Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 40
·15450-15456
·
IF 8.262
Pei Wang,Peiyuan Xiao,Shuxian Zhong,Jianrong Chen,Hongjun Lin,Xi-Lin Wu
Bamboo-like carbon nanotubes (b-CNTs) were synthesized via a low-cost one-pot approach by using FeCl3 and self-assembled colloidal polymer nanoplates as precursors. The resulting b-CNTs were applied as both the adsorbent and the catalyst for the removal of bisphenol A (BPA) from aqueous solutions. The maximum adsorption capacity of BPA on the b-CNTs calculated by using the Langmuir model is 328.6 mg g−1 at 303 K. Thermodynamics studies revealed that the adsorption was spontaneous and exothermic. With the synergistic effect of adsorption and catalysis by the b-CNTs, BPA (70 mg L−1) was almost completely removed (over 97%) at pH 7.0 within 80 min after the adsorption–oxidative degradation process. The b-CNTs also displayed an excellent reusability for the catalytic oxidation of BPA (initial concentration of 70 mg L−1) with the degradation ratio remaining at 84% after 5 cycles. Moreover, the b-CNT catalysts can be easily recycled by using an external magnet and regenerated by simply washing. This study not only presents a cost-effective method of using magnetic nanocarbons for the cleanup of pollutants, but also demonstrates the potential application of the b-CNTs as both an adsorbent and a catalyst.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2019
·
IF 15.548
Meijia Liu,Shuchun Zhao,Xuezhang Xiao,Man Chen,Chenghua Sun,Zhendong Yao,Zhencan Hu,Lixin Chen
Magnesium hydride (MgH 2 ) offers large capacity for hydrogen storage , but poor thermodynamics and kinetics for releasing hydrogen. In this work, the novel 1D bamboo-shaped carbon nanotubes (BCNTs) are firstly used as carriers for the self-assembly of MgH 2 (denoted as MgH 2 @BCNTs). The high specific surface area (262.3 m 2 g -1 ) and large diameter (over 80 nm) of BCNTs contribute to extremely high loading capacity (76.8 mass fraction), small particle size (15–20 nm) and uniform distribution of MgH 2 nanoparticles (NPs). The well-defined MgH 2 @BCNTs shows remarkably improved thermodynamics and kinetics for H 2 adsorption and desorption. In particular, it starts to release hydrogen at about 220 °C, near 170 °C lower than that of the commercial MgH 2 , as well it tends to be hydrogenated even at a relatively low temperature of 100 °C by absorbing 3.56 wt% H 2 . Moreover, a reversible capacity up to 5.79 wt%, including the “dead weight” of BCNTs, and is well maintained after 10 cycles. The dehydrogenation E a and Δ H of MgH 2 @BCNTs can be reduced to 97.97 kJ/mol and 68.92 kJ/mol, which are 111.24 kJ/mol and 6.07 kJ/mol lower than those of the commercial MgH 2 , respectively. By high pressure densification treatment, the MgH 2 @BCNTs system achieves an exceptional volumetric capacity up to 65.90 g/L without obvious performance degeneration, resulting from the special structure of BCNTs with inner intervals which works as supports under ultra-high pressure of 750 MPa. Our innovative design of 1D BCNTs supporting MgH 2 NPs with high loading weight offers new strategy to synchronously improve the gravimetric and volumetric capacity, as well as the hydrogen storage kinetics and thermodynamics of the nanoconfinement system in the future.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Yincong Yang,Lang Liu,Yakun Tang,Yang Zhang,Dianzeng Jia,Lingbing Kong
Bamboo-like carbon nanotubes containing sulfur (BCNT-S) were prepared through the carbonization and the activation of sulfonated polymer nanotubes in CO 2 . The BCNT-S showed a remarkably high specific capacitance of 259 F g −1 at the current density of 1 A g −1 , while 97.7% of its initial capacitance was retained after 1000 cycles at the current density of 5 A g −1 . In contrast, amorphous carbon without S had a specific capacitance of 129 F g −1 at 1 A g −1 , which was only about half of that of the BCNT-S. Therefore, the introduction of a trace amount of sulfur (1.66%) could greatly enhance the specific capacitance of carbon nanotubes (CNTs). In addition, the high specific capacitance and excellent cycling stability of the BCNT-S were also benefited from its high specific surface area and bamboo-like tubular morphology.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Jinglin Li,Kailun Chen,Li Lin,Siyu Han,Fanzhi Meng,Endian Hu,Weikai Qin,Yuchen Gao,Jianguo Jiang
The escalating levels of plastic waste and energy crises underscore the urgent need for effective waste-to-energy strategies. This study focused on converting polypropylene wastes into high-value products employing various iron-based catalysts and microwave radiative thermal processing. The Al–Fe catalysts exhibited exceptional performance, achieving a hydrogen utilization efficiency of 97.65% and a yield of 44.07 mmol/g PP. The gas yields increased from 19.99 to 94.21 wt % compared to noncatalytic experiments. Furthermore, this catalytic system produced high-value bamboo-shaped carbon nanotubes that were absent in other catalysts. The mechanism analysis on catalytic properties and product yields highlighted the significance of oxygen vacancies in selecting high-value products through two adsorption pathways. Moreover, the investigation examined the variations in product distribution mechanisms between conventional and microwave pyrolysis, in which microwave conditions resulted in 4 times higher hydrogen yields. The technoeconomic assessment and Monte Carlo risk analysis further compared the disparity. The microwave technique had a remarkable internal rate of return (IRR) of 39%, leading to an income of $577/t of plastic with a short payback period of 2.5 years. This research offered sustainable solutions for the plastic crisis, validating the potential applicability of commercializing the research outcomes in real-world scenarios.
研究领域:
环境科学
·
能源工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Yameng Jiao,Qiang Song,Xuemin Yin,Liyuan Han,Wei Li,Hejun Li
Due to the limited electromagnetic wave (EMW) loss capacity and agglomeration, carbon black (CB) gradually fails to meet the increasingly harsh demanding conditions. Herein, defect-rich bamboo-like carbon nanotubes (CNTs) were grown on CB by the process of chemical vapor deposition . CNTs prepared in situ on CB can assist it to build a developed multilevel conductive network and introduce plentiful CB/CNTs nano-interfaces. What's more, the defects that accompany the growth of CNTs endow CNTs with a moderate conductivity and good impedance matching, thereby causing an effective microwave absorption (MA). Meanwhile, the high-density defects on CNTs can induce dipole polarization to further strengthen the EMW loss ability. The influence of CNTs with different growth time on MA performance has been explored. Profiting from the structural merits, the synthesized CB-CNT with CNTs growth time of 40 min exhibits the optimal absorbing property, which has the minimum reflection loss of -53.6 dB and maximum effective absorption bandwidth of 4.1 GHz with the thickness of 2.7 mm, covering almost the entire X band. The introduction of defect-rich CNTs significantly enhances the EMW loss ability of CB, which provides a rational strategy for the design of high-efficient microwave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yaokun Fu,Zhichao Yu,Sanyang Guo,Yuan Li,Qiuming Peng,Lu Zhang,Shikui Wu,Shumin Han
Catalyst doping modification has become an important strategy to solve the high desorption temperature and sluggish kinetics issues of magnesium hydride (MgH 2 ) for further commercial application. Herein, we report a novel strategy by exploiting a catalyst with the “magnesophilic” transition metal and “magnesiphobic” carbon material to construct a MgH 2 -catalysts-carbon layer hydrogen storage material, where the bimetallic NiFe nanoparticles are supported atop the bamboo-like carbon nanotubes (NiFe@CNT) via calcination. The experimental results show that the built MgH 2 -NiFe@CNT composite can absorb 4.06 and 3.25 wt% H 2 at 373 and 348 K, respectively, while the milled-MgH 2 almost no longer absorbs H 2 and takes only 0.82 wt% even at 423 K. More importantly, the initial desorption temperature of the MgH 2 -NiFe@CNT composite reduces to 498 K by 122 K in contrast to the milled-MgH 2 , and the dehydrogenation activation energy decreases from 151.8 to 49.7 kJ mol −1 . Ex situ structural characterization and theoretical calculation show that the synergistic effects of the “hydrogen pump” role of Mg 2 Ni/Mg 2 NiH 4 and “hydrogen gateway” role of α-Fe, as well as the good dispersion function of carbon nanotubes generated in situ from the NiFe@CNT, contribute the excellent hydrogen storage properties of the MgH 2 -NiFe@CNT composite. This study provides new insights into the modification of MgH 2 by carbon-supported transition metal catalysts.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2023
·
IF 9.1
Bowen Cui,Chengguo Wang,Yanxiang Wang,Chengjuan Wang,Haotian Jiang,Mengfan Li,Zhenhao Xu
Cu nanoparticles were loaded on the surface of continuous carbon fibre (CF) and catalysed the growth of carbon nanotubes (CNTs) by continuous catalytic chemical vapour deposition . The results of Cu and traditional catalysts were contrastively studied in terms of surface morphology , microstructure and mechanical properties . It is reflected that the CNTs grown from Cu catalysts are in suitable distribution, with unique bamboo‐like structure and higher graphitisation degree. The carbon nanotube–carbon fibre utilising Cu catalyst has 53.0% higher interfacial shear strength than the pristine fibre, and shows advantage in tensile strength over its counterparts of traditional catalysts. Above all, a “loading–catalysis–reinforcing” mechanism was established, which theoretically and systematically explains how the nature of different catalyst metals affects the various stages in the process of growing CNT on the surface of continuous CF. This research expands the catalyst options, and develops the catalysis mechanism that offers an important theoretical guidance for the process optimization.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2025
·
IF 7.9
Lihui Xiao,Yaqiang Li,Peixia Yang,Qiang Lv,Xiangyu Lu,Hao Xu,Ruopeng Li,Huiling Zhang,Shengbo Yang,Anmin Liu,Dan Wang,Jinqiu Zhang,Maozhong An
Carbon nanotubes' (CNTs) preparation and formation mechanisms are of great interest. To improve their performance in the oxygen reduction reaction (ORR), a post-treatment to add active centers is required. This study presents a simple method using a molten-salt template to self-assemble bamboo-shaped CNTs (B-Fe-N-C) with highly stable Fe-N 4 (Fe-pyridinic-N 4 ) sites. By analyzing the evolution of high-temperature materials and the intermolecular bonding process, the formation mechanism of B-Fe-N-C follows a two-dimensional material synthesis--bonding--self-assembly--growth mechanism. Impressively, B-Fe-N-C exhibits superior ORR performance (a half-wave potential of 0.868 V) and stability (only 3 mV attenuation after 10000 cycles of accelerated durability test) in alkaline medium. Density functional theory calculations demonstrate that Fe-Pyridinic-N 4 sites can lower the energy barrier for ORR. Furthermore, Comsol multiphysics simulations confirm the significant enhancement of oxygen mass transfer by bamboo-shaped B-Fe-N-C. Therefore, B-Fe-N-C is employed in zinc-air batteries, resulting in nice discharge performance and high peak power density.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Lufang He,Zhuo Liu,Yuchi Zhang,Le Han,Yan Xu
Nitrite is commonly found in the natural environment and in everyday human activities. However, excessive nitrite consumption can potentially harm human health. Consequently, it is crucial to develop a reliable and sensitive method for nitrite detection. In this work, trichloroacetic acid functionalized Cl-Fe-MIL-88B metal-organic framework is obtained through nucleophilic reaction between animated Fe-MIL-88B and trichloroacetic acid, which is then annealed with melamine in an N 2 atmosphere to produce the Fe/Cl/N triply-doped bamboo-like carbon nanotubes (CNTs) wrapped with Fe 3 C nanoparticles. Owing to the effective doping of Fe/Cl/N elements, the charge distribution and chemical activity of the bamboo-like structure are tailored, greatly improving the conductivity and facilitating electron transfer of the composite for potential electrocatalytic reaction. The Fe 3 C nanoparticles wrapped inside the CNTs contribute to expose more active sites and provide effective surface area. Accordingly, the Fe/Cl/N doped bamboo-like structure modified glassy carbon electrode shows excellent electrochemical nitrite sensing properties with a high sensitivity of 1060 µA cm −2 mM −1 , a low detection limit of 0.61 µM in a wide linear concentration range of 5–5000 μM, as well as good anti-interference and long-term stability. Also, the electrochemical sensor has a satisfactory recovery rate for detecting nitrite ions in spiked milk samples. This work proposes a simple precursor chlorination and pyrolysis strategy to obtain metal-filled bamboo-like structure with high electrical conductivity and electrocatalytic properties, endowing great potential in food safety and environment monitoring.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Shasha Wang,Qing Wang,Wuxin Liu,Yuli Wei,Yan Wang,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu
Carbon materials are still the most widely studied anode materials for potassium ion batteries (PIBs) attributed to their advantages of wide source, controllability, and environmental friendliness. In this paper, a bamboo-like tubular nitrogen-doped carbon material (CNC) was prepared by using g-C 3 N 4 as the precursor and transition metal salt as the catalyst and template. CNC has the advantages of a bamboo-like tubular structure, rich nitrogen content, and large layer spacing. As anode of PIBs, CNC can deliver an impressive initial reversible capacity of 488.6 mAh/g at 0.1 A/g. At a high current density of 1 A/g, CNC still retains a reversible capacity of 291 mAh/g after 1000 cycles. The excellent performance of CNC anode can be due to the porous bamboo-like tubular structure that promotes K ions diffusion and the rich nitrogen content that provides abundant active sites for K ions.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2018
·Vol. 6
·期 1
·309-316
·
IF 5.106
Yan Cheng,Jieming Cao,Hualiang Lv,Huanqin Zhao,Yue Zhao,Guangbin Ji
Carbon material systems, in particular carbon nanotube (CNTs)-based composites, have been demonstrated as potential electromagnetic absorbers if some difficulties, e.g., poor dispersion and lower skin-depth can be solved. To address the above barriers, amorphous bamboo-like carbon nanotubes (BCNTs) with controlled length/diameter ratios were catalyzed by tunable magnetic CoxNi1−x alloys through a facile in situ approach in this research. Such BCNT configuration can suppress the inverse microcurrent intensity and present boosted impedance matching behavior. Meanwhile, an improved dispersion state of BCNTs was achieved as compared to that of common graphited CNTs. Furthermore, reflection loss is highly influenced by the aspect ratio of BCNTs. After tailoring BCNTs to proper diameter, the sample of BCNTs/Co0.2Ni0.8 almost exhibited complete absorption focusing on X-band at low filler ratio of 20 wt%. This composite may be used as a light and efficient microwave absorber in X-band.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Haotian Jiang,Yanxiang Wang,Chengjuan Wang,Yanqiu Feng,Deli Yang,Yue Sun,Jinghe Guo,Bohan Ding,Shichao Dai,Dongming Liu,Chengguo Wang
Carbon aerogels have revolutionized the design of advanced electromagnetic wave absorbers by offering low density, multi-functionality, and versatility. However, traditional carbon aerogels face limitation due to their high electrical conductivity and reliance on single loss mechanism, which hinders their widespread applications. To overcome these challenges, a series of multilayered hierarchical CoNi/bamboo-like carbon nanotubes (BCNTs)/carbon nanofiber (CNFs) aerogels are prepared using directional freeze-drying, hydrothermal methods, and catalytic chemical vapor deposition. The effects of layer spacing and thermal growth on the microwave absorption properties of the hybrids are investigated by varying the content of aramid nanofibers and growth temperature. The synergistic effect of dielectric and magnetic loss optimizes the electromagnetic parameters and impedance matching of the samples, which obtains an optimal minimum reflection loss of −80.30 dB at only 2.07 mm. Furthermore, the composite aerogel demonstrates an ultra-wide effective absorption bandwidth of 6.60 GHz at 2.28 mm. The practical application capabilities of the samples are evaluated through theoretical analysis. Besides, the as-prepared aerogels exhibit excellent thermal insulation properties and the ability to adsorb light oils. This study presents an attractive strategy for fabricating CoNi/BCNTs-modified carbon aerogel absorbers, which hold great promise for applications in electromagnetic protection and thermal management devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）