Nanomaterials
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2021
·Vol. 11
·期 7
·1847
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IF 5.076
Yan Ma,Yujie Miao,Guomei Mu,Dunmin Lin,Chenggang Xu,Wen Zeng,Fengyu Xie
Great expectations have been held for the electrochemical splitting of water for producing hydrogen as a significant carbon-neutral technology aimed at solving the global energy crisis and greenhouse gas issues. However, the oxygen evolution reaction (OER) process must be energetically catalyzed over a long period at high output, leading to challenges for efficient and stable processing of electrodes for practical purposes. Here, we first prepared Fe-MOF nanosheet arrays on nickel foam via rare-earth erbium doping (Er0.4Fe-MOF/NF) and applied them as OER electrocatalysts. The Er0.4Fe-MOF/NF exhibited wonderful OER performance and could yield a 100 mA cm−2current density at an overpotential of 248 mV with outstanding long-term electrochemical durability for at least 100 h. At large current densities of 500 and 1000 mA cm−2, overpotentials of only 297 mV and 326 mV were achieved, respectively, revealing its potential in industrial applications. The enhancement was attributed to the synergistic effects of the Fe and Er sites, with Er playing a supporting role in the engineering of the electronic states of the Fe sites to endow them with enhanced OER activity. Such a strategy of engineering the OER activity of Fe-MOF via rare-earth ion doping paves a new avenue to design other MOF catalysts for industrial OER applications.Keywords:rare-earth doping;MOFs;large current;electronic structure
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International Journal of Minerals Metallurgy and Materials
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2022
·Vol. 29
·期 5
·1061-1072
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IF 3.85
Zhong Jianjian,Qin Lu,Li Jianling,Yang Zhe,Yang Kai,Zhang Mingjie
Two-dimensional Ti 3 C 2 T x exhibits outstanding rate property and cycle performance in lithium-ion capacitors (LICs) due to its unique layered structure, excellent electronic conductivity, and high specific surface area. However, like graphene, Ti 3 C 2 T x restacks during electrochemical cycling due to hydrogen bonding or van der Waals forces, leading to a decrease in the specific surface area and an increase in the diffusion distance of electrolyte ions between the interlayer of the material. Here, a transition metal selenide MoSe 2 with a special three-stacked atomic layered structure, derived from metal—organic framework (MOF), is introduced into the Ti 3 C 2 T x structure through a solvo-thermal method. The synergic effects of rapid Li + diffusion and pillaring effect from the MoSe 2 and excellent conductivity from the Ti 3 C 2 T x sheets endow the material with excellent electrochemical reaction kinetics and capacity. The composite Ti 3 C 2 T x @MoSe 2 material exhibits a high capacity over 300 mAh·g −1 at 150 mA·g −1 and excellent rate property with a specific capacity of 150 mAh·g −1 at 1500 mA·g −1 . Additionally, the material shows a superior capacitive contribution of 86.0% at 2.0 mV·s −1 due to the fast electrochemical reactions. A Ti 3 C 2 T x @MoSe 2 //AC LIC device is also fabricated and exhibits stable cycle performance.
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Nano Hybrids and Composites
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2022
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IF 0
Yue Zhang,Tao Li,Shi Yu Tang,Xin Yue Xie,Ru Zeng Liang,Xiao Xiao Chu
Increasing demands of microwave absorbents require new approaches to enhance the absorbing performance. Metal−organic frameworks (MOFs) could be developed as effective absorbers owing to their outstanding features including intrinsic porosity and high specific area. Herein, novel nanostructured Co-MOF-74 composites have been successfully fabricated via a simple solvothermal method. Excellent absorption performance was achieved for the composite with a minimum reflection loss (RL) of −25.5 dB at 2.5 mm and a broad absorption bandwidth (RL < −10 dB) of 6.7 GHz. Such absorber could be developed as lightweight and high-efficiency absorbing materials, and this work provides inspiration for the design of advanced absorbers with strong dissipation capacity and broad effective bandwidth.
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MICROCHEMICAL JOURNAL
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2021
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IF 4.821
Wang Pan,Zhou Zheng,Xingxing Wu,Jiaojiao Gao,Yani Liu,Qunhui Yuan,Wei Gan
The development of transition metal based enzyme-free glucose (Glu) sensor with high sensitivity, wide linear range, and long-term stability is highly desired. Herein, a series of 2D/3D hierarchical structured bimetallic organic framework (NiCu-MOF- x , x = 2, 4, 6, 8) were developed through a one-step hydrothermal route by adjusting the ratio of nickel and copper salts. The morphological similarity of NiCu-MOF- x and Ni-MOF was evidenced by X-ray diffraction survey. The structural evolution of NiCu-MOF- x was revealed by scanning electron microscopy. The optimal NiCu-MOF-6 exhibits high electrocatalytic activity toward Glu oxidation. Being applied as the electrode modifier for glassy carbon electrode (GCE), NiCu-MOF-6/GCE exhibits a remarkably widened linear range than its monometallic analog, owing to its significantly increased electrochemical surface area, interconnected channels for mass/electron transfer and synergistically functionalized Ni/Cu electroactive sites. Being applied in human serum analysis, this sensor shows a good feasibility with satisfying recoveries.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2023
·Vol. 21
·期 1
·1-12
·
IF 10.2
Qiu Lirong,Ouyang Chengcheng,Zhang Wei,Liu Jia,Yu Luting,Chen Guoguang,Ren Lili
Atopic dermatitis (AD) is a chronic and recurrent inflammation disease associated with immune dysfunction. The high level of reactive oxygen species (ROS) causes high oxidative stress and further results in the deterioration of AD. At the same time, the ROS produced by bacterial infection can further aggravate AD. Here, the prepared PVA-based hydrogel (Gel) has a high ROS scavenging ability, and the antibacterial agent Zn-MOF(ZIF-8) loaded into the hydrogel shows a lasting and effective antibacterial activity. Thus, a Zn-MOF hydrogel (Gel@ZIF-8) is prepared to regulate ROS-mediated inflammatory microenvironment. In vitro experiments show that Gel@ZIF-8 has good antibacterial effect and cell biocompatibility. In the AD-induced mouse model, Gel@ZIF-8 can significantly enhance the therapeutic effect, such as reduce the thickness of epidermis, the number of mast cells and IgE antibodies. The results indicate that the ROS-scavenging hydrogel could treat the AD by regulating the inflammatory microenvironment, providing a promising treatment for managing AD.
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MOLECULES
·
2022
·Vol. 27
·期 17
·5427
·
IF 4.927
Song Li,Jing Yan,Qiangqiang Zhu,Xinxiang Liu,Senlin Li,Shenhou Wang,Xuanjun Wang,Jun Sheng
Tea contains high levels of the compound epigallocatechin gallate (EGCG). It is considered an important functional component in tea and has anti-cancer, antioxidant, and anti-inflammatory effects. The eight phenolic hydroxyl groups in EGCG’s chemical structure are the basis for EGCG’s multiple biological effects. At the same time, it also leads to poor chemical stability, rendering EGCG prone to oxidation and isomerization reactions that change its original structure and biological activity. Learning how to maintain the activity of EGCG has become an important goal in understanding the biological activity of EGCG and the research and development of tea-related products. Metal–organic frameworks (MOFs) are porous materials with a three-dimensional network structure that are composed of inorganic metals or metal clusters together with organic complexes. MOFs exploit the porous nature of the material itself. When a drug is an appropriate size, it can be wrapped into the pores by physical or chemical methods; this allows the drug to be released slowly, and MOFs can also reduce drug toxicity. In this study, we used MOF Zn(BTC)4materials to load EGCG and investigated the sustained release effect of EGCG@MOF Zn(BTC)4and the biological effects on wound healing in a diabetic mouse model.Keywords:EGCG;MOF;wound healing;diabetes
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ENERGY CONVERSION AND MANAGEMENT
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2025
·
IF 10.9
Xinyu Zhou,Yaohui Feng,Lurong Ge,Zixuan Su,Tianshu Ge
Desiccant coated heat exchanger (DCHE) is a promising and energy-efficient dehumidification unit, which uses cooling source to overcome sorption heat effect. Recently, metal–organic framework (MOF) is emerging in this filed due to its S-shaped isotherms, leading to reduced requirements for regeneration temperature differences. However, this unique characteristic of MOF also means that each adsorbent can only function under conditions where the relative humidity (RH) is limited, and adsorbents with high stepwise relative humidity are difficult to function under low humidity conditions. This work proposes a two-stage MOF-coated heat exchanger (MCHE), where the first stage utilizes MOFs that operate under high RH, while the second stage employs adsorbents capable of functioning at low RH, aiming to achieve efficient cascade dehumidification over a wide humidity range. MIL-101(Cr) and Al-fumarate were respectively selected for the first and second stages for experimental verification. The influence mechanisms of key parameters such as switching period, cooling/hot water temperatures, and air conditions were investigated. Compared with the single stage configuration, the two-stage MCHE in this work exhibits better heat and mass transfer performance, achieving a lower supply air temperature (2–3 °C lower) and a higher dehumidification efficiency (10 % higher). This study verifies the feasibility and applicability of the proposed system, providing a new approach for efficient dehumidification under wide humidity range.
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APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Ran Zhang,Shangjie Zhao,Qianxi Li,Ke Wang,Ke Zhang,Xiaofan Ding,Jing Zhao,Songtao Xiao
Thorium ions, known for their elevated toxicity and radioactivity, pose substantial ecological hazards, highlighting the need for efficient technologies to selectively eliminate them from water. The solid adsorption approach has gained widespread use in removing thorium ions because of its notable effectiveness, convenience, and straightforward operation. The key to this method’s success is the solid-phase adsorbent, underscoring the pressing need to develop exceptionally efficient adsorbents for thorium ion removal. Here, we present a novel in situ synthesis approach for enhancing an aluminum-based Metal-Organic Framework (Al-MOF) through the incorporation of iron oxide (Fe 3 O 4 ). The resulting Fe 3 O 4 /Al-MOF composite adsorbent demonstrates exceptional performance: (a) unparalleled adsorption capacity, achieving a remarkable Th(IV) uptake of 3058.0 mg g −1 , significantly outperforming the unmodified Al-MOF (1324.6 mg g −1 ); (b) outstanding selectivity, exhibiting high specificity for Th(IV) adsorption (SF Th/metals > 1000); (c) superb reusability, with excellent regeneration capabilities (85 % retention after 6 cycles). Through combined FT-IR and XPS analyses, we confirm that carboxylate oxygen atoms and Fe-O adsorption sites are key contributors to the Th(IV) adsorption mechanism. This work advances the design of efficient MOF-based composite adsorbents through valuable insights.
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FOOD CHEMISTRY
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2025
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IF 9.8
Xuan Wang,Xu Meng,Tao Liang,Jiachun Song,Kamal Eldin Afaf,Hong Duan,Lingyan Zheng,Gang Chen
γ-Cyclodextrin (γ-CD) is one of the most widely used materials for encapsulating hydrophobic functional molecules due to its distinctive structural features, especially an internal hydrophobic cavity surrounded by external hydrophilic surface. However, its limited loading capacity, adsorption efficiency, and poor stability hinder its broader applications. To address this issue, γ-cyclodextrin-based metal-organic frameworks (γ-CD-MOFs) was formed by anchoring potassium ions with γ-CD through hydrothermal self-assembly. After loading different hydrophobic small molecule active substances, a multifunctional composite coating was prepared by embedding them into the chitosan (CS) matrix. The release kinetic model analysis confirmed that the release behavior of Cinnamaldehyde (Cia), 2-methoxycinamaldehyde (2-MCA), and Curcumin (Cur) from γ-CD-MOFs conformed to the Ritger-Peppas equation. Compared with CS, CS/γ-CD-MOF@Cia has a strong inhibitory effect on E. coli O157: H7 and S. aureus . Sprayed on green grapes, the shelf life is extended to 21 days. CS/γ-CD-MOF@2-MCA can significantly reduce the spoilage of milk caused by photooxidation. Furthermore, compared with CS, the oxidation and browning of banana peels were effectively delayed by CS/γ-CD-MOF@Cur, and complete blackening is not observed even after 11 days of storage. By combining the advantages of chitosan and γ-CD-MOF, the active molecules with different functions were encapsulated on the platform of γ-CD-MOF to achieve antibacterial, light-blocking, and antioxidant effects on food. The novel functional coating materials presented in this work offer a promising approach to effectively prolonging the shelf life of fresh foods products.
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PROGRESS IN ORGANIC COATINGS
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2025
·
IF 7.3
Haoran Li,Tianqi Ma,Yanchao Wu,Huimin Qi,Ga Zhang,Huijing Li
Polysiloxanes, widely used in antifouling applications, confront significant challenges due to their damage in complex service environments, making the development of self-healing polysiloxanes (SHS) imperative. Current self-healing polymers underutilize silicone components, and intrinsic self-healing pure polysiloxanes, especially those integrated with functional fillers, remain largely unexplored. In this study, we developed a self-healing antifouling polysiloxane system through low-temperature green synthesis of H-bond-enriched polysiloxanes, combined with the synergistic photocatalytic/contact-killing effects of MIL-125-NH₂ and ionic liquid. The material achieves instantaneous self-healing at room-temperature after fracture through segmental mobility and hydrogen bond reconfiguration, with a final healing efficiency of up to 80.2 %. It demonstrates exceptional antibacterial activity under light irradiation while effectively reducing bacterial adhesion in dark environment. Moreover, it exhibits exceptional thermal stability up to 370 °C and demonstrates high resistance to both UV and X-ray radiation at elevated doses. This work provides an innovative solution for self-healing materials designed for harsh environments.
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PROGRESS IN NUCLEAR ENERGY
·
2025
·
IF 3.2
Bing Han,Zhiwei Zhao,Yijia Xu,Wencheng Yao,Yue Wen,Qi Wang,Zhuo Wang,Yuejie Ai
The efficient extraction of uranium from seawater plays an important role to guarantee a sustainable nuclear energy industry. Zr-based metal-organic frameworks (MOFs) are promising uranium adsorbents due to their high stability, customizable functionality and adjustable topological structure. In this study, Zr based MOF-808 with tunable phytic acid (PA) functionalization (MOF-808-PA1 and MOF-808-PA2) were prepared. The modulation of PA modification significantly promoted the uranium extraction of MOF-808 with the saturated adsorption capacity reaching 423.89 mg/g and adsorption equilibrium achieved in 15 min in aqueous solution. Impressively, MOF-808-PA2 exhibited superior selectivity towards uranium with the distribution coefficient up to 9.2 × 10 5 mL/g, which overwhelms other competitive ions in simulated seawater. After adsorption in real seawater for 28 days, uranium capture capacity of MOF-808-PA2 reached 7.85 mg/g, 8 times higher than that of vanadium. DFT simulation indicated that the excellent seawater uranium extraction performance originated from the strong affinity between abundant P-O/P=O and uranyl ions. This work highlights the design of high-performance uranium adsorbents based on functional group modification in MOFs system.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Beibei Zhang,Lihua Zhang,Jin Li,Jiawen Fu,Xiwei Qu
In the present work, a series of PVA and CS blend membranes were studied. These prepared membranes were evaluated by binary mixture gases of CO 2 /N 2 and CO 2 /CH 4 . The optimum ratio of PVA/CS for CO 2 permeance was achieved at 5:5. It recorded a CO 2 permeability of 20.8 GPU (1 GPU = 1 × 10 -6 ·cm 3 (STP)·cm −2 ·s −1 ·cmHg −1 ) with CO 2 /N 2 selectivity of 89.7, as well as CO 2 permeability of 10.2 GPU and CO 2 /CH 4 selectivity of 56.3. Secondly, two kinds of nanoparticle UiO-66 and UiO-66-NH 2 were used to prepare mixed matrix membranes. The effects of nanofiller content and chemical groups on gas permselectivity were investigated. Results show that the addition of nanoparticles can effectively improve the permselectivity of membrane. The mixed matrix membranes addition with UiO-66-NH 2 achieved the optimum CO 2 performance and these were following the order of PVA(5)/CS(5)-UiO-66-NH 2 > PVA(5)/CS(5)-UiO-66 > PVA(5)/CS(5). For all these membranes, the permeance and selectivity present initial increased and then decreased. Mixed matrix membranes addition UiO-66-NH 2 (containing 3.75 wt%) exhibits a CO 2 permeance of 32.77 GPU and CO 2 /N 2 selectivity of 93.47, as well as CO 2 permeance of 25.57 GPU and CO 2 /CH 4 selectivity of 70.1, which was beyond the 2008 Robeson upper bound.
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