JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2022
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IF 10.319
Xiaotong Feng,Lifen Gu,Naiyu Wang,Qiaosheng Pu,Guangli Liu
Carbon-based adsorption and TiO 2 -based photocatalysis are both safe and low-cost ways of pollutant purification. Constructing C-TiO 2 architectures can effectively improve removal efficiency. However, most of those carbon frames only acted as supporting substrates, exhibiting rather limited synergistic action from TiO 2 and carbon. Herein, Fe/N co-doped nano-TiO 2 wrapped on mesoporous carbon spheres with a core-shell structure was designed. The Fe, N co-doped carbon sphere with a hierarchical structure improved the synergy of adsorption and transfer during the photocatalytic process. Without extra dopant, the Fe and N partly exposed on the surface realized the in-situ migrating into the TiO 2 shell to enhance the interface effect, which significantly promoted the photocatalytic efficiency of the composite. Furthermore, the photocatalytic efficiency of the composite was investigated through two typical pollutants under visible-light irradiation. The degradation efficiencies for rhodamine B and paraxylene were 96.2% in 60 min and 94.1% in 20 min, respectively, with the apparent rate constant of 0.045 min –1 and 0.049 min –1 , 8.3 and 11.4 times of that for bare TiO 2 . The composite is likely advantageous for treating diverse environmental pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Peng Zhao,Yanlu Li,Lili Li,Shulin Bu,Weiliu Fan
Here, we report oxygen vacancy (VO)-modified B/N-codoped ZnGa2O4 (VO-B/N-ZGO) nanospheres, showing excellent photocatalytic H2 production even without a Pt cocatalyst, which is better than that obtained with VO-modified B-doped ZnGa2O4 (VO-B-ZGO) or N-doped ZnGa2O4 (N-ZGO) and as high as about three times of that achieved with the undoped ZnGa2O4 (ZGO) photocatalyst. The dramatically enhanced photocatalytic activity of VO-B/N-ZGO predominately originates from the improvement of charge separation and surface activation. Experimental characterization combined with the theoretical calculation method demonstrates that VO-B/N-ZGO can show effective charge compensation more easily through the interaction of oxygen vacancies, interstitial boron, and substitutional nitrogen; especially for the formation of a B–N bond, it avoids the presence of semioccupied states as new recombination centers in a doped photocatalyst. In addition, VO-B/N-ZGO rich in reactive sites is generated by oxygen vacancy-modified B/N-codoping, which overcomes the limitation for most semiconductors without high H2 evolution activities in the absence of a cocatalyst and provides a potentially new photocatalytic H2 generation research.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2918
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IF 5
Cheng Tang,Tao Hu,Chengzhen Du,Ziqin Liao,Wenyan Cheng,Fen Wang,Xiaoli Hu,Kunpeng Song
A Fe-N conjugated organic polymer (SMP-Fr-Py) was prepared from ferrocene and pyrrole using a Scholl coupling reaction, which significantly improved the performance of Cr(VI) removal compared to the polymer (HCP-Fr-Py) prepared by adding the cross-linker formaldehyde dimethyl acetal (FDA). The results showed that at a pH of 2 and at 25 °C, the removal of Cr(VI) reached 90% for SMP-Fr-Py and only 58% for HCP-Fr-Py after 20 min of reaction. Subsequently, 99% and 78% were achieved after 120 min of reaction, respectively. The test results showed that the removal reaction followed a pseudo-second-order kinetic model. The removal efficiency decreased with increasing solution pH and initial Cr(VI) concentration, but increased with increasing SMP-Fr-Py dosage, reaching three cycles. The characterization of the reaction complexes and measurements of Cr species conversion revealed the near absence of Cr(VI) species in the solution. Approximately 38% of Cr(VI) was found to be adsorbed on the material surface, with another fraction present in solution (24%) and on the material surface (38%) in the form of Cr(III). The overall study showed that the direct connection of ferrocene and pyrrole in SMP-Fr-Py through C-C bonding increased the conjugated structure of the polymer backbone, which facilitated electron transfer and transport. Furthermore, the Fe-N elements worked synergistically with each other more easily, which improved the removal performance of Cr(VI) and provided a reference for the subsequent work.Keywords:organic polymers;Fe-N co-doping;Cr(VI) removal;conjugate structure
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
ECS Journal of Solid State Science and Technology
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2013
·Vol. 2
·期 9
·R196
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IF 0
Yi-Fei Wang,Lihong Liu,Rong-Jun Xie,Qing Huang
Eu2+ doped BaMgAl10O17:Eu2+ (BAM) phosphors suffer from serious instability, although they have been widely used in various lighting and display applications. In this paper, high thermally stable Si–N-codoped BAM phosphors have been prepared by the microwave assisted sintering method at a relatively low temperature of 1450°C, and they were synthesized at 1550°C by the conventional solid-state reaction method for comparison. The microwave assisted sintering could reduce the activation energy and thus enhance the diffusion rate, and greatly improve the substitution amount of Si–N pairs for Al–O ones in the BAM host lattice. The Si–N doping significantly increased both the photoluminescence and the thermal stability of the BAM phosphors under ultraviolet (UV) and vacuum ultraviolet (VUV) excitations, comparable to the samples prepared by the conventional solid state reaction method. The proposed method is expected to be potentially applicable to other phosphors with higher photoluminescence and stability.
研究领域:
材料科学
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光学工程
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Lu Luo,Jianping Deng,Qianqian Zhang,Yuling Lan,Guanben Du,Mizi Fan,Weigang Zhao
B/N co-doped porous carbons (BNCs) with abundant micropores were developed by a microwave-introduced heating and activator-free strategy. The thermal decomposition of the dopant NH 4 B 5 O 8 ·4 H 2 O) creates well-developed micropore architecture in BNC-180, achieving a remarkable specific surface area of 891 m 2 g −1 and a pore volume of 0.46 cm 3 g −1 , significantly surpassing the non-doped sample C-180 (605 m 2 g −1 ). Additionally, incorporating high levels of B and N into the carbon skeleton modified the functional group species and electron distribution, enhanced electrical conductivity, and boosted electrochemical performance. Compared with C-180 (93.0 F g −1 ), the as-prepared BNC-180 manifests a specific capacitance of 219.0 F g −1 at 0.5 A g −1 in a three-electrode configuration with a striking rate performance of 83.8 % at 10 A g −1 , implying that the porosity and surface chemical functional groups play a crucial role. Furthermore, the as-built symmetric supercapacitor shows a pronounced energy density of 13.4 Wh kg −1 at 375 W kg −1 , and still remained 10 Wh kg −1 at 7500 W kg −1 . The excellent durability was demonstrated by the outstanding cycling stability with a specific capacitance retention of 87.84 % after 20,000 cycles.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Rouying Cai,Chenfang Miao,Liang Zhang,Yi Zhou,Yuebin Liu,Chen Zheng,Wendi Han,Zhengjun Huang,Xin Zhou,Shaohuang Weng
Tigecycline (TIGE) plays a significant role in the management of complex and serious bacterial infection. The monitoring of TIGE content in plasma and the further application in pharmacokinetic (PK) study is important for clinical medicine, however, the facile and effective strategy is limited. Herein, a sensitive, accurate and facile method for TIGE detection was developed by fluorescence with F, N codoping carbon dots (F, N-CDs) as probe. F, N-CDs exhibited stable maximum emission fluorescence at 500 nm and large Stokes shift of 135 nm. Such property help to weaken the possible self-absorption of biological system and the spectral overlap of fluorophore . Thus, using F, N-CDs as probe, the method exhibited accuracy and similarity of the analytical performance of TIGE detection in human plasma and rat plasma. The validated method was successfully applied to the PK research of TIGE in rat after intravenous injection at three dose levels of 1 μg/g, 2 μg/g, and 4 μg/g at different time-points. The obtained PK parameters of TIGE using this method were basically consistent with current clinical practice. The findings demonstrated the application ability of F, N-CDs for PK study of TIGE ascribed to the clinical need of simple operation, accuracy and rapidity.
研究领域:
医学
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药理学
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生物化学
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2022
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IF 4.326
Jiakang Wan,Ling Wang,Wentao Xu,Zehai Xu,Junsheng Yuan,Guoliang Zhang
Design and synthesis of high-efficiency and stable heterogeneous catalysts for the electro-Fenton process remain challenging. In this study, a co-doped Ce and N metal–organic framework MIL-101(Fe) heterogeneous catalyst (Ce/N-MIL-101(Fe) was synthesized by a facile one-step solvothermal method. Polyvinyl pyrrolidone played dual roles during the fabrication process, which not only acted as a nitrogen source for doping but also prevented MIL-101(Fe) molecules from aggregating and reinforcing the formation crystal with a complete polyhedral crystal shape. The introduction of Ce significantly enhanced the density of active sites and promoted the Fe3+/Fe2+ cycle of the reaction system. Owing to the specific structure and properties, the rate of electron transfer in the catalytic process was significantly promoted. The synthesized Ce/N-MIL-101(Fe) catalyst exhibited a high degradation rate for dyes (>98%) with competitive stability and reusability. Moreover, compared with common electro-Fenton catalysts usually operated in a limited pH range of 3.0–6.0, the working pH range of Ce/N-MIL-101(Fe) was widened up to 10.0. The design concept for producing abundant active sites with co-doping into frameworks can be extended to more heterogeneous electro-Fenton catalysts constituted by other porous materials.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Biomass Conversion and Biorefinery
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2023
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IF 4
Chen Jun Xiu,Li Jin Hao,Bao Agula
The development of porous carbon materials with high CO 2 adsorption capacity is crucial for addressing the current issues of industrial air pollution and global warming. In this study, B/N codoped porous carbon materials were prepared via a combined strategy involving the use of a self-sacrificing template in conjunction with potassium hydroxide activation; moreover, g-C 3 N 4 was used as the N source and boric acid was used as the B source. The pore structure and surface chemistry were investigated in detail using different techniques such as X-ray diffraction, scanning electron microscopy, N 2 adsorption and desorption, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. Results showed that the prepared material exhibited the highest specific surface area (2278 m 2 /g) and pore volume (1.00 cm 3 /g) when the ratio of B/N sources was 1:0.5; moreover, its CO 2 adsorption value (3.26 mmol/g) was higher than those of most codoped adsorbents.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MRS Communications
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2023
·Vol. 13
·期 4
·538-545
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IF 1.9
Yin Jinkun,Chu Yaoqing,Tan Lianjiang
Cu/N co-doped TiO 2 nanopowder was prepared with a facile sol–gel method. In the absence of stabilizing agents, the co-doped nanopowder with nanoscaled particle sizes was obtained. Doping didn’t change the anatase crystal structure of TiO 2 . Cuprite Cu 2 Cl(OH) 3 formed in the co-doped nanopowder. Based on ultraviolet–visible (UV–vis) spectroscopy and X-ray photoelectron spectroscopy (XPS) data, the mechanisms of significantly improved photocatalytic activity of the co-doped nanopowder were discussed. The antibacterial evaluation and cytotoxicity test suggested the nanopowder inhibited bacteria significantly under visible light and had ultralow cytotoxicity. This work provided a promising antibacterial agent with potential biomedical applications.
Graphical abstract
研究领域:
材料科学
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生物医学
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产品关联
DOI
高影响因子
Forests
·
2023
·Vol. 14
·期 5
·965
·
IF 2.9
Gaojun Chen,Yudong Li,Enshan Han,Ziqiang Zhang,Xiaohui Yang,Desheng Zhou,Yanzhen He
The optimization of supercapacitive properties in carbon materials derived from cheap and sustainable wood scraps exhibits great application potential. Herein, in support of interfacial groups, polyaniline nanospheres were in situ constructed in the internal pore structure of wood scraps; further, the B and N elements were imported by carbonized and hydrothermal methods. The doped B regulated the species of N doping to improve the electrical conductivity of carbonized wood scraps, and it endowed a certain pseudo-capacitance. Coupled with the fine double-layer capacitance from the hierarchical structures constructed by carbonized nanospheres and wood scrap channels, a high specific capacitance of 406 F g−1at 0.5 A g−1, high energy density (17.71 Wh kg−1at 250 W kg−1) and cycle stability (93.04% capacitance retention after 10,000 cycles) were performed simultaneously. This study provided a new strategy to improve the supercapacitive performance of bio-carbon materials in terms of structure and conductance.Keywords:wood scrap;B/N co-doping;porous carbon;in situ synthesis;supercapacitor
研究领域:
材料科学
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能源技术
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DOI
高影响因子
DESALINATION
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2025
·
IF 9.8
Fei Yu,Haoyuan Yin,Jie Li,Tianjie Chen,Liping Sun,Jie Ma
Developing bismuth-carbon composites that can alleviate the stress concentration and volume expansion problems during the Bi/BiOCl conversion reaction is crucial for electrochemical desalination, especially Cl − removal technology, but it is still a great challenge. Here, we report a B/N co-doped bismuth encapsulated in carbon tubes. Using CAU-17 as a template, a carbon tubular material with multiple carbon layer structures was successfully synthesized by co-pyrolysis with BCN nanosheets, which achieved effective encapsulation of Bi. As the pyrolysis temperature increased, the continuous evaporation of Bi prompted the transformation of the carbon tube structure from a soft carbon to a hard carbon structure interconnected by multi-layered short graphene flakes. This alleviated the instability of the electrode caused by the volume expansion during the Bi/BiOCl transformation reaction and also provided additional ion storage capacity. When applied to the CDI dechlorination anode, Bi@BCN-900 exhibited a high desalination capacity of 145.96 mg g −1 and low energy consumption of 0.53 kWh kg −1 NaCl at an applied voltage of 1.2 V. Moreover, Bi@BCN-900 showed good stability over long-term cycling tests. This work expands the application of CAU-17 and offers new research insights for the design of bismuth-based materials for CDI dechlorination anodes.
研究领域:
材料科学
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环境工程
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电化学
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DOI
高影响因子
AICHE JOURNAL
·
2021
·Vol. 67
·期 6
·e17197
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IF 3.993
Liyun Huang,Kui Wu,Qian He,Chao Xiong,Tao Gan,Xiaohui He,Hongbing Ji
Single atom catalysts (SACs), featured with atomically dispersed metal species, have been considered as one of the most promising catalytic materials because of the excellent performance in various high-value-added reactions. However, the large-scale and continuous-type production of such SACs is still challenging. Herein, a novel and facile microcapsule strategy for the quasi-continuous synthesis of iron SACs supported on S, N co-doped carbon (Fe/SNC) is developed, and the Fe species are presented as isolated active sites and stabilized as the FeN 3 S-like structure. The as-prepared Fe/SNC catalysts exhibit excellent catalytic properties for selective oxidation of arylalkanes, which followed pseudo-first-order kinetics with an E a = 41.5 kJ/mol. More importantly, the two Fe/SNC catalysts synthesized at different continuous times showed essentially identical catalyst structure and catalytic performance, demonstrating the superior reliability of our microcapsule strategy for the quasi-continuous production of SACs, which can be easily scaled up to industrial application.
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
危险品化学品经营许可证（带存储）