PROGRESS IN ORGANIC COATINGS
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2023
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IF 6.6
Nanqi Shi,Haiyan Li,Xin Li,Hongxin Luo,Jiaying Jin,Jiayu Wang,Shuang Li
Two-dimensional hexagonal boron nitride (h-BN) has excellent corrosion resistance and barrier ability, showing unique advantages in the field of anti-corrosion. The h-BN was assembled with Zeolite imidazolate framework material (ZIF-8) and benzimidazole (BI), and an active filler (h-BN/ZIF-8@BI) with shielding and active corrosion resistance was prepared. Zeolite imidazolate framework material was in-situ grown on h-BN surface and loaded with benzimidazole (BI), prepared an active anticorrosive filler with high shielding property (h-BN/ZIF-8@BI). The microstructure, crystal form, element composition, corrosion inhibition ability and thermal stability of h-BN/ZIF-8@BI were studied. The barrier, corrosion inhibition and anti-friction properties of EP/h-BN/ZIF-8@BI combined with F51 epoxy resin were explored. EIS test shows that the corrosion inhibition efficiency of h-BN/ZIF-8@BI is as high as 81.8 %. The impedance modulus of the steel matrix protected by the composite coating was about 2 orders of magnitude higher than that of the control sample, showing excellent barrier ability. In addition, the salt spray test proves that the composite coating has excellent corrosion inhibition characteristics. Taber testing machine shows that the wear mass loss of EP/h-BN/ZIF-8@BI coating is 34.5 % lower than that of EP coating. This work provides a novel idea for the preparation of high barrier, active anticorrosive and wear resistant anticorrosive coatings, and provides a new horizon of the composite coatings.
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ACS Applied Nano Materials
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2023
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IF 5.9
Linlin Qian,Canxiang Fang,Yanghai Gui,Kuan Tian,Huishi Guo,Dongjie Guo,Xiang Guo,Peng Liu
NO2 is a very dangerous and toxic gas and is prone to cause acid rain in high humidity environments, so it is essential to prepare a real-time monitoring and humidity immunity NO2 sensor. WO3 nanomaterials are commonly applied to detect NO2, but their poor immunity to humidity is still a critical limitation for the application. ZnO-nanorod-decorated WO3 nanosheets coated with ZIF-71 (ZnO@ZIF-71/WO3) composites prepared by an in situ growth method displayed excellent gas sensing performance and good humidity immunity to detect NO2. Compared to WO3 nanosheets and ZnO-nanorod-decorated WO3 nanosheets (ZnO/WO3) heterojunction composites grown on ceramic substrates in situ, ZnO@ZIF-71/WO3 presented excellent selectivity, good long-term stability, and a remarkably high response of about 947.96 to 100 ppm NO2 at 180 °C, which is 3.07 times higher than that of the ZnO/WO3 sensor and 4.59 times higher than that of the pure WO3 sensor. Even at a relative humidity of 85%, the response of ZnO@ZIF-71/WO3 to NO2 remained essentially constant. The functional ZIF-71 layer not only improved the humidity immunity of ZnO@ZIF-71/WO3 but also enhanced the sensitivity and selectivity performance to NO2 at low operating temperatures. The ZnO@ZIF-71/WO3 sensor still provided a response of 88.41 to 100 ppm NO2 at room temperature.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Jinxiao Ba,Wei Cai,Yifan Chen,Li Lin,Yule Huang,Xianghai Yu,Yihua Wang,Chengqun Xu,Donghua Fan,Lisong Yin
In this work, pure and homogeneous Ni incorporated CdS photocatalyst was prepared by vulcanization of ZIF material synthesized from Cd/Ni salt by solvothermal method . The prepared pure CdS photocatalysts by the vulcanization of ZIF material exhibits better catalytic activity due to its larger specific surface area. The introduction of Ni can further improve the hydrogen production activity. The effect of Ni incorporating amount and annealing temperature on the hydrogen production activity of CdS photocatalyst was researched systematically. The photocatalytic activity at 10 % Ni incorporated CdS sample is greatly enhanced after annealing at 700 °C, which is attributed to the effective doping of Ni into the CdS lattice by annealing. The average hydrogen evolution rate is 1644.6 μmol/g/h, which adds up to about 119 times that of normal CdS. The current research provides a simple and effective method for improving the photocatalytic activity of CdS.
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NEW JOURNAL OF CHEMISTRY
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2023
·Vol. 48
·期 4
·1642-1649
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IF 3.3
Xurong Zuo,Pengfei Liu,Qinhao Sun,Jiahui Huang,Yuwei Zhang,Xuecheng Zhu,Runqi Chen,Xiangyu Meng
Because anthrax spores are highly lethal to humans and animals as well as potential biological warfare agents, there is a great need for rapid, sensitive, and selective quantification of dipicolinic acid (DPA) as a biomarker for anthrax spores. Herein, we prepared a novel lanthanide-doped nanoprobe by coordination of Tb3+ ions with tannic acid (TA)-coated zeolitic imidazolate frameworks-8 (ZIF-8) (ZIF-8@Tb–TA). The proposed assay was derived from the unsaturated coordination of Tb3+ ions. In the presence of DPA, Tb3+ ions could be sensitized to emit inherent luminescence due to the energy transfer after coordination with DPA. The results illustrated that ZIF-8@Tb–TA could be used as a sensitive nanoprobe for detecting DPA with a broad linear range (0 μM to 12.0 μM), and the limit of detection (LOD) was 12.3 nM. Moreover, the specific recognition ability of DPA by ZIF-8@Tb–TA was much better than that of other interfering molecules. This study proposed a new strategy to establish lanthanide-functionalized nanoprobes for highly selective and sensitive detection of DPA.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Juan Wang,Feilong Yin,Wenjing Tang,Nini Zhang,Liang Li,Shengbiao Zheng,Jing Tang,Jiahao Guo
The combination of metal organic framework (MOFs) with metal nanoparticles has great prospects for improving the electrochemical property of sensors. In this paper, silver (Ag) nanoparticles doping Co-based zeolitic imidazolate framework ( ZIF-67) composites (Ag-ZIF-67) were prepared by ultrasonic treatment of ZIF-67 and reduction of metal precursor (AgNO 3 ) in ZIF-67 material. Ag-ZIF-67 nanosheet material was obtained and characterized by transmission electron microscopy and electrochemical impedance spectroscopy. Due to the synergistic effect of high porosity and large specific surface area of ZIF-67, as well as the high electrical conductivity and prominent catalytic activity of Ag nanoparticles, Ag-ZIF-67 modified glassy carbon electrode showed excellent electrocatalytic activity for the detection of acetaminophen (AP) and caffeine (CAFF), including wide linear range (0.1–70.0 μM) for AP and (0.5–300.0 μM) for CAFF, high anti-interference ability. Additionally, the prepared Ag-ZIF-67 sensor also exhibited excellent selectivity for two compounds detection and prospective results in pharmaceutical formulations samples.
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International Journal of Electrochemical Science
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2023
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IF 1.5
Meng Jiang,Lin Zhu,Zejun Zhang,Yijing Ai,Lina Zeng,Shuhai He,Lin Li,Wei Sun
In this article the ZIF-8 based metal-organic frameworks-derived porous carbon was mixed with aminated graphene to obtain the nanocomposite, which was used to modify the surface of glassy carbon electrode (GCE). SEM, XRD and FT-IR were used to characterize the nanocomposite, which exhibited the unique morphology with functional groups. The modified electrode was applied to the electrochemical detection of rutin. Compared with that of GCE, the current response of rutin increased obviously on the modified electrode. Square wave voltammetry was further applied to quantitative analysis of rutin with a linear relationship between the concentration and peak current in two sections from 0.25 to 0.7 μmol·L -1 and 0.7 to 1.5 μmol·L -1 with detection limit of 15 nmol∙L -1 . Consequently, the detection of real samples was realized by this method.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Shuhao Xu,Qijin Tang,Shudi Li,Tengfei Liao,Huajing Cheng,Tong Lu,Nan Jiang,Zhong Lu,Cailong Zhou,Hao Yang
Bacteria and oils can be found in domestic sewage and wastewater from biomedical industries, however, traditional membranes have limitation in bacterial resistance, so it is high demand to design oil-water separation membranes with antibacterial activity. In this work, a novel TCN-ZIF-67/PVA@NM composite membrane with underwater superoleophobic property was prepared by in-situ growth method. The effects of ZIF-67 on emulsion separation and antibacterial activity were investigated in details. Results show that TCN-ZIF-67/PVA@NM have high separation efficiencies for oil-in-water emulsions stabilized by SDS, CTAB or Tween 80. Due to the positive charge of ZIF-67, the separation flux shows a trend of SDS>CTAB>Tween 80. The separation efficiency and antibacterial activity of the composite membrane increased and the separation flux decreased with the increase of the particle size of ZIF-67. In addition, the composite membrane had good inhibitory effects against the biofilm formation of S. aureus and MASR . It was found that when the reaction time was more than 6 h, the separation efficiencies of oil-in-water emulsions were more than 99%, and the bacterial inhibition ratios against S. aureus and E. coli . and biofilm inhibition ratios against S. aureus and MASR were more than 90%. When separating the emulsion containing bacteria, the composite membrane can simultaneously purify the emulsion and kill the bacteria in the water. Overall, ZIF-67 plays key roles in both emulsion separation and bacterial resistance, and the ZIF-67 composite membrane shows a promising potential in oil-water emulsion separation application.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Yaoxuan Li,Lihang Yan,Guanhua Liu,Huaxun Chen,Hao Zhao,Lihui Wang,Jing Gao,Yunting Liu,Xiaobing Zheng,Yanjun Jiang
Carbon capture, utilization and storage have become a hot topic in recent years, and enzymatic CO 2 reduction benefits from high selectivity, high efficiency and mild conditions making it promising. However, the low solubility of CO 2 , poor stability of free enzyme and high cost of coenzyme limit the application. Therefore, mesoporous silica nanoflower (SNF) was used to immobilize formate dehydrogenase (FDH) by electrostatic adsorption followed by the coating of a multifunctional zeolitic imidazolate framework (ZIF-8) layer by sequential coating of Zn 2+ and 2-methylimidazole (2-MeIm), thus obtaining a novel integrated nanocatalyst ZIF-8@FDH@SNF. Regulated by controlling the ratio of ligands, the ZIF-8 coating layer not only protected the enzyme and prevented leakage, but also increased the local CO 2 concentration using the imidazole group of ZIF-8 which improved the CO 2 adsorption by 34.5% compared with SNF. And the expensive NADH was regenerated by the coupled electrocatalysis. The optimized integrated nanocatalyst showed excellent stability and reusability. Highly efficient electroenzymatic CO 2 reduction was achieved with 1.38 mM formate yield after 3 h, 48.4% higher than that without ZIF-8 layer.
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CATALYSIS COMMUNICATIONS
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2023
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IF 3.7
Shubo Sun,Haihan Yu,Mingzhi Hua,Lina Zhang,Chaomin Gao,Xin Cheng
Promoting the effective separation of photo-generated charge carriers is vitally crucial to enhancing the photocatalytic performance. The piezo-phototronic effect, which could regulate the directional migration of photogenerated carriers, has been regarded as an effective strategy of separating carriers. Herein, the NaNbO 3 @ZIF-8 which possesses efficient carrier separation property is prepared to achieve significant increase of H 2 evolution rate (1.16 mmol g −1 h −1 ) under the coupling effects of ultrasonic vibration and light irradiation, which is 1.9 times than that of NaNbO 3 . This work provides a strategy for studying the promotion of carrier separation and promoting photocatalytic performance under an external field.
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JOURNAL OF SOLID STATE CHEMISTRY
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2023
·
IF 3.3
Bowen Dong,Yuqi Wan,Dan You,Qingrong Cheng,Zhiquan Pan
In order to alleviate the problem of water resource pollution, the exploration of visible-light driven excellent photocatalysts is an important issue for worldwide sustainable green energy systems. In this work, a novel binary hybrid nanocomposite WO 3 /Mn-ZIF-67 heterojunction photocatalyst was prepared through simple template method. It was based on the particular structure and performance of metal-organic framework (MOFs), and the structure of the heterojunction photocatalyst was expressed by SEM, TEM , FT-IR, DRS , XPS , PXRD and EIS . The novel WO 3 /Mn-ZIF-67 heterostructure showed more efficient photocatalytic properties for Tetracycline (TC) decomposition and hydrogen production than that of WO 3 monomer and Mn-ZIF-67 monomer under simulated light, respectively. Owing to the active radical catch and ESR experiments, a rational solid-state Z-model electron migration theory was rendered. Z-model mechanism can neatly be obligated to the raised degradative capacity of the photocatalytic reaction. The wonderful high-efficiency photocatalytic decomposability of heterojunction was mainly due to: (i) the WO 3 structure improved dramatically the light absorption efficiency of the photocatalyst. (ii) the doped Mn enhanced the photoelectric properties of ZIF-67. (iii) contact with the close interface between WO 3 and Mn-ZIF-67 produced efficient charge separation and migration.
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ACS Applied Nano Materials
·
2023
·
IF 5.9
Le He,Gang Ding,Sasha You,Si Lu,Xianfeng Huang,Ling Li,Xiaolan Yu
Nanozymes that mimic the catalytic reaction of natural enzymes show great prospects for tumor catalytic therapy because they possess the properties of nanomaterials and natural enzymes. However, the therapeutic effect of nanozymes is restricted by the low catalytic efficiency and specific oxidation–reduction systems in the tumor microenvironment (TME), such as overexpressed glutathione (GSH) level. In order to improve the catalytic efficiency, a multifunctional nanozyme, Cu/zeolitic imidazolate framework-67 (ZIF-67)/Prussian blue (PB), was designed through the modification of Prussian blue (PB) on the surface of the copper-doped zeolitic imidazolate framework, which can be used for imaging-guided synergistic therapy with photothermal-enhanced multienzyme-like catalytic therapy and chemotherapy. The doping of Cu2+ provided better glutathione oxidase-like (GPx-like) activity and peroxidase-like (POD-like) activity to deplete GSH and increase the generation of •OH in TME. The modification of PB provided better catalase-like activity (CAT-like) to promote the production of O2 and enhance the multienzyme-like catalytic therapy. In vivo experiments showed a satisfactory anticancer effect. This work thus provided a strategy for designing a type of multifunctional nanozyme for imaging-guided combination therapy.
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huimin Yang,Xin Liu,Jihui Wang,Wenbin Hu
The following study is conducted to improve the corrosion resistance of magnesium alloy. First, ZnAl layered double hydroxide (ZnAl LDH) film was prepared on AZ61 magnesium alloy by using hydrothermal method. Then, as-prepared ZnAl LDH was put into 2-methylimidazole (2-mIm) solution to synthetize ZIF-8 film (ZIF-8/LDH). Finally, ZIF-8/LDH film synthesized ZIF-8-DMBIM film (ZIF-8-DMBIM/LDHs) via a shell-ligand-exchange-reaction in the methanol solution containing 5, 6-dimethylbenzimidazole (DMBIM). The surface morphology, structure, and composition of the composite film were observed and determined by scanning electronic microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and energy-dispersive X-ray spectroscopy. The wettability of composite film was measured by using a water contact angle meter, and the corrosion resistance of the composite film was estimated by the polarization curve and electrochemical impedance spectroscopy techniques. Results show that the prepared ZIF-8-DMBIM/LDH composite film has a dense hexagonal plate morphology with a two-layer structure and a thickness of 3.5 μm. Compared with ZnAl LDH and ZIF-8/LDH films, ZIF-8-DMBIM/LDH composite film has a high contact angle (115.7°), low corrosion current density, and high corrosion potential and polarization resistance due to its near-smooth surface, dense two-layer structure, and hydrophobic characters.
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