查找使用阿拉丁产品的科研文献

Solid-state electrochemiluminescence sensor based on g-C3N4@ZIF-8 for ultrasensitive and specific detection of sulfapyridine

Chao Li,Juan Lu,Yanjia Guo,Jing Wang,Yujia Song,Ruidan Li,Li Tian,Xuwen Li

In this study, a solid-state electrochemiluminescence (ECL) sensor was developed for ultrasensitive and specific detection of sulfapyridine (SPY) using graphitic carbon nitride (g-C 3 N 4 ) as a luminescent reagent. The sensor was fabricated by sequentially coating composite material g-C 3 N 4 @ZIF-8 and Nafion onto the electrode surface. The g-C 3 N 4 , synthesized through high-temperature pyrolysis of melamine, generated a sensitive ECL signal in K 2 S 2 O 8 solution. And g-C 3 N 4 served as a carrier for ZIF-8, with the latter acting as a co-reaction promoter within the g-C 3 N 4 -K 2 S 2 O 8 system, leading to a significant enhancement of the ECL signal. Additionally, molecularly imprinted polymers (MIPs) with SPY were introduced to further enhance the performance of the sensor by specifically recognizing SPY. Under optimal conditions, the prepared ECL sensor showed sensitive measurement of SPY in the linear range of 5.0 × 10 −13  ∼ 5.0 × 10 −8 mol/L, with a detection limit (LOD) of 1.67 × 10 −13 (S/N = 3). The developed MIP-ECL sensor demonstrated good stability, high sensitivity, and reliable reproducibility, thus making it suitable for detecting SPY in real samples.

Simultaneously enhanced gas separation performance and long-term stability by thermally treated ZIF-8-based nanocomposite membranes

Kaihua Li,Yuchao Ma,Wei Zhao,Leixin Yang,Jinwei Zhang,Qian Zhang,Xiaohua Ma,Long Jiao,Zhen Yin,Bowen Cheng

The challenges of trade-off effect and long-term stability pose huge obstacles in the application of polymer-based gas separation membranes. In this study, we proposed a novel strategy to overcome these problems by in-situ thermally treating ZIF-8/polyimide mixed-matrix membranes (MMMs) at 300 °C. After thermally treatment, the T-ZIF-8 produced some unsaturated Zn site as defects that decreased BET surface area and the shrunk of micropore size as compared with ZIF-8. The MMMs with T-ZIF-8 significantly affects their gas separation performance and long-term stability, in which, the H 2 /CH 4 and CO 2 /CH 4 separation performance of T-ZIF-8/PI(3:10) and T-ZIF-8/PI(6:10) increased from far below the 2008 trade off lines for their PI matrix to approach or even above that. Additionally, both higher permeability and selectivity were observed for T-ZIF-8/PI(6:10) as compared with its precursor for H 2 /CH 4 separation, which was contributed by its higher H 2 diffusion coefficient (3834 vs 580 × 10 -8 cm 2 s −1 ) and H 2 /CH 4 diffusion selectivity (240 vs 154). Furthermore, the T-ZIF-8/PI (1:10) and T-ZIF-8/PI(3:10) MMMs demonstrate less than 15 % H 2 decreasing after 150 days, which is much better than that of the pristine PI membrane (26.7 %). These results probably contributed by the defected ZIF-8 loading induced extra ultra-micropore that caused size sieving effect and strong interaction with polyimide matrix that formed more rigid polymer chains. These findings propose a strategy to effectively enhance the gas separation performance and long-term stability by in-situ introducing the defect MOF in the polymer matrix.

Pd3@ZIF-67-derived catalyst with low palladium loading for efficient hydrogen production via ammonia borane hydrolysis

Ji Xiang,Yudong Zhao,Penglin Xu,Xinhui Xia,Fanfan Wu,Zhipeng Wang,Hailong Zhu,Yanzhen Lu,Xiao Yang,Fangkuo Wang

The rapid development of hydrogen storage-related technologies has promoted the commercialization of the hydrogen energy industry. Ammonia borane (AB) has the advantages of good reaction controllability, high hydrogen purity, good hydrogen storage capacity and environmentally friendly by-products. It is one of the most studied hydrogen storage materials at present. In this study, [Pd 3 Cl(PPh 2 ) 2 (PPh 3 ) 3 ] + (Pd 3 ) nanoclusters stabilized by triphenylphosphine were successfully deposited into ZIF-67 via an in-situ synthesis approach. A series of Pd₃@ZIF-67 derivatives with low palladium loading were subsequently prepared through heat treatment at varying temperatures (Pd₃@ZIF-67–100, Pd₃@ZIF-67–200, Pd₃@ZIF-67–300, Pd₃@ZIF-67–400, Pd₃@ZIF-67–500, and Pd₃@ZIF-67–600). The influence of varying heat treatment temperatures on the hydrolytic activity of AB catalyzed by the Pd₃@ZIF-67-derived nanocatalyst was systematically investigated. The results show that the Pd 3 @ZIF-67 derived catalyst exhibits excellent catalytic activity due to the presence of a synergistic effect of palladium and Co 3 O 4 . Specifically, the turnover frequency (TOF) based on the active palladium content for the hydrolysis of AB at 298 K were determined as follows: 4431.88 mol H2 ·min −1 ·mol Pd −1 (Pd 3 @ZIF-67–200), 4880.65 mol H2 ·min −1 ·mol Pd −1 (Pd 3 @ZIF-67–300), 2586.81 mol H2 ·min −1 ·mol Pd −1 (Pd 3 @ZIF-67–400), 4160.14 mol H2 ·min −1 ·mol Pd −1 (Pd 3 @ZIF-67–500), 3449.82 mol H2 ·min −1 ·mol Pd −1 (Pd 3 @ZIF-67–600). As the calcination temperature rises, the structure of the Pd 3 @ZIF-67 derived catalyst undergoes a gradual transformation from a complete framework to partial collapse and finally reconstruction. Structural changes led to a distinct "inverse volcano" tendency in the catalytic activity of Pd 3 @ZIF-67 derived catalysts. This hybrid catalyst design strategy optimizes the utilization of noble metal elements and provides a universal platform for the development of efficient metal matrix composite nanocatalysts.

Ultrafine low loading AgCu nanoclusters supported on defective ZIF-8 for the click reaction with high stability

Xinghao Li,Sara Ajmal,Penghui Fang,Xiaoxing Zhou,Maoni Lu,Sichen Li,Ping Chen,Peng Li,Manzhou Zhu

Ultrafine metal nanoclusters have been extensively studied due to their fascinating chemical characteristics. In this work, ultrafine AgCu nanoclusters are synthesized and loaded on the defective ZIF-8 (denoted as AgCu/D-ZIF-8). The findings show that the as-obtained AgCu/D-ZIF-8 catalysts with low AgCu loading (0.387 wt%) exhibit outstanding catalytic performance and recyclability for the reaction of azide–alkyne cycloaddition (click reaction) at 35 °C. Compared with monometallic Ag25/D-ZIF-8 and Cu25/D-ZIF-8 catalysts, bimetallic AgCu/D-ZIF-8 catalysts present exceptional activity for the click reaction. Additionally, AgCu/D-ZIF-8 catalysts display a higher yield of target product for this reaction compared to AgCu/ZIF-8. The experimental results suggest that some defective sites in D-ZIF-8 are occupied by AgCu nanoclusters, which may be key to improving the activity and recyclability of AgCu/D-ZIF-8 catalysts. Consequently, this work provides valuable insights for designing ultrafine bimetallic catalysts with high performance.

ZIF-8 based bifunctional coatings with anticorrosive and antibacterial properties: A new design strategy for more efficiency

Wenquan Kong,Maria Serdechnova,Valeryia Kasneryk,Dahai Gao,Hao Wang,Xinyuan Xie,Carsten Blawert,Mikhail L. Zheludkevich,You Zhang

An efficient and simple in-situ/mechanical two-step strategy has been discovered for the fabrication of nanocontainers based on zeolite imidazole framework-8 (ZIF-8) with corrosion inhibitors (benzotriazole, BTA). The nanocontainers were applied in anticorrosive coatings with anticorrosion and antibacterial bifunctions for aluminum alloys AA2024. The effects of ZIF-8 modified with the corrosion inhibitor via different methods (in-situ, mechanical, and two-step strategies) on its morphology, composition, structure, loading/release behavior were studied and discussed. Results showed that the amount of loaded BTA was positively correlated with the crystal size of the final ZIF-8, impacting sustained release. Compared with the conventional primary load (in-situ and mechanical loading way), the two-step loading method (in-situ followed by mechanical treatment) achieved a higher BTA loading without evident ZIF-8 morphology and structure changes. The two-step modified (2-BTA@ZIF-8) powders exhibited good corrosion inhibition and remarkable antibacterial properties against Escherichia coli and Staphylococcus aureus . Additionally, the 1-BTA@ZIF-8 (in-situ strategy), 1-BTA/ZIF-8 (mechanical strategy) and 2-BTA@ZIF-8 composites were dispersed in acrylic resin to prepare anticorrosive and antibacterial bifunctional coatings. Results showed that the 2-BTA@ZIF-8 incorporated acrylic coatings exhibited superior anticorrosion performance and antimicrobial activity compared to the unmodified coating due to the controlled release of BTA. Thus, elaborated strategy represents a feasible and effective way to construct high-performance anticorrosive and antimicrobial coatings with metal-organic framework materials.

ZIF-67-Derived Porous Carbon Nanosheets Decorated with Co Nanoflakes As Bifunctional Electrocatalysts for Overall Water Splitting

Haixia Zhang,Wenyuan Dai,Ru Liu,Junying Xiang,Yanhui Song,Ying Hou,Hong Wei,Peizhi Liu,Bingshe Xu,Jianguo Liang,Junjie Guo

ZIF-67-derived Co–N–C catalysts exhibit efficient water-splitting performance and thus have attracted intense research interest. However, the serious Co agglomeration and loss of most N atoms due to high-temperature pyrolysis limit the further improvement of their electrocatalytic performance. Herein, we report a ZIF-67-derived 2D porous N-doped carbon nanosheet decorated with a Co nanoflake catalyst (Co@NC/CC-500) for OER and HER by a facile pyrolysis method at a low temperature of 500 °C. Benefiting from the ultrahigh N doping (12 atom %) and uniformly dispersed Co nanoflakes on 2D porous carbon nanosheets, which lead to a high content of Co–N active sites, the Co@NC/CC-500 catalyst exhibits outstanding performance toward the HER and OER with overpotentials of 95 and 183 mV at 10 mA cm–2 in 1 M KOH, respectively. Furthermore, the alkaline water electrolyzer using Co@NC/CC-500 as the cathode and anode catalysts can achieve a current density of 10 mA cm–2 at a cell voltage of 1.52 V. This special low-temperature production method may be extensively utilized to create precisely defined monometal or bimetal nanoflakes decorated on 2D porous N-doped carbon nanosheets for diverse electrochemical energy applications.

ZIF-8-Based Nitrogen and Monoatomic Metal Co-Doped Pyrolytic Porous Carbon for High-Performance Supercapacitor Applications

Xiaobo Han,Yihao Geng,Jieni Wang,Shuqin Zhang,Chenlin Wei,Leichang Cao,Shicheng Zhang

Metal–organic frameworks (MOFs) receive wide attention owing to their high specific surface area, porosity, and structural designability. In this paper, ZC-Ru and ZC-Cu electrodes loaded with monatomic Ru and Cu doped with nitrogen were prepared by pyrolysis, ion impregnation, and carbonization process using ZIF-8 synthesized by static precipitation as a precursor. ZC-Cu has a high specific surface area of 859.78 m2g−1and abundant heteroatoms O (10.04%) and N (13.9%), showing the specific capacitance of 222.21 F g−1at 0.1 A g−1in three-electrode system, and low equivalent series resistance (Rct: 0.13 Ω), indicating excellent energy storage capacity and electrical conductivity. After 10,000 cycles at 1 A g−1in 6 M KOH electrolyte, it still has an outstanding capacitance retention of 99.42%. Notably, symmetric supercapacitors ZC-Cu//ZC-Cu achieved the maximum power density and energy density of 485.12 W·kg−1and 1.61 Wh·kg−1, respectively, positioning ZC-Cu among the forefront of previously known MOF-based electrode materials. This work demonstrates the enormous potential of ZC-Cu in the supercapacitor industry and provides a facile approach to the treatment of transition metal.

ZIF-8-Encapsulated Pexidartinib Delivery via Targeted Peptide-Modified M1 Macrophages Attenuates MDSC-Mediated Immunosuppression in Osteosarcoma

Jiabao Dong,Xupeng Chai,Yucheng Xue,Shiyun Shen,Zhuo Chen,Zetao Wang,Eloy Yinwang,Shengdong Wang,Liang Chen,Fengfeng Wu,Hengyuan Li,Zehao Chen,Jianbin Xu,Zhaoming Ye,Xiongfeng Li,Qian Lu

Adoptive cellular therapy is a promising strategy for cancer treatment. However, the effectiveness of this therapy is limited by its intricate and immunosuppressive tumor microenvironment. In this study, a targeted therapeutic strategy for macrophage loading of drugs is presented to enhance anti-tumor efficacy of macrophages. K7M2-target peptide (KTP) is used to modify macrophages to enhance their affinity for tumors. Pexidartinib-loaded ZIF-8 nanoparticles (P@ZIF-8) are loaded into macrophages to synergistically alleviate the immunosuppressive tumor microenvironment synergistically. Thus, the M1 macrophages decorated with KTP carried P@ZIF-8 and are named P@ZIF/M1-KTP. The tumor volumes in the P@ZIF/M1-KTP group are significantly smaller than those in the other groups, indicating that P@ZIF/M1-KTP exhibited enhanced anti-tumor efficacy. Mechanistically, an increased ratio of CD4+ T cells and a decreased ratio of MDSCs in the tumor tissues after treatment with P@ZIF/M1-KTP indicated that it can alleviate the immunosuppressive tumor microenvironment. RNA-seq further confirms the enhanced immune cell function. Consequently, P@ZIF/M1-KTP has great potential as a novel adoptive cellular therapeutic strategy for tumors.

ZIF-derived carbon/BN/CMF composite PCM for enhanced latent thermal storage, photothermal conversion, and thermal insulation

Xiangfei Kong,Ruiming Nie,Jianjuan Yuan

ZIF-Derived Co Nanoparticles Embedded in Pumpkin Seedlike, Hollow N-Doped Carbon Structures for Efficient Microwave Absorption

Xueyun Han,Siyu Zhang,Lei Qiao,Peidong Peng,Chenghao Fu,Ke Liu,Zhongjun Ma

Metal–organic framework (MOF)-derived materials have gained popularity as microwave absorbing materials due to their electromagnetic dissipation advantages. In this study, a special type of MOF (ZIF-L) was used as a precursor; tannic acid was introduced for chemical etching. The resulting material obtained by in situ carbonization was a hollow structure of N-doped carbon embedded by Co nanoparticles (CoHNC), which retained the original pumpkin seed shape but had a hierarchical porous structure on the inside. By adjustment of the amount of cobalt nitrate and the carbonation temperature, the electromagnetic parameters could be altered, improving impedance matching and enabling different microwave absorption properties to be obtained. At 16.96 GHz, the material exhibits an optimal reflection loss of −45.5 dB, an effective bandwidth of 3.04 GHz, and a matching thickness of only 1.4 mm with a material filler of 30 wt %. The microwave loss mechanism is formed by the dual loss mechanism with dielectric loss as the main loss and magnetic loss as the auxiliary one. Therefore, the synthesis of the CoHNC composite through simple etching provides a useful idea for optimizing microwave absorbing materials.

Polyaniline modified bimetallic hydroxide/ZIF composites as electrode materials for supercapacitors with high capacity and high stability

Jinyue Yang,Jianxin Wang,Chunhua Lou,Yuhan Cui,Xin Huang,Haixia Yu,Liming Bai,Wendi Wang,Xinyou Zhang,Hong Pan

Metal-organic framework materials (MOFs) are widely used in electrochemical energy storage due to their abundant active sites and high redox activity. Especially in the field of supercapacitors, the porous structure of MOFs makes them the most promising candidates for composite electrode materials due to their vast specific surface area. However, the poor chemical stability of MOFs in alkaline electrolytes limits their application. Constructing and improving the stability of metal-organic backbone materials through rational structural design is the key to enhancing the electrochemical performance of capacitors. In this paper, the stability of ZIF-67 was enhanced by the complexing with bimetallic hydroxide (CoMn-LDH), and the conductivity is further enhanced by the mixing of polyaniline (PANI) to form a ``network structure'' morphology. As a result, the composite electrode material has a specific capacity of 1048 F g −1 at 1 A g −1 with a good cycle life (80.5 % capacity retention for 5000 cycles). The specific capacity of the CoMn-LDH/ZIF-67/PANI//AC asymmetric supercapacitor (ASC) was 164 F g −1 at 1 A g −1 in the voltage range of 0–1.5 V. The maximum energy density of the ASC was 51.25 Wh kg −1 at a power density of 2250 W kg −1 . In addition, excellent cycling stability (71.2 % capacitance retention after 5000 cycles) was delivered.

Surface-engineered MnO₂@Au@ZIF-67 hierarchical catalysts for acid-triggered antibacterial therapy and infected wound healing

Mengmeng Xu,Yuan Liu,Zhe Tang,Xiaolin Yu,Li Gao,Bo Yang,Yan Wang,Xuehui Dong,Qianqian Yu,LinGe Wang

Rational surface engineering of nanocatalysts offers new solutions against antibiotic-resistant infections. We designed and fabricated hierarchical MnO₂@Au@ZIF-67 nanoparticles (NPs) with triple interfacial functionalities for synergistic antibacterial therapy. The acid-responsive ZIF-67 surface degrades in infected wounds, releasing Co²⁺ to catalyze •OH generation via Fenton-like reactions at the material-bacteria interface. Simultaneously, ultrasmall Au surfaces deplete glucose through oxidase-mimetic catalysis, producing gluconic acid that accelerates ZIF-67 dissolution. The MnO₂ core surface decomposes H₂O₂ to supply O₂, enhancing Au catalysis and alleviating hypoxia. Comprehensive surface characterization (TEM, SEM, XPS, XRD) confirmed structural integrity and reactive sites. In vitro , the NPs achieved > 99 % bacterial killing (S. aureus/E. coli ) through ROS-mediated membrane disruption (validated by SEM/CLSM). In vivo , they enabled 98.45 % bacterial clearance and accelerated wound healing via collagen reorganization (H&E/Masson staining). This surface-engineered platform demonstrates how interfacial catalytic cascades can be harnessed for effective non-antibiotic antimicrobial applications.