Energy Technology
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2018
·Vol. 6
·期 11
·2273-2281
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IF 3.175
Peng Chen,Suhui Lu,Chao Yang,Zi He,Xuli Chen,Kunkun Guo
The molten salt activation containing different oxysalts are proposed to activate the ordered mesoporous carbons loading on graphene layers (OMC/G). The effects of different oxysalts activations on the structures of OMC/G are thoroughly investigated by scan electron microscopy (SEM), small angle X-ray scattering (SAXS), Raman spectroscopy and nitrogen adsorption-desorption at 77 K. The structures of these carboneous materials are related with the oxidizing nature of these oxysalts. By using weak oxysalt of K 2 CO 3 , the original structure of OMC/G is almost kept together with the appearance of a lot of micropores and mesopores. The electrochemical performances of OMC/G after different oxysalts activation are also studied for supercapacitor applications. OMC/G after weak oxysalt of K 2 CO 3 based electrode results in the highest specific capacitance up to 332.5 F g −1 at a current density of 1.0 A g −1 , which is higher than those after both KOH activation (276.8 F g −1 ) and the other three oxysalts activation. Moreover, OMC/G-K 2 CO 3 shows an excellent cycling stability with no capacitance loss over 5000 cycles. The molten salt activation would be potentially applied to activate the porous carbons for supercapacitor applications.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Chuyi Ni,Junlong Huang,Xintong Xie,Yueru Shi,Juan Zheng,Gangfeng Ouyang
Ordered mesoporous carbons (OMCs) are a kind of remarkable adsorbents in environment area due to high surface area, controllable pore size and superior stability. However, the inherent hydrophobicity and strong π-π interaction make OMCs have an advantage for the adsorption of nonpolar pollutants, leading to great demands for the development of new-type OMCs with outstanding adsorption efficiencies towards polar pollutants. The zirconium and nitrogen co-doped ordered mesoporous carbon (Zr/N-OMC) was obtained by directly carbonizing the composites of phenolic resin and UiO-66-NH 2 , with uniform mesopore structure, large surface area (583 m 2 g −1 ) and widely dispersed heteroatoms . Due to these prominent properties, the Zr/N-OMC was fabricated as high-performance solid phase microextraction coating. The results proved that the doping zirconium and nitrogen could act as active sites to interact with polar pollutants, resulting in fast adsorption rate and enhanced adsorption capacity. Therefore, the high-performance Zr/N-OMC-coated fiber was coupled with gas chromatography-mass spectrometry to establish sensitive analytical method for the detection of trace phenols from real water samples. This work would open up a new avenue for simple and efficient modification of OMC with enhanced adsorption performance to expand applications.
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
FUEL
·
2015
·
IF 3.52
Yawei Shi,Xiangwen Zhang,Guozhu Liu
Both activation and surface oxidation were employed to tailor the textural and surface properties of a typical ordered mesoporous carbon (CMK-3) for better adsorptive desulfurization performance. The amount of small micropores increased dramatically upon activation, while abundant surface functionalities were introduced by surface oxidation. Thanks to the abundant mesopores present in the carbons, a quasi-equilibrium situation for DBT adsorption from model fuels could be reached rapidly in less than 30 min, and the adsorption amounts at 5 min were equal to more than 95% of the equilibrium values. Moreover, the adsorption amount of DBT was increased by up to 121% with the introduction of small micropores and surface functionalities. Further experiments were designed to demonstrate that the adsorption amount is depended on both textural and surface properties.
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 MATERIALS SCIENCE
·
2020
·Vol. 55
·期 15
·6525-6536
·
IF 3.553
Liu Wei,Yuan Hong,Ke Yihu
A new carbon precursor, soybean oil, was applied to the synthesis of ordered mesoporous carbon (SOMC) using an inverse replication method in conjunction with ordered mesoporous SiO 2 molecular sieves (SBA-15) as a hard template. The effects of different carbonization temperatures (600, 700, and 800 °C) on the microstructure, degree of order of the pore structure, specific surface area, and pore size of the SOMC were investigated. Scanning electron microscopy showed that the SOMC was composed of rods approximately 1 μm in length and 0.5 μm in diameter. Transmission electron microscopy indicated that carbonization temperatures in the range of 600–800 °C produced, the SOMC samples having a suitably ordered mesoporous structure. N 2 adsorption–desorption analysis confirmed that the Brunauer–Emmett–Teller specific surface area of the SOMC was 882 m 2 /g with a pore diameter of 3.5 nm after processing at 600 °C.
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
ANALYTICAL CHEMISTRY
·
2011
·
IF 5.874
Hongqiang Qin,Liang Zhao,Ruibin Li,Ren’an Wu,Hanfa Zou
Many diseases are characterized by the changes of either glycan structure or glycosylation site of glycoproteins. The glycan profiling can provide the overview of glycosylation in despite of the absence of the glycosylation sites, which in turn simplifies the complexity of disease diagnosis. Herein, we describe a simple method to profile the N-linked glycans by MALDI-TOF MS with the enrichment using oxidized ordered mesoporous carbon, taking advantages of the size-exclusive effect of mesopore against proteins as well as the interaction between glycans and carbon. Twenty four N-linked glycans derived from ovalbumin could be efficiently detected with high signal-to-noise (S/N) ratios and sufficient peak intensities. In the analysis of complex serum samples, 32 N-linked glycans could be profiled, and 5 (4 core-fucosylated glycans) of them were distinguished from liver cancer and healthy samples.
研究领域:
分析化学
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生物医学
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蛋白质组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Hu Xiaopeng,Xi Jiajia,Xia Yuanyuan,Zhao Faqiong,Zeng Baizhao
A space-confined synthesis method is employed for the preparation of a single-layer MoS 2 –boron doped ordered mesoporous carbon nanocomposite. A phenol-formaldehyde resin is used as carbon source to create a confined space for the formation of single-layer MoS 2 . The addition of pluronic F127, as a soft template, suppresses the stacking of MoS 2 layers and makes the composite porous. The nanocomposite is characterized by scanning electron and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The single-layer MoS 2 sheets have a lateral size of about 5 nm and are uniformly embedded in the composite. They possess numerous active edge sites and display a strong synergistic effect with other components. The composite is modified on a glassy carbon electrode, followed by the electrochemical imprinting of theophylline, and the resulting electrode exhibits good electrochemical response to theophylline. The linear response range is 0.01–250 μM by differential pulse voltammetry, and the lower detection limit is 5 nM. It has been successfully applied to the determination of theophylline in spiked tea drink samples.
Single-layer MoS 2 –boron doped ordered mesoporous carbon nanocomposite has large surface area and high catalysis, when coupling with molecularly imprinted polymer the resulting electrode shows highly sensitive and selective response to theophylline.
研究领域:
材料科学
·
分析化学
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药物分析
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2020
·
IF 5.774
Xiaoxiang Cheng,Weiwei Zhou,Daoji Wu,Congwei Luo,Ruibao Jia,Peijie Li,Lu Zheng,Xuewu Zhu,Heng Liang
In this study, ordered mesoporous carbons (OMCs), i.e., CMK-3 and CMK-8 were pre-deposited on ultrafiltration membrane surface to alleviate membrane fouling by organic matter in the water. CMK-3 shows a typical 2D hexagonal symmetrical structure with long straight parallel channels, while CMK-8 exhibits a 3D porous structure with cubic channels. The pre-deposited CMK-3/CMK-8 layers exhibited significantly superior performance for both flux enhancement and fouling mitigation, whereas powdered activated carbon (PAC) showed limited influence. The fouling mechanism was apparently altered by the OMCs pre-deposition layers, and pore blocking always dominated throughout the filtration process without the formation of cake filtration. In comparison with PAC, CMK-3 and CMK-8 were more effective for the rejection of tryptophan-like protein substances, which were the major foulants causing membrane fouling. The effects of pollutant fraction and deposited amount (i.e., 6, 12, 25 and 50 g/m 2 ) were systematically explored, and the results indicated that this technology was more efficient for alleviating the fouling induced by humic acid and bovine serum albumin, whereas ineffective for sodium alginate fouling, and the optimal deposited amount varied with the pollutant fraction. CMK-3 exhibited significantly superior performance than CMK-8, likely due to its long straight parallel channels with lower internal resistance for pollutants adsorption. Both adsorption and size exclusion of the pre-deposited layers contributed to fouling mitigation. These results demonstrate that pre-depositing with OMCs as alternatives to conventional PAC shows promising potential for mitigating membrane fouling in water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2014
·
IF 3.406
Zhenhua Gao,Shaokun Tang,Xili Cui,Songjiang Tian,Minhua Zhang
Ordered mesoporous carbons (OMCs) with hexagonal structure and hydrophobic surface were synthesized via cooperative self-assembly of phenolic resol and surfactant F127 in ethanol, followed by sulfonation with 4-aminobenzenesulfonic acid and isoamyl nitrite. The sulfonated OMCs (S-OMCs) were used as the catalyst for the esterification of oleic acid and methanol to simulate the deacidification of oil materials with high acid values in biodiesel production. The influences of sulfonation conditions including temperature, mass ratio of the reactants and calcination temperature of OMCs on the conversion of oleic acid in the esterification reaction were investigated and the selectivity of this esterification was studied for the first time. It shows that the mesoporous carbon-based solid catalyst exhibits high activity and reusability. The conversion of oleic acid can reach up to 96.25% and the catalyst can be reused for at least nine times without remarkable loss of catalytic activity.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Huan Wang,Xiangjie Bo,Yufan Zhang,Liping Guo
Sulfur-doped ordered mesoporous carbons (OMC-S-X) (X = 1, 2 and 3) with different sulfur contents were synthesized as metal-free electrocatalyst for oxygen reduction reaction (ORR). Transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy-dispersive X-ray spectra (EDX), nitrogen adsorption–desorption, X-ray diffraction (XRD) and X-ray photoelectron spectra (XPS) were employed to confirm the characterizations of OMC and OMC-S. The prepared OMC-S-3 exhibits high electrocatalytic activity, good stability and excellent tolerance to crossover effect for ORR. The high electrocatalytic activity of OMC-S-3 for ORR can be mainly ascribed to the doping of sulfur especially the existence of sulfide groups ( C S C ) which play an important role in promoting the ORR.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2023
·
IF 5.3
Peng Guo,Songling Zhang,Xiuwu Liu,Shijie Zhu,Huimin Li,Jilin Cao
Compared with the synthesis process of the CMK-3 material, the ordered mesoporous carbon (OMC) materials were successfully synthesized by simplifying the synthesis steps. The silica/P123 composite material that had formed nanostructures was not filtered, washed, and calcined to form SBA-15 material, but it was directly used as a hard template to synthesize OMC materials. The self-assembly of block polymers (P123) in the pore space was not removed but directly carbonized as partial carbon source. The template agent (surfactant P123) was not removed but used as part of the carbon source. The synthetic materials exhibited large pore volume, high specific surface area, regular hexagonal pore structures, and good long-range order, which was confirmed by the 77 K N2 adsorption–desorption isotherms, transmission electron microscopy (TEM), and small-angle X-ray diffraction (XRD). The synthetic materials were applied to capture carbon dioxide, and the results of carbon dioxide capture were better than those of the CMK-3 material reported previously. Under the conditions of 3.4 MPa pressure and 275 K temperature, the CO2 capture capacity of the dry synthetic MC-1.5–0.8 material without water was 25 mmol/g at 275 K, which was 1.4 times that of the dry CMK-3 material. In addition, the CO2 capture capacity of the same pre-adsorbed water MC-1.5–0.8 sample with Rw = 3.8 at 3.3 MPa was 47.6 mmol/g, which was 1.9 times that of the dry MC-1.5–0.8 sample.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Haiqing Zhang,Richard Lee Smith,Haixin Guo,Xinhua Qi
Ordered mesoporous carbons (OMCs) functionalized with catalytically-active metals have many potential applications in sulfate radical-based advanced oxidation processes for degrading antibiotics. Cobalt cross-linked ordered mesoporous carbon materials (OMC-Co-Tx) were synthesized through evaporation-induced self-assembly, calcinated at (600 to 800) o C. The OMC-Co-Tx materials were then employed as peroxymonosulfate (PMS) activators for removal of sulfamethoxazole (SMX) from aqueous solutions. OMC-Co-T800 prepared by calcination at 800 °C had a large specific surface area (449 m 2 /g), uniform pore structure (∼4.5 nm) and showed the best performance for activation of PMS. With a dosage of 0.1 g/L OMC-Co-T800 and 0.4 g/L PMS, the functionalized OMC material allowed SMX (10 mg/L) removal of up to 99% in 30 min. The increase of calcination temperature promoted the reduction of cobalt in OMC materials and increased the defects in their structure, resulting in better catalyst behavior. Quenching experiments and electron paramagnetic resonance analyses showed that reactive species of sulfamethoxazole degradation involved in the OMC-T800/PMS system were SO 4 •− , OH, O 2 •− and 1 O 2 . HPLC-MS analyses of degradation intermediates formed in the OMC-Co-T800/PMS system allowed elucidation of four transformation pathways for SMX degradation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Panpan Zhou,Jing Zhang,Hongli Zhu,Lixi Wang,Xiaokang Wang,Zhi Song,Qitu Zhang,Mingxun Yu,Zhihao Liu,Tong Xu,Wanxun Feng,Xia Feng
Ordered mesoporous carbon (OMC) is considered to be a prospective carbon-based material for microwave absorption because of its abundant well-ordered mesoporous structures, high specific surface area, numerous active sites, and facile preparation process. However, its development has been seriously hindered by its poor impedance-matching characteristic. Herein, silica-modified OMC composites with a designable impedance-matching transition layer are successfully fabricated via a self-assembly method and succeeding calcination treatment. In addition, the silica in OMC@SiO2 composites can maintain the mesoporous structure, which facilitates the scattering and reflection of microwaves in the tunnel structure. The as-prepared sample OMC-5@SiO2 exhibits a minimum reflection loss (RL) value of −40.7 dB at 10.8 GHz with 2 mm and an effective absorption bandwidth (RL ≤ −10 dB) of 4.8 GHz with a thinner absorber thickness of 1.5 mm. We believe that the as-prepared OMC@SiO2 composites can be prospective candidates as high-efficiency and lightweight microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
PubMed
高影响因子
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