Analytical Methods
·
2016
·Vol. 9
·期 2
·259-266
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IF 1.915
Liyuan Qin,Lingjie Hou,Jia Feng,Jianbin Chao,Yu Wang,Wei Jun Jin
A new and simple julolidine based molecular receptor system L linked to 4-phenylsemicarbazide through an imine moiety has been synthesized and characterized. In HEPES-buffered MeOH–H2O (4 : 1, v/v, pH = 7.4) solution, L selectively binds Cu2+ to form a 1 : 1 ligand/metal complex, leading to a color change from green to yellow and significant fluorescence quenching at 540 nm. The in situ formed L–Cu2+ complex is further utilized to sense cyanide ions with high selectivity and fluorescence enhancement performance via metal displacement assay. The detection limit is 2.28 × 10−7 M and 1.33 × 10−8 M for Cu2+ and CN−, respectively. The sensor has been successfully applied to detect cyanide in water samples. The fluorescence imaging experiments in living cells were also demonstrated, which concludes that the sensor is capable of sensing Cu2+ and CN− in living cells.
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INTERNATIONAL JOURNAL OF ANTIMICROBIAL AGENTS
·
2024
·
IF 4.9
Xinyuan Peng,Qingtao Kong,Qian Wei,Shilin Guo,Qiying Chen,Min Peng,Binyi An,Xiaoyu Wang,Chen Zhang,Hong Sang
Currently, the therapeutic effect on cryptococcal infection patients is hindered by toxicity and drug resistance, making it urgent to discover alternative antifungals. Calcium channel blockers, verapamil (VER), have shown effective antifungal effects in several fungi. Here, we found that VER has a significant antifungal effect on Cryptococcus neoformans ( C. neoformans ). Furthermore, VER has significant synergistic effects with multiple antifungals, even caspofungin (CAS). We confirmed that VER and CAS had a synergistic antifungal effect in the Galleria mellonella . We conducted in-depth research on the possible mechanism of the synergistic impact of VER and CAS. After treatment with VER, the chitosan content of C. neoformans ' cell wall decreased and in dopamine liquid culture medium, we observed the leakage of melanin. Through cell wall fluorescence staining and stress sensitivity analysis, we further demonstrated that VER impaired the integrity of the C. neoformans ' cell wall. Another side, VER+CAS modification of C. neoformans membrane permeability, leading to intracellular ROS accumulation and mitochondrial membrane potential changes. VER eliminated the cytoplasmic calcium fluctuations caused by CAS stimulation and down-regulated the genes expression associated with the calcineurin pathway. In addition, we found that the enzyme activity of chitin deacetylase of C. neoformans is significantly influenced by the presence of Ca 2+ , suggesting that the use of VER may affect the activity. In summary, the synergistic antifungal effect of VER and CAS makes them effective and promising candidates for fungal treatment.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Gang Ni,Mengmeng Sun,Ning Wang,Zhiqiu Pan,Fuhu Cao,Peng Cui,Chenggang Zhou
As promising candidates for large-scale energy storage applications, aqueous zinc ion batteries (AZIBs) face challenges due to the electrochemical instability of cathode materials and Zn anodes. Introducing additives into the electrolyte is an effective approach to improving the compatibility of electrodes. In this work, trace amounts of poly(acrylic acid) (PAA) are utilized as electrolyte additives in 1.0 M ZnSO4 to enhance the cycle performance of the Zn3[Fe(CN)6]2/Zn battery. PAA demonstrates strong interfacial engineering ability on both the cathode and anode. PAA directly reacts with the Zn anode, leading to the formation of PAA–Zn films growing on the anode surface. The interfacial film inhibits the parasitic hydrogen evolution reactions, reducing the generation of byproducts. Regulating the anode’s interfacial structure promotes the uniform deposition of Zn. The electrolyte with 0.8 wt % PAA additives enables a long cycle life exceeding 300 h at 5 mA·cm–2 and 2.5 mAh·cm–2 in Zn/Zn symmetric cells, along with a high Coulombic efficiency of 98.07% in Cu/Zn asymmetric cells. Meanwhile, PAA preferentially adsorbs on the surface of the Zn3[Fe(CN)6]2 cathode, inhibiting the dissolution of ferricyanide anions in aqueous solution and reducing the self-discharge behavior. Thanks to the interfacial regulation of PAA on both the cathode and anode, the cycle performance of the Zn3[Fe(CN)6]2/Zn full cell is significantly enhanced to nearly six times that without PAA additives. This work lays the groundwork for the development of electrolyte additives that can improve the electrochemical performance of both the cathode and anode of AZIBs.
研究领域:
电化学
·
能源存储
·
材料科学
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Mojing Chen,Xiaoqiang Li,Yujiao Yan,Yanting Yang,Qunjie Xu,Haimei Liu,Yongyao Xia
Prussian blue analogues (PBAs) have been considered as promising cathodes for aqueous zinc-ion batteries because of their open framework for accommodating large ions, tunable valence state, and facile synthesis. Among PBAs, potassium manganese hexacyanoferrate (KMHCF) is favored due to its high working voltage, high specific capacity, and low cost. However, it suffers from severe capacity decay and poor rate capability, which are mainly a result of poor intrinsic conductivity, irreversible phase transition, transition metal dissolution, and structural collapse during charge/discharge cycling. These issues extremely limit its practical application. In order to solve these problems, conductive polypyrrole (PPy) was used to coat KMHCF microcubes to form KMHCF@PPy composites to achieve superior rate capability and prolonged cycle life. With the PPy coating, the KMHCF@PPy composite delivers a discharge capacity of 107.6 mA h g–1 after 100 cycles at 100 mA g–1, and even at 500 mA g–1 after 500 cycles, 64.2 mA h g–1 still remained. The excellent electrochemical performance can be attributed to the effects from PPy. On the one hand, PPy supplies an effective electronic transmission network for KMHCF to enhance the electronic conductivity. On the other hand, it plays the role of a protective layer to effectively inhibit the dissolution of Mn and the phase transition during the cycling.
研究领域:
材料科学
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电化学
·
能源存储
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Chen Liu,Huanxuan Li,Chen Xu,Zijie Shi,Xueheng Wei,Zhitong Yao,Shaodan Xu,Jingang Huang,Mingzhi Huang
The increasing complexity and concentration of refractory organic pollutants in industrial wastewater necessitate the development of efficient and stable advanced oxidation processes (AOPs). Herein, metal–organic framework (MOF)-derived Co₃Fe₇@CN carbon composites were successfully fabricated and evaluated as peroxymonosulfate (PMS) activators for the degradation of oxytetracycline (OTC). Among the as-prepared catalysts, Co₃Fe₇@CN-1 exhibited superior catalytic performance, achieving 90% OTC removal within 10 min with an apparent rate constant ( k obs ) of 0.158 min −1 , which represents a 1.7- and 1.5-fold enhancements over Co₃Fe₇@CN-2 and Co₃Fe₇@CN-3, respectively. The outstanding activity of Co₃Fe₇@CN-1 is primarily attributed to its favorable pore structure and pronounced adsorption–catalysis synergy. Specifically, Co₃Fe₇@CN-1 and Co₃Fe₇@CN-3 achieved 23% and 21% of OTC removal via adsorption, respectively, whereas the dense structure of Co₃Fe₇@CN-2 significantly impeded pollutant uptake (<5%). Mechanistic investigations revealed that PMS activation is driven by the synergistic redox cycling of Co (Co 0 /Co(II)/Co(III)) and Fe (Fe 0 /Fe(II)/Fe(III)) species. Electrons transferred from zero-valent and low-valent metals promote O O bond cleavage in PMS, triggering the generation of SO₄• − and •OH radicals. Crucially, the Fe species acts as an electron reservoir to accelerate the reduction of Co(III) to Co(II), thereby effectively circumventing the rate-limiting step of the Co redox cycle. Simultaneously, high-valent Fe(III)/Co(III) species interact with PMS to form high-valent metal-oxo intermediates ( Fe(IV) O and Co(IV) O), which serve as the predominant reactive species responsible for OTC degradation. The coexistence of radical and non-radical pathways ensures efficient OTC degradation. This work establishes a controllable strategy for constructing MOF-derived carbon catalysts and elucidates the structure–activity relationship between pore architectures and redox centers.
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Journal of Materials Chemistry A
·
2026
·
IF 9.5
Qing Cheng,Yuqi Zhang,Yingying Cao,Long Liu,Yanqiang Zhang
The novel ionic liquid-H2O2 propellants are urgently to solve the intrinsic ignition problem for achieving the aerospace applications. We addressed this issue by tuning the d-band center to adjust the catalyst's adsorption strength for IL/H2O2 toward the optimal value, thus enhancing catalytic activities for the efficient decomposition of H2O2 to generate reactive oxygen species. Herein, the regulation of the d-band center of Cu(I) in Cu(I)-MOF catalyst by precise ligand engineering design was studied. Remarkably, The Cu-S3 coordination of Cu-SH' shifts its d-band center closer to the Fermi level, promoting the adsorption of [BMIM]N(CN)2 and H2O2. Cu-SH' enables efficient H2O2 activation and robust •OH and 1 O2 generation to trigger the rapid self-ignition of [BMIM]N(CN)2-H2O2 propellant. The resulted tid as low as 18.4 ms is nearly 34% lower than that of homogeneous catalyst [FcCH2N(CH3)3]2[Cu2I4]. This work provides fundamental insights into the design of efficient ligand-based combustion catalysts for the higher performance of rockets and spacecrafts.
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BIOELECTROCHEMISTRY
·
2023
·
IF 5
Mengjiao Zhu,Yu Liu,Meiyue Wang,Tao Liu,Zhenyu Chu,Wanqin Jin
Owing to the high mortality and strong infection ability of COVID-19, the early rapid diagnosis is essential to reduce the risk of severe symptoms and the loss of lung function. In clinic, the commonly used detection methods, including the computed tomography (CT) and reverse transcription-polymerase chain reaction (RT-PCR), are often time-consuming with bulky instruments, which normally require more than one hour to report the results. To shorten the analytical period for testing the COVID-19 virus (SARS-CoV-2), we proposed an ultrafast and ultrasensitive DNA sensors to achieve an accurate determination of the DNA sequence by the RNA reverse transcription (rtDNA) of the SARS-CoV-2. A nanocubic architecture of the MnFe@Pt crystals was constructed to integrate both electrocatalysis and conductivity to greatly improve the biosensing performance. After the immobilization of a specific capture and report DNA on above nanocomposite, the rtDNA can be rapidly caught to the DNA sensor to form a double-helix structure, thus generating the current signal change. Within only 10 min, the as-prepared DNA sensors exhibited ultralow detection limit (1 × 10 −20 M) and wide linear detection range, together with an outstanding selectivity among various interfering substances.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Menglu Xu,Yibing Zhang,Huaqin Yin,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
Co-ZFO@Mn-CN with 1 O 2 and O 2 •− as main reactive oxygen species was synthesized for catalytic ozonation , which could efficiently degrade organic pollutants . EPR and XPS analysis indicated that lattice doping of Co induced formation of abundant of OVs, which could provide localized electrons for O 3 activation with the generation of HO 2 • /O 2 •− . 1 O 2 and H 2 O 2 were produced by the recombination of HO 2 • /O 2 •− . DFT calculation demonstrated that H 2 O 2 was deprotonated to generate HOO − , which preferred to form HOO-Mn-N X bonds with Co-ZFO@Mn-CN. Under the attack of O 3 , HOO-Mn-N X bonds were broken with the generation of HO 2 • and HO 3 • /O 3 •− , not only accelerating 1 O 2 production for organics degradation but also avoiding Mn(Ⅱ) sites oxidation . Combining advantages of OVs and HOO-Mn-N X , Co-ZFO@Mn-CN achieved 70–100% mineralization for different organic pollutants . Thus, this work provided a simple and efficient way for enhancing the utilization of O 3 by the synergistic effect of OVs and HOO-Mn-N X bonds, also improving ROS transformation.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Lei Zhao,Zilong Zhang,Tianyuan Zhang,Xiang Wang,Huanjun Peng,Jingdong Peng
The Fenton reaction in advanced oxidation processes is an ideal pathway for the generation of highly reactive hydroxyl radicals (•OH). However, its application in organic wastewater treatment is limited due to the requirement for acidic pH conditions and the additional introduction of H2O2 and Fe2+. In this study, FeOOH–CN/Ni(OH)2 composites were constructed as photocatalysis-self-Fenton catalysts by the amorphous FeOOH, which was uniformly anchored onto the surface of pure g-C3N4 (carbon nitride (CN)), and Ni(OH)2 was assembled on top. In this process, FeOOH–CN/Ni(OH)2 achieved self-sufficiency in H2O2 production while enabling efficient degradation of tetracycline hydrochloride (TCH) over a wide pH range, with a degradation ratio of up to 98.82%, and a first-order reaction rate constant (k) was determined to be 0.04925 min–1, representing a 10.15 times enhancement compared to the pristine CN. A reasonable S-scheme heterojunction charge migration mechanism was demonstrated based on valence-band X-ray photoelectron spectroscopy (VB-XPS), atomic force microscopy (AFM) equipped with a Kelvin probe force microscope, and density functional theory (DFT) theoretical calculations. Furthermore, degradation experiments demonstrated that the catalyst possesses remarkable degradation efficiency for other contaminants as well. On one hand, this significant improvement can be attributed to the formation of an S-scheme heterojunction between Ni(OH)2 and CN, which not only increased the specific surface area of the composite but also remarkably enhanced the separation and transfer efficiency of photogenerated charges. On the other hand, the synergistic effect between Ni and Fe effectively facilitated the activation of H2O2 and promoted the cycling of Fe3+/Fe2+. This study provided an efficient visible-light-driven photocatalysis-self-Fenton system, offering novel perspectives for enhancing Fenton-based processes and advancing the application of Fenton reactions in the treatment of organic wastewater.
研究领域:
环境化学
·
材料科学
·
光催化
·
水处理技术
·
物理化学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Ling-Juan Yan,Chen Jiang,Ai-Ying Ye,Qiong He,Cheng Yao
Hydrazine plays an important role in chemistry, pharmaceuticals, agriculture and aerospace. However, it is not to be underestimated and has been identified as harmful to the human body. Therefore, it is significant and urgent to develop the detection of hydrazine in vivo and in vitro. Here, the probe TAN was synthesized by using benzothiazole derivatives as the fluorophore and 2,3-diaminomaleonitrile as the identified group to detect hydrazine. The presence of hydrazine resulted in a colorimetric and ratiometric fluorescence response of the probe based on the formation of hydrazone. The detection limit of TAN was 0.31 µM for hydrazine. In addition, the probe TAN was successfully used to visualize hydrazine in living HepG-2 cells and mouse with low cytotoxicity and excellent biocompatibility.
研究领域:
分析化学
·
生物医学工程
·
毒理学
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Jingrong Zhai,Qiaoling Kang,Qiuyue Liu,Dawei Lai,Qingyi Lu,Feng Gao
Three-dimensional (3D) network structure of metal–organic framework (MOF) can accommodate outstanding electrocatalysis performances, but always collapse during the conversion to active materials or applications process. How to maintain the 3D network when producing active species is of great importance for full application of MOF. Herein, a new MOF material, In[Co(CN) 6 ] (In-Co PBA) nanocubes, are firstly synthesized. Through a controlled low-temperature deligandation process, the In-Co PBA nanocubes are transformed to a novel In 2 O 3 @In-Co PBA quasi-MOF nanocubes, which basically retain the 3D porous structure of PBA but with in situ generated In 2 O 3 nanoparticles inside. When used as CO 2 RR electrocatalyst , such a novel cubic composite structure exhibits excellent performances with faradaic efficiency of 85% for formate at a potential of −0.96 V and with current density of 31.5 mA·cm −2 at −1.32 V, surpassing most of the reported indium-based catalysts. The excellent performance can be attributed to the special composite structure, which provides not only active sites by In 2 O 3 nanoparticles to catalyze CO 2 RR, but also the 3D porous framework by quasi-MOF to accelerate gaseous exchange and electrolyte permeation and prevent the electrode choking. This work offers a new strategy for the design of post-transition metal catalysts and the structure design of quasi-MOF.
研究领域:
材料科学
·
电化学
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Jiliang Ma,Junqiang Zhang,Dongnv Jin,Shuangquan Yao,Runcang Sun
Synchronous photocatalytic water splitting and the reforming of a biomass-derived feedstock to generate hydrogen and high-value-added chemicals make full utilization of the biomass-water-splitting redox reaction; however, limited successes in this regard have been reported. Herein, incompletely polymerized graphitic carbon nitride co-doped with zinc/oxygen atoms (Zn 2 /O@IP- g -CN) was prepared via a step-by-step low-temperature calcination process with the assistance of melamine and zinc phthalocyanine, which successfully resulted in simultaneous photocatalytic water splitting and the reforming of biomass-derived monosaccharides to produce hydrogen (11436.7 μmol g −1 h −1 ) and lactic acid (92.6 %), respectively. Zn 2 /O@IP- g -CN exhibits a fast separation/migration rate and low resistance compared to those of pure CN, resulting in Zn 2 /O@IP- g -CN showing enhanced photocatalytic activity. The hydrogen release rate of 86.8 % and lactic acid yield of 89.0 % were retained compared to initial values when Zn 2 /O@IP- g -CN was reused in 5 th cycles. Poisoning experiments indicated that 1 O 2 , ·O 2 - , ·OH, and h + were all beneficial for lactic acid production.
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