ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 5
·5094-5110
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IF 2.914
Zhang Mengjiao,Zhu Liyun,He Changhua,Xu Xiaojun,Duan Zhengyang,Liu Shuli,Song Mingyao,Song Shumin,Shi Jiemei,Li Yu’e,Cao Guangzhu
In this study, the novel adsorbent PVA-TA-βCD was synthesized via thermal cross-linking between polyvinyl alcohol and β-cyclodextrin. The characterization methods SEM-EDS, FTIR, and XPS were adopted to characterize the adsorbent. The effect of pH, contact time, initial concentrations, and temperature during the adsorption of Pb(II), Cd(II), and Mn(II) onto the PVA-TA-βCD was also investigated. In a single-component system, the data fitted well to pseudo-second-order, and film diffusion and intra-particle diffusion both played important roles in the adsorption process. As for isotherm study, it showed a heterogeneous adsorption capacity of 199.11, 116.52, and 90.28 mg g −1 for the Pb(II), Cd(II), and Mn(II), respectively. Competition between the ions existed in a multi-component system; however, owing to the stronger affinity of the PVA-TA-βCD for Pb(II) relative to Cd(II) and Mn(II), the Pb(II) adsorption onto the PVA-TA-βCD was less affected by the addition of the other metals, which could be effectively explained by the hard and soft acid and base theory (HSAB). Furthermore, PVA-TA-βCD showed good reusability throughout regeneration experiments.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
CARBON
·
2026
·
IF 12.7
Huan Guo,Wenhao Dou,Ruifeng Li,Bingzhu Wang,Yonghui Yu,Yong She,Yongzhong Zhao,Jianjun Sha
It is crucial to address the challenges for low-temperature densification and interfacial reactions during the fabrication of multi-element ultra-high temperature ceramic matrix composites. In this paper, C sf /(Hf, Ta)B 2 -(Hf, Ta)C-SiC composites were prepared via reactive hot-press sintering at low temperatures. The intrinsic connection between the fiber content, microstructure, and mechanical behavior of the composites was elucidated. The results indicated that the ultrasonic dispersion combining with fast hot-press sintering effectively promoted the uniform dispersion of C sf in the matrix and achieved densification at 1700 °C. The composites exhibited an undamaged fiber-matrix interface without observable interfacial phase, demonstrating that low-temperature preparation effectively prevented fiber degradation from interfacial reactions. Compared to the unreinforced ceramics, the composites showed decreased flexural strength and fracture toughness, yet possessed higher work of fracture and larger critical crack size. This indicated that fiber addition improved the damage tolerance and structural reliability by inhibiting the catastrophic brittle fracture behavior inherent to monolithic ceramics. The composite with 20 vol% C sf offered the best balance of strength, toughness and non-catastrophic failure behavior. The flexural strength and fracture toughness were 260.6 MPa and 4.82 MPa m 1/2 , respectively. Download: Download high-res image (531KB) Download: Download full-size image
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Huan Guo,Bingzhu Wang,Ruifeng Li,Cheng Su,Jixiang Dai,Yong She,Yongzhong Zhao,Jianjun Sha
Low-temperature sintering and phase/microstructure tailoring of multi-element ultra-high temperature ceramics remain challenging, restricting the improvement of mechanical properties and the development of ultra-high temperature ceramic materials. In this work, a novel low-temperature reactive sintering technology was used to tailor the content of multiple borides and carbides in (Hf, Ta)B 2 -(Hf, Ta)C-SiC ceramics. It was found that the introduction of borides promoted the densification process of multi-phase ceramics. With the increase of borides content, the grain size of multi-phase ceramics gradually increased. The introduction of moderate amount borides helped to form a uniformly refined microstructure. When the molar ratio of borides to carbides was 2:1, the flexural strength and fracture toughness of multi-phase ceramics were the highest, which were 487.57 ± 38.3 MPa and 5.04 ± 0.09 MPa·m 1/2 , respectively. The main strengthening and toughening mechanisms included pullout of (Hf, Ta)B 2 grains and crack deflection.
研究领域:
材料科学
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陶瓷
·
机械工程
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固态物理学
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产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2015
·
IF 0
Gang Chen,Chun Wei Gong,Chun Lin Fu,Xiao Dong Peng,Wei Cai,Rong Li Gao,Xiao Ling Deng
(Sr1-xBax) 2(Nb0.9Ta0.1) 2O7 (SBNT) ceramics were prepared by solid state reaction. The crystal structure of SBNT ceramics, surface morphology and dielectric properties were studied using XRD, SEM and LCR instrument analyzer, respectively. The results show that the grain size decreases with increasing Ba concentration, and all samples show single phase, no second phase can been observed. Addition of Ba ion can improve the dielectric properties of SBN ceramics. The dielectric constant increases first, then decreases; the maximum value (εr=97) can be obtained at x=0.1, the dielectric constant changes slightly with increasing wide frequency.
研究领域:
材料科学
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电子工程
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DOI
Advanced Electronic Materials
·
2019
·Vol. 5
·期 10
·1900552
·
IF 6.312
Li Yang,Hao Wu,Wenfeng Zhang,Xun Lou,Zijian Xie,Xu Yu,Yuan Liu,Haixin Chang
Room temperature ferromagnetic semiconductors remain one of the most puzzling issues to be solved in tens of years. Nowadays, 2D ferromagnetic transition metal dichalcogenides (TMDCs) nanosheets attract continuous interest due to their exceptional electronic structure and properties. Here, it is identified that semiconducting 2H-phase MoTe 2 few/mono-layer mixed nanosheets present a room temperature ferromagnetic property with Curie temperature above 400 K, although the MoTe 2 bulk counterpart shows diamagnetic properties. The origin of such observed room temperature ferromagnetism is attributed to the combination of their structural defects including Te vacancies, disorders, and amorphous imperfections and edge-states caused by reduced dimensionality. Moreover, a distinct enhancement of ferromagnetic properties at room temperature is revealed by a non-magnetic Ta doping strategy. Such structural defects and edge-states modulated ferromagnetism offers a feasible strategy to search for more robust room temperature ferromagnetic TMDCs nanosheets, which is essential to explore novel electronic and spintronic devices where both carrier charge and spin freedom can be controlled.
研究领域:
凝聚态物理
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材料科学
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纳米科技
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自旋电子学
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半导体物理
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DOI
高影响因子
POWDER METALLURGY
·
2019
·
IF 1.149
Jiaxin Li,Yuhong Chen,Yongquan Li,Zhangjun Bai,Kang Wang
Alloys with composition of Ta-10 wt.% W and Ta-10 wt.% W-6 wt.% Al, respectively, were prepared by the hot-press sintering process. The oxidation behaviour at 900°C and 1000°C was studied. The oxidation weight gain curves of the Ta–10%W alloy followed the linear law and the final oxidation product was Ta2O5 solid solution. Meanwhile, due to the addition of Al, the oxidation weight gain curves of the Ta–10%W–6%Al alloy followed the parabolic law. The final oxidation products at 900°C formed a dense outer layer Al2O3 and an inner layer. However, after being oxidised at 1000°C, the oxidation products included Al2O3, AlTaO4 and Ta22W4O67. Since the dense Al2O3 oxide film was consumed by the generation of AlTaO4, the inward diffusion of oxygen cannot be prevented. The oxidation resistance degraded at 1000°C. The addition of Al significantly improved the oxidation resistance of the Ta-W-based alloy system.
研究领域:
材料科学
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金属学
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Haoxi Jiang,Xinyi Ni,Angjiong Jiang,Guochao Yang,Lingtao Wang
Zr-β zeolites were modified with second metals to catalyze the conversion of ethanol/acetaldehyde to 1,3-butadiene. The incorporation of Ta increases the Lewis acidity of Zr-β zeolite, resulting in higher catalytic activity than that of In, Y and Ce. Furthermore, the Zr-β zeolite that was first incorporated with Zr and then Ta with a Ta/Zr molar ratio of 1.5 exhibited greater catalytic activity of 57% conversion and 75% selectivity. Activity descriptors were proposed to calculate the reactivity of key reaction steps, which served as evidence that Ta incorporation enhances the aldol condensation and MPV reduction reaction activity, thus improving catalytic performance.
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Yongke Tan,Junhui Liu,Yujing Li,Qi Wang,Weibo Zhou,Yuhui Ao,Ming Li
The high strength and toughness of Carbon Fiber-Reinforced Polymers (CFRPs) are the main requirements for their properties in various fields. Herein, the “soft-rigid-soft” structure has been designed by us to achieve the aim of the improvement for the CFRP strength and toughness simultaneously. The soft-rigid-soft structural interface layer of CF was firstly constructed by carbon nanotubes (CNT) and Tannin/Aminopropyl isobutyl POSS (TA/NH 2 -POSS). The interfacial shear strength (IFSS) of the modified carbon fiber composite was 111.94 MPa, which was 84.08 % higher than that of the untreated fiber (60.81 MPa). Moreover the interlaminar shear strength(ILSS) and impact strength were increased by 50.43 % and 80.37 %. Enhancement of interface performance is mainly ascribed to CNT and TA/NH 2 -POSS, because they can effectively which is more effective to consume energy and decentralize stress. In this paper, the strength and toughness of CFRPs ware effectively improved by the in-depth and detailed design of the “soft-rigid-soft” multi-scale structure.
研究领域:
材料科学
·
力学
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Yuxin Zou,Guoqiang Liu,Hanxin Wang,Kang Du,Jinglun Guo,Zhenling Shang,Ruisheng Guo,Feng Zhou,Weimin Liu
Conductive hydrogels have attracted widespread attention in the fields of biomedicine and health monitoring. However, their practical application is severely hindered by the lengthy and energy-intensive polymerization process and weak mechanical properties. Here, a rapid polymerization method of polyacrylic acid/gelatin double-network organohydrogel is designed by integrating tannic acid (TA) and Ag nanoparticles on conductive MXene nanosheets as catalyst in a binary solvent of water and glycerol, requiring no external energy input. The synergistic effect of TA and Ag NPs maintains the dynamic redox activity of phenol and quinone within the system, enhancing the efficiency of ammonium persulfate to generate radicals, leading to polymerization within 10 min. Also, ternary composite MXene@TA-Ag can act as conductive agents, enhanced fillers, adhesion promoters, and antibacterial agents of organohydrogels, granting them excellent multi-functionality. The organohydrogels exhibit excellent stretchability (1740%) and high tensile strength (184 kPa). The strain sensors based on the organohydrogels exhibit ultrahigh sensitivity ( GF = 3.86), low detection limit (0.1%), and excellent stability (>1000 cycles, >7 days). These sensors can monitor the human limb movements, respiratory and vocal cord vibration, as well as various levels of arteries. Therefore, this organohydrogel holds potential for applications in fields such as human health monitoring and speech recognition.
研究领域:
材料科学
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生物医学工程
·
健康监测
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Guangyong Zeng,Yongcong Liu,Qingquan Lin,Shengyan Pu,Size Zheng,Micah Belle Marie Yap Ang,Yu-Hsuan Chiao
Industrial development resulted to an increase in discharge of hazardous oily wastewater with multi-component, which gravely threatens human health and the ecosystem. This is a huge challenge ushered in membrane technology. Recently, two-dimensional material, MXene has been demonstrated as a potential candidate for the construction of functional membranes. A novel TA-ZIF-8@MXene metal–organic framework (MOF) composite membrane has been fabricated and exploited for oily wastewater treatment. The composite membrane (T-M4) exhibited an excellent water flux (5347.36 L·m −2 ·h −1 ) after the incorporation of ZIF-8 modified by tannic acid (TA) nanoparticles. Moreover, the MOF-MXene composite membrane possessed an excellent chemical stability and high oil/water emulsion separation performance. The experimental results showed that the rejection ratios of T-M4 composite membrane for three different oil/water emulsions reached more than 98%. Furthermore, the chemically stable TA-ZIF-8@MXene/CA composite membrane showed an excellent performance having more than 84% flux recovery ratio (FRR) during multi-cycle oil/water emulsion filtration with neutral, acidic, alkaline, and salty media. In addition, molecular dynamics simulations were used to reveal the separation mechanism of the composite membrane. The investigation successfully applied MXene membrane materials to micron-level separation, which provided the reference for the application of MXene in O/W separation.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Xiao-Wei Luo,Zi-Lu Zhang,Wan-Ting Lin,Wan-Long Li,Si-Yuan Zhang,Zi-Jun Zhang,Jin-Bo Li,Zhi-Kang Xu,Ling-Shu Wan
Thermally stable thin-film composite (TFC) nanofiltration (NF) membranes are essential for high-temperature separation in various industrial applications. Herein, we present a rapid and scalable surface modification of polyvinylidene fluoride (PVDF) ultrafiltration membrane using tannic acid (TA) and 2-aminopropyltriethoxysilane (APTES), which can be used as the substrate membrane for the preparation of thermally stable NF membranes. The modified PVDF substrate shows enhanced mechanical strength and thermal stability, with tensile strength rising from 1.5 to 4.7 MPa, decomposition temperature increasing from 459 to 482 °C, and a coefficient of thermal expansion (CTE) reduced by 36.4%. These improvements ensure the structural integrity and strong adhesion between the substrate and polyamide layers, thereby further improving the reliability of the TFC NF membrane during long-term operation under high-pressure and high-temperature conditions. Consequently, the PVDF-based TFC NF membranes sustain >97.5% MgSO 4 rejection and remarkable water permeance (42.1 LMH/bar) during 100-h operation at 70 °C. This rapid and scalable modification method provides a practical route toward the fabrication of robust PVDF-based TFC NF membranes for high-temperature separation.
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DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2025
·
IF 5
Wang Guoqiang,Zhang Mengke,Shi Longqing,Qi Chao,Zhao Zhenxiao,Hu Hongliang,Jin Yujie,Hu Jing
Long-chain polyesters were prepared by melt polymerization using tetradecanedioic acid (TA) and aliphatic diols containing C2-10 as raw materials. The materials were characterised using a range of analytical techniques, including tensile testing, rheological testing, dynamic mechanical analysis (DMA), wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), gel permeation chromatography (GPC), and thermal gravimetric analysis (TGA). An investigation was conducted to ascertain the impact of diol chain length on a number of characteristics, including mechanical properties, crystalline structures, chemical composition, thermal stability, and thermal transition properties. All polyesters had high weight-average molecular weights (> 57000 g/mol). In addition, the crystallization temperature and melting temperature were affected by the chain length of diols. Poly(ethylene tetradecanedioate) (PETd) had a higher crystallization temperature (69.1 °C) and melting temperature (89.0 °C) compared to the other four polyesters, which may be due to its short-chain structure and the kink structures. All polyesters have the same crystal structure like polyethylene. In addition, poly(ethylene tetradecanedioate) (PETd), poly(butylene tetradecanedioate) (PBTd), and poly(octenyl tetradecanedioate) (POTd) exhibited polyethylene-like mechanical properties with comparable tensile strength and elongation at break. It is anticipated that bio-based polyesters will prove to be a highly promising material.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
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