NANO
·
2020
·
IF 1.566
Jieqiong Wang,Jie Yang,Jian Fang,Yuhang Li,Hongyuan Zhang,Zhenbo Zhao,Yuhui Ao
The WSe 2 /g-C 3 N 4 (graphite carbon nitride) composite with photocatalytic properties was synthesized using a hydrothermal method. This synthesis pathway can be characterized by being simple, inexpensive and nonpolluting, integrating the concept of green chemistry. The WSe 2 /g-C 3 N 4 composite could effectively degrade methyl orange solution under visible light irradiation. The decolorization experiment of methyl orange solution shows that the degradation rate of the 30 wt.% WSe 2 /g-C 3 N 4 composite can reach 98.7% after 100 min of illumination, while the degradation rate of pure g-C 3 N 4 was only 87.6% under the same conditions. This can be attributed to the fact that the combination of WSe 2 and g-C 3 N 4 nanosheets can increase the number of active binding sites, increasing the rate of charge separation and transport ability, decreasing the recombination rate of the photogenerated electron–hole pairs. Therefore, the WSe 2 /g-C 3 N 4 composite will have potential development as a new material with low cost, easy synthesis and excellent performance in photocatalytic degradation of water pollution.
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
Reaction Kinetics Mechanisms and Catalysis
·
2021
·Vol. 132
·期 2
·1211-1224
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IF 2.081
Zhang Long,Ge Jianhua,Zhuang Tao,Ding Xiulong,Zheng Xuyang
A series of novel sodium persulfate (Na 2 S 2 O 8 ) modified g-C 3 N 4 photocatalysts were prepared in this study to enhance nitrogen fixation. Characterization results found that the type of precursors and the mass ratio affect the crystal structure, morphology, and optical properties of the modified g-C 3 N 4 . The photocatalysts exhibited considerable nitrogen vacancies (N Vs ) depending on the nature of the different precursors and their mass ratios to Na 2 S 2 O 8 . In addition, the production rate of ammonia of the modified g-C 3 N 4 was significantly higher than that of pure g-C 3 N 4 under optimal conditions. The four cycles show modified g-C 3 N 4 excellent stability. Combined with the results of pH test, the possible mechanism of the photocatalytic nitrogen fixation process using modified g-C 3 N 4 was proposed.
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
CHEMICAL ENGINEERING JOURNAL
·
2018
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IF 6.735
Meng Xie,Junchuan Tang,Lingshuai Kong,Wenhui Lu,Vinothkumar Natarajan,Feng Zhu,Jinhua Zhan
In this work, monochlorophenols (MCPs) isomers degradation was investigated by Co-doped g-C 3 N 4 (CCN) using peroxymonosulfate (PMS) as the oxidant. The effects of the doping amount of Co, the concentration of PMS, the loading of catalyst and initial pH of the solution on the catalyst activity were systematically studied. The results showed that MCPs could be degraded effectively by CCN/PMS system. The degradation reaction followed pseudo-first order kinetics. Sulfate radical (SO 4 − ) was found as the major active radicals in the degradation process. MCPs were degraded effectively with the degradation rate order of 2-chlorophenol (2-CP) > 3-chlorophenol (3-CP) > 4-chlorophenol (4-CP). Except for the influence of structural characteristics of MCPs, this degradation rate order was also related to the adsorption behavior of CCN, which was based on the intermolecular interaction. Based on the analysis of the degradation products of MCPs, 1,4-benzoquinone or chlorinated 1,4-benzoquinone had been found to be the main intermediates.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yixue Xu,Xiaoli Jin,Teng Ge,Haiquan Xie,Ruixue Sun,Fengyun Su,Xin Li,Liqun Ye
The van der Waals (vdW) heterojunction formed between two-dimensional materials can break the anisotropy of the electron beam and is an effective method to improve the photocatalytic performance. Herein, vdW heterostructure is successfully constructed between layered Bi 3 O 4 Cl and 2D g-C 3 N 4 for photocatalytic CO 2 reduction. The weak vdW interaction enables Bi 3 O 4 Cl/g-C 3 N 4 with desirable moderate bandgap and built-in electronic field, which can efficiently separate the electron-hole pairs. As a result, Bi 3 O 4 Cl/g-C 3 N 4 heterostructures exhibit better photocatalytic CO 2 reduction activity compared with pure Bi 3 O 4 Cl and g-C 3 N 4 . The optimized Bi 3 O 4 Cl/20%g-C 3 N 4 possesses the highest CO 2 conversion efficiency with CO and CH 4 generation rate of 6.6 and 1.9 μmol g −1 h −1 , respectively. This work not only reports an effective reference for vdW heterojunction system based on Bi-based and g-C 3 N 4 semiconductors, but also contributes to engineering vdW heterojunctions for satisfactory solar energy conversion performance.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Micro & Nano Letters
·
2022
·Vol. 17
·期 11
·259-271
·
IF 0.98
Yunting Wang,Qing-an Qiao,Honglan Cai,Juan Jin,Hongwei Gao,Yanbin Xu
g-C 3 N 4 was employed as a modified substance for modification engineering of wurtzite-ZnS photocatalysts to overcome its limited light response and stability. The g-C 3 N 4 /ZnS (CNZS) photocatalyst was synthesized by solvothermal reaction of g-C 3 N 4 , thiourea and zinc acetate. The results show that wurtzite-ZnS spheres were loaded on the surface of g-C 3 N 4 with well uniformed size. The photocatalytic activity of the catalyst was determined by the degradation of MB and Rh.B under visible light. The degradation rates of Rh.B and MB by CNZS were 96% and 97%, much better than that of pure ZnS. The addition of g-C 3 N 4 promoted the visible light response of wurtzite-ZnS and inhibited the recombination of photogenerated electrons with holes. The density functional theory (DFT) results indicated that the components of both valence band and conductive band were changed for the CNZS system. Compared to pure ZnS, the band gap of CNZS was decreased about 0.5 eV, and the work function calculations were in good agreement with the experimental results. As a result, the heterostructure of CNZS made it beneficial to the electron transfer from g-C 3 N 4 (2p of N) to ZnS (3p of S) and absorption edge has been extended to about 600 nm.
研究领域:
材料科学
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环境科学
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理论化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
Muhua Chen,Yiping Liu,Ju Liu,Zilin Kan,Chenhui Sun,Yuqing Wang,Bo Fu,Xinbao Zhu
Recently, photocatalytic production of H 2 O 2 by semiconductors emerges as a green and potential method for green and sustainable H 2 O 2 synthesis. In this work, a g-C 3 N 4 /CAU-17 composite with heterojunction structure was fabricated. There is a tight interface contact between g-C 3 N 4 and CAU-17. And the g-C 3 N 4 nanosheets was uniformly wrapped on CAU-17 surface. In the hybrid catalyst, CAU-17 provides a high surface area for g-C 3 N 4 dispersion and the integration of g-C 3 N 4 boosts the visible light response. Results showed that the H 2 O 2 yield is 419.0 μmol . L −1. h −1 over g-C 3 N 4 /CAU-17 sample, which is 1.59 and 7.83 fold enhancements to bare g-C 3 N 4 and CAU-17 counterparts. This work sheds light on the design of CAU-17-based composite photocatalysts and provides insights into H 2 O 2 synthesis.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2015
·Vol. 44
·期 29
·13030-13039
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IF 4.197
Hongmei Chen,Yinghao Xie,Xiaoqin Sun,Meilin Lv,Fangfang Wu,Lei Zhang,Li Li,Xiaoxiang Xu
Separation of photo-generated charges has played a crucial role in controlling the actual performance of a photocatalytic system. Here we have successfully fabricated g-C3N4/TiO2-B nanowire/tube heterostructures through facile urea degradation reactions. Owing to the effective separation of photo-generated charges associated with the type-II band alignment and intimate interfacial contacts between g-C3N4 and TiO2-B nanowires/tubes, such heterostructures demonstrate an improved photocatalytic activity over individual moieties. Synthetic conditions such as hydrothermal temperatures for the preparation of TiO2-B and the weight ratio of TiO2-B to urea were systematically investigated. A high crystallinity of TiO2-B as well as the proper growth of g-C3N4 on its surface are critical factors for a better performance. Our simple synthetic method and the prolonged lifetime of photo-generated charges signify the importance of type-II heterostructures in the photocatalytic applications.
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
Catalysts
·
2025
·Vol. 15
·期 1
·95
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IF 4
Jinghong Fang,Min Wang,Xiaotong Yang,Qiong Sun,Liyan Yu
In this study, a novel Z-scheme heterojunction photocatalyst was developed by integrating g-C3N4nanoplates into ZnIn2S4microspheres. X-ray photoelectron spectroscopy analysis revealed a directional electron transfer from g-C3N4to ZnIn2S4upon heterojunction formation. Under irradiation, electrochemical tests and electron paramagnetic resonance spectroscopy demonstrated significantly enhanced charge generation and separation efficiencies in the ZnIn2S4/g-C3N4composite, accompanied by reduced charge transfer resistance. In photocatalytic CO2reduction, the ZnIn2S4/g-C3N4composite achieved the highest CO yield, 1.92 and 5.83 times higher than those of pristine g-C3N4and ZnIn2S4, respectively, with a notable CO selectivity of 91.3% compared to H2(8.7%). The Z-scheme heterojunction mechanism, confirmed in this work, effectively preserved the strong redox capabilities of the photoinduced charge carriers, leading to superior photocatalytic performance and excellent long-term stability. This study offers valuable insights into the design and development of g-C3N4-based heterojunctions for efficient solar-driven CO2reduction.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yumin An,Zanchao Gao,Beibei Dong,Liguo Dong,Libin Zhao
The photocatalytic hydrolysis reaction primarily unfolds on the material's surface, making the material's morphology and microstructure critical for the catalytic efficiency of photocatalysts. In this paper, a formic acid-assisted melamine hydrothermal self-assembly method is explored to prepare g-C 3 N 4 photocatalysts with a unique morphology. The impact of sintering temperature on the morphology of the g-C 3 N 4 photocatalysts are explored and the effect of formic acid concentration on the XRD and FTIR was analyzed. Findings reveal that the g-C 3 N 4 nanostructures photocatalyst possesses fibrous tubular and nanosheet structures, boasting a heightened specific surface area (32.9 m 2 /g) and a more refined graphite-like crystalline framework. When synthesized with a 0.15 M concentration of formic acid, the g- C 3 N 4 nanostructured photocatalyst achieved a hydrogen production rate (1289.4 μmol h −1 g −1 ), which is approximately 4.8 times greater than that of bulk g-C 3 N 4 (264.7 μmol h −1 g −1 ). This work provides a simple method for preparing high-performance g-C 3 N 4 based photocatalysts for visible light hydrolysis hydrogen production.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 28
·期 3
·3465-3474
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IF 3.056
Bai Maojuan,Xu Chengcheng,Huang Xuanye,Yin Han,Wan Jun
CuSe as an excellent photocatalytic semiconductor material has wildly used in the field of photocatalysis. In this paper, CuSe-PDA/g-C 3 N 4 was designed and synthesized, and the photocatalytic performance of CuSe was further enhanced by the addition of polydopamine (PDA) and graphite phase carbon nitride (g-C 3 N 4 ). The as-prepared CuSe-PDA/g-C 3 N 4 was characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and elemental mapping. The specific surface area and porous characteristics of the material were also studied by N 2 adsorption-desorption isotherm, which the specific surface area were 186.6 m 2 /g and pore size were of 3.1 nm by BET data analysis. The photocatalytic conditions for the degradation of methylene blue (MB) by CuSe-PDA/g-C 3 N 4 were optimized in the experiment. The results showed that the photocatalytic performance of CuSe-PDA/g-C 3 N 4 under visible-light illumination were better than CuSe and PDA owing to the narrow band gap energy and delayed electron-hole recombination. Under the optimized conditions, the removal rate reach to 99% of 50 mg/L MB within 60 min irradiation time. Moreover, the MB removal rate was over 90% through six repeated experiments, which proved that the CuSe-PDA/g-C 3 N 4 composite nanomaterials have good stability and reusability.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Hemdan S. H. Mohamed,Liang Wu,Chao-Fan Li,Zhi-Yi Hu,Jing Liu,Zhao Deng,Li-Hua Chen,Yu Li,Bao-Lian Su
The development of lithium-ion batteries using transition metal oxides has recently become more attractive, due to their higher specific capacities, better rate capability, and high energy densities. Herein, the in situ growth of advanced mesoporous CuO/O-doped g-C3N4 nanospheres is carried out in a two step hydrothermal process at 180 °C and annealing in air at 300 °C. When used as an anode material, the CuO/O-doped g-C3N4 nanospheres achieve a high reversible discharge specific capacity of 738 mAhg–1 and a capacity retention of ∼75.3% after 100 cycles at a current density 100 mAg–1 compared with the pure CuO (412 mAhg–1, 47%) and O-doped g-C3N4 (66 mAhg–1, 53%). Even at high current density 1 Ag–1, they exhibit a reversible discharge specific capacity of 503 mAhg–1 and capacity retention ∼80% over 500 cycles. The excellent electrochemical performance of the CuO/O-doped g-C3N4 nanocomposite is attributed to the following factors: (I) the in situ growing CuO/O-doped g-C3N4 avoids CuO nanoparticle aggregation, leading to the improved lithium ion transfer and electrolyte penetration inside the CuO/O-doped g-C3N4 anode, thus promoting the utilization of CuO; (II) the porous structure provides efficient space for Li+ transfer during the insertion/extraction process to avoid large volume changes; (III) the O-doping g-C3N4 decreases its band gap, ensuring the increased electrical conductivity of CuO/O-doped g-C3N4; and (IV) the strong interaction between CuO and O-doped g-C3N4 ensures the stability of the structure during cycling.
研究领域:
材料科学
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电化学
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产品关联
DOI
PubMed
高影响因子
Electronic Materials Letters
·
2022
·Vol. 19
·期 1
·94-107
·
IF 3.151
Luo Menghao,Feng Hange,Hu Yuechuan,Chen Keke,Dong Zibo,Xue Shaolin
Abstract Photocatalytic degradation has received considerable emphasis since it shows significant possibilities in environmental pollution. In this work, ternary Z-scheme heterojunction g-C 3 N 4 /TiO 2 /Ti 3 C 2 photocatalysts are designed and fabricated. The Z-scheme heterojunctions formed on the surfaces of g-C 3 N 4 and TiO 2 dramatically modify the photocatalytic performances of the compound under illumination. Meanwhile, in this process, multilayer Ti 3 C 2 , as the transport medium of Z-scheme heterojunction, is tightly bonded to TiO 2 generated by hydrothermal oxidation and g-C 3 N 4 with large specific surface area, which effectively facilitates the space charge separation and depresses the charge recombination. When the addition amount of TiO 2 /Ti 3 C 2 is 80 mg and calcined at 450 ℃ for 4 h, g-C 3 N 4 /TiO 2 /Ti 3 C 2 has the greatest photocatalytic performance, and the kinetic constant for degradation methyl orange (MO) was about 3.62 times that of g-C 3 N 4 and 14.55 times that of Ti 3 C 2 , respectively. This work illustrates that g-C 3 N 4 /TiO 2 /Ti 3 C 2 has outstanding potential and offers novel insights for designing and synthesizing new ternary heterojunction materials. Graphical Abstract
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）