MOLECULES
·
2023
·Vol. 28
·期 8
·3430
·
IF 4.6
Hongtao Guo,Xiaofan Ma,Qiqi Lv,Chunmei Zhang,Gaigai Duan
Compared with traditional metal materials, carbon-based materials have the advantages of low density, high conductivity, good chemical stability, etc., and can be used as reliable alternative materials in various fields. Among them, the carbon fiber conductive network constructed by electrospinning technology has the advantages of high porosity, high specific surface area and rich heterogeneous interface. In order to further improve the conductivity and mechanical properties of pure carbon fiber films, tantalum carbide (TaC) nanoparticles were selected as conductive fillers. The crystallization degree, electrical and mechanical properties of electrospun TaC/C nanofibers at different temperatures were investigated. As the carbonization temperature increases, the crystallization degree and electrical conductivity of the sample also increases, while the growth trend of electrical conductivity is markedly slowed. The best mechanical properties of 12.39 MPa was achieved when the carbonization temperature was 1200 °C. Finally, through comprehensive analysis and comparison, it can be concluded that a carbonization temperature of 1200 °C is the optimum.Keywords:electrospinning;electrical property;pyrolysis temperature;carbonization
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL POLLUTION
·
2023
·
IF 8.9
Yuxuan Zhang,Jun Luo,Biao Feng,Hongxia Xu,Yuanyuan Sun,Xueyuan Gu,Xin Hu,Mu Naushad,Bin Gao,Hongqiang Ren
MXenes are considered as an emerging class of two-dimensional (2D) adsorbent for various environmental applications. In this work, two different morphologies of Ti 3 C 2 T x MXene (multilayer (ML-Ti 3 C 2 T x ) and delaminated titanium carbide (DL-Ti 3 C 2 T x )) were prepared through mild in situ HF etching and further delamination . The structural differences between the two were explored with a focus on their effects on the performance and mechanism of removing heavy metals from water. In comparison to ML-Ti 3 C 2 T x , DL-Ti 3 C 2 T x had more oxygen-containing functional groups, higher specific surface area (19.713 vs. 8.243 m 2 /g), larger pore volume (0.135 vs. 0.040 cm 3 /g), higher maximum Pb(II) adsorption capacity (77.0 vs. 56.68 mg/g), but lower maximum Cu(II) adsorption capacity (23.08 vs. 55.46 mg/g). Further investigation revealed that the removal of Pb(II) by the MXenes was mainly controlled through electrostatic attraction and surface complexation mechanisms, while Cu(II) was removed mainly through surface reduction by Ti-related groups. Because delamination of ML-Ti 3 C 2 T x increased the surface area and surface functional groups, DL-Ti 3 C 2 T x became a better sorbent for Pb(II) in water. During sonication, however, delamination inevitably led to partial oxidation of Ti 3 C 2 T x nanosheets and thus weakened the reducing ability of DL-Ti 3 C 2 T x for Cu(II) in water. Nevertheless, both ML- and DL-Ti 3 C 2 T x not only exhibited excellent heavy metal adsorption capacity under different solution conditions, but also showed good reusability. Findings of this study indicate that Ti 3 C 2 T x MXenes are promising adsorbents for treating heavy metal pollutants in water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Zhigang Yi,Xiangnan Chen,Shaoxi Zhang,Ruohao Li,Qiong Tang,Guangjun Gou
Conventional design for the electromagnetic absorbing material often struggles to balance the structural stability and electromagnetic loss. Interfacial regulation is key to reconciling structural stability and electromagnetic absorption. Thus, it is proposed in this paper to construct carbonized polyaniline coated SiC hybrids. Dense interfacial layers are introduced to achieve enhanced thermostable electromagnetic absorptions. Whether the hybrids maintain stable electromagnetic absorption after aging through calcination were investigated. The C-PANi/SiC exhibits significantly boosted electromagnetic absorption with the optimal reflection loss reached −43.70 dB at 4.40 GHz. Furthermore, C-PANi/SiC demonstrates excellent thermal stability, and the optimal reflection loss of C-PANi/SiC-3 h maintains −50.58 dB with broaden effective absorption bandwidth of 4.76 GHz under the thickness of 1.8 mm. The confined orientation of C-PANi on SiC and strong interfacial hybridizations are found out critical to the synergistically improvement in thermostable electromagnetic absorption. This work provides guidance to developing novel multi-functional electromagnetic absorbing materials.
研究领域:
材料科学
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电磁学
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纳米技术
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高分子科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Le Lu,Zhaofeng Chen,Yaotong Song,Yue Wang,Qiankang Zheng,Lixia Yang,Zhiyuan Ma,Yiran Lin,Shuangquan Guo,Yuming Xing,Xingpu Wang,Junling Liu,Mengan Cao
The rapid and efficient repair of ceramic matrix composite damaged by foreign objects is a significant technical challenge for extending the service life of aerospace components. In this study, a localized repair method combining gel casting and flash sintering technologies is proposed for repairing SiC f /SiC with penetration damage. The repair process involves the regularization of the damaged area using high-pressure water jet treatment, the construction of a scaffold via gel casting, and the achievement of localized densification and reinforcement through flash sintering. Experimental data demonstrate that the porosity of the repaired region is reduced from an initial 62.25–8.57 %, while the density is increased from 2.09 g/cm³ to 2.28 g/cm³. Additionally, the flexural strength of the repaired samples reaches 112.83 MPa, equivalent to 51 % of the original material's strength. This technique minimizes thermal damage, enhances precision, and provides a practical pathway for extreme remanufacturing of damaged ceramic matrix composites.
研究领域:
材料科学
·
航空航天工程
·
陶瓷基复合材料修复技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·Vol. 47
·期 15
·21459-21465
·
IF 4.527
Xianwei Su,Xiaojia Shang,Yusi Che,Shaolong Li,Jianxun Song,Jilin He
Homogenous ZrC x O y powders have been successfully synthesized by in-situ electro-reduction of solid ZrO 2 –C composite precursors in molten CaCl 2 . The effect of applied cell voltage and molar ratio of ZrO 2 to C on preparation of ZrC x O y were investigated. The reduction pathway of the composite electrode was studied based on the analysis of intermediate products using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that ZrO 2 is firstly converted to CaZrO 3 . The resulting CaZrO 3 is then reduced to ZrC x O y . The ZrC x O y formation is dramatically influenced by electrolysis voltage and molar ratio of ZrO 2 to C: a higher cell voltage and lower molar ratio of the ZrO 2 to C are more preferable for the formation of ZrC x O y powder. Homogenous ZrC x O y powders with particle size of ~100 nm are synthesized by ZrO 2 /C starting elemental powders in CaCl 2 molten salt at 1123 K for more than 3 h, when the cell voltage is 3.0 V and the molar ratio of the ZrO 2 to carbon starting materials is 1:1.0.
研究领域:
材料科学
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无机非金属材料
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电化学合成
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粉末冶金
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固态化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Sachin Mane,Yu-Xia Li,Xiao-Qin Liu,Lin-Bing Sun
The use of porous carbons for selective CO2 separation attracts increasing attention. Owing to low thermostability of porous polymers, low yield is the major concern of porous carbons. To obtain porous carbons with high yield, the development of thermostable porous polymers is highly expected. Herein, high yielded (70% for 700 °C and 64% for 800 °C) Sn-doped porous carbons (SnPCs) have been constructed through KOH-assisted carbonization of Sn-containing polymer. Notably, SnPC-700 (218.5 mg·g–1) demonstrates higher CO2 adsorption capacity than the reference sample prepared without KOH, SnPC-700r (188.3 mg·g–1), indicating the importance of KOH-assisted activation. Carbonization temperature has an effect on the adsorption capacity of resultant materials, and high carbonization temperature leads to better adsorption capacity on CO2. SnPC-800 is able to capture 242.8 mg·g–1 of CO2, which is better than some benchmarks including BILP-7 (193.0 mg·g–1), PAF-1–450 (196.4 mg·g–1), and FCTF-1 (205.5 mg·g–1). More importantly, SnPC-800 demonstrates good selectivity of CO2 over CH4 (31.1). Thus, high yield and good performance upon CO2 adsorption capacity and selectivity over CH4 make SnPCs attractive candidates for the removal of CO2 from natural gas.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Kejing Wu,Chunyan Yang,Yingming Zhu,Junbo Wang,Xueting Wang,Changjun Liu,Yingying Liu,Houfang Lu,Bin Liang,Yongdan Li
Molybdenum carbide catalysts over activated carbon with different crystal phases were synthesized under controllable carburization atmospheres and temperatures for transfer hydrogenation of Kraft lignin in ethanol to aromatic monomers. Single α-MoC1–x and crystal transformation of α-MoC1–x to β-Mo2C are observed under a CH4/H2 mixture and H2 carburization atmospheres, respectively. The mixed crystal phases of α-MoC1–x and β-Mo2C with different crystallinities under a N2 carburization atmosphere exhibit higher activity with a maximum aromatic yield of 0.5163 g/g Kraft lignin when carburized at 700 °C. The dehydrogenation reaction and Kraft lignin hydrogenation are proposed to explain the synergistic effect of β-Mo2C, base, and α-MoC1–x for the base-promoted transfer hydrogenation process in ethanol, which is confirmed by in situ Fourier transform infrared analysis. This highly efficient process is suitable for the conversion of different lignin feedstock.
研究领域:
化学工程
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催化
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可再生能源
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2022
·Vol. 66
·期 2
·623-633
·
IF 8.64
Wang Yuqing,Si Wenping,Tan Haotian,Xie Zhiqiang,Wang Liqun,Di Lu,Liang Ji,Hou Feng
Polymeric carbon nitride (PCN) has received extensive attention in suspension photocatalysis, whereas the preparation of high-quality PCN film is still at an initial stage, limiting its practical application in photoelectrochemical (PEC) systems. Herein, an integrated molten and vapor condensation route is realized using small molecule precursors dicyandiamide (DCDA) and thiourea (TU) to form PCN film photoelectrode with high performance. The in-situ deposition route endows the PCN film with a composite structure including a thick porous zone with suitable thickness for light absorption and thin compact zone with a higher C/N ratio for better charge transportations. The growth of the specific film and the functions of precursors DCDA and TU are investigated in detail. Owing to the unique condensation route and film structure, this PCN film exhibits excellent performance in PEC water splitting with a photocurrent density of ca. 140 µA cm −2 in 0.1 mol L −1 NaOH electrolyte at 1.23 V RHE , which is competitive or higher than the results of the reported PCN photoanodes prepared by the molten-mediated method and thermal vapor condensation. The integrated molten and vapor condensation strategy is enlightening for comprehending the growth of PCN photoelectrodes.
研究领域:
材料科学
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化学工程
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能源技术
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 48
·41696-41706
·
IF 3.289
Guangyan Tian,Wenbo Wang,Li Zong,Yuru Kang,Aiqin Wang
Palygorskite (PAL) has been widely used for adsorption removal of dyes from wastewater, but the dye-loaded PAL is usually discharged as solid waste because it is hardly regeneratable by conventional elution processes. As the aim was to efficiently utilize the dye-loaded PAL waste, we employed a facile one-pot hydrothermal process to transform the spent methyl violet (MV)-loaded PAL into multifunctional ternary palygorskite/carbon/Ag nanoparticles (PAL/C/AgNPs) nanocomposites in the assistance of AgNO3. The MV-loaded PAL serves as a carbon precursor, reducer of Ag(I) and supporter of the in situ formed AgNPs. Structure characterizations confirmed that the MV dye was transformed into carbon species, and AgNPs were formed on the PAL with good dispersion, and the addition of Ag(I) ions promoted carbonization of the MV molecules. The as-prepared nanocomposites exhibited excellent adsorption and catalytic performance. Adsorption evaluation showed that the nanocomposite prepared at 5 mass% of AgNO3 dosage gives the best adsorption properties, and 99.2% of methylene blue (MB), 86.9% of MV, 68.7% of chlortetracycline hydrochloride (CTC) and 46.2% of tetracyclines (TC) were rapidly removed from 100 mg L−1 of the aqueous solution using 0.5 g L−1 of the adsorbent. The removal ratio increased with increasing dosage of adsorbent, and the minimum usage amounts of adsorbent for the thorough removal of MB, MV, CTC and TC molecules were 1.0 g L−1, 1.2 g L−1, 3.5 g L−1 and 4.5 g L−1, respectively. Moreover, the nanocomposites could rapidly catalyze the conversion of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) within 6.5 min with a catalytic rate constant of 0.0120 s−1, and the catalytic activity is still retained after 8 cycles of reuse. In addition, the nanocomposite can be re-generated into new adsorbents by the same hydrothermal process after adsorption of organic matters, which open a new sustainable avenue to efficiently utilize waste dye-loaded PAL and develop new adsorption and catalysis materials.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Huan Jiao,Xinyu Guo,Chaofeng Zhang,Sha Wang,Wenjuan Wu,Yongcan Jin,Zhiqiang Liang,Bo Jiang
With natural hierarchical porous and anisotropic cellular structure, wood yields a great opportunity for solar-driven water desalination but is limited in interfacial evaporation efficiency due to its inherent low photothermal conversion. Although the photothermal materials decoration and the high-temperature carbonization have been proposed, these methods often lead to poor interfacial compatibility and thermal management. Herein, a space-confined carbonization strategy of wood cellular structure was developed to construct an all-in-one solar-driven evaporator for efficient water desalination and evaporative power generation. The gradient carbonization of cellular structure caused by immersed wood into concentrated H 2 SO 4 endows wood surface with improved photothermal conversion efficiency (91.6 %), and the interior cellular structure with natural hydrophilic (hemi)cellulose enables rapid water transportation. As a result, the space-confined carbonized wood exhibits high evaporation performance, with the evaporation rate up to 2.1 kg m −2 h −1 under 1 sun. The concentration difference of ions caused by water evaporation can also achieve power generation, with the timing current and voltage up to 34 mA and 1187 mV, respectively. In addition, the H 2 SO 4 is reusable without affecting the evaporation stability. The developed space-confined carbonized wood also demonstrates good adaptability to various water environment. This feasible space-confined carbonization strategy provides a new sight to construct all-in-one wood-based solar-driven evaporators for improving the water desalination and evaporative power generation performance.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2022
·Vol. 74
·期 5
·1958-1968
·
IF 2.597
Luo Yinbo,He Dongfeng
Indirect carbonation as an efficient CO 2 sequestration strategy has received extensive attention in recent years. This study proposes a two-step leaching indirect carbonation process using NH 4 Cl and CH 3 COOH in order to combine the advantages of the two leaching agents to obtain a better experimental outcome. The experimental results show that NH 4 Cl has a high pH buffering capacity, which can increase the pH of the mixed leachate to an alkaline level. Among the 21 groups of mixed leachate, 17 were alkaline (pH > 7). The mixed leachate has a high Ca 2+ ions carbonation rate under low CH 3 COOH concentration conditions, and the carbonation rate of steel slag with a particle size of < 38 μm can reach 60% when the CH 3 COOH concentration is 0.1 M. SEM imaging showed that the CaCO 3 formed by the reaction exists in a hexagonal calcite crystal form.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2019
·
IF 5.026
Tao Wang,Xiqing Liu,Donglai Han,Changchang Ma,Maobin Wei,Pengwei Huo,Yongsheng Yan
This work focused on the utilization of biological extract for the preparation of lignin-based carbon composites materials and used in the field of photocatalysis . A straightforward one-step carbonization way has been developed to prepare vanadium-doped lignin-based carbon/Bi 2 O 3 composites photocatalyst by using sodium lignosulfonate as the carbon source and catalyst. The application of lignin as the carbon source to form photocatalyst support tends to control the uniform distribution. At the same time, sodium lignosulfonate as the catalyst could break down the BiVO 4 during carbonization process. A series of characterizations demonstrated the BiVO 4 was transformed into Bi 2 O 3 and vanadium-doped lignin-based carbon. The possible synthesis process was proposed. Moreover, the novel V-doped carbon/Bi 2 O 3 composites photocatalyst displayed higher photocatalytic activity than bare BiVO 4 . A possible photocatalytic mechanism was also discussed. This work provided new insight into the lignin-based carbon materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）