JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoshi Lang,Ruiyin Ren,Xinxi Wang,Lan Li,Kedi Cai
Lithium-sulfur batteries are considered as promising energy storage systems owing to rather high theoretical specific capacity (1675 mAh.g −1 ) and low cost. Nevertheless, the practical prospect is always limited owing to some short-comings, such as sulfur insulation, volume alternation and shuttle effect. To solve these problems, Cu 2+ regulated Fe 2 O 3 nanospheres (Fe 1−x Cu x O 1.5-δ ) as high-performance matrixes for sulfur composite cathodes of lithium-sulfur batteries are constructed via a facile hydrothermal method . It indicates that Cu 2+ regulation can increase the lattice size and exhibit uniform nanospheres micromorphology with less serious agglomeration. Moreover, as sulfur loading material can realize the joint effect on the physical and chemical confinement and some dissociate excess Cu 2+ with sulfur also can directly compose some Cu-S structures, further stabilizing the structure of sulfur composite cathode. In addition, Fe 0.6 Cu 0.4 O 1.5-δ /S composite cathode with sulfur loading mass ratio to 1:3 has fast electrochemical reaction kinetics with the low charge transfer resistance (25.54 Ω) and the high lithium-ion transfer efficiency (D Li+ =2.59 ×10 −12 cm 2 ·s −1 ) and the initial specific discharge capacities and ideal capacity retention accompanied by a charge and discharge voltage platform with small fluctuation.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Weiqing Xu,Farid Ahmed,Hai Xiong
A rhodamine hydrazide conjugating uridine moiety (RBH-U) is firstly synthesized by screening different synthetic routes, and then developed as a fluorescence probe for selective detection of Fe 3+ ions in an aqueous solution, accompanied by visual color change with naked eyes. Upon the addition of Fe 3+ in a 1:1 stoichiometry , a 9-fold enhancement in the fluorescence intensity of the RBH-U was observed with an emission wavelength of 580 nm. In the presence of other metal ions , the “turn-on” fluorescent probe with pH-independent (value 5.0 to 8.0) is remarkably specific for Fe 3+ with a detection limit as low as 0.34 μM. Further, the enhanced fluorescence intensity of RBH-U- Fe 3+ can be quenched as a switch-off sensor to assist in the recognition of Cu 2+ ions. Additionally, the colocalization assay demonstrated that RBH-U containing uridine residue can be used as a novel mitochondria-targeted fluorescent probe with rapid reaction time. Cytotoxicity and cell imaging of RBH-U probe in live NIH-3T3 cells suggest that it can be a potential candidate for clinical diagnosis and Fe 3+ tracking toll for the biological system due to its biocompatibility and nontoxicity in NIH-3T3 cells even up to 100 μM.
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高影响因子
Methods and Applications in Fluorescence
·
2022
·Vol. 10
·期 3
·035011
·
IF 3.849
Mengting Zhang,Yulu Zhang,Mingyu Gan,Liping Xie,Jing Wang,Weihua Jia,Wei Bian,Shaomin Shuang,Martin M F Choi
A fluorescent sulfur and oxygen co-doped graphitic carbon nitride quantum dots (S,O-CNQDs) were prepared from ethylenediaminetetraacetic acid disodium salt dihydrate and thiourea as the carbon and sulfur sources. The morphology and surface functional groups of S,O-CNQDs were characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The fluorescence of S,O-CNQDs could be quenched efficiently by Cu2+ under the optimum conditions. The S,O-CNQDs could function as an excellent fluorescent probe for Cu2+ detection with a wide linear range of 0.50–15 μM and a low detection limit of 0.58 nM. In addition, this fluorescent probe was employed for monitoring Cu2+ in samples of tap water, lake water, human serum and urine with good recoveries from 99.0% to 110.0%. Moreover, the S,O-CNQDs with high cell penetration and low cytotoxicity were utilized for Cu2+ detection in living cells. Owing to the excellent properties of S,O-CNQDs, the as-prepared S,O-CNQDs can be a potential candidate for biological applications.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Jie Zhang,Xibin Zhou,Jun Wang,Dawei Fang
In this work, a novel Eu 3+ -DTPA-bis(AMC) complex with red luminescence was designed and synthesized for sequential detection of Cu 2+ and biothiols (Cys/Hcy/GSH) based on the displacement strategy with the good selectivity, high sensitivity, and large Stokes shift (288 nm). The possible detection mechanism was verified by UV–vis, the high-resolution mass spectrometry, and the fluorescence decay curve. The experimental parameters, including the solution pH, the incubation time, the concentration ratio of Eu 3+ -DTPA-bis(AMC) to Cu 2+ and biothiols concentration, were optimized. Under the optimal conditions, it shows a good linear relationship between the concentration (0–10 μM) of Cu 2+ and the fluorescence intensity of Eu 3+ -DTPA-bis(AMC), with a low detection limit of 0.065 μM. The linear range and the limit of detection of the Eu 3+ -DTPA-bis(AMC)/Cu 2+ system for Cys/Hcy/GSH were 2.5–22.5/5–45/5–50 μM and 0.11/0.07/0.05 μM, respectively. Surprisingly, the high or low concentration of Eu 3+ -DTPA-bis(AMC)/Cu 2+ can significantly affect the selectivity of the sensing system to biothiols (Cys/GSH/Hcy). When the concentration of the Eu 3+ -DTPA-bis(AMC)/Cu 2+ system is 10.0 μΜ, it could recognize biothiols (Cys/GSH/Hcy) from other substances, but when the concentration is as low as 3.3 μM, it could further specifically distinguished Cys from Hcy/GSH. Owing to the high anti-interference characteristics, accuracy and specificity, the sensing system was well applied to the cascade detection of Cu 2+ in actual environmental samples and Cys in biological and food samples, including FBS, urine, milk, beverage, fresh juice with the satisfactory recoveries from 96.20 to 106.80 %.
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Materials Today Communications
·
2023
·
IF 3.8
Siyuan Zhang,Xinjian Cheng
Developing water-soluble fluorescent probes has important scientific and practical significance. In this work, coumarin derivatives bearing -OH were obtained through the classical Knoevenagel reaction firstly. Secondly, -C C- on allyl bromide was introduced into coumarin by Williamson ether formation method. Thirdly, hydrazine hydrate was added to the coumarin derivatives, a polymerizable small molecular coumarin fluorophore containing probe was obtained successfully. And, the -COOH on di-thioester underwent an esterification reaction with –OH groups on β-cyclodextrin(β-CD) to prepare oligomer based reversible addition-fragmentation chain transfer(RAFT) reagents. Finally, three copolymer probes β-CD-PMAA-Coumarin, β-CD-PMAm-Coumarin, and β-CD-PHEMA-Coumarin were prepared via RAFT polymerization , in which C C-coumarin was used as the functional monomer and methacrylamide(MAm)/methacrylic acid (MAA)/hydroxyethyl methacrylate (HEMA) as the main monomers. The MALDI-TOF mass tests showed that the macromolecular level probes were successfully prepared. These polymer probes have molecular weights up to 5.4 kDa and have narrow molecular weight distributions (PDI≤1.31). With the assistance of water-soluble long-chained PMAm/PMAA/PHEMA and hydrophilic β-CD, the coumarin containing macromolecular fluorescent probes could be dissolved in water readily. These water soluble polymer fluorescent probes could recognize Fe 3+ /Fe 2+ and Cu 2+ ions with high sensitivity. The detection limit of Fe 3+ could be as low as 0.34 μM. This study successfully developed a promising technique for producing highly selective, fully water-soluble fluorescent macromolecular probes.
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DYES AND PIGMENTS
·
2023
·
IF 4.5
Qiushuang Li,Bing Zhao,Xiangdong Kong,Liyan Wang,Wei Kan,Bo Song,Rui Yu,Pengfei Zhang
Designation and application of the luminescent COFs remains a tough challenge and imperative task because of their limited building block structure, the unavailable raw material, the tedious modification process, or the onefold sensing function. Herein, a fluorinated fluorescent covalent organic framework containing a phenanthro[9,10- d ]imidazole moiety [TFPB-PI(F)–COF] had been successfully designed for Cu 2+ and Al 3+ detection relayed by PO 4 3− . TFPB-PI(F)–COF serves as a highly sensing platform with the superior selectivity toward Cu 2+ and Al 3+ based on the coordination interaction and the chelation enhancement quenching (CHEQ) effect, and the detection limits are 2.3 and 4.2 n mol L −1 , respectively. Subsequently, accompanied with the gradual introduction of PO 4 3− , TFPB-PI(F)–COF@M (Cu 2+ and Al 3+ ) complex is wrecked due to electrostatic attraction with the detection limit of 10 n mol L −1 , led to the fluorescent recovery of TFPB-PI(F)–COF. Furthermore, the reversible fluorescent performance by the mode of “on–off–on” is perfect. Besides, the established relayed method can be successfully employed for the analysis of Cu 2+ and Al 3+ in environmental water samples with recoveries of 96.00–104.63 % and RSD <4.62 %. Moreover, the fluorescent images for the visual detection of Cu 2+ is also fabricated in living HeLa cells, which provides a modest contribution and an effective platform to the biological analysis.
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ACS Applied Bio Materials
·
2026
·
IF 5.6
Qi Cai,Yue Li,Xuewei Ba,Piaoping Yang
The aberrant vascularization and uneven vascular distribution stemming from rapid tumor cell proliferation culminate arouse intra-tumoral hypoxia, which substantially compromises the therapeutic response to conventional chemotherapy, as well as photothermal therapy (PTT) and photodynamic therapy (PDT). In this work, we present an innovative α-NaYbF4:Tm@Cu2-xSe@ZnFe2O4-DOX nanoplatform that synergistically integrates PTT, Fenton reaction-enhanced chemodynamic therapy, PDT, and doxorubicin (DOX)-based chemotherapy under 980 nm near-infrared (NIR) light activation and weakly acidic environment-initiation. The 10 nm cubic-phase α-NaYbF4:Tm up-conversion cores were initially synthesized. Subsequently, low atomic number (Z) Cu2-xSe nanocrystal grown as photo-thermal conversion agent demonstrated significantly stronger X-radiation (X-ray) attenuation capabilities and enhanced computed tomography (CT) imaging performance compared to clinically used iopromide. Furthermore, zinc ferrite (ZnFe2O4) shell was obtained in hydrothermal synthesis manner. The 980 nm NIR-excited α-NaYbF4:Tm nanoparticles undergo efficient energy down-conversion, emitting photons that perfectly match the absorption spectrum of ZnFe2O4, thereby maximizing reactive oxygen species (ROS) generation through bandgap-engineered photoconversion. The tumor's glycolytic activity creates a hydrogen peroxide (H2O2)-rich microenvironment, enabling ZnFe2O4-mediated Fenton-like reactions that produce hydroxyl radicals (•OH) radicals, ultimately triggering oxidative damage and apoptotic cell death. It is noted that dual-mode photothermal therapeutic efficacy was achieved by Cu2-xSe and ZnFe2O4 as photothermal nanocrystal with up-conversion luminescence (UCL), magnetic resonance imaging (MRI) and CT multimodal imaging. DOX as anticancer chemotherapeutics was conjugated to form α-NaYbF4:Tm@Cu2-xSe@ZnFe2O4-DOX nanoplatforms. It remains effectively release of large quantities of DOX at tumor part conferred response to excessive lactic and carbonic acids generated in cancer cells. Our research may provide an insight for generalizing enhanced synergetic performance by NIR light-mediated PTT, Fenton reaction, PDT and chemotherapy. It is not a simple assembly of known components, but rather a multi-functional synergistic system constructed through ingenious core-shell structural design, capable of responding to near-infrared light and the tumor microenvironment. For the first time, this system seamlessly integrates up-conversion luminescence-mediated PDT, dual photothermal agent-enhanced PTT, self-supplying H2O2 Fenton reactions, and acid/heat dual-responsive chemotherapy into a single nanoplatform. Additionally, it incorporates multimodal imaging capabilities, providing an innovative and comprehensive solution to overcome the clinical challenge of tumor hypoxia.
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Analytical Methods
·
2023
·Vol. 15
·期 40
·5329-5340
·
IF 3.1
Yixuan Yao,Fudong Zeng,Liangqiang Wu,Shuo Xing,Qingbiao Yang,Yaoxian Li
We have successfully synthesized a near-infrared fluorescent probe for the continuous detection of copper and sulfur ions. The probe has good selectivity and anti-interference ability against Cu2+ and S2−. The results show that after adding Cu2+ to the DL solution of the near-infrared fluorescent probe, Cu2+ forms a [DL + Cu2+] complex with the probe, which leads to fluorescence quenching due to the paramagnetism of Cu2+. The probe can be used for the quantitative detection of Cu2+ with a detection limit of 1.26 × 10−9 M. According to the Job's plot curve the binding stoichiometry between DL and Cu2+ is 1 : 1. Subsequently, S2− was added to the [DL + Cu2+] solution, because the precipitation dissolution equilibrium constant of CuS was Ksp = 1.27 × 10−36, so the binding capacity between Cu2+ and S2− was stronger, CuS precipitation was formed, and red fluorescence was re-released, and the quantitative detection of S2− was realized, and the detection limit was 3.50 × 10−8 M. Through bacterial imaging experiments, we found that the probe can accomplish the fluorescence imaging experiments of Staphylococcus aureus, indicating that the probe has good biopenetration and biocompatibility, and has application prospects in bioimaging and environmental monitoring. In addition, the probe DL has good suitability for Cu2+ and S2− detection in real samples.
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Analytical Methods
·
2019
·Vol. 11
·期 20
·2650-2657
·
IF 2.378
Yifang Gao,Huilin Zhang,Shaomin Shuang,Hui Han,Chuan Dong
Novel nitrogen co-doped carbon dots (NCDs) were synthesized as a fluorescent “on–off–on” switch for the highly sensitive and selective sensing of Cu2+ and glutathione (GSH) by a straightforward pyrolysis route. The as-prepared NCDs exhibited not only high optical stability but also superior biocompatibility and biolabeling potentials. The “on–off” process was realized by the introduction of Cu2+ on luminescent NCDs, which formed an NCDs–Cu2+ complex and quenched the fluorescence of NCDs efficiently. “Off–on” was also recovered upon addition of GSH owing to the competitive binding of GSH and Cu2+ leading Cu2+ to escape from the surface of the NCDs. The probe demonstrated high sensitivity and selectivity toward Cu2+ and GSH over other analytes, with a low detection limit of 3.62 × 10−4 μM and 6.32 × 10−4 μM, respectively. Concurrently, an “AND” logic gate was constructed based on the as-fabricated NCDs. Thanks to the highly intense emission of NCDs, the gradual quenching and restoration of their fluorescence with the addition of Cu2+ and further GSH could also be observed with the naked eye. More importantly, the probe was also extended to cellular imaging. The probe demonstrates high selectivity, repeatability, and stability, which offers a promising platform for environmental and biological sensing applications.
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Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Guangjian Zeng,Xinhua Liu,Meiying Liu,Qiang Huang,Dazhuang Xu,Qing Wan,Hongye Huang,Fengjie Deng,Xiaoyong Zhang,Yen Wei
The adsorption removal of heavy metal ions from aqueous solution using polymer nanocomposites has attracted great interest because of their advantages from both nanomaterials and polymers. In this work, a facile and novel method has been developed for surface modification of multiwalled carbon nanotubes (CNT) with carboxymethyl chitosan via combination of mussel inspired chemistry and Michael addition reaction. To obtain resultant CNT based chitosan nanocomposites (CNT-PDA-CS), pristine CNT were first coated with polydopamine (PDA) thin films through self polymerization of dopamine under alkaline aqueous solution. Then PDA modified CNT were further functionalized with carboxymethyl chitosan (CS) via Michael addition reaction. The successful preparation of CNT-PDA-CS nanocomposites was ascertained by a series of characterization techniques including transmission electron microscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis and X-ray photoelectron spectrometry. The utilization of the resultant CNT-PDA-CS for removal of Cu 2+ from aqueous solution was also examined in this work. The results showed that CNT-PDA-CS exhibited obviously enhanced Cu 2+ removal capability as compared with the unmodified CNT. Considered the versatility of mussel inspired chemistry, the method described in this work should be a general route for fabricating highly efficient adsorbents, which should be of great interest for environmental applications.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Wenqi Liu,Jingyan Zhang,Mei Dong,Zhaoyi Ding,Qunfei Wang,Fanghao Ning,Qin He,Yanyan Chen,Zhen Zhao,Zhongfu Li,Conghua Liu
Low-silica chabazite (CHA) catalysts with varying configurations of Cu 2+ -2Z and [Cu(OH)] + -Z active centers are developed through the regulation of the opening of CHA-cages. The catalysts are subsequently applied to the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR) reactions. A series of characterizations and performance evaluations indicate that the density of [Cu(OH)] + -Z in eight-member rings (8MRs) is positively correlated with low-temperature performance. Moreover, the presence of partial Cu 2+ -2Z in six-member rings (6MRs) enhances activity and tolerance at high temperatures. The residual K + ions in the CHA-cages after NH 4 + exchange are retained in the 6MRs. Density functional theory calculations demonstrate that the residual K + ions stabilize the 6MRs structure, ensuring the entry and stable presence of the active Cu 2+ -2Z centers. In situ analysis reveals the reaction intermediates involved in the NH 3 -SCR process on representative catalysts. These findings can further elucidate the active centers of CHA-type catalysts and guide the design of commercial catalysts.
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DYES AND PIGMENTS
·
2018
·
IF 3.767
Li–Li Chang,Qiang Gao,Shu Liu,Ce–Ce Hu,Wen–Jun Zhou,Ming–Ming Zheng
A new multiple-ion-responsive chemosensor was developed for the selective and differential detection of Hg 2+ and Cu 2+ , based on the completely different ions recognition behaviors of the single rhodamine hydrazone-type probe in the absence and presence of UV irradiation. The probe was synthesized through simple chemical linkages of rhodamine B hydrazide, 4-hydroxybenzaldehyde, and acryloyl group. In the absence of UV irradiation, this probe could selectively sense Hg 2+ in the presence of other metal ions by colorimetric and fluorescent responses with considerably high sensitivity (limit of detection: 7.1 × 10 −8 M), and the process could be monitored directly by the naked eye. Intriguingly, when adding various metal ions to the probe solution under UV irradiation, only the Cu 2+ ion, even at a concentration of 1.5 × 10 −7 M, was found to induce a significant photochromism along with distinct color change. Benefiting from the high selectivity and sensitivity of such a photochromism, a convenient colorimetric sensing method for detection of Cu 2+ in presence of UV irradiation was also established. Furthermore, we demonstrated that the interference of Hg 2+ on Cu 2+ could be easily eliminated by employing Br − as a masking agent, and subsequently the discrimination of Hg 2+ and Cu 2+ under their coexistence was achieved.
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