SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Haoji Jiang,Wenxiong Shi,Qiang Liu,Heyun Wang,Jialu Li,Chunlin Wu,Yingchun Li,Zhong Wei
In order to investigate the effects of MOFs by altering ligands with various functional groups on separation selection in pervaporation dehydration, three hydrophilic UiO-66-X nanoparticles were respectively synthesized and blended into poly (vinyl alcohol) matrix to fabricate water-selective membrane for ethanol dehydration via PV technology. Both the experimental and molecular simulation results confirmed the UiO-66-X counterbalancing factors of enhanced polarity and suitable pore size gave rise to the optimal performance in ethanol dehydration. The PV performances could be tuned by the type and quantity of functional groups carried by UiO-66-X nanoparticles. As a result, the pore aperture of UiO-66-(COOH) 2 nanoparticles provided continuous channel for water diffusion, and water molecules could also be activated attributed to the strong interaction between the UiO-66-(COOH) 2 nanoparticles and water molecules which enhanced the penetration and diffusion of water molecular in hybrid membrane to increase the water flux. The optimized hybrid membranes with UiO-66-(COOH) 2 loading of 8 wt% exhibited the total flux of 979 ± 7 g/(m 2 ·h) and a separation factor of 2084 ± 21.
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FUEL PROCESSING TECHNOLOGY
·
2020
·
IF 4.982
Cheng Wang,Ai-Rong Li,Yu-Ling Ma
The synthesis of highly efficient and stable catalysts for oxidative desulfurization is still a challenging task. Herein, a composite material (HPMo@UiO-66) of phosphomolybdic acid (HPMo) encapsulated in the metal-organic framework UiO-66 with missing-linker defects was prepared via a one-pot hydrothermal method . A series of as-synthesized catalysts were systematically characterized by XRD , FT-IR, SEM , BET, TGA , XPS , UV–vis and PL . Through oxidative desulfurization experimental evaluations, the catalyst 0.5-HPMo@UiO-66-D with defects shows the superior catalytic oxidative desulfurization performance and high reusability . 0.5-HPMo@UiO-66-D is able to completely remove DBT in the model fuel in 60 min, and the reaction system can be recycled 10 times with a high activity. In addition, the kinetics and the activation energy of the oxidative desulfurization were studied.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Yawen Wu,Xiaolong Chen,Xiaogang Luo,Mei Yang,Changjun Hou,Danqun Huo
Carcinoembryonic antigen (CEA) is a key serum tumor marker which is overexpressed in all types of adenocarcinomas. Therefore, establish the ultrasensitive, accurate and rapid method for CEA detection is essential for reducing the mortality of cancer. Here, a bimetallic organic framework Cu/UiO-66 was synthesized through the simple two-step hydrothermal method and used to construct a “fluorescence turn-on” analytical method for CEA detection. Cu/UiO-66 can adsorb CEA aptamers modified with FAM (CEA/FAM-Apt) and take place photoinduced electron transfer (PET) between Cu/UiO-66 and FAM, resulting in the fluorescence of the FAM is quenched. When CEA is present, CEA and CEA/FAM-Apt are tightly combined, making CEA/FAM-Apt far away from the Cu/UiO-66 surface. As a result, the fluorescence intensity of the system was significantly restored. Under optimal conditions, the proposed “fluorescence turn-on” method can detect CEA as low as 0.01 ng mL −1 in a range of 0.01–0.3 ng mL −1 . Besides, this analytical method owns good selectivity , reproducibility and serum applicability, which provides a new platform for the direct detection of clinical diagnosis-related markers.
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PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2021
·
IF 4.821
Mingying Ma,Tianhao Wu,Zhian Hu,Gongwei Sun,Sichun Zhang
High-throughput sample preparation is important in clinical mass spectrometry (MS) analysis. In this work, we developed a method by coupling Nano-ESI-MS with magnetic SPE using a MOF material, Fe 3 O 4 @UiO-66, as sorbent for simultaneous determination of testosterone (T) and androstenedione (4-AD) in serum samples. The proposed method presented good linearity in the range of 0.1–5 μg/L and the recoveries of serum samples were 90.7%-110.0% and 101.7%-108.7% for T and 4-AD, respectively. The results indicated that the Fe 3 O 4 @UiO-66 is an ideal sorbent for androgens extraction and the method is reliable for high-throughput quantitation of T and 4-AD in clinical applications.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Yingqing Zhan,Shuangjiang He,Jiaxin Hu,Shumei Zhao,Guangyong Zeng,Mi Zhou,Guiyuan Zhang,Arijit Sengupta
Super-wetting MOFs@graphene hybrid has shown promising application for oil/water separation, due to high porosity, low density, and controllable wettability, however, achieving excellent stability and recyclability are found to be still challenging. In this study, sandwich-like UIO-66-F 4 @rGO hybrid was synthesized by immobilization of UIO-66-F 4 nanoparticles on rGO matrix, which featured the unique micro/nano hierarchy with hydrophobic characteristics. In order to realize the oil/water separation, as-prepared sandwich-like UIO-66-F 4 @rGO hybrid was applied as a potential candidate for constructing robust super-hydrophobic/super-oleophilic interfaces by using filter paper (FP) and melamine sponge (MS) as substrates. Typically, the surface modification of substrates can be easily achieved by simple dip-coating method, and interfacial adhesion between substrates and UIO-66-F 4 @rGO was enhanced by cross-linking of hydroxyl-fluoropolysiloxane (FPSO). Consequently, the super-hydrophobic/oleophilic UIO-66-F 4 @rGO/FP exhibited high contact angle of 169.3 ± 0.6° and was capable of separating various water-in-oil emulsions effectively. The flux and separation efficiency were 990.45 ± 36.28 Lm −2 h −1 and 99.73 ± 0.19 % driven by gravity, respectively. The super-hydrophobic/super-oleophilic UIO-66-F 4 @rGO/MS possessed selective oil absorption with absorption capacity of 26∼61 g/g depending on the viscosity of oils and continuous cleaning of oil spill. Furthermore, the UIO-66-F 4 @rGO composite could tolerate high/low temperature, corrosive solutions, and physical damage, displaying robust and stable super-hydrophobic/super-oleophilic interfaces for treating oily wastewater in harsh environments.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 12
·B873
·
IF 3.12
Xiaoyu Zhao,Wenlong Bai,Yujia Yan,Yanfei Wang,Juankun Zhang
Cadmium ions have variable degrees of toxicity on the environment and organisms. An electrochemical sensor based on self-doped polyaniline (SPAN) modified Metal-organic Framework (SPAN@UIO-66-NH2) with high electron mobility was developed. Cyclic voltammetry and electrochemical impedance spectroscopy indicated that doping of SPAN enhanced the electron transfer rate of UIO-66-NH2 in SPAN@UIO-66-NH2. The optimized Cd2+ sensor exhibited good linear response from 0.5 μg L−1 to 100 μg L−1, low detection limit of 0.17 μg L−1 (based on S/N = 3), good stability, and fast response time. It showed decent reliability for detection of trace Cd2+ in natural lake and urine samples.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2018
·Vol. 135
·期 46
·46759
·
IF 1.901
Mingmin Jia,Yi Feng,Jianhao Qiu,Xiaocheng Lin,Jianfeng Yao
UiO-66-NH 2 nanocrystals were synthesized and embedded into bromomethylated poly(phenylene oxide)/polyethersulfone (BPPO/PES) polymer matrix to form UiO-66-NH 2 /BPPO/PES mixed matrix membranes (MMMs). The crystalline structure, interaction between UiO-66-NH 2 and BPPO, and dispersion of UiO-66-NH 2 were characterized by FTIR, XRD, and SEM. Nanoparticle dispersion was drastically enhanced with the assistance of BPPO, giving an improved adhesion between the polymer and filler particles. Owing to the intrinsic adsorption property of UiO-66-NH 2 and BPPO to CO 2 , the CO 2 permeability was significantly increased. As a result, the UiO-66-NH 2 /BPPO/PES membrane exhibited enhanced gas separation performance, where CO 2 /N 2 and H 2 /N 2 ideal selectivities were increased to 50.2 and 302.4 with a CO 2 permeability of 125.6 Barrer. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 46759.
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CRYSTENGCOMM
·
2015
·Vol. 17
·期 33
·6434-6440
·
IF 4.034
Yitong Han,Min Liu,Keyan Li,Yi Zuo,Yingxu Wei,Shutao Xu,Guoliang Zhang,Chunshan Song,Zongchao Zhang,Xinwen Guo
UiO-66 with crystal size ranging from hundreds of nanometers to a few micrometers and with cubic and cuboctahedral morphologies were synthesized. Crystal size and morphology varied with the additive amount of hydrofluoric acid and the concentration of reactants (ZrCl4 and H2BDC) during solvothermal synthesis. According to energy dispersive spectrometry (EDS) and 19F MAS NMR measurements, the fluorine ions directly bonded to Zr in the SBUs (secondary building units) in the MOF framework due to their strongest electronegativity. The bonding of the fluorine ions and Zr not only compensated for the charge imbalance of the framework caused by missing linkers but also competed with the linkers to coordinate with the Zr metal centers, thereby controlling the processes of nucleation and growth of the UiO-66 crystals. The samples were further characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), Fourier transform-infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA) and Ar sorption isotherms, showing that the introduction of fluorine enhanced the thermostability and porosity of UiO-66.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaoyu Mao,Changhua Li,Xiaofeng Zhang,Hao Chen,Chao Zhang,Rui Gou,Yi He
In this study, we developed a composite material comprising UIO-66-NH 2 encapsulated tannic acid (TA) loaded on Ti 3 C 2 Tx to improve the corrosion resistance of water borne epoxy (WEP) coatings. The successful synthesis of the material was determined by FT-IR, XRD, XPS, EDS, TGA, SEM and TEM characterization. Furthermore, ultraviolet (UV)tests were conducted to evaluate the release rate of TA at varying pH levels, revealing a release rate of approximately 95 % at pH 2. Electrochemical impedance spectroscopy (EIS) results over 60 d indicated that the R c value of TU-T/WEP remained unchanged at 3.934 × 10 8 , demonstrating a two-order magnitude increase compared to those of pure epoxy coatings, attributed to the synergistic active and passive protection of TU-T materials. The self-healing ability of the TU-T/WEP coating was validated through manual scratch experiments. Additionally, the EIS test showed that the R c value of TU-T/WEP coating increased to 3.5 × 10 5 after 72 h, representing a two-order magnitude increase over that of the WEP coating alone. This study introduces a novel approach using green tannic acid as a corrosion inhibitor and amino-functionalized Ti 3 C 2 Tx with UIO-66-NH 2 to enhance corrosion resistance and self-healing aproperties of coatings.
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JOURNAL OF MOLECULAR LIQUIDS
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2024
·
IF 5.3
Jiawei Zheng,Xiaoyi Zhang,Zhuowa Li,Nanjing Zhong
Immobilization of acid ionic liquid (AIL) for heterogeneous catalysis is benificial for products separation and recycling the AIL for continuing reuse. In this study, AIL was grafted onto the amino group functionalized zirconium-based metal organic framework (NH 2 -UiO-66) to catalyze esterification for short chain fatty acid glycerides synthesis. AIL of 1-(4-Sulfobutyl)-3-Methylimidazolium Hydrogen Sulfate ([HSO 3 -BMIM][HSO 4 ]) was found suitable for short chain fatty acid glycerides after screening varied fatty acids with chain length from 4 to 18. [HSO 3 -BMIM][HSO 4 ] was therefore grafted and butyric acid glyceride was synthesized. Reaction conditions were optimized by means of single factor study and orthogonal experiment. The reusability of the AIL@NH 2 -UiO-66 was evaluated. The AIL@NH 2 -UiO-66 showed good esterificaiton performance and fine reusability. Butyric acid conversion (converted into the glycerides of mono-, di- and tributyrin) at 62.16% was obtained under the optimum conditions. In addition, the present AIL@NH 2 -UiO-66 was quite stable, and 67.39% of its initial esterification activity was retained after 11 cycles of reuse, suggesting it was potential in the esterification reaction.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuanyuan Cui,Jianmin Sun
Developing a highly efficient catalyst for the conversion of CO 2 into cyclic carbonate is crucial for achieving carbon neutrality. Incorporating target-specific active sites into solid catalysts represents a novel and promising strategy for enhancing the chemical conversion of CO 2 . In this study, the original UiO-66-NH 2 was post-synthetically modified by replacing the H atom of –NH 2 functional group in UiO-66-NH 2 with the Br group in 1-bromobutylimidazole (BIm) under alkaline conditions. Subsequently, the imidazole group in UiO-66-NH 2 -BIm was quaternized with bromoalkyls (including 3-bromopropionic acid, 2-bromoethanol, and 2-bromoethylamine hydrobromide), resulting in the synthesis of UiO-66-NH 2 modified by ionic liquids (ILs) containing hydrogen bond donors, denoted as IL-R@UiO-66-NH 2 (where R OH, NH 2 , COOH). The catalytic performance was assessed in the absence of cocatalyst and solvent at 100 °C, 5 h and 1.0 MPa CO 2 . Notably, IL-COOH@UiO-66-NH 2 exhibited the highest catalytic performance, achieving propylene carbonate yield of 96.1 %. This outstanding performance was attributed to the synergistic interactions between the Lewis acidity of the MOF node, the strong nucleophilicity provided by the Br − of the IL, and the hydrogen bonding interaction facilitated by the carboxyl group, Lewis basic N site from the IL cation. Additionally, IL-COOH@UiO-66-NH 2 demonstrated compatibility with a wide range of epoxy substrates and exhibited good recyclability.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yuanyuan Cui,Jianmin Sun
The direct oxidative carboxylation of olefins and CO 2 to synthesize cyclic carbonates involves a tandem process of epoxidation and CO 2 cycloaddition reactions. However, designing a multifunctional catalyst for this reaction remains challenging. Herein, a composite catalyst ImBr@UiO-66-Br(Co) was synthesized by post-metallization of Co 2+ and subsequent functionalization with an imidazole ionic liquid (IL), which was used effectively for this reaction. The effects of temperature, CO 2 pressure, catalyst dosage, and reaction time on the direct oxidative carboxylation of olefins to cyclic carbonates were investigated. The results showed that ImBr@UiO-66-Br(Co) exhibited optimal performance in the solvent-free reaction system with styrene (3 mmol), tert -butyl hydroperoxide (6 mmol), and tetrabutylammonium bromide (TBAB, 50 mg) at 80 ℃ under 1 MPa CO 2 for 24 h, achieving a styrene conversion of 90.3 % and styrene carbonate selectivity of 80.7 %. The excellent catalytic activity of ImBr@UiO-66-Br(Co) was attributed to the synergistic interactions of the Lewis acidity Zr 4+ sites, the strong nucleophilicity provided by Br - , the weak base sites from tertiary amine and quaternary ammonium groups in imidazole IL, and the redox-active Co 2+ sites. Additionally, the catalyst was easy to separate and maintained stable activity and selectivity over at least five cycles. Finally, the potential catalytic mechanism for the direct oxidative carboxylation of olefins to cyclic carbonates was proposed.
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