SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Huidong Wang,Ziyu Gao,Jianmin Sun
Finding robust combination modes between ionic liquids and MOFs is still a challenge. In this work, using a simple one step-synthesis method, the ionic liquid was grafted onto MOF without any additives, and the binding mode of the two was characterized by means of XPS, FT-IR, TGA, SEM etc. It was found that the carboxyl group in the ionic liquid bonded with the amino group in MOF to form an amide bond. Thus, a novel stable composite material MIL-101-NH 2 -1-carboxypropyl-3-methylimidazolium bromine (1-C-3-M@MIL-101-NH 2 ) was synthesized. This composite employed as a catalyst for CO 2 cycloaddition demonstrated excellent catalytic activity, achieving a target product PC (Propylene carbonate) yield of 91.7 % under the conditions of 80 °C, 1.0 MPa, and a reaction time of 4 h, without the addition of any co-catalysts or solvents. The good catalytic activity was benefit from the synergistic effect of Lewis acidic Cr centers and nucleophilic Br - , as well as the high specific surface area and good CO 2 affinity of 1-C-3-M@MIL-101-NH 2 . In addition, owing to this robust bonding configuration, the catalyst can be recycled up to five times without losing activity. It is a potential catalyst for CO 2 capture and conversion.
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MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-9
·
IF 6.232
Li Jingxian,Jiang Ding,Shan Xueling,Wang Wenchang,Chen Zhidong
A novel “off-on” electrochemiluminescence (ECL) aptasensor based on ECL resonance energy transfer (RET) system from 3,4,9,10-perylenetetracar-boxylic acid/the metal-organic frameworks NH 2 -MIL-125(Ti) (PTCA/NH 2 -MIL-125) to Au nanoparticles (Au NPs) was put forward for microcystin-LR (MC-LR) assay. The electrochemiluminescence (ECL) emission spectra of PTCA/NH 2 -MIL-125 show excellent spectral overlap with the UV-vis absorption spectrum of Au NPs. A linear response ranging from 10 fM (9.95 × 10 −6 μg L −1 ) to 0.1 μM (99.5 μg L −1 ) was obtained, and the detection limit was 3.6 fM (3.58 × 10 −6 μg L −1 ) under optimal conditions at a potential of − 1.6 V ( S/N = 3). Besides, the prepared ECL-RET MC-LR aptasensor exhibited good selectivity and stability.
Graphical abstract
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Small
·
2024
·Vol. 20
·期 27
·2309541
·
IF 13
Tingting Liu,Kaiyue Hu,Yansheng Li,Yanhong Wang,Dongmei Han,Zhihua Wang,Fubo Gu
The Z-scheme MIL-88B/BiOBr (referred to as M x B y , whereas x and y are the mass of MIL-88B(Fe) and BiOBr) heterojunction photocatalysts are successfully prepared by a facile ball milling method. By adding low concentration H 2 O 2 under visible light irradiation, the Z-scheme heterojunction and photocatalytic-Fenton-like reaction synergistically enhance the degradation and mineralization of ciprofloxacin (CIP). Among them, M50B150 showed efficient photodegradation efficiency and excellent cycling stability, with 94.6% removal of CIP (10 mg L −1 ) by M50B150 (0.2 g L −1 ) under 90 min of visible light. In the M x B y heterojunctions, the rapid transfer of photo-generated electrons not only directly decomposed H 2 O 2 to generate · OH, but also improved the cycle of Fe 3+ /Fe 2+ pairs, which facilitated the reaction with H 2 O 2 to generate · OH and · O 2 − radicals. In addition, the effects of photocatalyst dosages, pH of CIP solution, and coexisting substances on CIP removal are systematically investigated. It is found that the photocatalytic- Fenton-like reaction can be carried out at a pH close to neutral conditions. Finally, the charge transfer mechanism of the Z-scheme is verified by electron spin resonance (ESR) signals. The ecotoxicity of CIP degradation products is estimated by the T.E.S.T tool, indicating that the constructed photocatalysis-Fenton-like system is a green wastewater treatment technology.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2022
·Vol. 46
·期 15
·23480-23492
·
IF 4.672
Lingxin Meng,Zhenguo Zhang,Mengchi Ju,Jingmei Xu,Zhe Wang
Summary Organic-inorganic modification by incorporating metal-organic frameworks to copolymers is one strategy to advance the properties of membranes. Here, the imidazole-loaded MIL-101-NH 2 (Im@MIL-101-NH 2 ) was prepared and chemically anchored onto sulfonated poly (arylene ether ketone sulfone) containing carboxyl groups (C-SPAEKS). The chemical stabilities, mechanical properties, and dimensional stabilities of compound membranes were increased. The highest tensile strength of C-SPAEKS-IM6 reach to 105.36 MPa. The weight retention rate of hybrid membranes was still higher than 90% after the oxidation stability test at 80°C. Furthermore, the introducing Im@MIL-101-NH 2 could construct new proton transport paths, and the amphiphilic imidazole molecules embedded inside Im@MIL-101-NH 2 could act as proton carriers. The C-SPAEKS-IM6 showed a maximum proton conductivity of 0.082 S cm −1 at 90°C. Additionally, the peak power density of C-SPAEKS-IM6 was 171.52 mW cm −2 . To sum up, this series of membranes have latent capacity in the application of fuel cells. Im@MIL-101-NH 2 was anchored on polymer backbones via the Hinsberg reaction. Chemical bonds between MOFs and polymer chains improved compatibility of two phases. Cross-linking structure enhanced the mechanical property and oxidative stability. The sulfonamide groups could devote protons and transport it to MOFs.
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Journal of Environmental Sciences
·
2023
·
IF 6.9
Lei Zheng,Lixia Sun,Jiangbo Qiu,Junling Song,Luyi Zou,Yue Teng,Yongzhong Zong,Hongyan Yu
The coexistence of inorganic and organic contaminants is a challenge for real-life water treatment applications. Therefore, in this research, we used NH 2 -MIL-125(Ti) to evaluate the single adsorption of hexavalent chromium (Cr(VI)) or Rhodamine B (RhB) in an aqueous solution and further investigate simultaneous adsorption experiments to compare the adsorption behavior changes. The main influencing factors, for example, reaction time, initial concentration, reaction temperature, and pH were studied in detail. In all reaction systems, the pseudo-second-order kinetic and Langmuir isotherm models were well illuminated the adsorption progress of Cr(VI) and RhB. Thermodynamic studies showed that the adsorption process was spontaneous and endothermic. As compared to the single system, the adsorption capacity of Cr(VI) in the binary system gradually decreased as the additive amount of RhB increased, whereas the adsorption capacity of RhB in the binary system was expanded brilliantly. When the binary reaction system contained 100 mg/L Cr(VI), the removal rate of RhB increased to 97.58%. The formation of Cr(VI)-RhB and Cr(III)-RhB complexes was the cause that provided facilitation for the adsorption of RhB. These findings prove that the interactions during the water treatment process between contaminants may obtain additional benefits, contributing to a better adsorption capacity of co-existing contaminant.
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BIOSENSORS & BIOELECTRONICS
·
2021
·
IF 10.618
Yukun Yang,Wenyan Yan,Xiaomin Wang,Ligang Yu,Jinhua Zhang,Baoqing Bai,Caixia Guo,Sanhong Fan
In this work, a molecularly imprinted photoelectrochemical (MIP-PEC) sensor based on a novel PEC composite of metal-organic frameworks (MOFs) and TiO 2 (NH 2 -MIL-125(Ti)–TiO 2 ) was established for the ultrasensitive and selective detection of oxytetracycline (OTC). This is the first attempt of applying MOFs in the construction of MIP-PEC sensor. The NH 2 -MIL-125(Ti)–TiO 2 was synthesized by a simple one-step solvothermal method and modified onto the surface of indium tin oxide (ITO) electrode as the photosensitive layer. Subsequently, molecularly imprinted polymer (MIP) was modified as recognition element by electropolymerization . The NH 2 -MIL-125(Ti)–TiO 2 showed an enhanced photocurrent response due to stronger light absorption capacity and matched energy band. Furthermore, MIP greatly improved the selectivity and sensitivity of the constructed PEC sensor. The photocurrent response of the MIP-PEC sensor was reduced after OTC recognition because the specific binding of OTC to the imprinted cavities blocked the electron transfer of the electrode. Under optimal experimental conditions, the MIP-PEC sensor exhibited a wide detection range from 0.1 nM to 10 μM with a low limit of detection (LOD) of 60 pM, as well as certain reproducibility, stability and good applicability in real samples. The proposed sensor provides ideas for the application of MOFs in the construction of PEC sensors and will offer an alternative method for the detection of other pollutants in the field of food safety.
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ANALYST
·
2015
·Vol. 140
·期 24
·8201-8208
·
IF 4.107
Zheng Juan Sun,Jun Ze Jiang,Yuan Fang Li
Herein, we present a novel strategy based on a “turn-on” fluorescence system made up of metal–organic frameworks Fe-MIL-88 and H2O2 for detecting biothiols in human serum. The nonfluorescent Fe-MIL-88 gives weak fluorescence in the presence of H2O2. Interestingly, it was found that biothiols such as glutathione (GSH), cysteine (Cys) or homocysteine (Hcy) could induce fluorescence turn-on of the Fe-MIL-88/H2O2 system. Under optimal conditions, the relative fluorescence intensity exhibited a good linear relationship in the range from 50 nM–10 μM for GSH (r = 0.994), 50 nM–10 μM for Cys (r = 0.990), and 50 nM–10 μM (r = 0.992) for Hcy; the detection limits of GSH, Cys and Hcy were 30 nM, 40 nM, and 40 nM respectively. Mechanism investigation reveals that biothiols could associate with Fe-MIL-88 via hydrogen bonding and electrostatic interaction followed by redox reaction between biothiols and Fe3+ present in the Fe-MIL-88, Fe3+ was thus reduced to Fe2+, and then Fe2+ could efficiently catalyze the decomposition of H2O2 to yield ˙OH radicals through the Fenton reaction. Besides, biothiols were able to reduce H2O2 to produce ˙OH radicals directly. Thus the Fe-MIL-88 as well as biothiols could cooperatively contribute to the activation of H2O2 to generate higher amounts of ˙OH radicals, which in turn oxidize the free ligand terephthalic acid (BDC) outside or within the Fe-MIL-88 structure to strongly fluorescent hydroxylated terephthalic acid (OHBDC), thereby turning on the fluorescence.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Lulu Yuan,Ziyu Lin,Xue Li,Zhiwei Zhao,Liyuan Chen,Qiang Ren,Siwen Ding,Jinhui Pang,Zhenhua Jiang
Polymer-MOF composite membranes have attracted the attention of researchers in the field of organic solvent nanofiltration by fully utilizing the synergistic advantages of the processability of polymers and the molecular sieving properties of metal-organic frameworks (MOFs). However, the performance of such composite membranes in organic solvents is greatly reduced by insufficient interfacial interactions at the polymer-MOF interface. In this study, an in situ co -construction strategy of polyaniline (PANI) and MOF was employed to create a stabilized interface on the polymer matrix while converting the poly(ether ether ketone) precursor substrate (PEEKt) into solvent-resistant PEEK to fabricate high-performance nanofiltration membranes for organic solvents (PEEK-PANI@MIL-101). This composite membrane exhibits a rejection rate exceeding 97 % for Rose Bengal (RB) in ethanol solution, coupled with an ultrahigh ethanol permeance of 266 L m −2 h −1 bar −1 . The integrated dual in situ growth strategy significantly enhances the interfacial adhesion of the composite membrane. Furthermore, the membrane demonstrates outstanding thermal resistance and acid stability, ensuring robust performance under harsh operating conditions.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 9
·2458-2467
·
IF 2.162
Zhongwei Chen,Tingting Chen,Yuan Yu,Qingwu Zhang,Zhiquan Chen,Juncheng Jiang
Metal-organic framework MIL-53 (Fe)@C/graphite carbon nitride hybrid (MFeCN), a novel flame retardant, was synthesized by hydrothermal reaction and subsequently added into unsaturated polyester resin (UPR). The structure, morphology, and thermal stability of MFeCN were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), and thermogravimetric analysis (TG). The thermal stability and flammability of the UPR composites were characterized by TG and cone calorimeter tests (CCT). The results of CCT demonstrated that the peak heat release rate (pHRR), total heat release (THR), peak smoke production rate (pSPR), and total smoke production (TSP) of UPR/MFeCN-4 were reduced by 39.8%, 10.2%, 33.3%, and 14.5%, respectively, comparing with UPR. The results of TG and CCT indicated that MFeCN could improve the thermal stability, flame retardancy, and smoke suppression properties of the UPR composites. The residues after CCT were then characterized by laser Raman spectroscopy (LRS), XPS, and SEM. Finally, based on the above experimental results and analysis, the flame retardancy mechanism of MFeCN was proposed.
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JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2024
·
IF 1.5
Song Lixin,Zhang Jian,Wang Mingyu,Huang Zhipeng,Zhang Yunxia,Zhang Xing,Liang Yutao,He Juan
A novel approach for the simultaneous separation of zearalenone (ZEN) and four types of aflatoxins (AFB1, AFB2, AFG1 and AFG2) from rice samples was presented. This approach utilized modified MIL-101(Cr)-NH2 as core, with molecularly imprinted polymers (MIPs) serving as the shell. The MIL-101(Cr)-NH2 was prepared via ring-opening reaction, while the imprinted polymers were synthesized using warfarin and 4-methylumbelliferyl acetate as co-pseudo template, ethylene glycol dimethacrylate as the cross-linker and azobisisobutyronitrile as initiator. The resulting co-pseudo-template-MIPs (CPT-MIPs) were thoroughly characterized and evaluated. Adsorption studies demonstrate that the adsorption process of CPT-MIPs follows a chemical monolayer adsorption mechanism, with imprinted factors ranging from 1.24 to 1.52 and selective factors ranging from 1.29 to 1.52. Self-made columns were prepared, and the method for separation was developed and validated. The limit of detections ranged from 0.12 to 2.09 μg/kg, and the limit of qualifications ranged from 1.2 to 6.25 μg/kg. To assess the reliability of the method, ZEN and AFs were spiked at three different levels, and the recoveries ranged from 79.53 to 94.58%, with relative standard deviations of 2.90–5.78%.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 5
·123953
·
IF 7.5
Suqing Zhu,Qunxian Yuan,Donglan Ning,Jinyue Wei,Wenhan Sun,Xinpeng Wang
The safe interception and permanent stabilization of radioactive iodine released during nuclear fuel processing are critical for ecological security and public health. However, traditional adsorbents for capturing and storing iodine vapor are still plagued with unsatisfactory uptake capacity, poor structural robustness. Herein, a unique core-satellite ZIF-67-on-MIL-167 (MOF-on-MOF) composite is fabricated through a controllable heterogeneous nucleation and growth route, which was designed for the efficient capture of radioactive iodine. Experimental data shown that delivers a maximum iodine vapor uptake of 5.600 g/g under dry atmosphere, representing a 2.03-fold and 1.42-fold increase compared to pure ZIF-67 and MIL-167, respectively. It is important to note that the iodine adsorption capacity of ZIF-67-on-MIL-167 is rarely influenced by the humid environment in a relative humidity of 18%. Furthermore, ZIF-67-on-MIL-167 exhibited excellent chemical and thermal stability, maintaining a stable framework structure at temperatures as high as 283 °C, and the iodine-loaded ZIF-67-on-MIL-167 exhibited an exceptionally high radioiodine outstanding iodine retention efficiency of 94.25% after being exposed to ambient conditions for 7 days. The composite material exhibited a high degree of synergy between its N-rich imidazole structure, abundant Ti−oxo clusters, and uncoordinated carboxylic (C O) functional groups. This synergy resulted in the provision of numerous active sites and the facilitation of charge transfer, thereby enabling the efficient capture of radioactive iodine. The adsorbent developed in this work is both reliable and effective, showing promise for practical application in radioactive iodine capture.
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INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
·
2026
·
IF 6.2
Ying Li,Jue Wang,Yue Liu,Yinshui He,Xiongxin Jiang,Qinglin Li,Yan Ma,Guangbin Yi,Xiaowu Hu
Developing phase change materials (PCMs) with high energy storage efficiency, thermal conductivity, and shape stability is important for thermal management of electronic devices and other low-temperature energy-storage applications. In this study, amino-functionalized MIL-101 (MIL-101-NH₂) was used as a porous metal-organic framework carrier, and lauric acid (LA) was used as the organic PCM. LA was incorporated into MIL-101 and MIL-101-NH₂ through solution impregnation to construct shape-stable composite phase change materials (CPCMs). The optimized LA/MIL-101-NH₂-3 sample exhibited a thermal conductivity of 0.818 W/m·K, which is 337% higher than that of pure LA (0.187 W/m·K), while maintaining a melting enthalpy of 69.4 J/g. Molecular dynamics (MD) simulations further revealed that amino groups on the MIL-101-NH₂ framework form abundant hydrogen bonds with the carboxyl groups of LA, strengthen interfacial phonon coupling, and reduce interfacial thermal resistance. Post-impregnation pore analysis, leakage tests, thermal cycling, and thermal management experiments jointly confirm that the improved performance originates from the synergistic effects of pore confinement, amino-mediated interfacial interactions, and continuous MOF-assisted heat-transfer pathways. This work provides experimental evidence and molecular-level insight for the rational design of MOF-based CPCMs for thermal energy management and broader low-temperature latent heat storage applications.
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