu2Br4 (224), and (EtPh3P)2Cu4Br6 (246), were synthesized by carefully tuning the feeding ratio of CuBr and (EtPh3P)Br. The emission peaks were located at 536, 546, and 580 nm with optical absorption edges of 3.64, 2.91, and 2.82 eV, respectively, showing a gradual redshift as the inorganic units change from a monomer (112) to dimer (224) and then to a tetramer (246). More interestingly, multiple solvents, including methanol (MeOH), ethanol (EtOH), isopropanol (IPA), acetic acid, ethylene glycol, and water with heat, can induce the spontaneous conversion of 112 and 224 to 246, which is attributed to the affinity of the organic salt with the solvent. Additionally, the crystal structure can transform from 246 into 112 (224) or can undergo a reversible dynamic conversion between 112 and 224 using the crystallization method. This work not only provides a strategy to adjust the inorganic units of the crystals but also to achieve multi-state structural transitions, making them viable candidates for next-generation multifunctional optoelectronic devices.
研究领域:
材料科学
·
化学
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DOI
高影响因子
Food Science and Technology
·
2021
·
IF 1.718
LI Tian-Xiao,LUO Cheng,GENG Zong-Ze,JIANG Zhong-Rong,JI Ling-Bo,SHENTU Hong-Qian,XIE Yun-Fei,HU Jun,LIU Yuan-Fa,LI Dong-Liang
To study the caramel reactions of disaccharides with water, the type I maltose caramel products (MCPs) and sucrose caramel products (SCPs) at three reaction stages were yielded and their reaction rates, UV absorptions, flavor compounds, and antioxidant activities were also detected. It was found that the caramel reactions of sucrose were faster than those of maltose and their reaction rates quickly increased to a high level in the middle stage. UV absorption of SCP in the late stage at 305 nm was much stronger than those of MCPs. Both the MCP and SCP obtained at 180 °C and 4 min had the highest concentrations of 5-hydroxymethylfurfural and total flavor compounds. Moreover, the total flavor concentrations of SCPs were much larger than those of MCPs and the antioxidant effects of SCPs were also stronger. Thus, a preferred condition for both two disaccharide caramel reactions was suggested at 180 °C for 4 min and the sucrose caramels could give better flavors than maltose caramels.
研究领域:
食品科学
·
化学
·
营养学
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高影响因子
危险品化学品经营许可证（带存储）