JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2019
·Vol. 102
·期 9
·5484-5493
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IF 3.094
Changcun Han,Tong Zhang,Qijun Cai,Chonghao Ma,Zhengfu Tong,Zhifeng Liu
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g-C 3 N 4 nanosheet photocatalysts by in situ chemical deposition. The built-in electric field formed by heterojunction interface of the CoP/g-C 3 N 4 composite semiconductor can accelerate the transmission and separation of photogenerated charge-hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g-C 3 N 4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron-hole separation. UV-vis DRS analysis showed that the composite had enhanced visible light absorption than pure g-C 3 N 4 and was a visible light driven photocatalyst. In this process, NaH 2 PO 2 and CoCl 2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H 2 evolution rate of 3.0 mol% CoP/g-C 3 N 4 is about 15.1 μmol h −1 . The photocatalytic activity and stability of the CoP/g-C 3 N 4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2019
·
IF 3.42
Chunlin Chen,Yi He,Guoqing Xiao,Fei Zhong,Yunqing Xia,Youqing Wu
The application of graphene (Gr) in waterborne coatings is restricted owing to its strong hydrophobic properties. Herein, graphitic (g)-C 3 N 4 , also with good barrier properties, has been used for the first time to disperse Gr in epoxy solution via simple ultrasonic vibration. The morphologies and structures of g-C 3 N 4 and Gr/g-C 3 N 4 were characterized through FT-IR, XRD, XPS, UV–vis absorption spectra, TEM and Raman spectra. Corrosion resistance performances of the g-C 3 N 4 /epoxy and Gr/g-C 3 N 4 /epoxy nanocomposites coatings were evaluated by electrochemical impedance spectroscopy (EIS) and salt spray tests. Gr/g-C 3 N 4 /epoxy nanocomposites coating exhibits improved anti-corrosion performance in contrast to g-C 3 N 4 /epoxy coating due to enhanced barrier performances.
研究领域:
材料科学
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腐蚀与防护
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yang Li,Xinyan Xiao,Zhihao Ye
A novel ellipsoidal (t-s) BiVO 4 modified g-C 3 N 4 composite photocatalyst was fabricated via a facile two-step synthesis strategy in the assistance of ultrasonic and magnetic stirring method. In this typical process, (t-s) BiVO 4 was prepared by using a modified polyol method, and the coupling process of (t-s) BiVO 4 with g-C 3 N 4 was executed after ultrasonic treatment in the ethanol system. The photocatalytic activity of the as-obtained composites was evaluated by monitoring the degradation process of Rhodamine B (RhB) under the simulated sunlight irradiation. The results revealed that the highest degradation efficiency can reach up to 97.7% in 120 min when the mass ratio of (t-s) BiVO 4 and g-C 3 N 4 came to be 1:16. And the optimum degradation rate was 0.03088 min −1 , which was 4.6 and 47.5 times faster than that of the bare g-C 3 N 4 and (t-s) BiVO 4 , respectively. The trapping experiments were conducted to verify that h + and secondary·O 2 - radicals were the main active species in the photocatalytic process. The enhanced photocatalytic performance can be attributed to the synergetic effect of the heterojunction formed at the interface of g-C 3 N 4 and (t-s) BiVO 4 , which resulted in the enlarged optical absorption range and improved separation ability of photo-induced carriers.
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
CHINESE JOURNAL OF CATALYSIS
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2017
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IF 2.813
Zhenxing Zeng,Kexin Li,Kai Wei,Yuhua Dai,Liushui Yan,Huiqin Guo,Xubiao Luo
Porous g-C 3 N 4 and supported porous g-C 3 N 4 were fabricated for the first time by a simple strategy using pretreated melamine as a raw material and pretreated quartz rod as a substrate. The formation of a richly porous microstructure can be attributed to the co-existence of different pore-fabricating units in the preparation system for porous g-C 3 N 4 . The richly porous microstructure endowed the as-prepared porous g-C 3 N 4 with an excellent photocatalytic activity. The as-prepared supported porous g-C 3 N 4 exhibited considerable stability because of the existence of chemical interaction between porous g-C 3 N 4 and the quartz rod substrate. The photocatalytic activity of the supported porous g-C 3 N 4 was competitive with that of porous g-C 3 N 4 in powder form because neither the surface migration of photogenerated electrons nor the diffusion of the target organic pollutant were affected by the construction of the quartz rod reactor. The photocatalytic activity of the as-prepared porous g-C 3 N 4 and supported porous g-C 3 N 4 was preliminarily evaluated by the treatment of single-component organic wastewater under visible-light irradiation. Subsequently, the as-prepared porous g-C 3 N 4 was further applied in conventional hydrogen evolution and a new system for simultaneous hydrogen evolution with organic-pollutant degradation. The hydrogen yield and degradation efficiency both increased with increasing photocatalytic activity of the as-prepared materials in the system for simultaneous hydrogen evolution with organic-pollutant degradation.
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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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Xin Xiao,Yaoting Wang,Huimin Zhang,Zhiling Chou,Haochen Ding,Xinyu Lu,Yiming Zou,Li Chen,Dongping Sun
This study investigated the controllable synthesis method and photocatalytic performance of a g-C 3 N 4 /MnIn 2 S 4 heterostructure. Through a carefully designed experimental scheme, the g-C 3 N 4 /MnIn 2 S 4 heterostructure was successfully prepared, and its composition, structure, and morphology were thoroughly characterized. The experimental results demonstrated that the heterostructure achieved a high photodegradation efficiency of 92.3% for RhB and 72.8% for TC under visible light, significantly outperforming its individual components. After four cycles, the degradation rate remained relatively stable. The photocatalytic reaction mechanism was thoroughly investigated by adding different trapping agents, revealing that the active species were mainly ·O₂⁻ and h⁺ and EPR, which significantly affected the degradation efficiency. The g-C 3 N 4 /MnIn 2 S 4 heterostructure achieved efficient separation of the photogenerated carriers, significantly enhancing its photocatalytic performance for RhB and tetracycline degradation. VB-XPS tests exhibited that the valence bands of MnIn 2 S 4 and g-C 3 N 4 were 1.25 and 2.25 eV, respectively. Combined with UV-vis DRS results, the calculated conduction bands are -0.79 and -0.53 eV, respectively. The study found that efficient separation between photogenerated holes and electrons in the heterostructure had a crucial impact on its photocatalytic performance.
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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产品关联
DOI
高影响因子
iScience
·
2024
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IF 4.6
Ai-Ping Yan,Yu-Jue Qiu,Xing-En Wang,Guang-Hua Wang,Xian-Kui Wei,Xin-Tian Li,Xiao-Die Chen,Xing Shang,Shun-Liu Deng,Jian-Wei Zheng,Su-Yuan Xie
C 3 N 4 is widely applied in the synthesis of single-atom catalysts. However, understanding on the active site and the reaction mechanism is not fully in consensus. Especially, bare studies have considered the coordination environment of the single-atomic dopant and the effect of nitrogen vacancy on C 3 N 4 . In this study, we found that the presence of nitrogen vacancies promotes the activation of water and reduces the activation energy barrier for hydrogen generation. The results show that a synergistic effect between single-atom Pt and nitrogen vacancies enables the catalyst to achieve a superior hydrogen production rate of 3,890 μmol/g/h, which is 16.8 times higher than that of pristine C 3 N 4 . Moreover, the catalyst is also applicable for photocatalytic hydrogen production from seawater without significantly decreased hydrogen production rate. This study paves the way for the rational design and optimization of next-generation photocatalysts for sustainable energy applications, particularly in solar-driven hydrogen production.
研究领域:
材料科学
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能源化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Jirong Bai,Wenhua Lv,Zhijiang Ni,Zhilei Wang,Gang Chen,Haiyang Xu,Hengfei Qin,Zheng Zheng,Xi Li
MoS 2 /S-doped porous g-C 3 N 4 (MoS 2 /SPGCN) hybrids were fabricated via a facile calcination and ultrasound assembly method. Structural characterization indicated MoS 2 nanosheets were successfully loaded on SPGCN isotype heterojunction hybrids. The MoS 2 /SPGCN photocatalysts showed more visible light absorption, larger specific surface area, and faster electron-hole separation. MoS 2 /SPGCN significantly accelerated Rhodamine B photodegradation under visible light irradiation, which was mainly because the enriched active sites, broadened visible light absorption, and newly-formed heterojunction between MoS 2 nanosheets and SPGCN together suppressed the recombination of photoinduced electron-hole pairs. MoS 2 /SPGCN also showed excellent recyclability and chemical stability. Thus, this work presents a good strategy of designing efficient photocatalysts by substituting the single catalyst base with metal-free isotype heterojunction hybrids.
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
Catalysis Science & Technology
·
2019
·Vol. 9
·期 10
·2571-2577
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IF 5.726
Weiliang Qi,Siqi Liu,Fei Li,Heng Jiang,Zhixing Cheng,Shanlin Zhao,Minghui Yang
Transition metal nitrides have been recognized as excellent hydrogen evolution electrocatalysts and therefore are promising alternative co-catalysts for photocatalytic hydrogen production. Herein, iron nitride (Fe2N) nanoparticles have been prepared by using MOFs as sacrificial precursors. A novel g-C3N4–Fe2N nanostructure has been fabricated by an electrostatic self-assembly method at room temperature for photocatalytic H2 evolution. MOF-derived Fe2N nanoparticles as co-catalysts can promote photo-generated charge-carrier transportation/separation and decrease the overpotential of H2-evolution. Therefore, the optimal g-C3N4–Fe2N nanocomposite exhibits an obviously improved H2 evolution rate of 88.7 μmol g−1 h−1, which is almost 48 times higher than that of pure g-C3N4 nanosheets.
研究领域:
材料科学
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能源化学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2019
·
IF 2.781
Zhilin Li,Chongyue Jin,Chunmei Lv,Min Wang,Jin Kang,Shiyu Liu,Yuanhua Xie,Tong zhu
To further promote the visible-light photocatalytic efficiency of Bi 24 O 31 Cl 10 , g-C 3 N 4 /Eu(III) doped Bi 24 O 31 Cl 10 heterojunction composites (CN/Eu-BCO) were successfully synthesized via modified solution combustion and immersion-calcination method. The effects of Eu(III) dopants and g-C 3 N 4 coupling on the micro-structures and the photocatalytic efficiency of Bi 24 O 31 Cl 10 towards Rhodamine B (RhB) degradation were investigated in detail. The results displayed that Eu(III) doping and coupling with g-C 3 N 4 can largely promote the photocatalytic efficiency of Bi 24 O 31 Cl 10 . The photodegradation rate of RhB over 5CN/0.01Eu-BCO can reach to be 91.9% in 40 min, which was 8.46 folds of Bi 24 O 31 Cl 10 , 1.91 folds of 0.01Eu-BCO, and 1.72 folds of 5CN/BCO. The main radical species being responsible for RhB degradation were ● O 2 − and ● OH. Furthermore, 5CN/0.01Eu-BCO composite photocatalyst exhibited good reusability and stability.
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
APPLIED SURFACE SCIENCE
·
2015
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IF 2.711
Liu Pi,Rui Jiang,Wangchi Zhou,Hua Zhu,Wei Xiao,Dihua Wang,Xuhui Mao
Converting the waste biomasses with high-carbon content into value-added materials is an environmental-friendly way for their utilization. In this study, a leaf-derived biochar is modified with graphitic C 3 N 4 to fulfill an affordable composite material capable of removing organic pollutants via adsorptive and photocatalytic processes simultaneously. The preparation process includes a carbonization process of chestnut leaf biomass and a followed condensation reaction of melamine at 520 °C. The characterization shows that biochar and C 3 N 4 existed in the composites in their pristine status, and the effective connection of C 3 N 4 and biochar was established. The adsorptive performance of the composites is governed by the biochar content in the composite, thus showing favorable performance for the removal of cationic dye methylene blue (MB). The condensation reaction of the melamine precursor has a coalescing effect on the dispersed biochar, resulting in the growth of particle size of composite. The composites prepared at different biochar/melamine ratios all show a photocatalytic activity on decolorization of MB. In terms of the specific photocatalytic activity of C 3 N 4 in the composite, biochar/melamine ratio of 0.5:1 is the best. Unlike the conventional adsorptive carbon materials which have saturated adsorption capacity, the composite in this study retain a sustaining decontamination capability due to the photocatalytic degradation of adsorbed organic pollutants under irradiation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Muhammad Sabir,Mahmoud Sayed,Zhuofan Zeng,Bei Cheng,Wang Wang,Chuanbin Wang,Jingsan Xu,Shaowen Cao
The photocatalytic conversion of carbon dioxide (CO 2 ) into valuable products holds great promise from environmental and economic perspectives. However, current photocatalytic materials still exhibit unsatisfactory efficiency. In this study, a notably efficient step-scheme (S-scheme) heterojunction was developed by combining the Co-MOFs with carbon nitride nanosheets (g-C 3 N 4 ). The electrostatic interaction between these components not only facilitates the exfoliation of g-C 3 N 4 layers but also enhances the stability of the photocatalyst structure. The optimal heterojunction Co-CN4 photocatalyst achieved a significantly enhanced CO production rate of 16.1 µmol g −1 h −1 , which is 4.7 times higher than that of pure g-C 3 N 4 . This improved activity is ascribed to the enhanced light absorption and mitigated charge carrier recombination. Density functional theory (DFT) computations in conjunction with experimental observations elucidate the establishment of a close contact interface. Additionally, electron paramagnetic resonance (EPR) and in situ X-ray photoelectron spectroscopy (XPS) characterization unveil the electron transfer pathway of Co-CN4 during photocatalytic CO 2 conversion. This study offers valuable insights into the design of S-scheme photocatalysts for enhancement of CO 2 photoreduction.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Xiaoyu Jiang,Xiang Li,Yumin Liu,Haifa Zhai,Gongke Wang
The preparation of ultrathin nanosheets is conducive to increasing the material's specific surface area and introducing suitable defect sites. This facilitates the enhancement of the separation efficiency of photogenerated charge carriers and improves the adsorption and degradation efficiency toward pollutants. Various nitrogen-rich precursors were employed for the synthesis of bulk g-C 3 N 4 (BCN) and its ultrathin nanosheets, with a focus on investigating their photocatalytic performance. The degree of polymerization of g-C 3 N 4 influenced its hydrogen bonding and C/N ratio, affecting the ultrathin nanosheet microstructure. Oxidation disrupted the tri- s -triazine rings in the ultrathin nanosheets of g-C 3 N 4 prepared via dicyandiamide. However, g-C 3 N 4 prepared from urea and melamine as precursors retained its primary characteristics after thermal oxidative exfoliation, attributed to interlayer hydrogen bonds, small lateral size at low polymerization degrees, and increased vacancy defects. In the photocatalytic degradation system, two-dimensional nanosheets of g-C 3 N 4 synthesized from urea exhibited the highest catalytic efficiency.
研究领域:
材料科学
·
环境科学
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化学
✓ 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）