DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Chunmei Lai,Simin Lin,Lei Xiong,Yuxin Wu,Chao Liu,Yanqiao Jin
A nitrogen-doped carbon quantum dots ( N-CQDs )-based “on-off” fluorescent nanosensor was profitably synthesized through one-pot hydrothermal treatment of citric acid and o -phenylenediamine for the determination of Fe 3+ and imaging towards cancerous cells in vitro. The synthesized N-CQDs exhibited excellent photoluminescence and favorable biocompatibility. The excitation-dependent fluorescence emission spectra were observed and the maximum emission wavelength was 483 nm at the excitation wavelength of 420 nm. The fluorescent N-CQDs had a selective and sensitive response to Fe 3+ with a limit of detection of 0.177 μM and an allowable detection range of 0–110 μM. The sensor was applied for the determination of Fe 3+ ions in tap water with satisfactory results. Moreover, the N-CQDs provide a practical and promising method for cellular imaging due to their excellent fluorescence potency and negligible cytotoxicity.
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INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 23
·12518
·
IF 4.9
Mingyu Jia,Jueyu Wang,Yuxuan Liu,Daizong Cui,Min Zhao
In this study, Fe3(PO4)2·8H2O magnetic nanoparticles (MNPs) were successfully extracted from the strainBurkholderia cepaciaCG-1. We subsequently characterized their composition, structure, and morphology, revealing that these nanoparticles consisted of Fe3(PO4)2·8H2O with an average diameter of 66.87 ± 0.56 nm. Our measurements indicated magnetic parameters of 151 Oe for coercivity, 2 emu/g for saturation remanence, and 16 emu/g for saturation magnetization. Our findings confirmed that these magnetic nanoparticles exhibited intrinsic peroxidase-like activity, catalyzing the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) in the presence of H2O2. Compared to horseradish peroxidase (HRP), the peroxidase mimic demonstrated greater stability under various physicochemical conditions. To investigate the mechanisms underlying the peroxidase-like catalysis of Fe3(PO4)2·8H2O, we employed fluorescence spectroscopy and electron spin resonance (ESR) analysis. The results revealed that the peroxidase-like activity of Fe3(PO4)2·8H2O stemmed from the generation of hydroxyl radicals (·OH). Furthermore, we established a platform for the colorimetric detection of H2O2and glucose. Our method was capable of detecting H2O2concentrations as low as 1.0 × 10−3mmol/L. Impressively, this sensitive method was successfully applied to determine glucose levels in human serum.
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CARBOHYDRATE POLYMERS
·
2025
·
IF 12.5
Fan Wang,Yuqing Wang,Lili Zhang,Ting Zheng,Jun Shen
Two novel cellulose phenylcarbamate derivatives bearing 3,5-dimethylphenylcarbamate substituents at 2,3-positions and 4-(4-(3-(2-benzo[ d ]thiazolyl)ureayl)benzyl)) ( Cel-1 ) or 4-(4-(3–4-(2-benzo[ d ]thiazolyl)phenyl)ureayl)benzyl)) ( Cel-2 ) at 6-position of glucose units were prepared. Their metal ion discrimination properties were then carefully scrutinized using 12 metal ions. Combined the 2,3-dimethylphenylcarbamates with a more bulky benzothiazolyl phenylcarbamate at 6-position, the derivative Cel-2 exhibited excellent recognition ability for both Cu 2+ and Fe 3+ , and achieved high selective detection at extremely low concentrations through fluorescence and UV–visible modes. The limit of detection of Cel-2 for the two metal ions in both modes were 2.0 μM (Cu 2+ ) and 1.0 μM (Fe 3+ ) (in fluorescence mode), 1.3 μM (Cu 2+ ) and 0.7 μM (Fe 3+ ) (in UV–visible mode), respectively, which were much lower than the maximum pollution level for copper ions (20 μM) and iron ions (5.4 μM) in the potable water. In addition, good anti-interference ability of Cel-2 was also observed for specific detection of Cu 2+ /Fe 3+ in the combined system containing other metal ions. It revealed that the obtained regioselectively substituted phenylcarbamate of cellulose possessed powerful performance for efficient detection of Cu 2+ /Fe 3+ in various circumstance via fluorescence and UV–visible modes. Furthermore, Cel-2 was also been prepared into smart ink, presenting its possible potential in the anti-counterfeiting application.
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Materials Today
·
2025
·
IF 22
Haiping Luo,Shenglan Zhou,Wenjie Deng,Jiahao Liu,Jiaqing Peng,Bo Li,Zhihua Xiong,Wei Wang,Xinyu Ye
Fe 3+ is a promising near-infrared (NIR) activator ion due to its tunable emission and non-toxicity, which has attracted growing interest. However, developing high-performance broadband NIR-emitting phosphors based on Fe 3+ remains a significant challenge. In this work, we present Fe 3+ -activated A 2 LuSbO 6 (A = Ba/Sr/Ca) double perovskite phosphors, which exhibit unusually long-wavelength NIR emission (>850 nm). By adopting a cation substitution strategy at the A-site, we designed the gradual replacement of large-radius ions with small-radius ions, achieving controllable tuning of emission from 847 nm to 937 nm. This substitution process simultaneously reduces structural symmetry and induces octahedral distortion, which breaks the spin-forbidden transition of Fe 3+ and enhances luminescence performance. However, the continuous emission redshift leads to a large Stokes shift, which suppresses Fe 3+ luminescence. The combined effect of these two factors results in optimal luminescence efficiency in Sr 2 LuSbO 6 :1.0 %Fe 3+ (SLSO) sample, with internal/external quantum efficiencies (IQE/EQE) of 94.8 %/54.5 %. To further enhance luminescence performance, we introduced the rare-earth Yb 3+ , establishing an efficient Fe 3+ →Yb 3+ energy transfer (ET) channel that reduces non-radiative transition losses. Compared with the Yb 3+ -free sample, the SLSO:1.0 %Fe 3+ , 3.0 %Yb 3+ sample exhibits a broadened FWHM from 115 nm to 180 nm, enhanced IQE and EQE of 98.1 % and 56.4 %, respectively, and 13 % improved thermal stability. Finally, a pc-LED device based on the SLSO:1.0 %Fe 3+ , 3.0 %Yb 3+ phosphor demonstrates potential for applications in NIR spectroscopy analysis, night vision, biomedical imaging, and other fields. This work lays a foundation for further research on strategies to regulation the optical properties of Fe 3+ -activated NIR phosphors.
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Laser & Photonics Reviews
·
2025
·
IF 10
Chunxuan Chen,Xiaozhou Zheng,Wanyuan Li,Wubin Dai
NIR phosphors based on commercial LED pumping are gained great concerns. However, blue excitation and lack of broadband NIR phosphors are still obstacles. Herein, NIR-II emitting ZnGa 2 O 4 : Fe 3+ , Ni 2+ with autologous defects are designed. Self-PL is associated with intrinsic defects including [GaO 6 ], antisite defects ( G a Z n · $Ga_{Zn}^ \cdot $ ) and oxygen defects ( O i ). Based on efficient energy transfer, ZGO: Fe 3+ , Ni 2+ exhibits broadband NIR-II emission. To improve PL efficiency of Fe 3+ , an oxygen defects repairing engineering via anionic F − -substitution artifice is executed, resulting in high PL quantum efficiency of ≈64.6% and splendid thermal stability (≈75.5%@423K) for ZGOF: Fe 3+ , Ni 2+ . The reduction in local site symmetry after F-substitution splits energy states of Fe 3+ in purely octahedral crystal field also helps to relief the Laporte selection rule and widens excitation/PL spectra with high efficiency. A NIR-II phosphor-converted LED (pc-LED) by combination of ZGOF: Fe 3+ , Ni 2+ and a n UV LED chip via remote ʻcappingʼ packaging strategy with high radiant power is fabricated and its versatile applications in night vision, non-destructive detection, food analysis and optical pressure sensing are demonstrated. This study paves a feasible way to realize high-quality NIR phosphor and its corresponding device for wide applications.
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JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Zengchen Liu,Zimin Wang,Wenbo Zhang,Kaibo Xu,Wenping Zhu,Hongyu Chen,Yahong Chen,Yanxia Li,Baodui Wang
Iron is one very important element, which plays key roles in living organisms. Especially, ferric iron ions participate in various biochemical processes of the body through functions such as heme synthesis, immune regulation, iron utilization and transport, redox reactions, and gene expression regulation. Herein, a highly selective fluorescence sensor for ferric ion based on boric acid assisted N-doped CDs was prepared. In the sensing process of Fe 3+ , the fluorescence of BA-N-CDs water solution changes from yellow to red obviously in acidic condition, accompanied by the change in color of the solution from pale yellow to dark red. In addition, the fluorescence sensor shows low detecting limit (nanomolar level) by fluorescence titration spectrum. Moreover, according to evaluate excellent fluorescence imaging of sensor toward Fe 3+ in M109 cell and tomato leaf, the study provided an important idea for constructing water-soluble fluorescence sensor for Fe 3+ in organism and plant system.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Geying Liu,Chaoyue Xie,Yan Zhang,Ye Du,Jie Wang,Jia Lin,Jing Bai,Jinhua Li,Changhui Zhou,Tingsheng Zhou,Baoxue Zhou
Urea electrolysis is an appealing topic for hydrogen production due to its ability to extract hydrogen at a lower potential. However, it is plagued by sluggish kinetics and noble-metal catalyst requirements. Herein, we developed nickel-iron-layered double hydroxide (NiFe-LDH) nanolayers with abundant oxygen vacancies (O V ) via synergistically etching nickel foam with Fe 3+ and Cl - ions, enabling the efficient conversion of urea into H 2 and N 2 . The synthesized O V -NiFe-LDH exhibits a lower potential (1.30 vs. reversible hydrogen electrode, RHE) for achieving 10 mA cm −2 in the urea oxidation reaction (UOR), surpassing most recently reported Ni-based electrodes. O V provides favorable conductivity and a large surface area , which results in a 4.1-fold in electron transport and a 5.1-fold increase in catalyst reactive sites. Density Functional Theory (DFT) calculations indicate that O V can lower the adsorption energy of urea, and enhance the bonding strength of *CONHNH, giving rise to improved UOR. This study provides a viable path toward economical and efficient production of high-purity hydrogen.
研究领域:
材料科学
·
能源化学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Zhichao Li,Yuzhen Zhang,Gaoshuang Zuo,Peihua Zhao,Chao Wang,Yanzhong Wang
Layered double hydroxides (LDHs) have garnered broader attention as electrocatalytic materials due to their low cost, structural tunability, and high specific surface area. However, the intrinsic low activity and poor electrical conductivity of LDHs pose challenges that hinder their further application in the field of electrocatalysis. Herein, we synthesized nickel‑iron layered double hydroxide @polypyrrole (NiFe-LDH@PPy) composite electrocatalyst through a one-step method with Fe 3+ ions eroding Ni foam to form NiFe-LDH and simultaneously as catalyst to synthesis PPy at room temperature. The NiFe-LDH@PPy composite achieves low overpotentials of 236 mV for the oxygen evolution reaction (OER) and 95 mV for the hydrogen evolution reaction (HER) at a current density of 10 mA cm −2 . Notably, the constructed water electrolysis cell with NiFe-LDH@PPy as cathode and anode only requires a water electrolysis voltage of 1.57 V at 10 mA cm −2 . The excellent water-splitting performance is attributed to the high electronegativity of nitrogen in PPy and its superior conductivity.
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Nanomaterials
·
2019
·Vol. 9
·期 5
·738
·
IF 4.034
Yue Yang,Tong Zou,Zhezhe Wang,Xinxin Xing,Sijia Peng,Rongjun Zhao,Xu Zhang,Yude Wang
The fluorescence intensity of N, S co-doped graphene quantum dots (N, S-GQDs) can be quenched by Fe3+and Hg2+. Density functional theory (DFT) simulation and experimental studies indicate that the fluorescence quenching mechanisms for Fe3+and Hg2+detection are mainly attributed to the inner filter effect (IFE) and dynamic quenching process, respectively. The electronegativity difference between C and doped atoms (N, S) in favor to introduce negative charge sites on the surface of N, S-GQDs leads to charge redistribution. Those negative charge sites facilitate the adsorption of cations on the N, S-GQDs’ surface. Atomic population analysis results show that some charge transfer from Fe3+and Hg2+to N, S-GQDs, which relate to the fluorescent quenching of N, S-GQDs. In addition, negative adsorption energy indicates the adsorption of Hg2+and Fe2+is energetically favorable, which also contributes to the adsorption of quencher ions. Blue fluorescent N, S-GQDs were synthesized by a facile one-pot hydrothermal treatment. Fluorescent lifetime and UV-vis measurements further validate the fluorescent quenching mechanism is related to the electron transfer dynamic quenching and IFE quenching. The as-synthesized N, S-GQDs were applied as a fluorescent probe for Fe3+and Hg2+detection. Results indicate that N, S-GQDs have good sensitivity and selectivity on Fe3+and Hg2+with a detection limit as low as 2.88 and 0.27 nM, respectively.
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CRYSTENGCOMM
·
2020
·Vol. 23
·期 2
·482-491
·
IF 3.117
Lin-Hui Wu,Shu-Li Yao,Jing Li,Hui Xu,Teng-Fei Zheng,Sui-Jun Liu,Jing-Lin Chen,He-Rui Wen
A novel luminescent CdII-based metal–organic framework {[Cd(BBIP)(TBIP)]·EtOH}n (1) derived from the multidentate 5-tert-butylisophthalic acid (H2TBIP) and the semi-rigid N-donor 3,5-bis(benzimidazol-1-yl)pyridine (BBIP) has been solvothermally synthesized and structurally characterized by using infrared spectroscopy, thermal analysis, single-crystal X-ray diffraction and powder X-ray diffraction. The adjacent CdII ions are linked by two carboxylate groups of one TBIP2− ligand with chelating mode to form a one-dimensional CdII-TBIP2− chain, which is further connected by the BBIP ligand to obtain a two-dimensional network. Interestingly, the fluorescence experiments indicate that 1 could be considered as a good multi-responsive sensing material for detecting Fe3+, MnO4−, Cr2O72−, salicylaldehyde (SA) and ethylenediamine (EDA) via the turn-off effect, with the detection limits of 0.53, 0.98, 3.6, 0.42 and 5.3 ppm, respectively. The luminescence quenching effect induced by Fe3+ could be mainly ascribed to the competitive absorption mechanism. The electron-transfer transition and competitive absorption mechanism could be used to explain the luminescence quenching of MnO4− and Cr2O72−. The turn-off effect of 1 on SA could be ascribed to the photoinduced electron-transfer and competitive absorption mechanisms. Meanwhile, the possible mechanism of fluorescence quenching caused by EDA could be attributed to the structure collapse. More importantly, 1 could be regenerated and reused after five cycles for Fe3+, MnO4−, Cr2O72− and SA detection. In a nutshell, 1 could be employed as a multi-responsive luminescent sensor used for the highly selective and sensitive detection of metal ions, anions and small organic molecules.
研究领域:
材料科学
·
分析化学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Sen Li,Jingyu Hu,Aaron Albert Aryee,Yuanqiang Sun,Zhaohui Li
Disposable medical masks are widely used to prevent respiratory infections due to their ability to block virus particles from entering the human body. The coronavirus disease 2019 (COVID-19) pandemic highlighted the importance of medical masks, leading to their widespread use around the world. However, a large number of disposable medical masks have been discarded, some carrying viruses, which have posed a grave threat to the environment and people's health, as well as wasting resources. In this study, a simple hydrothermal method was used for the disinfection of waste medical masks under high-temperature conditions as well as for their transformation into high-value-added carbon dots (CDs, a new type of carbon nanomaterial) with blue-emissive fluorescence, without high energy consumption or environmental pollution. Moreover, the mask-derived CDs (m-CDs) could not only be used as fluorescent probes for sensing sodium hydrosulfite (Na 2 S 2 O 4 ), which is widely used in the food and textile industries but is seriously harmful to human health, but also be used for detecting Fe 3+ which is harmful to the environment and human health due to its wide use in industries.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yun Ji,Zhelin Song,Yu Xu,Yanlin Zhang
In this work, typical refractory pollutant Rhodamine B (RhB) was effectively degraded by Cu-Fe LDHs/Bi 2 WO 6 composite in the photo-Fenton process. The hydrothermal synthesis of Cu-Fe LDHs/Bi 2 WO 6 composite with ethylene glycol as reductant created the multivalent coexistence of the same metal element to achieve a self-circle redox reaction between metals. The photo-Fenton process by Cu-Fe LDHs/Bi 2 WO 6 incredibly eliminated the limitation of strong acidic pH value applied in the Fenton process. ∙OH generated by Cu-Fe LDHs/Bi 2 WO 6 was 5 times that of Cu-Fe LDHs during the photo-Fenton process. The complete degradation of RhB in the photo-Fenton process under the optimal conditions of initial pH= 6, 5 mmol/L of H 2 O 2 , and 1 g/L of Cu-Fe LDHs/Bi 2 WO 6 dosage was far more than 46% of RhB degradation in the photocatalytic process and 76% of RhB degradation in the Fenton process. Cu-Fe LDHs/Bi 2 WO 6 composite exhibited the excellent redox ability, electron transfer ability and reusability during the photo-Fenton process. The acceleration of Fe 3+ /Fe 2+ cycles in the Cu-Fe LDHs/Bi 2 WO 6 /H 2 O 2 /Vis system was mainly ascribable to the combination of efficient transfer of photogenerated electrons and self-circle redox of Fe 3+ /Cu + . It is expected for the promising application of multivalent bimetallic photo-Fenton catalysts and rendering enlightenments for photo-Fenton catalytic oxidation reaction.
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