Molecular Systems Design & Engineering
·
2023
·Vol. 9
·期 2
·205-213
·
IF 3.6
Chao Li,Fengchuan Guo,Zongxin Li,Naipu He,Wen Li,Xuerui Zhao
A chitosan/ZIF-8 hydrogel (CGsZx) was fabricated by in situ nucleation and growth of ZIF-8 crystals with a tunable morphology in chitosan hydrogel (CG) networks, and used as an ideal adsorbent for CO2. The CG has heterogeneous nucleation sites and was then soaked sequentially in a methanolic solution of Zn(NO3)2·6H2O and then a methanolic solution of 2-methylimidazole (2MeIM), and then combined with Zn2+ by forming a Zn–N coordination bond, and then the ZIF-8 crystals were formed on the CG. The growth and distribution of the ZIF-8 crystals in the CG network were achieved by regulating the molar ratio of Zn2+ to the glucosamine of the CS. In particular, the ZIF-8 crystals with spherical, cubic, tetrahedral, and cuboid shapes on the CGsZx were tuned by adjusting the molar ratio of Zn2+ to the glucosamine of CS. In addition, the ZIF-8 crystal with a petaloid morphology on the CG was obtained by using sodium tripolyphosphate (STPP) as a crosslinker. The synergistic effect of heterogeneous nucleation and coordination modulation were the main factors for the change of morphology and size of ZIF-8. The CGsZx exhibited a 441.7% adsorption capacity for CO2 which was higher than that of CG, and 65.3% higher than that of ZIF-8. After recycling five times, the adsorption capacity of the composite for C2 remained at 89.6%. The kinetics simulation indicates that the adsorption behaviour of CGsZx for CO2 was physical adsorption.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Weidong Liu,Jie Bai,Yaqiong Gong
Hydrogen fuel cells (HFCs) and water electrolysis are emerging clean energy technologies that can alleviate the problems of environmental pollution and energy shortage. Oxygen Extraction Reaction (OER) is a slow four-electron transfer process with a high energy barrier, and often regarded as the bottleneck of a series of clean energy technologies. In this paper, NiMoO 4 nanorods (denoted as NMO) were in situ grown on nickel foam substrate, and then ZIF-67 nanoparticles were assembled onto NiMoO 4 nanorods (denoted as NMO@ZIF-67). Finally, the surface layers of NiMoO 4 nanorods and ZIF-67 nanoparticles were vulcanized by hydrothermal treatment for 6 h to obtain the catalyst NiMoO 4 @NiMoCo-S-6 (denoted as NMO@NMC-S-6). In 1 M KOH aqueous solution, NMO@NMC-S-6 exhibited excellent electrochemical performance, only 176 mV and 243 mV overpotentials were required at current densities of 10 and 100 mA cm -2 , respectively, and Tafel slope of NMO@NMC-S-6 is 24.81 mV dec -1 . In addition, benefitting from the combined structure of nanorods and nanoparticles effectively prevented nanoparticles aggregation and enhanced its own structure and transport channel stability, NMO@NMC-S-6 showed remarkable stability in 20 h electrochemical test. This work brings a reference orientation for constructing cost-efficient alkaline OER catalyst through structure combination strategy.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 6
·1255-1261
·
IF 1.6
Tan Shifeng,Tu Wenmao,Pan Hongfei,Zhang Haining
Catalysts consisting of Zeolite imidazolyl ester skeleton-67 (ZIF-67) and graphene oxide (GO) were fabricated through a solvothermal method, followed by etching ZIF-67 with oxygen-rich functional groups on GO in a reduction atmosphere at 400 °C. During this process, an open type of cobalt metal center was formed by the partial vaporization and oxidation of ZIF-67, further reducing to Co and partially combining with oxygen species to amorphous CoO x . Benefiting from the rich functional N, and metal/oxides active centers derived from the calcination process, the synthesized Co/CoO x @NSG-400 showed a low OER overpotential of 10 mA·cm −2 at 298 mV, and an ORR half-wave potential of 0.8 V, which demonstrated its excellent bifunctional catalytic activity. Such a controllable calcination strategy with high yields could be expected to pave the way for synthesizing low-cost and efficient bifunctional electrocatalysts.
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JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Yiqiong Yang,Borui Jie,Yixuan Zhai,Yijie Zeng,Jingyan Kang,Geng Cheng,Xiaodong Zhang
Due to the uncontrolled synthesis of layered double hydroxides (LDHs), a simple and efficient strategy was needed to construct high-performance LDHs. Herein, Co-Mn-ZIF was used as the sacrificial template to form cobalt-manganese-nickel LDH (M−Co−Mn−Ni LDH) through the process of deconstruction and reconstruction. Due to the sufficient in-situ etching of the Co-Mn-ZIF template, M−Co−Mn−Ni LDH exhibited a larger specific surface area (482.4 m 2 /g) and pore volume (3.3 × 10 −2 cm 3 /g) as well as easier diffusion and interaction with reaction sites of organic molecules. The prepared M−Co−Mn−Ni LDH showed high catalytic performance for the degradation of enrofloxacin (ENR) by activating peroxymonosulfate (PMS), with the removal rate of 88.5 % within 30 min. The quenching reaction and electron paramagnetic resonance (EPR) analysis results indicated that SO 4 •− and 1 O 2 were main active substances in the oxidation process of ENR. In addition, the Co-Mn-Ni LDH/PMS system was stable and almost unaffected by pH values, organic and inorganic substances, and it could achieve high removal efficiency in various pollutant samples. This work provided a convenient and efficient approach for the construction of high-performance MOFs derived LDHs catalysts.
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JOURNAL OF POROUS MATERIALS
·
2023
·
IF 2.6
Tang Yukuai,Chen Su,Liang Yusheng,Han Fengyan
We report a facile strategy to prepare the Pd nanoparticles loaded on porous N-doped carbon by direct carbonization of zeolitic imidazolate framework (ZIF-8) at 1000 o C. ZIF-8 not only serves as a precursor for N-doped carbon but also provides a framework to confine Pd nanoparticles with small size. The resulting Pd/ZIF-8(1000) has a regular morphology and excellent catalytic activity towards the reduction of nitrophenols (2-NP, 3-NP, and 4-NP) at room temperature with NaBH 4 as a reductant in aqueous solution. The enhanced performance is mainly due to N-doping, uniform dispersion and average size (2.3 nm) of Pd nanoparticles, large surface area, and synergistic effect between the metals (Pd NPs) and the support. Moreover, Pd/ZIF-8 (1000) remains the activity even after the 10th recycle experiment, indicating the catalyst has good stability. Importantly, ZIF-8(1000) can be applied as a framework to support highly uniform and stable noble metals with small size.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Ziying Zhong,Yun Tang,Yanran Chen,Chunfang Wang,Faqiong Zhao,Baizhao Zeng
The widespread use of tetracycline unavoidably causes residue problems, hence its monitor in foods and environment is important. In this work, a simple but sensitive electrochemiluminescence (ECL) sensor is prepared for tetracycline detection. The sensor is constructed using TiO 2 nanoparticle, ZIF-5 loaded Ru(bpy) 3 2+ (Ru@ZIF-5), and molecularly imprinted poly-o-phenylenediamine. The TiO 2 NP acts as a co-reaction accelerator for tri-n-propylamine (TPrA) by producing electrons and holes at a certain potential to promote the production of TPrA . ZIF-5 has a large specific surface area and rich functional groups, thus can well immobilize a large amount of illuminant Ru(bpy) 3 2+ . The electrodeposited molecularly imprinted polymer acts as a recognition element. Due to the synergic effect of different components, the resulting ECL sensor shows a wide linear range of 10 nM–50 μM, high selectivity, low detection limit, and good stability. It can be used for the detection of tetracycline in food and environmental samples.
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Analytical Methods
·
2023
·Vol. 15
·期 36
·4736-4743
·
IF 3.1
Wanyu Pang,Yali Gao,Tuoping Hu,Xuemei Ma
Rapid and accurate determination of luteolin is of great significance for pharmaceutical quality control. Herein, a disposable and sensitive luteolin sensor was fabricated by a hydrothermal method with carbon paper as substrate where ZIF-8 grew on GR in situ. Notably, the large specific surface area of ZIF-8 provided active sites on the electrode surface and the ability of GR to promote electron transfer greatly improved the sensitivity towards the oxidation of luteolin. Under the optimum conditions, the ZIF-8@GR/CP showed excellent detection performance for luteolin with a linear detection range of 0.04–3.2 μM and 3.2–120 μM, with LOD of 12 nM (S/N = 3). Furthermore, this disposable and sensitive sensor was successfully applied for the quantitative detection of luteolin in a capsule of Lamiophlomis rotata.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yingying Zhang,Xiaoci Cui,Xin Wang,Xiuyuan Feng,Yankang Deng,Weixia Cheng,Ranhua Xiong,Chaobo Huang
Currently, heavy metal such as Cu 2+ contaminants have posed a great threat for ecological security, and the discharge of sewage containing Cu 2+ into water and soil will cause damage to environment and even human health. At present, fluorescent solutions are generally used for Cu 2+ detection, but the they have defects such as easy leakage, difficult storage, poor photostability and inaccurate Cu 2+ detection. Herein, biomass solid-state fluorescence carbon fibers membrane detection platform ( NFE-CDs ) was firstly fabricated by encapsulating xylan carbon dots (CDs) into metal–organic framework ( MOF )( E-CDs @ZIF-8) using in situ growth methods and electrospinning technology. NFE-CDs was ued to improved response site of Cu 2+ by taking advantage of cooperative hybridization and electronic coupling effects. Owning its excellent fluorescence properties, NFE-CDs displayed excellent selectively for Cu 2+ based on ‘turn-on’ fluorescence response, ultra-short fluorescence response time (<1s) and detection limit (3.48 nM) that was well below U.S. EPA safety levels. The practical applications of NFE-CDs also exhibited high specificity for Cu 2+ detection in zebrafish and water samples (school lake, Xuanwu Lake and Yangtze River) with the recovery rates of 97%-112%. The developed fluorescence sensing platform was utilized to predict and detect water quality and safety by monitoring Cu 2+ change. This strategy demonstrates a promising biomass fluorescence platform for Cu 2+ detection for water treatment research and envrionment bioanalytical applications.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ping Dai,Yuchao Yao,Enzheng Hu,Dongyan Xu,Zhongcheng Li,Chuansheng Wang
In this work, a composite consisting of ZIF-67 and graphene oxide (GO) was successfully synthesized by a facile in-situ synthesis method and applied in hydrogen release from the methanolysis of sodium borohydride (NaBH 4 ). Physicochemical properties of pure ZIF-67 and the ZIF-67@GO composites are well characterized by XRD, BET, SEM and HRTEM. It was observed that the ZIF-67 crystals are intimately anchored on GO sheets. An increase of GO in the composite led to a marked decrease of the BET surface area and an increased average pore size. However, the ZIF-67@GO precursor with high GO doping exhibited much higher activity toward the methanolysis of NaBH 4 , which suggests that the good conductivity of GO is beneficial to improve the catalytic performance. The ZIF-67@GO precursor experienced a structure reconstruction during the methanolysis reaction due to the presence of reducible Co 2+ . Moreover, the reduced ZIF-67@GO displayed a slightly higher activity as compared to the pristine composite and retained excellent durability after five cycles. A possible mechanism for the hydrogen generation from the methanolysis of NaBH 4 using a ZIF-67@GO catalyst was proposed.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 26
·9088-9102
·
IF 4.39
Bei Xue,Yao Guo,Zhaofeng Huang,Shengyue Gu,Qian Zhou,Wei Yang,Kezhi Li
In this study, a novel NixCo3−xO4 nanotube array hierarchical structure derived from zeolitic imidazolate frameworks (ZIFs) is grown on Ni foam (NixCo3−xO4 NAHS/Ni foam) using the template-assisted and self-assembly approach for a high-performance hybrid energy storage device in alkaline solution. The material characteristics of the resultant samples were characterized by XPS, XRD, ICP, SEM, TEM and BET. Due to the unique hollow structure with a large specific surface area and the exposure of large active sites originating from ZIFs, the optimal NixCo3−xO4 NAHS/Ni foam exhibits substantially enhanced electrochemical properties. The NixCo3−xO4 NAHS/Ni foam directly acts as an electrode, which provides an excellent specific capacity of 290.48 mA h g−1 at 1 A g−1. Subsequently, the corresponding hybrid alkaline batteries that consist of NixCo3−xO4 NAHS/Ni foam and carbon materials display a highly satisfactory specific capacity of 54.94 mA h g−1 at 1 A g−1, a satisfactory long-term stability of 85.47% after 2000 cycles, a maximum energy density of 43.95 W h kg−1 and a power density of 8000 W kg−1. This work combines the design of the electronic structure with the optimization of composition, and provides a reference for the application of hybrid rechargeable alkaline batteries (RABs).
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Jun Wang,Sirong Yu,Xiaoli Yin,Liyuan Wang,Guang Zhu,Kang Wang,Quan Li,Jing Li,Xizhen Yang
Inspired by the “lotus effect’’, more and more attention has been paid to the water repellent and self-cleaning surface. Due to its excellent properties, Mg alloy is considered to be one of the most promising engineering materials so far. However, the humid and corrosive environment makes Mg alloy susceptible to corrosion, which greatly limits its wide application. So it is very necessary to improve the properties of Mg alloy through surface treatment. Because of good chemical stability, thermostability and easy preparation, Zeolitic Imidazolate Frameworks (ZIFs) materials have been applied in the field of superhydrophobicity. In addition, in-situ growth has advantages of simple method, convenient operation and no need for expensive experimental equipment. Therefore, in this work, the superhydrophobic coating with cross-like Zeolitic Imidazolate Framework-L (ZIF-L) structure is fabricated on Mg alloy surface via a simple in-situ growth and low energy modification. The superhydrophobic ZIF-L coating on the Mg alloy substrate has excellent water repellency and self-cleaning property, and the stability test results show that it has good performance in thermostability and durability. Besides, the coating keeps superhydrophobic state after being immersed in an alkaline solution for 112 h, showing excellent resistance to alkaline solution. Therefore, the superhydrophobic coating prepared in this work can expand the application of Mg alloy in different service environments and provide a novel way for Mg alloy applying into more fields.
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CELLULOSE
·
2021
·Vol. 28
·期 11
·7389-7404
·
IF 5.044
Xu Jiangtao,Shang Songmin,Gao Wei,Zeng Ping,Jiang Shouxiang
Although strategies of compositing noble materials and Zeolitic imidazolate frameworks (ZIFs) have been used to enhance the performance of ZIF-based surface-enhanced Raman scattering (SERS) substrates, the enhancement process still remains unclear and the sampling process with powder-form substrates is challenging for practical applications. In this study, a flexible SERS substrate with silver (Ag) nanoparticle decorated ZIF-67 as the active materials and cotton fabric as the supporting framework is developed with a facile method in two steps. The proposed flexible SERS substrate not only can reduce difficulties during the sampling process, but also expands future applications for sampling towards irregular target substances. Meanwhile, the enhancement mechanism has been investigated by using Methylene Blue to probe the molecular interactions. The constructed SERS substrate shows the highest enhancement factor of 6.25 × 10 6 and an excellent detection sensitivity with a limitation of detection (LoD) of 10 –14 M/L. Because of its excellent performance in SERS tracing, the proposed SERS substrate shows exceptional ability in detecting and identifying phenol-soluble modulins and is considered to be a label-free approach that requires no adding markers/tags or antibodies. The proposed substrate expands the potential applications of SERS technology for rapid detection of bacterial toxins during clinical diagnoses and treatment. Graphic abstract Ag decorated ZIF-67 particles are anchored onto cotton fabric to fabricate flexible SERS substrates. The proposed flexible SERS substrate achieves high SERS activity with high enhancement factor, low LoD, good reproducibility and stability. The flexible SERS substrate shows great potential in detection and identification of Phenol-soluble modulin.
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