CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yuan Zhang,Kangping Cui,Xueyan Liu,Minshu Cui,Xing Chen,Yuchao Tang,Haiyang Li,Kun Wang
In order to improve the photocatalytic activity of pristine carbon nitride while maintaining its metal-free property to achieve the activation of peroxymonosulfate (PMS), a series of carbon-doped g-C 3 N 4 (BCN) with different carbon contents were synthesized in this paper by adding benzotriazole to urea. The catalyst obtained by this approach significantly promoted PMS activation and enhanced the degradation efficiency of 4-chlorophenol (4-CP). Experiments and theoretical calculations showed that the introduction of carbon not only narrowed the band gap, but also accelerated the separation of photoinduced electron-hole pairs, which greatly improved the photocatalytic activity of g-C 3 N 4 . In the degradation of pollutants, free radicals and non-free radicals acted simultaneously, with non-free radicals playing a dominant role. This study explained the origin of 1 O 2 by Density functional theory (DFT) calculations, visible light excited photocatalysts to form holes, while carbon introduction decreased the valence-electron density around the area, inducing electron transfer from PMS toward g-C 3 N 4 directed to generate 1 O 2 . The 1 O 2 -dominated degradation process improved the application of the catalysts in complex aqueous matrices. In addition, we proposed 4-CP degradation pathways, and the toxicity of intermediates derived from 4-CP degradation process reduced.
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
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiaogang Guo,Taotao Liang,Huisheng Huang,Binfang Yuan,Jing Wang
In 21st century, the microchip plays an essential role in data and information security, and preventing information leakage stored in chips becomes more challenging. This paper firstly introduced electrophoretic assembly technique and surface functionalization to design the C-doped nano-Al/Co 3 O 4 functional energetic material (nFEM) coating with triple stability of anti-wetting, micro-structure and energy-release for at least one year, and the energetic film was integrated with copper based-chip to construct the C-doped Al/Co 3 O 4 nFEM-chip to realize its self-destruction. Product shows outstanding anti-wetting properties with high water contact angle of 168 ± 1° and extremely low sliding angle of ∼ 1°, and well weather resistance in variable environments. Impressively, the output of heat (Q) of product can reach up to 3598 J/g nearly 85% of theoretical value with a relatively low activation energy of 235.46 kJ/mol, and keeps almost thermopositive stability even for immersed samples for fifty cycles after one year exposure test. In addition, C-doped Al/Co 3 O 4 nFEM-chip after immersion and exposure tests can also be effectively destroyed or ignited with a dazzling flame in an ultrashort time (<1ms), demonstrating the great advantage and huge application potentials for the design of other functional transient-chips with nano/micro-scale high-energy systems applied in different environments, even underwater.
研究领域:
材料科学
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信息安全
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能源材料
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表面工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Ming Xiao,Ruixue Li,Xinyu Hu,Wenke Zhu,Zhuo Yu,Hongbo Xiao,Wenlei Wang,Ting Yang
This paper is focused on the functional photocatalyst of in-situ carbon-doped TiO 2 decorated Fe 3 O 4 heterojunctions (C/TiO 2 @Fe 3 O 4 ) for the efficient photocatalytic oxidation of As(III). Series of characterizations show that the photocatalytic activity of TiO 2 changes from a single UV wavelength to visible light excitation when carbon atoms are successfully doped in the TiO 2 lattice, expanding the utilization rate of light energy. DFT calculation further confirmed that the C–O–Ti bonds can diminish the theoretical band-gap of TiO 2 . Furthermore, the successful construction of C–O–Ti and Ti–O–Fe interface bonds provide pathways for fast electron transfermation, which can effectively prompt the separation of photo-generated carriers and enhance the photocatalytic oxidation efficiency of As(III). The application results showed that the synthesized C/TiO 2 @Fe 3 O 4 photocatalyst by introducing Fe 3 O 4 with a mass fraction of 1% can complete the transformation of As(III) (10,000 μg/L, 40 mL) to As(Ⅴ) within 12 min under visible light irradiation. In addition, C/TiO 2 @Fe 3 O 4 exhibits excellent reusability, which remains 100% photooxidation efficiency of As(III) without changing crystal structure after 6 cycles and can also be recovered completely with magnet. The remarkable photocatalytic oxidation performances of C/TiO 2 @Fe 3 O 4 can be ascribed to the synergistic effects of OH, O 2 − and h + in the photocatalytic oxidation process and the constructed C–O–Ti and Ti–O–Fe interface bonds.
研究领域:
材料科学
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环境科学
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化学
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DOI
高影响因子
Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 23
·5006-5015
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IF 6.569
Ruozhen Wu,Juanyuan Hao,Tingting Wang,Shengliang Zheng,You Wang
The two-dimensional layered metal dichalcogenides (LMDs) SnS2 is an interesting candidate for high-performance NO2 gas sensors. However, most SnS2-based NO2 sensors are usually inert for detecting ppb-level NO2 at room temperature (RT) because of the intrinsic features of a large bandgap, poor conductivity, and lack of active sites. Herein, we successfully endowed SnS2 with ppb-level NO2 detection at RT by using a carbon (C)-doping strategy. Compared to the pristine SnS2 showing a negligible response toward NO2 at RT, the C-doped SnS2 exhibited an excellent response (481.3% for 1 ppm and 146.5% for 100 ppb) with full recovery. The sensitivity toward ppb-level NO2 was as high as 1200% ppm−1. Moreover, the experimental and theoretical limit of detection (LOD) were down to 10 ppb and 0.3 ppb, respectively. Such impressive gas-sensing performance of C-doped SnS2 at RT was due to the doping-mediated synergistic effect of energy-band modification and the presence of an S vacancy. The results provide a real solution for developing high-performance LMDs-based gas sensors.
研究领域:
材料科学
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传感器技术
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环境监测
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Boxiao Zhao,Wang Gong,Xiaoming Liu,Huiqin Guo,Liushui Yan,Along Gao,Jun Lin
Here, we demonstrate a new type of S and C co-doped g-C 3 N 4 hexagonal ultra-thin tubular composite photocatalyst with extraordinary photocatalytic activity toward H 2 production from H 2 O with visible light irradiation. The S and C co-doped g-C 3 N 4 hexagonal ultra-thin tubular composite photocatalyst was prepared through a precursor calcinating process at 520 °C in a nitrogen atmosphere. The precursor was obtained through a supramolecular self-assembly strategy using melamine and thiolactic acid as raw materials by a crosslinking process of sulfhydryl and carboxyl groups. Benefiting from the synergetic effects of elements doping and the ultra-thin tubular morphology, the obtained S and C co-doped g-C 3 N 4 hexagonal ultra-thin tubular composite photocatalyst exhibits a highly efficient photocatalytic activity toward H 2 production from H 2 O with the irradiation of visible light, which is 24 times higher than that of the pristine g-C 3 N 4 . The optimized apparent quantum yield was demonstrated to be around 9.56 %. A possible photocatalytic mechanism relating to H 2 evolution from H 2 O with visible light irradiation concerning the prepared S and C co-doped g-C 3 N 4 hexagonal ultra-thin tubular composite photocatalyst was proposed. The current study might provide valuable insights for the design and synthesis of highly efficient photocatalysts for hydrogen production using solar energy.
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
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2021
·Vol. 97
·期 5
·1267-1274
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IF 3.174
Ganning Zeng,Chunxian Hong,Yuan Ma,Mingming Du,Yan Zhang,Hongwei Luo,Bing Chen,Xiangliang Pan
BACKGROUND During the past two decades, aquatic polycyclic aromatic hydrocarbon (PAH) contamination has gained more and more attention, because of carcinogenicity or mutagenicity, toxicity, persistence and bioaccumulation, and a huge threat posed to entire ecosystems. RESULTS Sargassum horneri ( SH )-based carbon was pretreated with ethanol and formaldehyde, and obtained after pre-carbonization using H 2 SO 4 . The SH carbon powder was used to immobilize nano-TiO 2 in aquatic environment by a facile sol–gel method. The resulting C/TiO 2 catalyst was applied to photocatalytic aquatic naphthalene degradation under sunlight and showed the best naphthalene degradation performance of 83.77% under simulated sunlight, which could be attributed to the shape and structure contribution originating from SH . C/TiO 2 served as both adsorbent and catalyst in the degradation process of naphthalene, and the photodegradation process conformed to a double-exponential kinetic model, indicating that there are physical and chemical processes involved in the degradation. The mechanism for enhanced photocatalytic activity was verified as a synergistic mechanism resulting from SH -based carbon and TiO 2 , and showed industrial potential for removal aquatic PAH pollutants. CONCLUSIONS This study verifies that the synergistic effect resulting from SH -based carbon and TiO 2 enhanced the photocatalytic performance. © 2021 Society of Chemical Industry (SCI).
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 MATERIALS ENGINEERING AND PERFORMANCE
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2021
·Vol. 30
·期 5
·3484-3491
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IF 1.819
Gao Yong,Zhang Haibo,Xu Zengshi
Molybdenum trioxide holds the promise of high-performance cathodes for lithium-ion batteries. This study introduces a facile one-step method for large-scale synthesizing B, C co-doped α -MoO 3 single crystals by simultaneous decomposition of boric acid, carburization and vapor deposition on a molybdenum substrate. Experimental characterizations indicate that the B and C co-doping promotes the carrier mobility by inducing impurity states near the Fermi level. Additionally, when subjected to the high voltage, the Mo-C and Mo-B bonds become the controlling factors for enhancing the structural stability through the reduced interplanar spacing which facilitates the restriction of transition-metal ion migration. The target material delivers a high discharge capacity of 305 mAh g −1 with initial Coulombic efficiency of 98%, and shows remarkable cycle stability with a specific capacity of 280 mAh g −1 after 80 cycles. This study sheds light on a new strategy for designing and controlling of the doping activity in other transition-metal-oxides for next-generation lithium-ion batteries.
研究领域:
材料科学
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电化学
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DOI
高影响因子
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
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2024
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IF 1.3
Wenbin Jin,Nan Liu,Fang Cheng,Zongqing Ma,Yongchang Liu,Pingzhan Si,Hongliang Ge
We report the C substitution effects in MgB 2 bulks on the lattice parameters, FWHM, and critical current density ( J c ) as a function of doping level. It is shown that using carbon-coated boron powder can effectively control the grain growth of MgB 2 during the whole sintering process. Accompanied by the rapid cooling process, the final average grain size can be restrained within merely 50 nm, and the J c value of the sample can be significantly improved at high field. On top of that, adding Cu is also considered a key factor in improving the current carrying property of the graphene-doped sample throughout the whole field, which can be attributed to the formation of the MgCu 2 alloy phase.
研究领域:
材料科学
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超导体研究
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Liwen Wang,Guanghui Zhang,Nan An,Ruxin Li,Chang Zhou,Wenjuan Huang,Junyuan Duan,Xiangbai Chen
Hollow structure can provide more active sites and gas transmission channels for gas molecules due to their significant surface area and unique structure, showing significant performance in the field of gas sensing. Here, hollow single-shell porous C-doped Co 3 O 4 polyhedrons are successfully prepared by high temperature calcination using Co-MOF/g-C 3 N 4 precursors through a simple wet chemical method. The results show that the doping of carbon element promotes the formation of single-shell hollow porous structure. The performance test shows that the single-shell hollow porous C-doped Co 3 O 4 polyhedrons structure exhibits high sensitivity (42.41-100 ppm), low detection limit (1 ppm) and excellent selectivity to xylene at 140 ℃. The improved detection performance of the C-doped Co 3 O 4 sensor for xylene is attributed to the hollow single-shell porous structure that increases the gas adsorption area, and the incorporation of carbon atoms regulates the electronic and chemical properties of the material. This process enhances the specific surface area of material, providing more active sites for the reaction process and exhibiting stronger catalytic activity towards xylene. This study proposes a unique method to construct hollow single-shell porous structure.
研究领域:
材料科学
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传感器技术
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2016
·Vol. 100
·期 1
·333-342
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IF 2.787
Linhui Yu,Yangming Lin,Jing Huang,Sen Lin,Danzhen Li
Carbon-doped TiO 2 nanomaterials have been successfully synthesized via an effective two-step procedure involving hydrothermal method and followed by a low-temperature calcination treatment process, through which a controllable amount of carbonate-like species could be incorporated into TiO 2 . First-principles calculations suggest the TiO 2 doped with carbon in form of carbonate-like species can effectively extend the adsorption of the material from ultraviolet region to visible light. And it is experimentally found that carbon-doped TiO 2 nanomaterials exhibit much higher photocatalytic activity than reference P25 and TiO 2− x N x catalysts toward the liquid-phase degradation of organic pollutants under visible light (420 nm < λ < 800 nm) irradiation. The presence of synergic effect between carbonate-like doping and anatase TiO 2 is believed to play an essential role in affecting the photocatalytic reactivity, and the response to the visible light is ascribed to the narrowed band gap energy controlled by carbon doping. Moreover, the roles of active species in the photocatalytic process are compared using different types of active species scavengers. Meanwhile, the degradation mechanism of the photocatalysis is proposed. It is hoped that our work could provide valuable information on the design of carbonate-like doped semiconductor with more excellent properties and set the foundation for the further industrial application.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jing Ji,Xianbo Sun,Weiyu He,Yongdi Liu,Jun Duan,Wen Liu,Long D. Nghiem,Qilin Wang,Zhengqing Cai
A new type of solar active carbon-doped Bi 3 O 4 Br catalyst was synthesized by combining hydrothermal and post-thermal treatment. The activity of the material under sunlight and visible light was 3.3 times and 2.7 times that of Bi 3 O 4 Br, respectively. The C-doping on Bi 3 O 4 Br nanosheets increased the built-in electric field strength , thus significantly promoted the migration of charge carriers and enhanced the photocatalytic activity. In addition, replacing Br with C with a smaller atomic radius can shorten the interlayer spacing, which is beneficial to carrier separation. Experiments showed that the doping of C shortened the semiconductor band gap by 9.8% and expanded the absorption range of visible light. Among the photogenerated reactive species, h + played a major role in the degradation of 1-methylpyrene (a typical polycyclic aromatic hydrocarbons), followed by O 2 ∙ - and •OH. Based on intermediate analysis and DFT calculation, we proposed the degradation mechanism and pathways. Quantitative structure–activity relationship (QSAR) analysis showed that some toxic intermediates were produced during the photocatalysis process, but the overall environmental risk was greatly reduced. This work provides new perspective for understanding non-metallic doping in semiconductor photocatalysts to enhance the built-in electric field, and this technology can be extended to other semiconductor 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
ACS Applied Nano Materials
·
2024
·
IF 5.3
Chaofan Ma,Qun Yang,Huiyu Su,Huimin Yang,Xiaoxia Wang,Dawen Zeng
P-type semiconductors [copper oxide (CuO) and cuprous oxide (Cu2O)] have been widely researched as good gas sensing materials due to their unique oxygen adsorption properties. In this work, C-doped CuO/Cu2O hollow nano-octahedrons have been prepared by thermal decomposition of the Cu-based metal–organic framework ([Cu3(BTC)2]n). The CuO and Cu2O nanoparticles form nano-octahedron heterojunctions by a close packing mode. A large number of active heterojunction sites were exposed, which significantly increased the adsorbed oxygen (O2–) content. Meanwhile, doping C in the lattice of the heterojunction effectively reduces the band gap of CuO/Cu2O and promotes the chemical reaction of the target gas on the surface of the material. Density functional theory calculations indicate that the CuO/Cu2O heterojunction has strong adsorption ability for NO2. Electrochemical impedance spectroscopy further reveals that C-doped CuO/Cu2O hollow nano-octahedrons-40 min heterojunction has the best electron transport performance. The sensors have good gas sensing response (22.88–50 ppm) and selectivity to nitrogen dioxide (NO2) at room temperature (28 °C). In addition, the sensor has extremely low detection, which can detect parts per billion level NO2 (20.50% to 100 ppb). It is expected to provide a reference for the development of a room-temperature NO2 sensor.
研究领域:
材料科学
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化学
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环境科学
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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）