JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Qi Li,Jianliang Xie,Jin Hu,Xin Wang,Chengyong Yu,Shaoliang Jiang,Peng Liu,Chengli Sun,En Li,Longjiang Deng
The dielectric layer plays a key role in regulating electromagnetic wave broadband scattering based on meta-surface technology. Herein, the physical properties of composite powder, prepared by spray drying of CaO-B 2 O 3 -SiO 2 (CBS) glass-ceramic powder and Al 2 O 3 in different mass ratios, are systematically investigated. Meanwhile, a high enthalpy atmospheric plasma spraying equipment is utilized to prepare CBS/Al 2 O 3 composite coatings , and the morphology, physical properties and dielectric properties of the composite coating are analyzed. The XRD and DSC data of the composite coating reveal that the crystallization behavior of β-CaSiO 3 and CaB 2 O 4 gradually disappear with the increase of Al 2 O 3 content. Hence, only CaAl 2 Si 2 O 8 phase is observed during heat treatment. The experimental results confirm that the dielectric properties of CBS/Al 2 O 3 composite coating conform to the rule of mixture for composite materials. Also, the dielectric properties are affected by porosity and crystallization rate.
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JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yongjie Ding,Chunxiang Zhao,Pengcheng Zhang,Yali Cui,Yahong Chen,Jianping Xie,Weiwu Song,Zengchen Liu,Yongliang Ban,Ge Liu,Juan Yang
A new acylhydrazone fluorescent sensor ( VN62 ) with excited intramolecular proton transfer (ESIPT) characteristics has been designed and synthesized through condensation of o -vanillin with 6‑hydroxy-2-naphthoic hydrazide for selective detection of Al 3+ in aqueous medium. The structure of the VN62 sensor was characterized by various techniques such as 1 H and 13 C NMR and mass spectrometry, and also confirmed by single crystal X-ray diffraction. The VN62 sensor showed a remarkable fluorescence enhancement response to Al 3+ over a broad pH range in a nearly 100 % aqueous solution without interference by most of tested metal ions and anions. Through fluorescence titration and a Job's plot experiment, the binding stoichiometry of VN62 with Al 3+ was found to be 1:1. The limit of detection of VN62 toward Al 3+ was determined as 39.6 nM and the binding constant was 2.66 × 10 4 M −1 . Comprehensive analyses by HR-MS, 1 H NMR and density functional theory calculations illustrated that the VN62 sensor coordinated with Al 3+ , forming a stable trigonal bipyramid structure complex, which blocked the ESIPT and photoinduced electron transfer processes and simultaneously promoted an intramolecular charge transfer process, thereby leading to strong cyan fluorescence. Moreover, VN62 -loaded test strips were successfully applied for rapid and visual detection of Al 3+ . Furthermore, the VN62 sensor was used to visualize Al 3+ in plants and live cells. The results indicated that the VN62 sensor has great potential for detecting Al 3+ in biological systems.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zongyi Deng,Xueyuan Yang,Xiaobo Yu,Zhixiong Huang,Di Zhu,Minxian Shi
Carbon fiber/phenolic resin composites (CF/Ph) have attracted great interests in the field of thermal protection materials for their characteristics of high specific strength and easy manufacturing. However, CF/Ph are inherently susceptible to oxidation failure at elevated temperatures. In this study, a novel Al-coated carbon fiber/boron phenolic resin ceramizable composite modified with TiB 2 and B 4 C was fabricated by an impregnating and compression molding route. Thermal stability, flexural strength , microstructure and phase evolution of the resulting ceramizable composite were studied. The residue yield at 1400 °C and flexural strength after treated at 1400 °C for 15min was 90.4% and 53.1 MPa, respectively, which was increased by 15.9% and 532.1% than that without ceramizable fillers. Surface defects generated by matrix pyrolysis were well healed, and PyC and carbon fibers were covered with dense ceramic layers while the fracture surface was covered with relatively continuous ceramic layers without visible pores. Multiphase ceramics composed of TiB 2 , TiO 2 , TiC and PyC were identified. Furthermore, oxidation failure and anti-oxidation mechanism was revealed based on the aforementioned characterizations and thermodynamic calculation results. Oxidation resistance got enhanced markedly for synergistic effects of oxygen consuming, carbon fixation, oxygen barrier and endothermic effect, which were derived from ceramization reactions between TiB 2 , B 4 C, O 2 , Al and PyC.
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ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 6
·925-933
·
IF 1.6
Tang Tingfan,Li Xiaohui,Zhu Jiaqing,Huang Wenyi,Cheng Hao,Feng Jun
In this paper, a polymer monolithic column based on poly (Butyl methacrylate-co-ethylene glycol dimethacrylate) (poly (BMA-co-EDGMA)) doped with MIL-53(Al) metal–organic framework (MOF) was prepared using an in situ polymerization method. The characteristics of MIL-53(Al)-polymer monolithic column were studied through scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS), X-ray powder diffractometry (XRD), and nitrogen adsorption experiment. Due to its large surface area, the prepared MIL-53(Al)-polymer monolithic column has good permeability and high extraction efficiency. Using MIL-53(Al)-polymer monolithic column for solid-phase microextraction (SPME), coupled to pressurized capillary electrochromatography (pCEC), a method for the determination of trace chlorogenic acid and ferulic acid in sugarcane was established. Under optimized conditions, chlorogenic acid and ferulic acid have a good linear relationship ( r ≥ 0.9965) within the concentration range of 50.0–500 µg/mL, the detection limit is 0.017 µg/mL, and the relative standard deviation (RSD) is less than 3.2%. The spike recoveries of chlorogenic acid and ferulic acid were 96.5% and 96.7%, respectively. The results indicate that the method is sensitive, practical, and convenient. It has been successfully applied to the separation and detection of trace organic phenolic compounds in sugarcane samples. Graphical abstract
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TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·169-184
·
IF 0
Li Yingxia,Li Jiaxin,Yang Xiao,Wang Xitao,Xu Yanhong,Zhang Lihong
A series of PtCuCeMgAl quintuple hydrotalcite-like compounds with different Ce contents were synthesized by one-pot method. After calcining and reduction, CeO 2 -modified Mg(Al)O-supported Pt–Cu alloy catalysts were obtained. To understand the effect of Cu and Ce, the structure and physico-chemistry properties of the catalysts were characterized and analyzed, and the catalytic behaviors were investigated in a direct dehydrogenation of propane to propene. The results show that the Pt 4+ , Cu 2+ , and Ce 3+ ions can be incorporated into the brucite-like layers and the Ce content significantly affects the interaction strength between Pt and Cu and the dehydrogenation performance of propane. Under the reaction conditions, the highest propane conversion (45%) with 89% selectivity to propene and a 40% propene yield were achieved with a 0.3 wt% Ce-modified PtCu/Mg(Al)O catalyst. The improved catalytic performance is related to the easy formation of Pt–Cu alloy phase, excellent resistance to sintering, and coke deposits of active components modified by CeO 2 .
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jinpeng Hu,Dezhi Zhang,Wenbao Li,Yan Li,Guorong Shan,Min Zuo,Yihu Song,Ziliang Wu,Lie Ma,Qiang Zheng,Miao Du
Marine biofouling, resulting from the adhesion of marine organisms to ship surfaces, has long been a significant issue in the maritime industry. In this paper, we focused on utilizing soft and hydrophilic hydrogels as a potential approach for antifouling (AF) coatings. Acrylic acid (AA) with a polyelectrolyte effect and N-(3-sulfopropyl)-N-(methacryloxyethyl)-N,N-dimethylammonium betaine (SBMA) with an antipolyelectrolyte effect were selected as monomers. By adjusting the monomer ratio, we were able to create hydrogel coatings that exhibited low swelling ratio in both fresh water and seawater. The Al(OH)3 nanoparticle, as a physical cross-linker, provided better mechanical properties (higher tensile strength and larger elongation at break) than the chemical cross-linker through the dynamic coordination bonds and plentiful hydrogen bonds. Additionally, we incorporated trehalose into the hydrogel, enabling the repair of the hydrogel network through covalent-like hydrogen bonding. The zwitterion compound SBMA endowed the hydrogel with excellent AF performance. It was found that the highest SBMA content did not lead to the best antibacterial performance, as bacterial adhesion quantity was also influenced by the charge of the hydrogel. The hydrogel with appropriate SBMA content being close to electrical neutrality exhibits the strongest zwitterionic property of PSBMA chains, resulting in the best antibacterial adhesion performance. Furthermore, the pronounced hydrophilicity of SBMA enhanced the lubrication of the hydrogel surface, thereby reducing the friction resistance when applied to the hull surface during ship navigation.
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JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Haoran Pan,Lu Tian,Xinning Huang,Jinxiao Dou,Jianglong Yu,Xingxing Chen,Shuangyin Wang
Zinc-air batteries (ZABs) exhibit exceptional energy density and inherent safety yet necessitate cost-effective and stable catalysts to bolster the cathode oxygen reduction reaction (ORR). This work presents a nitrogen-doped porous carbon (NPC) structure with highly dispersed aluminum-based active sites that demonstrate remarkable performance in ORR catalysis. Advanced analytical tools, including time-of-flight secondary ion mass spectrometry (ToF-SIMS), confirm the presence of Al-N4-N motifs with axial N-ligands, significantly augmenting catalytic efficiency. In-situ surface-enhanced Raman spectroscopy (SERS) reveals the rate-limiting step to be the initial proton-coupled electron transfer process, evidenced by the delayed emergence of the ∗OOH band compared to the ∗O 2 band. High-resolution scanning electrochemical microscopy (SECM) is employed to decipher the local reactivity distribution across varying potentials and temperatures, elucidating the electrochemical characteristics. Incorporating this synthesized material as the cathode in a liquid-state ZAB yields a capacity of 750 mAh g −1 and a power density of 144 mW cm −2 , alongside commendable cyclic stability. Furthermore, the constructed all-solid-state ZAB demonstrates outstanding cycling stability under diverse bending conditions, emphasizing its robustness and potential for flexible energy storage applications. This work represents a significant advancement in the field, paving the way for the development of more efficient, reliable, and cost-effective ZAB technologies.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Siqi Wu,Jianshan Chen,Rong Guo,Haoyi Tong,Shanshan Zong,Zhifang Diao,Yeyan Qin,Yuangen Yao
Efficient production of dimethyl carbonate (DMC) from methyl nitrite (MN) carbonylation based on PdCu/NaY zeolite catalysts is highly desired for industrial applications. The introduction of boron species into the initial gels of NaY synthesis is a cost-effective modification strategy for boosting the catalytic performance. It not only introduces trace amounts of framework boron but also regulates the distribution of framework aluminum (Al F ) species. Most importantly, the synergistic effect of framework boron and Al-rich region significantly enhanced the metal − support interaction, thus promoting more electrons to be transferred from metal to support. This strategy allows the palladium active species to remain in an electron-deficient state more easily. The carbon monoxide (CO) adsorption and the critical intermediate species *CH 3 COO are more easily formatted on PdCu/NaBY catalyst, which leads to superior weight-time yields (WTY DMC up to 1507·g·kg cat − 1 ·h − 1 ), and CO conversion to DMC (C CO up to 83 %). Our design is of great importance for developing metal-zeolites catalysts, which motivates the industrial application of Pd-based catalysts in the MN carbonation of DMC field.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Chaorong Chen,Hongyan Zeng,Moyu Yi,Gaofei Xiao,Sheng Xu,Shigen Shen,Bo Feng
The photocatalytic performance of Ag 3 PO 4 is severely restricted by the photocorrosion and high charge carrier recombination rate. In order to overcome these defects, a novel Ag 3 PO 4 /calcined Zn-Al layered double hydroxides (APMO) heterostructure photocatalyst was fabricated via in-situ growth of Ag 3 PO 4 particles on the surface of calcined Zn-Al layered double hydroxides (MMO). The crystal structures, morphologies, optical and photoelectrochemical properties of the as-synthesized samples were characterized using various techniques, and its photocatalytic activity for tetracycline (TC) degradation was evaluated under simulated solar light irradiation. Obviously, all the APMO composites demonstrated much higher photocatalytic performances for TC degradation than pure Ag 3 PO 4 . Especially, the APMO70 showed the highest photocatalytic activity, which was almost about 49.3 times as high as that of pure Ag 3 PO 4 , and the degradation efficiency was still above 89% after 5 cycles. The improved photocatalytic performance and stability of APMO were ascribed to the efficient charge transfer and strong interfacial contact between Ag 3 PO 4 and MMO. The possible photocatalytic mechanisms involving the charge transfer pathway and reactive species generation during the process of TC degradation were also discussed. Finally, the aquatic toxicity of TC was assessed using Chlorella vulgaris ( C. vulgaris ) as an ecological indicator, and the result suggested that the as-prepared APMO composite can effectively diminish the aquatic toxicity of TC.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Jiahui Li,Dongwei Ma,Gui Lu,Dong Fu,Carlos Ponce de León,Jia Hong Pan
Al-ion batteries (AIBs) represent promising multivalent-ion battery alternatives to Li-ion batteries (LIBs). Exploration of cathode materials is the key to improving the electrochemical performance of AIBs. Here we demonstrate a promising AIB cathode candidate based on two-dimensional graphitic carbon nitride (g-C3N4) nanosheets with reversible de/embedding of [AlCl4]− anions in its special layered porous structure during the cyclic charge/discharge process. To address the sluggish ion/charge transportation kinetics that is inherently present in AIBs due to the intrinsically low conductivity of g-C3N4, we optimize different synthetic precursors of g-C3N4 including dicyandiamide, urea, and melamine and, further, develop a facile method for uniformly coating a N-doped carbon (N–C) coating layer on the optimal g-C3N4 derived from dicyandiamide. The resultant AIBs consisting of the g-C3N4@N–C cathode and Al metal anode in the AlCl3/[EMIm]Cl electrolyte exhibit an initial capacity of ∼54.9 mAh·g–1 at 0.2 C with a high Coulomb efficiency ∼99.9%, and they possess long-term cycling over 200 cycles. The underlying charge/discharge process of AIBs, revealed by the ex situ X-ray diffraction and scanning electron microscopy analyses, involves the extraction/insertion of Al species (mainly Al3+, AlCl4–, and Al2Cl7–) into the g-C3N4 crystal lattices with the formation of intermediate Al8C3N4 and (ClCN)3.
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高影响因子
MOLECULES
·
2020
·Vol. 25
·期 4
·897
·
IF 3.267
Qian-Chun Zhang,Guang-Ping Xia,Jun-Yi Liang,Xiao-Lan Zhang,Li Jiang,Yu-Guo Zheng,Xing-Yi Wang
In this study, a novel monolithic capillary column based on a NH2-MIL-53(Al) metal–organic framework (MOF) incorporated in poly (3-acrylamidophenylboronic acid/methacrylic acid-co-ethylene glycol dimethacrylate) (poly (AAPBA/MAA-co-EGDMA)) was prepared using an in situ polymerization method. The characteristics of the MOF-polymer monolithic column were investigated by scanning electron microscopy, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray diffractometry, Brunauer-Emmett-Teller analysis, and thermogravimetric analysis. The prepared MOF-polymer monolithic column showed good permeability, high extraction efficiency, chemical stability, and good reproducibility. The MOF-polymer monolithic column was used for in-tube solid-phase microextraction (SPME) to efficiently adsorb trace sulfonamides from food samples. A novel method combining MOF-polymer-monolithic-column-based SPME with ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) was successfully developed. The linear range was from 0.015 to 25.0 µg/L, with low limits of detection of 1.3–4.7 ng/L and relative standard deviations (RSDs) of < 6.1%. Eight trace sulfonamides in fish and chicken samples were determined, with recoveries of the eight analytes ranging from 85.7% to 113% and acceptable RSDs of < 7.3%. These results demonstrate that the novel MOF-polymer-monolithic-column-based SPME coupled with UHPLC-MS/MS is a highly sensitive, practical, and convenient method for monitoring trace sulfonamides in food samples previously extracted with an adequate solvent.Keywords:monolithic capillary column;metal-organic framework;sulfonamides;solid-phase microextraction;ultra-high performance liquid chromatography-tandem mass spectrometry
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JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Lei Li,Hengji Liu,Yuanyuan Wang,Gang Wang,Yongde Guo,Weimin Kang
Reasonable construction of low migration energy barrier and continuous proton transfer channel is the key to improving the performance of composite proton exchange membranes. In this paper, we prepared a novel bimetallic MOFs (MIL-(Cr Al)–NH 2 ) nanofibers (MCANs) consisting of Cr and Al elements by electro-blown spinning method (EBS) and hydrothermal synthesis, and subsequently introduced them into non-fluorinated sulfonic acid polymer sulfonated polysulfone (SPSF) matrix to obtain composite proton exchange membranes (MCANs@SPSF). Importantly, MCANs successfully constructed relatively long-range continuous unsaturated metal site proton transfer channels provided by the Cr-based MOFs, thereby reducing the proton migration energy barrier in the MCANs@SPSF, which confirmed by the density functional theory (DFT) calculation. In detail, DFT studies indicated that the migration energy barrier between H + and MCANs was 1.677 eV, while that of single Al-based MOF (MAN) and single Cr-based MOF (MCN) were 1.879 eV and 1.762 eV respectively. The existence of efficient low migration energy barrier and continuous proton transfer channels made the proton conduction efficiency of MCANs@SPSF greatly improved, that was under the condition of 80 °C and 100 % RH, the proton conductivity of MCANs@SPSF reached the maximum value of 0.358 S cm −1 and the power density reached 104 mW cm −2 . Moreover, MCANs@SPSF-5 displayed best DMFC durability performance with only 14.65 % voltage loss under 24h test. In addition, due to the acid-base pair interaction between MCANs and SPSF enhanced the interface binding force between the two phases, meanwhile, the pore structure of MOFs also had a certain adsorption effect on methanol, thus reducing the methanol permeability, and the addition of 5 wt% MCANs in SPSF was tested to reduce the methanol permeability to 5.53 × 10 -7 cm 2 s −1 . Overall, this work provided a new strategy for construction of low migration energy barrier and continuous proton transfer channels, which was beneficial for the development of high performance proton exchange membranes.
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