Surfaces and Interfaces
·
2023
·
IF 6.2
Fan Xiao,Ming Cao,Yingbo Chen
The synthesis of ultra-thin, uniform and continuous polyamide (PA) membranes is a crucial prerequisite for enhancing their desalination performance. Research has indicated that effectively slowing down the interfacial polymerization (IP) reaction and promoting the interface stability are key strategies for achieving ultra-thin, uniformly nano-structured membranes with excellent performance. Herein, we have demonstrated the successful design of a continuous and uniform PA membrane, ranging from 10 to 20 nm, by utilizing the UiO-66-(OH) 2 n-hexane dispersion as a transition layer to regulate IP reaction and enable efficient water-salt separation. The results showed that the presence of the transition layer facilitated a bidirectional diffusion-contact reaction between the two monomers, resulting in improved interface stability and alleviating the occurrence of severe IP that may lead to heterogeneous membrane structures. As a result, the PA active layers formed through this approach exhibited superior thinness and uniformity compared to those produced via traditional IP methods. Moreover, the transition layer enabled uniform pre-polymerization of UiO-66-(OH) 2 at the reaction interface by pre-exposing it to down-diffusing acyl chloride monomers. This ensured the continuity of membrane structure while creating additional free volume within the membrane. This work presented a scalable method for manufacturing ultra-thin, defect-free, homogeneous, and high-performance nanofiltration membranes.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ming Cao,Fan Xiao,Zijian Yang,Yingbo Chen,Ligang Lin
Oil-containing emulsion pollution seriously endangers the ecological environment and human health, and it is urgent to solve the problem of oil-containing emulsion pollution. In membrane separation technology, metal organic frameworks (MOFs) are being widely used to enhance the wettability of the membrane surface and separation efficiency. Here, electrospinning technics and the outstanding wetting properties of MOF are combined to improve the separation performance of oil-containing emulsions. PVP chains were successfully grafted on Zr-O clusters of UiO-66-NH 2 to prepare PVP-UiO-66-NH 2 nanoparticles, which were then loaded on the PAN nanofiber substrate with microspheres/fine fibers prepared by a continuous electrospinning-electrospray process. The result shows that the PAN nanofiber substrate loaded with 0.5 wt% PVP-UiO-66-NH 2 has the best separation efficiency and stable anti-fouling ability for different kinds of oil-in-water surfactant stabilized emulsions (TOC = 11.6 mg/L, R = 99.2% FRR = 94.4% for n-hexane-water emulsion). Therefore, the constructed nanofiber membrane is the favorable candidate for the efficient separation of oil-containing emulsions.
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Liang Chu,Zhaokun Wang,Teng Zhao,Mu Yang,Ge Wang
Metal-organic frameworks (MOFs) as host-guest catalyst in oxidative desulfurization (ODS) face challenges due to limited access to active sites through their microporosity. Herein, hierarchical porous Ce-UiO-66 (HCU) was synthesized through a templating method in an aqueous environment to enhance host accessibility; phosphotungstic acid (PW) was uniformly loaded within the mesopores of HCU via post-impregnation; Ce sites were exposed by selective removing the coordinated acetate from the HCU with the acid post-treatment, these synergistically optimized the catalytic potential of the composite. The resulting HCU@5PW-H demonstrates outstanding desulfurization performance (1000 ppm sulfur removal) within 16 minutes under mild conditions (40 °C, O/S molar ratio = 5) and maintains high efficiency over at least eight cycles. The catalytic mechanism involves the decomposition of H 2 O 2 to reactive oxygen species (ROS) and the formation of W VI -peroxo intermediates that determine the ODS activity. This synergistic mechanism offers a promising strategy to enhance the oxidation potential of hierarchical porous MOF-based host-guest catalysts under mild conditions.
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ACS Applied Polymer Materials
·
2025
·
IF 4.7
Shanqiu Liu,Enze Yu,Wei Cui,Taotao Ge,Qing Liu,Yu Zhong,Ping Li,Jie Yu,Jingguo Li
Nanocellular polymer foams are highly valued for their light weight, high strength, and unique nanostructures, offering significant potential for diverse applications. However, their fabrication and practical use are constrained by the low cell nucleation efficiency and the necessity for extremely high-pressure foaming processes. In this work, we successfully fabricated polymethyl methacrylate (PMMA) nanocellular foam featuring a cell density on the order of 1013 cells cm–3 at a relatively low foaming pressure of 6.0 MPa. This accomplishment was achieved through the use of UiO-66-X nanoparticles as nucleation facilitators, which exhibited a high nucleation efficiency of 1.94. Four distinct UiO-66-X nanoparticles, each adorned with different functional groups, were synthesized and proven to act as efficacious nucleators for PMMA nanofoams. The successful synthesis of UiO-66-X nanoparticles and the integration of functional groups were corroborated through Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The cell dimensions and density of the PMMA nanocellual foam were characterized via SEM analyses. Our findings revealed that the incorporation of UiO-66-X nanoparticles dramatically minimized the cell size of the PMMA foam, thereby attaining an elevated cell density. This enhancement is attributed to a reduction in the free energy for cell nucleation within nanocavities situated at the matrix–nucleator interface. Consequently, the meticulous design of high-performance nucleating particles and the judicious selection of foam matrix constituents emerge as pivotal strategies in the quest for polymer cellular materials exhibiting nanoscale cell dimensions. These insights significantly advance the fabrication of polymer foams with enhanced thermal insulation properties and have broad implications for the realm of honeycomb materials science. By optimizing nucleation mechanisms and material combinations, this work paves the way for the development of advanced cellular polymers tailored for applications where superior insulation or light weight yet robust structures are paramount.
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CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Xiaoyu Yang,Zhen Li,Shaokun Tang
Hierarchically porous metal–organic frameworks (MOFs) not only inherit the merits of MOFs such as high porosity, but they also possess distinct properties such as a broader pore size range and thus more rapid mass transport. Simple, controllable synthesis of hollow or mesoporous structures with tailored pore features and more metal sites is desired and remains challenging. Herein, we demonstrate a facile strategy for fabricating hollow/mesoporous UiO-66 through a designed defect density and subsequent etching process. The strategy relies on the construction of an inhomogeneous nanoarchitecture in which the addition of water in UiO-66 synthesis can facilitate the formation of linker defects by promoting the explosive nucleation of UiO-66 and acetic acid deprotonation, and the more defective core will be selectively etched by sodium hydroxide. The morphology, size, pore structure, and metal sites can be exquisitely designed by rationally adjusting the water dosage and etching conditions. Markedly, UiO-66 with larger mesopores contributes to excellent glyphosate adsorption capacity, and the hollow UiO-66 catalyst with more active metal sites exhibits superior performance in the [3 + 3] cycloaddition reaction.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1839-1849
·
IF 3.146
Zhang Xiaoting,Zhang Shusheng,Ouyang Gangfeng,Han Runping
A zirconium-based metal organic framework (UiO-66-NH 2 ) was prepared using a greener approach for the removal of hexavalent chromium (Cr(VI)) from solution. The characterization of UiO-66-NH 2 was performed using several methods, and the influence of the solution pH, adsorbent dosage, salt, adsorption time, Cr(VI) concentration and adsorption temperature on adsorption quantity was performed in batch mode. UiO-66-NH 2 can efficiently remove Cr(VI) through the synergistic effect of adsorption and reduction. At pH solution of 1.1 and solid-to-liquid ratio of 2 g·L −1 , the removal rate of 100 mg·L −1 Cr(VI) increased to 95.2%. The maximum adsorption capacity of UiO-66-NH 2 from Langmuir model was 252 mg·g −1 . The adsorption equilibrium process can be well described by Langmuir, Koble-Corrigan and Temkin models, while the kinetic process can be predicted by pseudo-second-order and Elovich model. UiO-66-NH 2 showed a good adsorption capacity in a wide range of pH (pH=1.1–10) and also had better regeneration performance after five cycles using 0.01 mol·L −1 NaOH; consequently, it can be a promising adsorbent for the removal of Cr(VI) from solution.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yongchao Wang,Qing Yang,Fangli Yi,Ruowei Lu,Yanxia Chen,Cheng Liu,Xinyu Li,Cuijuan Wang,Hongjian Yan
The poor stability and low catalytic activity of NH2-UiO-66 in basic solutions require the reactions to be conducted in acidic solutions, which seriously hinders its potential photocatalytic application. Herein, we report that NH2-UiO-66 coated with two-dimensional covalent organic frameworks (COFs) via imine bond connection presents not only high photocatalytic activity but also high stability and adaptability to the solution environment. The NH2-UiO-66/COF hybrid material was fabricated through the Schiff base reaction of NH2-UiO-66 with 4,4′,4″-(1,3,5-triazine-2,4,6-triyl)trianiline (TAPT) and 2,4,6-triformylphloroglucinol (TP). The hybrid material showed high stability in an alkaline environment, with only 4.7% of NH2-UiO-66 decomposed after the photocatalytic reaction. The optimum photocatalytic H2 evolution rate was 8.44 mmol·h–1·g–1 when triethanolamine was used as an electron-donating agent. The results presented here illustrate the possibility for effectively improving both the photocatalytic performance and stability of NH2-UiO-66 by coupling with COFs.
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NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 34
·14389-14400
·
IF 3.288
Wenyi Yu,Qianwei Liang,Yuwei Yin,Junjie Geng,Wei Chen,Xuanyi Tan,Hanjin Luo
Arsenite (As(III)) is more toxic and more difficult to remove from water than arsenate (As(V)). A new nano core–shell-structured K-OMS-2@UiO-66 (K-OMS-2, formula KMn8O16·nH2O) was fabricated via a facile one-step oxidation–coprecipitation method for enhanced As(III) removal. Results showed that the maximal adsorption capacity of As(III) achieved was 180.10 mg g−1. The as-synthesized K-OMS-2@UiO-66 adsorbent functions excellently across a broad pH range of 1.5 to 10.0, and the residual concentrations of As(III) can drop under 10.0 μg L−1. Based on XPS and FTIR measurements, it is proposed that the removal mechanism was mainly controlled through a synergistic interaction of surface complexation and hydrogen bonding. As(III) was sorbed onto the surface of the sorbent by Zr–O bonds and Mn–O bonds. Mn(IV) and Mn(III) in K-OMS-2@UiO-66 effectively oxidized As(III) to As(V). Then, some negatively charged As(V) were adsorbed at the positive sites of the adsorbent through electrostatic attraction, while others formed bidentate complexes with the Zr–O bonds. This study develops an attractive sorbent for As(III) removal from contaminated water and has a facile and low-cost synthesis process, good As(III) sorption performance, and reusability.
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PLASMA SCIENCE & TECHNOLOGY
·
2023
·Vol. 25
·期 8
·085505
·
IF 1.7
Tian ZHOU,Douhao YANG,Yijun WANG,Jiushan CHENG,Qiang CHEN,Bowen LIU,Zhongwei LIU
Defect engineering of metal-organic frameworks has attracted increasing attention in recent years for potential applications in gas storage and catalysis. In this study, defective UiO-66 is obtained by Ar and H2 plasma treatments. Compared with the pristine UiO-66, a new aperture with a size of ∼4 nm appears for a sample with the plasma modification, indicating the formation of mesopores within UiO-66 framework. Characterization results demonstrate that the pore volume, surface area and the number of Lewis and Brönsted acid sites can be easily tuned by varying the discharge parameters. The adsorption performance of UiO-66 is evaluated for the adsorption of methyl blue. In comparison to the pristine UiO-66 and the sample with H2 plasma treatment, the Ar plasma modified sample shows excellent adsorption activity due to the suitable pore size and volume. Equilibrium adsorption capacity as high as 40.6 mg·g−1 is achieved for the UiO-66 (Ar) sample.
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APPLIED CATALYSIS A-GENERAL
·
2022
·
IF 5.723
Yulin Li,Xiangyunxiu Meng,Ruiwen Luo,Haonan Zhou,Shuyan Lu,Shuning Yu,Peng Bai,Xianghai Guo,Jiafei Lyu
Glucose isomerization into fructose is the dominant reaction path for biomass conversion . Lewis acidic aluminum or tin were firstly impregnated in microporous UiO-66 for remarkably enhanced glucose isomerization. Al@UiO-66 achieved 37.5% fructose yield with a 63.9% selectivity with no obvious leaching of aluminum while Sn@UiO-66 failed the leaching test. The 27 Al NMR and XPS spectra of Al@UiO-66 demonstrated the complex environment of aluminum in UiO-66 involving the chains of aluminum octahedra and the Al–O–C structure, which contributed to the enhanced Lewis acidity and promoted performance of the catalyst.
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Biosensors-Basel
·
2024
·Vol. 14
·期 10
·512
·
IF 4.9
Jiawen Fan,Junjie Qi,Jingkun Li,Fuwei Pi
Arginine has been widely applied in the food industry as coloring agents, flavoring agents, and nutritional fortifiers. It is also one of the major components of feed additives. Currently, methods for the highly selective detection of arginine remain absent. For accurate and sensitive detection of L−arginine, a novel ratiometric fluorescence assay based on Ru@UiO-66-NH2was developed and demonstrated in this study. Under optimized detection conditions, the limit of detection (LOD) of this assay for L-arginine was 2.32 μM, which is superior to most assays reported to date. Meanwhile, Ru@UiO-66-NH2showed good stability within 30 days, demonstrating the wide applicability of the proposed assay. The spike-and-recovery rates of the proposed assay for L-arginine in real samples (e.g., tea, grape juice, and serum) were 84.27–113.09%. Overall, the proposed assay showed high sensitivity, good reproducibility, and excellent stability in the detection of L-arginine in both buffer and real samples.
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JOURNAL OF CHROMATOGRAPHY A
·
2025
·
IF 4
Xuejing Lou,Yingge Hao,Huina Zhou,Zhen Song,Youmei Wang,Minghua Lu
The creation of defects in crystalline structures can tune metal-organic frameworks (MOFs) properties, such as improving their adsorptive and catalytic performance with producing more porosity and active sites. In this work, the bimetallic UiO-66 containing Zn and Zr was prepared. And then UiO-66 with missing cluster defects (UiO-66-1/3) were obtained by acid washing to remove the Zn nodes. UiO-66-1/3 was used as sorbent of dispersive solid-phase extraction (dSPE) to extract and enrich (BUs). Combination with high-performance liquid chromatography-diode array detector (HPLC-DAD) was developed to detect trace BUs in soil samples. Adsorption equilibrium can be reached in 3 min. The method possesses high enrichment factor (202-325), low detection limit (0.005-0.04 ng·mL -1 ), and wide linear range (0.02-200 ng·mL -1 ). In addition, the recovery rate of UiO-66-1/3 as an adsorbent was still higher than 95% after reused for 16 times. This work provides a new material for the enrichment and detection of benzoylurea insecticides in the environment.
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