COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chunliang Zhao,Jinghui Wu,Yidi Gao,Jialin Zhou,Leilei Zhang,Chi Wang,Yang Huo,Xianze Wang,Mingxin Huo
The rapid increase in PLA product consumption has led to significant environmental challenges. To address this issue, this study focuses on developing efficient catalysts to accelerate PLA alcoholysis, aiming to enhance degradation efficiency. A novel composite catalyst, SiWMn Ⅲ @MIL-125(Ti), was synthesized by encapsulating Keggin-type polyoxometalate (POM) in the octahedral cavities of MOF(MIL-125(Ti)). The compound was comprehensively characterized, while density functional theory (DFT) calculations further confirmed the potential localization of POM within the MOF. The catalyst exhibited excellent efficiency in the alcoholysis of polylactic acid (PLA) using ethylene glycol (EG) under optimum conditions (1 wt% catalyst, 160 °C, 30 min, EG/PLA molar ratio = 4:1, 18 % POM loading), achieving high PLA conversion. The liquid products were systematically analyzed, proposing their oligomeric structures. Notably, this heterogeneous catalyst could be easily retained by filtration and could be reused for more than 10 cycles without significant activity loss. Combined with DFT simulations, a reasonable catalytic mechanism was elucidated, highlighting the synergistic role of POM@MOF in facilitating alcoholysis of PLA. This work not only provides insights into the design of efficient MOF-based catalysts for polymer degradation but also suggests the potential applicability of POM@MOF systems in other depolymerization processes.
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HIGH PERFORMANCE POLYMERS
·
2024
·
IF 1.8
Li Tian,Ronghua Chen,Yabin Zhang,Qiang Zheng,Xingyu Wang,Jiang Tan,Junhong Guo,Bo Mu,Xuemei Bao
A functionalized cross-linked polyphosphazenes microsphere (Salen-PZN-Ni@Co-MOF) was fabricated by enveloping Salen-Ni-based polyphosphazenes (Salen-PZN-Ni) with a type of hybrid flame retardant (Co-MOF) to enhance the flame retardant, smoke suppression properties and mechanical properties of epoxy (EP) composites. Thermogravimetric analysis indicated that the incorporation of Salen-PZN-Ni@Co-MOF significantly enhanced the thermal stability of the EP composites. The existence of Salen-PZN-Ni@Co-MOF enhanced both the vertical burning rating and resulted in a higher limiting oxygen index. The addition of 5 wt% Salen-PZN-Ni@Co-MOF conspicuously improved the fire safety of EP, as evidenced by the results of the cone calorimeter. For instance, the peak heat release rate and total heat release rate of the EP composites were decreased by 25.3% and 44.97%, respectively. In addition, the incorporation of Salen-PZN-Ni@Co-MOF significantly inhibited the generation of toxic carbon monoxide and other volatile compounds. Furthermore, a synergistic effect between Salen-PZN-Ni and Co-MOF was observed. The proposed flame retardant mechanism of Salen-PZN-Ni@Co-MOF is attributed to the synergistic catalytic carbonization effect and the formation of thermally stable components. Consequently, enhanced fire safety in EP composites is achieved through the synergistic interaction among various components (nickel and Co-MOF) with polyphosphazene microspheres. Meanwhile, the excellent compatibility between Salen-PZN-Ni@Co-MOF and EP enhances the mechanical properties of EP composites.
研究领域:
材料科学
·
化学工程
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Sitong Huang,Jia Sun,Ke Xiao,Wenqing Zhang,Yuanlan Wang,Leixia Meng
To tackle the issue of interference from structural analogs in oxytetracycline (OTC) detection and to meet the growing demand for food safety monitoring, a photoelectrochemical (PEC) sensor employing molecular imprinting on a MOF-on-MOF heterojunction as photoactive substrate was constructed to achieve selective and accurate determination of OTC. The solvothermal and stirring synthesis of the MIL-125-NH 2 @Cu-hemin MOF heterojunction exhibit enhanced photocurrent, owing to efficient charge separation and expanded light absorption. The molecularly imprinted polymer (MIP) featured specific cavities to selectively capture OTC and regulate interfacial electron transfer. Under optimal conditions, the sensor showed a wide linear range (0.1 nmol L −1 –10 mmol L −1 ), a low detection of limit (LOD) of 42 pmol L −1 , and a limit of quantification (LOQ) of 140 pmol L −1 . By combining heterojunction-optimized photoelectric properties with MIP-based selective recognition, the sensor successfully detected OTC in complex food matrices, demonstrating its potential for food safety.
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NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Jiahui Li,Yufen Wang,Qinyuan Yu,Xuedong Wei
A kind of MoS2@CoFe-MOF electrocatalyst was prepared on carbon cloth by a one-pot hydrothermal method. Excellent electrocatalytic activity of MoS2@CoFe-MOF is demonstrated, and the catalyst has overpotentials of 220 mV and 405 mV at 10 mA cm−2 and 50 mA cm−2, respectively. It is found that the MoS2@CoFe-MOF electrode exhibits excellent stability at the end of operation for 48 000 s, and it has the highest electrochemically active specific surface area and the lowest charge transfer resistance. This work proposes a promising approach in energy chemistry for hydrogen production by electrolysis of water using electrocatalysts composed of non precious transition metal sulfides and bimetallic MOFs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Wei Zhou,Liangtao Xu,Ruxue Chen,Xin Wang,Youping Liu,Xin Di
As an important group of endocrine disrupting compounds, most steroid estrogens (SEs) found in environmental water have adverse health effects on aquatic organisms and humans. Sensitive detection of these SEs is crucial for protecting human health and ecosystem safety. Herein, a novel heterogeneous MOF-on-MOF membrane (ESM@His-ZIF-90@ZIF-8) was rationally designed by sequentially growing histidine-modified ZIF-90 and ZIF-8 on natural eggshell membrane (ESM), and employed as an efficient adsorbent for dispersive membrane extraction (DME) of estrone, estradiol and ethynylestradiol from environmental water. Due to the multiple adsorption sites provided by His-ZIF-90@ZIF-8 and the rapid separation of ESM from solution, the ESM@His-ZIF-90@ZIF-8 exhibited extraordinary extraction efficiency towards the three SEs. The adsorption behavior of the three SEs on the ESM@His-ZIF-90@ZIF-8 followed Langmuir isotherm and pseudo-second-order kinetic models. Notably, the ESM@His-ZIF-90@ZIF-8 showed fast adsorption kinetics with adsorption equilibrium of only 10 min. FT-IR, XPS and DFT calculation revealed that the rapid adsorption was attributed to the synergy of π-π stacking, hydrophobic and hydrogen bonding interactions. Additionally, the ESM@His-ZIF-90@ZIF-8 showed excellent reusability and the extraction efficiency remained above 90 % after 20 cycles of reuse. Under optimal conditions, the ESM@His-ZIF-90@ZIF-8-based DME method coupled with HPLC-UV offered good linearity (R 2 ≥ 0.9941) and low limits of detection of 0.30–0.45 μg L -1 . The method recoveries ranged from 85.0-102 % with RSDs lower than 7.2 %. This study highlighted the promising application of heterogeneous MOF-on-MOF membrane in the field of sample pretreatment.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Junning Wang,Mengyuan Bao,Tianxiang Wei,Zhaoyin Wang,Zhihui Dai
An iron-nickel bimetallic metal−organic framework (FeNi-MOF) with inner peroxidase-like activity as a support for enzyme immobilization was synthesized for the first time. And the GOx-mediated synthesis of mimic multienzyme system (GOx/FeNi-MOF) was obtained by a one-step biomimetic mineralization . FeNi-MOF played a dual role of a peroxidase mimic and a protective coating. Therefore, the obtained multienzyme system showed both peroxidase-like activity of FeNi-MOF and the biological activity of natural enzyme . FeNi-MOF acted as a peroxidase mimic, showing a higher affinity for hydrogen peroxide (H 2 O 2 ). The enhanced catalytic activity of the FeNi-MOF may result from synergistic effect between iron and nickel. In addition, the GOx/FeNi-MOF was selected as a proof of concept and succeeded in a one-step colorimetric detection of glucose by tandem catalysis. A small amount of the product was used for glucose detection, and the detection range was 0.3–35 mM, which indicated that our sensor can meet the clinical needs for diagnose diabetes.
研究领域:
生物化学
·
材料科学
·
医学诊断
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Chemical Engineering Journal Advances
·
2021
·
IF 0
Haidong Liu,Jingrui Shang,Lingjian Zeng,Binbin Cao,Hongbo Geng,Jianping Lang,Xueqin Cao,Hongwei Gu
Developing stable, efficient and economical electrocatalytic materials is still challenging for hydrogen evolution reaction (HER). Hence, we develop a Pd/Ni bimetallic carbon electrocatalyst (Pd/Ni-NC) with outstanding electrocatalytic performance. The catalyst derived from Pd-doped Ni-MOF (Pd/Ni-MOF) has particles and needle-like carbon tubes on its surface and is similar in shape to setaria. Benefiting from the composition and the unique structure, Pd/Ni-NC shows excellent HER catalytic performance with 16 mV at 10 mA cm −2 , superior to Pd or Ni single metal-carbon catalyst. Furthermore, it maintains stable catalytic activity under constant current for 25h. These results show the strategy that obtaining Pd and Ni bimetallic MOF by cation exchange and its corresponding bimetallic carbon material with setaria-shaped structure by calcination is powerful for high efficient HER performance.
研究领域:
材料科学
·
电化学
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CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Haiping Wang,Yujia Pei,Xueren Qian,Xianhui An
Metal-organic frameworks (MOFs) are emerging highly crystallized three-dimensional network complex formed by self-assembling metal ions and organic ligands. However, all MOFs are nanoscale and micro scale powder materials, which greatly impedes their further applications. In this study, a transparent Eu-MOF@TEMPO-oxidized cellulose nanofibrils (Eu-MOF@TOCNF) photoluminescence material for specifically detecting copper ions was fabricated via in-situ synthesis in hydroalcoholic medium. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, Fluorescence spectrometer and other equipment were applied to characterize functionalized TOCNF film samples, and the results confirmed the successful fabrication of the functionalized TOCNF film with stable fluorescence properties. The film performed a high selectivity toward copper ion in the presence of other interfering metal ions. The fluorescence intensity of the film decreased gradually with the increase of copper ion concentration, and I 0 / I -1 developed a good linear relationship with [Cu 2+ ], which made the film a promising material for detecting Cu 2+ in water body.
研究领域:
材料科学
·
环境科学
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuying Zhao,Fengming Zhou,Qiuyue Liang,Bo Zhang,Peng Wang,Qingliang Lv,Caixia Li,Zhenyu Xiao,Lei Wang
Although the intrinsic layer structure of layered double hydroxide (LDH) is beneficial for more accessible active centers and faster electrolyte ions diffusion rate than closed-packed atom arrangement for achieving higher capacitance, the narrow interlaminar spacing results in inevitable “death volume” during the rapid charging-discharging process. Herein, an electrochemical assistant MOF etching strategy is developed to construct hierarchical porous LDH with pre-embed OH − ions and filled H 2 O molecule in inter-layer space (E-MOF-0.5 V) for unsealing theoretical capacity. According to the valence equilibrium theory, the increased valence of the metal center during electrochemical polarization can accelerate the filling of OH − ions and H 2 O molecules in the LDH inter-layer space. The involved OH − and water molecules can achieve rapid mass transfer processes through ‘‘Newton’s Cradle’’ and the rich pore and ultra-thin layer structure may make sure the active centers are almost completely accessible. Therefore, the optimized E-MOF-0.5 V delivers an outstanding specific capacity of 8547.2 mF cm −2 (2670.9 F g −1 ) at 4 mA cm −2 and maintains an excellent cycling performance of 88 % after 7200 cycles at 20 mA cm −2 . Besides, an E-MOF-0.5 V//rGO-Zn hybrid supercapacitor device is assembled, which presents an energy density of 7.97 mWh cm −2 and a power density of 6.63 mW cm −2 .
研究领域:
材料科学
·
电化学
·
纳米结构
·
储能
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Nature Communications
·
2017
·Vol. 8
·期 1
·1-11
·
IF 12.124
Li Yuxiang,Yang Zaixing,Wang Yanlong,Bai Zhuanling,Zheng Tao,Dai Xing,Liu Shengtang,Gui Daxiang,Liu Wei,Chen Meng,Chen Lanhua,Diwu Juan,Zhu Lingyan,Zhou Ruhong,Chai Zhifang,Albrecht-Schmitt Thomas E.,Wang Shuao
Many environmental pollutants inherently exist in their anionic forms and are therefore highly mobile in natural water systems. Cationic framework materials that can capture those pollutants are highly desirable but scarcely reported. Here we present a mesoporous cationic thorium-based MOF (SCU-8) containing channels with a large inner diameter of 2.2 nm and possessing a high surface area of 1360 m 2 g −1 . The anion-exchange properties of SCU-8 were explored with many anions including small oxo anions like ReO 4
− and Cr 2 O 7
2− as well as anionic organic dyes like methyl blue and the persistent organic pollutant, perfluorooctane sulfonate (PFOS). Both fast uptake kinetics and great sorption selectivity toward PFOS are observed. The underlying sorption mechanism was probed using quantum mechanical and molecular dynamics simulations. These computational results reveal that PFOS anions are immobilized in SCU-8 by driving forces including electrostatic interactions, hydrogen bonds, hydrophobic interactions, and van der Waals interactions at different adsorption stages.
研究领域:
环境科学
·
材料科学
·
化学
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Science Advances
·
2023
·Vol. 9
·期 13
·
IF 13.6
Conger Li,Anheng Qi,Yang Ling,Yu Tao,Yue-Biao Zhang,Tao Li
Achieving percolation pathways in a metal-organic framework (MOF)–based mixed matrix membrane (MMM) without compromising its mechanical properties is challenging. We developed phase separated (PS)–MMMs with an interconnected MOF domain running across the whole membrane. Through demixing two immiscible polyimides, the MOF particles were selectively partitioned into one of the preferred polymer domains at over 50 volume % local packing density, leading to a percolated network at only 19 weight % MOF loading. The CO2 permeability of this PS-MMM is 6.6 times that of the pure polymer membrane, while the CO2/N2 and CO2/CH4 selectivity remain largely unchanged. Meanwhile, benefiting from its unique co-continuous morphology, the PS-MMM also exhibited markedly improved membrane ductility compared to the conventional MMM at similar MOF loading. PS-MMMs offer a practical solution to simultaneously achieve high membrane permeability and good mechanical properties.
研究领域:
材料科学
·
化学工程
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.7
Zi Wang,Junru Yao,Jinlong Lv,Yang Cao,Biao Lv,MinJie Liang,Honghong Zhao,Youyi Sun
Regulating electromagnetic pollution has become significance as 5G communication and radar technologies rapidly progress. This study proposes a macroporous engineering method utilizing polystyrene microsphere templates to address the limitations of single pore size structure and the difficulties in achieving impedance matching and loss capability in traditional carbon materials derived from metal-organic frameworks (MOFs). Co-Zn-C/C composite materials with a multi-level pore structure have been successfully synthesized. Through meticulous regulation of the PS template's dimensions via PVP dosage modifications, Metal-organic framework-on-Metal-organic framework (MOF-on-MOF) epitaxial growth, and a high-temperature carbonization of ZIF-8/ZIF-67, a composite material featuring a multi-level pore architecture (macropore mesoporous carbon nanotube network) and tunable pore size was synthesized. The results indicate that the material contains uniformly dispersed Co nanoparticles, a substantial specific surface area, and many nitrogen-doped defects. The optimized CZCC-2 sample demonstrates superior impedance matching and multi-mechanism synergistic attenuation, achieving an effective absorption bandwidth of 6.59 GHz at a thickness of 2.1 mm and a minimum reflection loss of −59.48 dB at 9 GHz at 3.0 mm, as per electromagnetic performance testing. The exceptional capability for suppressing electromagnetic wave scattering in practical applications is further validated by finite element modeling and radar cross-section (RCS) analysis. This paper presents innovative methods for developing absorbent materials that are thin, lightweight, broadband, high-intensity.
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