SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Abuduheiremu Awati,Halidan Maimaiti,Shixin Wang,Bo Xu
Photocatalytic synthesis of ammonia is a kind of compelling and challenging nitrogen fixation method. In this paper, we extract the small-sized graphite-like carbon layer in the coal by organic solvent extraction method using HNO3 pretreated coal as a precursor. Then the coal-based carbon nanosheets (CNs) containing with Ca 2+ , Ti 4+ , Fe 2+ , Al 3+ , Si 4+ , C, N, O and other metal/non-metal ions was obtained under the assistance of the ultrasonication. The composite catalyst Ru/CNs was prepared by in situ loading the ruthenium (Ru) nanoparticles reduced from RuCl3·3H2O onto the as prepared CNs. The structure was characterized and the photocatalytic nitrogen fixation into ammonia performance under ambient temperature and atmospheric pressure was studied. The results show that the composite catalyst Ru/CNs with uniform dispersion of Ru nanoparticles on CNs has excellent photocatalytic nitrogen fixation activity, a nd the NH3 yield reaches 221.3 μmol/L after the reaction for 4 h. At the same time, the as prepared catalyst had quite good stability, and the NH3 yield remained substantially unchanged in 5 cycle experiments.
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
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 33
·13962-13970
·
IF 3.288
Hengdong Ren,Jialin Ma,Jun Zhou,Xiangfeng Shu,Zhenying Liu,Yin Liu,Yan Zhao,Tao Ge,Fanfei Min,Ling Bing Kong
Anthracite-based carbon/Ni3Fe/NiO ternary composites were synthesized by using a microwave radiation method at a frequency of 915 MHz. Phase and elemental compositions of the composites were investigated by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). According to FESEM observations, Ni3Fe and NiO particles are uniformly implanted into grid-like porous structures and interlayers on the surface of anthracite-based carbon. The carbonization was realized at 700 °C, which could be attributed to the presence of a large number of polar molecules in anthracite that responded actively to microwave irradiation. The oxygen-containing functional groups in anthracite-based carbon provide multiple relaxation processes. Therefore, the composites exhibited a minimum reflection loss of −51.66 dB at 5.52 GHz, with effective absorption covering the S and C bands. Importantly, this result shows a facile method for preparing coal-based carbon/magnetic powder, which utilizes the rapid reaction of microwave radiation.
研究领域:
材料科学
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电磁学
✓ 已验证
DOI
高影响因子
CARBON
·
2024
·
IF 10.5
Mingjin Du,Channa Wang,Xue Liu,Xiangdong Ding,Changsheng Xiang
The findings of the research indicate that coal-derived carbon dots (CDs), produced through top-down methods, exist as a blend of graphene quantum dots (GQDs), carbon quantum dots (CQDs), and carbon nanodots (CNDs). Within this mixture, numerous individual particles are dispersed, each containing multiple sp 2 -carbon domains, suggesting the presence of multiple fluorescent centers of varying sizes. These fluorescent centers scatter photon energy, leading to a wide full width at half maximum (FWHM >80 nm). To tackle this issue, the study significantly improves the fluorescence efficiency of coal-based CDs by employing a nitrogen-doping approach. Additionally, these nitrogen-doped CDs are combined with polyvinyl alcohol (PVA) to formulate secure inks exhibiting solid-state fluorescence and room-temperature phosphorescence (RTP) properties, showcasing their potential for anti-counterfeiting applications in safeguarding important documents and artworks.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2021
·
IF 3.315
Yang Fan,Jingyu Wang,Ximing Zhang,Zaisheng Zhu,Yin Liu,Atian Xie,Hongcun Bai,Ling Bing Kong
The introduction of magnetic materials into carbon materials has been proved to be an effective approach to tailor and improve electromagnetic wave (EM) absorption. In this study, coal-based carbon/FeCo (CBC/FeCo) magnetic composites were designed and prepared. These samples exhibit layered stripes similar to graphite. In these novel composites, the FeCo alloy exhibits strong magnetic loss and the coal-based carbon (CBC) not only acts as an impedance matching medium but also exhibits excellent dielectric loss. Therefore, the CBC/FeCo composites exhibit strong EM absorption, with minimum reflection loss ( RL min ) of −60.81 and −49.82 dB at thicknesses ( d ) of 1.38 and 2.45 mm, respectively. Compared with pure coal-based carbon and FeCo alloy, the improvement in EM absorption can be mainly attributed to the improved impedance matching and enhanced multiple interfacial polarization . In addition, the effects of reaction temperature and the content of FeCo on EM absorption performance of the composites were also studied. Specifically, samples of S-2 with process temperature at 800 °C for 2 h and the FeCo alloy mass loading was 0.3 g (CBC/FeCo-0.3), the EM absorption performance was optimized. It is believed that the CBC/FeCo composites could be promising candidates for EM absorbers.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
SYNTHETIC METALS
·
2023
·
IF 4.4
Yongli Meng,Yin Liu,Chong Yang,Ling Bing Kong
Nickel ferrite/coal-based carbon (NiFe 2 O 4 /CBC) composites were synthesized by using microwave irradiation and simple hydrothermal method . The effects of reaction conditions on particle size, morphology, magnetic, and microwave absorption properties of the NiFe 2 O 4 /CBC composites were systematically studied. In all NiFe 2 O 4 /CBC composites, NiFe 2 O 4 microspheres with different shapes and sizes were anchored on the surface of CBC. By adjusting size of the NiFe 2 O 4 particles, dielectric and magnetic properties of the NiFe 2 O 4 /CBC composites could be optimized simultaneously. For the NiFe 2 O 4 /CBC sample with the average particle size of NiFe 2 O 4 to be 4.69 nm, when the thickness was 4.42 mm, the minimum reflection loss (RL min ) could reach − 63.15 dB at 9.89 GHz. Meanwhile, the maximum effective absorption bandwidth (EAB max ) was 4.91 GHz (6.31–11.22 GHz) at a thickness of 5 mm, which almost covered the whole X-band. The s-shaped hysteresis loop of the sample revealed that it had typical superparamagnetic characteristics. The possible mechanism of microwave absorption was also discussed. Our NiFe 2 O 4 /CBC composites could be used as a new and efficient microwave absorption material.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 29
·期 1
·116
·
IF 4.6
Xinyue Jia,Mengran Lou,Yang Wang,Ruiying Wang
Efficient and inexpensive electrocatalysts play an important role in the hydrogen evolution reaction (HER) of electrolytic water splitting. Herein, Ni2P-MoC/coal-based carbon fiber (Ni2P-MoC/C-CF) self-supporting catalysts were obtained by low-temperature phosphorization and high-temperature carbonization. The Mo source and oxidized coal were uniformly dispersed in the carbon support by electrospinning technology. A precursor of Ni was introduced by the impregnation method. The synergistic effect of MoC and Ni2P may reduce the strong hydrogen adsorption capacity of pure MoC and provide a fast hydrogen release process. In addition, the C-CFs prepared by electrospinning can not only prevent the agglomeration of MoC and Ni2P particles at a high temperature but also provide a self-supporting support for the catalyst. As a result, the catalytic performance of the HER was improved greatly, and a low overpotential of 112 mV at 10 mA cm−2was exhibited stably by the Ni2P-MoC/C-CFs. This work not only converts coal into coal-based carbon materials but also provides a feasible pathway for the rational design of large-scale molded hydrogen electrocatalysts.Keywords:molybdenum carbide;nickel phosphide;coal-based carbon fibers;hydrogen evolution reaction;electrocatalysis
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yongli Meng,Qian Qian,Yin Liu,Ling Bing Kong
A simple hydrothermal method combined with microwave irradiation was used to synthesize nickel-zinc ferrite/coal-based carbon (Ni 1−x Zn x Fe 2 O 4 /CBC) composites. The influences of Zn 2+ concentration on the magnetism and microwave absorption characteristics of Ni 1−x Zn x Fe 2 O 4 /coal-based carbon composites were examined. The Ni 1−x Zn x Fe 2 O 4 particles were equally anchored on the coal-based carbon within the Ni 1−x Zn x Fe 2 O 4 /CBC composites. The dielectric and magnetism characteristics of Ni 1−x Zn x Fe 2 O 4 /CBC composites can be improved simultaneously by adjusting the Zn 2+ concentration. The minimum reflection loss (RLmin) for the sample at x = 0.4 is −65.5 dB for a thickness of 4.0 mm. The samples also have typical soft magnetic properties . Furthermore, some possible mechanisms of microwave absorption are investigated. Our Ni 1−x Zn x Fe 2 O 4 /CBC composites show great potential for microwave absorption applications.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Yuhu Feng,Mengran Lou,Luxiang Wang,Shengjiao Wen,Yang Wang,Ruiying Wang
Transition metal phosphides (TMPs) are often considered as a cost-effective replacement for precious metal catalysts in hydrogen evolution reaction (HER). Herein, the fibers are produced by combining coal with electrospinning technology, and then undergoing a pre-oxidation process for transforming into pre-oxidized coal-based fibers. Subsequently, CuCo-metal organic framework (CuCo-MOF) is grown on the pre-oxidized coal-based fibers using solvothermal method, and the Cu 3 P/Co 2 P/coal-based carbon fibers (Cu 3 P/Co 2 P/C-CFs) composite catalyst is successfully fabricated by phosphating at low temperature and carbonizing at high temperature. The uniformly grown nanoparticles (NPs) on the surface of C-CFs enhance the electrochemically active area, while the electron transfer between Cu 3 P and Co 2 P effectively modulates the electronic structure, increasing the catalytic activity of the catalyst for HER. In addition, the flexible C-CFs not only serve as self-supporting electrode but also effectively inhibit the agglomeration of Cu 3 P/Co 2 P NPs. Remarkably, the overpotential of Cu 3 P/Co 2 P/C-CFs is 83 mV at 10 mA cm −2 current density for HER in 0.5 mol L −1 H 2 SO 4 solution. This study presents promising strategies for the high value-added utilization of coal and the synthesis of highly effective non-precious metal catalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Menghan Sun,Jinshuo An,Zonglin Pan,Guoqing Feng,Xinfei Fan,Chengwen Song,Tonghua Wang
Electrochemical filtration process (EFP) which adopted the coal-based carbon membrane (CCM) as both anode and filter was successfully applied for organic wastewater treatment and presented the promising prospects. In this work, a further enhancement on the wastewater treatment performance of EFP was achieved through the simple Fe 2+ addition (Fe-ECM). The mechanism of the enhanced treatment performance for Fe-ECM system was explored and the effect of operational parameters on the wastewater treatment performance of Fe-ECM system were studied. Results showed that Fe-ECM system established an almost 100% removal efficiency for 250 ppm RhB simulated wastewater when 13.2 μM Fe 2+ was added in the system, which was much higher than that of membrane filtration by CCM or electrochemical filtration carbon membrane (ECM) system. The performance enhancement of Fe-ECM system was attributed to the Fenton process: the hydrogen peroxide (H 2 O 2 ) was electrochemically generated on CCM via the reaction between H 2 O and dissolved oxygen, thus more hydroxyl radical (·OH) was produced in the Fe-ECM system compared with the ECM system through Fenton reaction between the generated H 2 O 2 and Fe 2+ in the solution. Moreover, the Fe-ECM system displayed a good applicability for the decontamination of different organic wastewater and a good reusability was observed for several cycles operation. This work provided an alternative way to enhance the organic wastewater treatment performance of ECM process.
研究领域:
环境科学
·
污水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 63
·35989-35997
·
IF 2.936
Halidan Maimaiti,Abuduheiremu Awati,Dedong Zhang,Gunisakezi Yisilamu,Bo Xu
To obtain high-efficiency, low-cost, environmentally friendly carbon-based photocatalytic material, we synthesized coal-based carbon dots with sp2 carbon structure and multilayer graphene lattice structure by the hydrogen peroxide (H2O2) oxidation method to strip nano-scale crystalline carbon in the coal structure and link with oxygen-containing groups such as the hydroxyl group. N, S co-doped aminated coal-based carbon nanoparticles (NH2-CNPs) were then obtained by thionyl chloride chlorination and ethylenediamine passivation. The physical properties and chemical structure of the synthesized NH2-CNPs were studied and the photocatalytic CO2 reduction performance was tested. The results show that NH2-CNPs are vesicle-type spherical particles with particle size of 42.16 ± 7.5 nm and have a mesoporous structure that is capable of adsorbing CO2. A defect structure was formed on the surface of the NH2-CNPs due to the doping of N and S elements, thereby significantly improving the ability to photogenerate electrons under visible light along with the ability to efficiently separate the photo-generated carriers. The photocatalytic reduction products of CO2 over NH2-CNPs were CH3OH, CO, C2H5OH, H2 and CH4. After 10 hours of reaction, the total amount of products was 807.56 μmol g−1 cat, the amount of CH3OH was 618.7 μmol g−1 cat, and the calculated selectivity for conversion of CO2 to CH3OH was up to 76.6%.
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
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Mengran Lou,Ruiying Wang,Jie Zhang,Xincun Tang,Luxiang Wang,Yong Guo,Dianzeng Jia,Hongli Shi,Lili Yang,Xingchao Wang,Zhipeng Sun,Tao Wang,Yudai Huang
Development of a Pd-based catalyst with highly active and durable properties for formic acid oxidation reaction at the anode remains an important matter of interest in the research community. Herein, we have designed novel coal-based carbon fibers (Coal-CFs) with dicyandiamide (DCD) as nitrogen (N) source, triphenylphosphine (TPP) as phosphorus (P) source dual-doped to support Pd catalysts (Pd/NP-Coal-CFs(DCD/TPP)), which exhibit superior catalytic performance toward formic acid oxidation reaction. Mass activity of formic acid oxidation of Pd/NP-Coal-CFs(DCD/TPP) catalyst is 536.6 mA·mg–1Pd, which is 2.5 times higher than that of Pd/Coal-CFs catalyst. The higher specific surface areas, exclusive electron transport path, and the high synergistic interaction of N and P are the favorable phenomena for catalytic performance. The addition of coal not only increases the abundant defects sites but also makes the utilization of coal with high added value. This N and P dual-doped catalyst inspires an idea for promoting applications in practical fuel cells.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Shiyong Xu,Mei Li,Yijun Wang,Zhiliang Jin
In pursuit of exploring functional applications of coal, this study ultrasound-assisted hydrogen peroxide was used to transform cheap coal into environmentally friendly and high-value coal-based carbon quantum dots (CQDs). These CQDs are then harnessed to synergistically assist the photocatalytic water splitting for hydrogen evolution , in collaboration with CoMoO 4 (CM) and g-C 3 N 4 (CN). The results indicated that the novel composite photocatalyst , CMCN-11/8%SCQDs, exhibited high hydrogen evolution activity, reaching a maximum hydrogen production rate of 4916.63 μmol g −1 h −1 at pH 9. At a wavelength of 420 nm, the apparent quantum efficiency (AQE) was 1.78%. The conduction and valence band positions of CM were determined to be −1.03 eV and 1.65 eV, respectively, while those of CN were −0.83 eV and 1.72 eV, suggesting the formation of an S-type heterojunction between CM and CN. The significant role of SCQDs in enhancing the photocatalytic hydrogen evolution was extensively investigated, demonstrating that the synergistic effect between SCQDs, CM, and CN could enhance the hydrogen evolution activity. SCQDs exhibited excellent electron transfer capabilities, serving as bridges for electron transport, functioning both as electron acceptors and donors, effectively impeding the rapid recombination of electron-hole pairs and enhancing their separation efficiency. This study provides crucial insights into the utilization of coal-based CQDs for photocatalytic water splitting, offering an economically viable and sustainable option for the functional application of coal and opening new avenues for the rational design of efficient and cost-effective photocatalysts.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 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）