SYNTHETIC METALS
·
2025
·
IF 4.6
Ran Xu,Man He,Haoyuan Li,Shuangjiang Feng,Yongjuan Wang,Xiaohai Bu,Yuming Zhou
The strategy of customizing MOF-derived electromagnetic wave (EMW) absorbing materials through the construction of precursor size has become a new research direction. While exploring the dimensional adaptability of Co-MOF derivatives in graphene hybrid aerogel for electromagnetic wave absorption is not widely researched, manipulating the compositions and microstructures of EMW absorbing materials has been found to afford superior EMW absorption. Herein, a series of Co-N/C@graphene hybrid aerogel (CNGA) were successfully synthesized by integrating graphene and multi-scale Co-MOF derivatives which are derived from multi-scale Co-MOF precursors. The results displayed the CNGA containing nanoscale Co-MOF derivatives at a 20 wt% filler ratio exhibited the optimal reflection loss (−46.8 dB, 2.7 mm) and the maximum effective absorption bandwidth (5.3 GHz, 2.1 mm). The exceptional EMW absorption properties are credited to the collaborative impact of distinctive loss mechanisms benefited from the small particle size of Co-MOF derivatives in CNGA and appropriate filler ratio. This work demonstrates the correlations between the size of Co-MOF derivatives and electromagnetic parameters of CNGA, and provides a guidance for the development of advanced hybrid aerogel electromagnetic wave absorbing materials.
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DOI
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Qianyi Wu,Mohammed Kamruzzaman
The detection of mercury(II) (Hg2+) and chromium(VI) (Cr6+) is of significant importance due to their high toxicity and harmful effects on the environment and human health. Conventional detection methods are often expensive and time-consuming, highlighting the need for efficient alternatives. Nanozyme-based detection systems have emerged as promising solutions, offering high sensitivity, stability, and cost-effectiveness. However, many existing nanozymes contain toxic components, limiting their practical application in environmental and food safety monitoring. This study reported the development of an organic polymer-based C-A-Fe nanozyme, synthesized via a simple self-assembly chelation process and exhibiting peroxidase-like activity. This nanozyme enabled an effective colorimetric sensing approach for Hg2+ and Cr6+ detection. This nanozyme enables highly sensitive and selective colorimetric detection of Hg2+ and Cr6+ with the assistance of glutathione (GSH) and 8-hydroxyquinoline (8-HQ), achieving detection limits as low as 9.65 nM for Hg2+ and 4.13 nM for Cr6+. Moreover, the system demonstrated high recovery rates in tap water, cod, and spinach samples, confirming its potential for real-world applications in environmental and food safety monitoring.
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DOI
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Wanyu Li,Muzi Liu,Xiangyu Xin,Yu Xiao,Jinping Li,Guang Liu
MgH 2 is recognized as an exceptionally promising solid-state material for hydrogen storage, but its high thermodynamic stability, slow kinetics, and cycling-induced particle coarsening remain major obstacles to practical application. In this study, a composite oxide catalyst, Nb 2 O 5 @TiO 2 -C, was synthesized via a hydrothermal route by loading nano-Nb 2 O 5 onto a TiO 2 -C support derived from a Ti-based metal- organic framework. Doping with Nb 2 O 5 @TiO 2 -C markedly enhances the hydrogen storage performance of MgH 2 . Carbon within the support effectively suppresses nanoparticle agglomeration, while the catalyst is partially reduced to low-valence species during de/rehydrogenation cycles, both contributing to the enhanced performance. The MgH 2 -7 wt.% Nb 2 O 5 @TiO 2 -C composite starts dehydrogenating at 210.6 °C. At 300 °C, it rapidly releases over 6 wt% hydrogen within 5 min. The dehydrogenated sample also exhibits fast absorption kinetics, absorbing 6 wt% hydrogen within 1 min at 200 °C under 30 bar H 2 . Moreover, the system shows excellent cycling stability, retaining a hydrogen capacity of 6.6 wt% after 20 cycles.
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International Journal of Applied Ceramic Technology
·
2026
·Vol. 23
·期 1
·e70145
·
IF 2.3
Wenlong Zhang,Zhipeng Sun,Guixiu Liao,Yutong Ren,Ling He,Ling Pan,Yuhai Lu,Peng Xiao,Wei Zhou,Junjie Duan,Yang Li
Rare-earth hafnates show promising potential use in the development of a new generation of thermal/environmental barrier coatings (T/EBCs) owing to their high melting point, phase stability, and compatibility with SiC-based composites. In the current work, microstructural evolution and corrosion behavior of Yb 4 Hf 3 O 12 ceramics exposed to wet-oxygen and ambient air atmospheres at 1400°C were systematically investigated. Results revealed that sintering in air led to pronounced grain growth and homogenization, followed by secondary recrystallization at extended durations. Under wet-oxygen conditions, the ceramics underwent two distinct stages: initial Hf 4 + hydration and volatilization (0–20 h), and subsequent formation of Al 5 Yb 3 O 12 corrosion products due to reactions with Al(OH) 3 impurities (20–40 h). These processes induced fluctuations in grain size distribution, including growth, refinement, and re-coarsening, accompanied by microstructural densification and grain boundary corrosion. The findings highlight the pronounced role of water vapor and trace environmental impurities, demonstrating that alumina-based furnace environments can act as a variable influencing the structural integrity and apparent degradation behavior of Yb 4 Hf 3 O 12 , thereby providing valuable guidance for mechanistic studies of high temperature corrosion in future experimental investigations.
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CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Siyi Xiong,Yuan-Bin Chen,Junyu Chen
Currently, research on A 3+ B 3+ O 3 - type microwave dielectric ceramics is scarce. To address these challenges, a novel perovskite - type LaTmO 3 ceramic with a single phase orthorhombic structure (space group Pnma (62)) was synthesized via the solid state reaction method at 1450–1575 °C. Furthermore, SEM was employed to observe the microstructure of the sample, and Raman spectroscopy was utilized to analyze the impact of lattice vibrations on dielectric loss. Additionally, calculations based on the complex chemical bond theory revealed that the values of the εᵣ , Q×f , and τ f were influenced by bond ionicity, lattice energy, and bond energy, respectively. The LaTmO 3 ceramic sintered at 1525 °C demonstrated optimal microwave dielectric properties: Q×f = 179,601 ± 9579 GHz (at 8.4 GHz), εᵣ = 27.8 ± 0.18, and τ f = +9.8 ± 1.5 ppm/°C. Moreover, HFSS simulations demonstrated the applicability of LaTmO 3 in dielectric resonator antennas, achieving >90 % radiation efficiency, about 5.5 dBi gain, and 130 MHz bandwidth at 4.7 GHz, highlighting its potential for 5G oriented components.
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Nature Communications
·
2026
·
IF 15.7
Ya Zongyang,Li Mei,Fu Donglong,Zheng Yu,Wei Ruhan,Wang Hao,Zhang Kangning,Xu Dong,Zhang Zixuan,Zhang Xue,Yan Shen,Wang Hua,Zhang Shengbo,Gong Jinlong
Photocatalytic C−N coupling offers a promising approach for the sustainable production of amino acids, but the uncontrolled coupling pathway of reaction intermediates limits yield and selectivity. This paper describes a Pd−B diatomic catalyst that can selectively catalyze the photosynthesis of glycine via C−N coupling reaction between waste poly(ethylene terephthalate)-derived ethylene glycol and nitrate, achieving a glycine yield of 2.9 mmol g cat −1 h −1 with a selectivity of 92%. Mechanistic investigations reveal that ethylene glycol is photo-oxidized to glycolaldehyde at the hole-rich B site, while nitrate is photo-reduced to NH 4 + /NH 3 at the electron-rich Pd site. Subsequently, glycolaldehyde undergoes C−N coupling with NH 4 + /NH 3 , and further photo-oxidized to form glycine. The Pd−B diatomic site more effectively stabilizes the glycolaldehyde intermediate, resulting in a more favorable C−N coupling pathway than metal oxide and enhancing glycine selectivity. Thus, we show a catalytic system for selective glycine photosynthesis by precisely regulating the reaction pathways of key intermediates.
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PubMed
高影响因子
Functional Materials Letters
·
2019
·
IF 1.388
Lin Zhao,Yanzhao Xie,Qiuyu Lin,Rongze Zheng,Yong Diao
A series of composite catalysts of C, N and P co-doped TiO 2 were prepared by sol-gel method, using a biomass (soluble starch) dopant. The samples were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), fourier transform infrared (FTIR) spectroscopy. The results show that TiO 2 is co-doped with C, N and P by one step. The resulting composite exhibited higher specific surface area, wider visible-light absorption band with respect to the pure TiO 2 . The sample calcined at 400 ∘ C for 2 h with a doping amount of 6 g soluble starch showed the best electrochemical performance. The C, N and P co-doped TiO 2 was also used for the degradation of methylene blue (MB) and degradation ratio was up to 98% in 80 min under visible light irradiation.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2026
·
IF 4.7
Baomin Wang,Haoxiang Yang,Chengcheng Fan,Fei Liu,Wenxin Lu
Alkali-activated materials show excellent capture capacity on heavy metals, but the mechanisms to immobilize heavy metals remain inadequately explored. This work investigated the main hydration product C-A-S-H gels for encapsulation of heavy metals such as Pb(II), Zn(II) and Cd(II). Furthermore, the adsorption behavior and mechanisms of Pb(II) in pore solutions by C-A-S-H were examined. These findings reveal that aluminum is incorporated into the silicon chains of C-S-H in the form of aluminum-oxygen tetrahedra, thereby generating C-A-S-H. The bonding ratio, which depends on the Ca/Si ratio, reaches its peak value of 0.139 when the Ca/Si ratio is 0.9. In highly alkaline environments, amphoteric Pb(II) and Zn(II) form hydroxyl coordination polyhedra, enhancing silicon chain polymerization, whereas Cd(II) is immobilized via ion exchange with Ca(II), resulting in solid solutions. For C-A-S-H with a Ca/Si ratio of 0.6, Pb(II) adsorption occurs predominantly through physical interactions. However, as the Ca/Si molar ratio increases, the effect chemisorption and ion exchange become more significant along with the formation of Pb 8 Ca(Si 2 O 7 ) 3 . C-A-S-H gel with a Ca/Si ratio of 0.9 has the highest Pb(II) adsorption capacity, reaching 92.55 mg/g.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2014
·
IF 2.063
Hai-Peng Xu,Wan-Zhong Lang,Xuan Zhang,Ya-Jun Guo
The charged poly(vinylidene fluoride) (PVDF) membranes were prepared by composite thermally induced phase separation (C-TIPS) method with perfluorosulfonic acid (PFSA) as additive. The results verify that the porosity, surface hydrophilicity and pure water permeation flux ( J W ) increase with the addition of PFSA for the membranes. The highest J W of 507.2 ± 1.2 L/(M 2 H bar) is obtained for the membrane cast at 90 °C. Much higher casting temperature isn’t advantageous to improve J W value for the PVDF membranes. All membranes exhibit negative apparent zeta potential ( ζ app ). The crystallinity in β phase increases as casting temperature increases for all PVDF membranes.
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International Journal of Electrochemical Science
·
2023
·Vol. 6
·期 10
·4700-4713
·
IF 1.5
Lingli Wan,Yonghai Song,Haozhi Zhu,Yu Wang,Li Wang
Cytochrome c (Cyt c ) and horseradish peroxidase (HRP) were co-immobilized on graphene oxide (GO)-chitosan (CHIT) modified Au electrode and the electron-transfer between the two proteins was investigated. The GO-CHIT nanocomposite was assembled on an Au electrode which covered by a mixed self-assembled monolayer of mecraptoundecanoic acid (MUA) and 6-mercapto-1-hexanol (MCH) and coated with Cyt c . The GO-CHIT nanocomposite as a novel electrochemical platform designed by combining the biocompatibility of CHIT and the conductivity of GO was used for the immobilization of the redox enzymes. Based on electrostatic interactions, the Cyt c -HRP/GO-CHIT/Cyt c /MUA-MCH/Au electrode was constructed by a layer-by-layer technique. Electron transfer and electrocatalytic performances of the modified electrode were investigated. Results showed that direct electron transfer has been established for the bi-protein system and the average rate constant of electron transfer k s , (Cyt c - HRP) =2.63 s -1 was larger than those values at the electrodes modified with single protein (k s , (Cyt c ) =1.44 s -1 , ks, (HRP) =1.53 s-1). The bi-protein modified electrode exhibited good electrocatalytic response to reduction of oxygen (O 2 ) and hydrogen peroxide (H 2 O 2 ), suggesting that a third-generation biosensor could be obtained for the detection of O 2 and H 2 O 2 .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Cheng Cheng,Xiaoxian Zang,Wenxiu Hou,Changcong Li,Qing Huang,Xiangang Hu,Chencheng Sun,Yu Zhang,Jun Yang,Fuyuan Ma
The NASICON (Sodium super ion conductor)-type of Na 3 V 2 (PO 4 ) (NVP) has a great potential for energy storage application due to its high voltage plateau, three-dimensional (3D) ionic diffusion channel, perfect thermal stability, and high structural robustness. Here, Na 3 V 2 (PO 4 )-based composites with 3D porous carbon skeleton structure were synthesized via hydrothermal methods . After a series of hydrolysis and polymerization processes, transparent colloid mainly containing (NH 4 ) 4 Na 2 V 10 O 28 phase was formed. The 3D porous hydrogel with the (NH 4 ) 4 Na 2 [V 10 O 28 ]·10H 2 O phase was produced by adjusting the reaction time. The product has a lamellar structure , and its ion is suitable to grow the nanosheets , and the present PO 4 3- groups may be distributed in the (NH 4 ) 4 Na 2 [V 10 O 28 ]·10H 2 O phase of the interlayer structure, leading to the enhanced electronic conductivity . The 3D porous Na 3 V 2 (PO 4 )/C (NVP/C) with the size of 100–200 nm particles can be used as cathode for sodium ion batteries . The NVP/C delivers a specific capacity of 62.1 mAh g −1 at 10 C. The excellent stability of NVP/C can be obtained with 98% capacity retention after 140 cycles at 1 C. After 2000 cycles (5 C), the capacity is still 80.4 mAh g −1 , with the capacity retention of about 86%. Our encouraging results may boost further studies of SIBs device by smart engineering of the electrode materials.
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2016
·Vol. 44
·期 2
·224-231
·
IF 0.566
Chang-Ping RUAN,Ke-Long AI,Le-Hui LU
Magnetic adsorbents have recently been extensively investigated and applied in the field of water purification, because of their magnetic characters which are advantageous for the separation and recycle of these materials. Unfortunately, common magnetic materials are unstable and prone to dissolution in acid environment, thus limiting their practical applications in wide pH range, particularly in acidic condition. Therefore, it is highly imperative to exploit a novel magnetic adsorbent that is acid-resistant, to simplify separation process during the water purification. In present work, an acid-resistant magnetic Co/C nanocomposite was synthesized by using ZIF-67 as both template and precursor. The ZIF-67 was carbonized in an argon atmosphere at 800 °C for 1 h, and then treated with acid. Upon calcination at an appropriate temperature in inert atmosphere, the generated Co nanoparticles were uniformly wrapped by graphite layers, due to the graphitization of carbon upon the catalysis effect of Co. The formed graphite layers were able to protect the Co particles from oxidation and acid environment, thus resulting in the generation of an acid-resistant magnetic adsorbent that can be applied in a wide pH range (pH 1–13). Remarkably, the as-synthesized magnetic Co/C nanocomposite demonstrated excellent adsorption performance towards two typical organic dyes (rhodamine B and malachite green) over a wide pH range. The adsorption isotherms of rhodamine B and malachite green on Co/C nanocomposite were well fitted with the Langmuir model. Impressively, the maximum adsorption capacities towards rhodamine B and malachite green were estimated to be 400.0 and 561.8 mg g −1 , respectively, far exceeding many previously reported adsorbents. Moreover, the adsorbent could be easily regenerated by washing with ethylene glycol (EG), suggesting its excellent reusability. Even after 5 cycles of reuse, no obvious capacity degradation was observed. Furthermore, practical application of the magnetic adsorbent was demonstrated by the removal of organic dyes from domestic wastewater with a superior removal efficiency of higher than 97%.
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