JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 28
·期 2
·1271-1280
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IF 1.798
Wang Wenwen,Yang Dongjiang,Yang Weiyou,Sun Jin,Hou Huilin
The wide application of the titanium dioxide (TiO 2 ) as the photocatalysts is greatly hindered by its intrinsic large band gap and usually fast electron–hole recombination. Here, we reported the exploration of coupling g-C 3 N 4 nanoflakes to TiO 2 nanotubes with the anatase and TiO 2 (B) mixed phases (TiO 2 (AB)) toward the efficient visible-light-driven hybrid photocatalyst. It is found that coupling TiO 2 (AB) nanotubes with g-C 3 N 4 nanoflakes could bring a profoundly extension the visible light adsorption capacity and enhanced photogenerated carrier separation. Accordingly, they exhibit much higher efficient photocatalytic activities toward the degradation of sulforhodamine B under the visible light irradiation, which is enhanced for nearly 15 times to those of the TiO 2 (AB) and g-C 3 N 4 , suggesting their promising practical applications as novel and efficient semiconductor photocatalysts for the water purification.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Mengli Li,Lingxia Zhang,Xiangqian Fan,Meiying Wu,Min Wang,Ruolin Cheng,Linlin Zhang,Heliang Yao,Jianlin Shi
We have synthesized a series of LaPO 4 /g-C 3 N 4 core-shell nanowires via an in-situ hydrothermal growth of LaPO 4 nanorods in tubular g-C 3 N 4 and investigated their photocatalytic activity in CO 2 reduction. It was found that in the synthesized core-shell structure, the outer g-C 3 N 4 nano-shells coated on the LaPO 4 nanorod cores resulted in the enhanced light absorption and charge carrier separation/transfer ability, thus improved the room temperature photocatalytic performance of the nanocomposites in CO 2 photocatalytic reduction compared with the g-C 3 N 4 and LaPO 4 individuals. A maximum CO yield of 0.433 μmol has been obtained from CO 2 reduction within 1 h irradiation on 30 mg nanocomposite photocatalyst under the absence of any noble metal. Finally, a possible mechanism, which is featured with LaPO 4 activation due to significantly promoted separation/transfer of photo-generated charge carriers, was proposed. The encouraging performance in CO 2 photoreduction demonstrates that this novel nanocomposite will be a prospective material in environmental protection and energy conversion.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2016
·
IF 2.477
Xiaojuan Zhao,Jiajie Yu,Hongda Cui,Tianhe Wang
In this study, for the first time, BSO/g-C 3 N 4 composite photocatalysts were synthesized by high temperature solid-state reaction method. The influence of systematically varied g-C 3 N 4 contents on the photocatalytic activity was investigated in detail. The photocatalytic activity of the catalysts was evaluated through the degradation of methylene blue (MB) and acid red 18 (AR 18) as target pollutants under visible light irradiation. The results demonstrated the photocatalytic performance of the BSO/g-C 3 N 4 composites was greatly enhanced compared to pure photocatalyst. In addition, the optimized photocatalytic efficiency for MB and AR 18 was achieved when the mass percentage of g-C 3 N 4 in the composite was 60%. And based on our analysis, it is proposed that the BSO/g-C 3 N 4 has the characteristic of direct Z-scheme type photocatalyst. The excellent photocatalytic performance was interpreted in terms of enhanced visible light absorption and efficient separation of electrons and holes. Compared with hydrothermal method, this method only involves sintering in air at a moderately elevated temperature, so it is efficient and more preferred for industrial scale production.
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CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Suyun Zhang,Lina Gao,Dongliang Fan,Xiaomeng Lv,Yuan Li,Zaoxue Yan
Herein, we rationally designed 3D carbon nitride hierarchical architecture with an interconnected network of graphene-analogue nanosheets and doped with boron through co-condensation strategy. XPS spectra confirmed the incorporation of boron atoms in the polymeric g-C 3 N 4 , while X-ray diffraction and IR indicated the characteristic structural properties of pristine g-C 3 N 4 and boron-doped g-C 3 N 4 (B x -GCN). The B x -GCN shows promising electrocatalytic activity and stability in the reduction of p-nitrophenol according to cyclic voltammograms analysis. Additionally, the use of this metal-free, organic, semiconducting polymer as an electrocatalyst would open wide application of hybrid carbon nitride materials from both point view of economy and environment.
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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.
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RSC Advances
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2017
·Vol. 7
·期 72
·45369-45376
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IF 3.108
Ke Xu,Jian Feng
New types of LaFeO3/g-C3N4 heterostructures were successfully prepared and the enhanced photocatalytic hydrogen evolution and degradation activities under visible light irradiation were determined. They possessed the features of a Z-scheme photocatalysis system. The photoexcited electrons on the conduction band of LaFeO3 were transferred to the valence band of g-C3N4 by the solid–solid intimately contacted interfaces, where the electrons and holes were recombined, and thus improved the separation of photogenerated electrons and holes of g-C3N4. The LaFeO3/g-C3N4 heterostructures showed a higher hydrogen evolution rate and a higher amount of ˙OH than pure LaFeO3 and g-C3N4. The construction of the LaFeO3/g-C3N4 heterostructures was used to demonstrate an effective strategy for improving the photocatalytic property. The 5%-LaFeO3/g-C3N4 exhibited the highest photodegradation and water splitting rate. More than 95% of methylene blue (MB) was degraded after 15 min in the presence of 25 mg EDTA-2Na in 100 mL MB solution which was irradiated using a 3 W light-emitting diode. The 5%-LaFeO3/g-C3N4 heterojunction nanocomposite had a maximum hydrogen evolution rate of 158 μmol g−1 h−1.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mei Xue,Zhiwen Ma,Yali Pan,Sihui Mao,Yingqiang Sun,Yupeng Yuan
Using photoluminescent (PL) graphitic carbon nitride (g-C 3 N 4 ) to convert ultraviolet (UV) light into chloroplast absorbed blue or near infrared (NR) is an attractive methodology to facilitate sunlight energy storage and carbon sequestration by microalgae. However, most researches focus on inhibiting water bloom by g-C 3 N 4 , applying PL g-C 3 N 4 to promote growth of microalgae is rarely reported. Accordingly, PL g-C 3 N 4 is synthesized by a microwave heating method and co–cultured with Chlorella vulgaris ( C. vulgaris ) with concentration of 0, 50, and 250 mg/L, named as C. vulgaris -0, C. vulgaris -50, and C. vulgaris -250, respectively, to study effect of PL g-C 3 N 4 on growth of C. vulgaris . Results indicate that there is no significant effect of microwave synthesized g-C 3 N 4 on morphology of microalgae cells, while cell viability and growth rate of C. vulgaris -50 is obviously enhanced. Further analysis indicates that, on the one hand, PL fluorescence at 615 nm enlarges light absorption of microalgae; on the other hand, photogenerated electrons by g-C 3 N 4 accelerate electron transfer in photosystem, subsequently enhancing formation of NADPH and ATP, which is favorable to growth of microalgae. Metabolism analysis illustrates that glucose, fructose, and galactose, involved in glycolysis and photosynthesis, are all up-regulated in C. vulgaris -50 group. This work reveals low concentration of PL g-C 3 N 4 facilitates protein synthesis and energy metabolism through enhancing light absorption and electron transfers, providing a biochemical strategy to enhance carbon sequestration.
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JOURNAL OF POWER SOURCES
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2024
·
IF 8.1
Jiwei Xie,Zhenggang Jia,Mingfang Qian,Hsu-Sheng Tsai,Congyan Bai,Xuexi Zhang
Stable Zn anodes with high coulombic efficiency is important for the development of safe, low-cost and environmentally friendly aqueous zinc-ion batteries (AZIBs). However, the performance of Zn anode in AZIBs is deteriorated by its dendrite growth, the corrosion caused by irreversible hydrogen precipitation, and the side reactions occurring during the charge-discharge process. The coating of protective layers on Zn anodes is one of the feasible strategies to overcome these drawbacks. Herein, we coated the chemically stable graphite-phase carbon nitride (g-C 3 N 4 ) nanosheets on Zn anodes and well overcome its aggregation to create a homogeneous g-C 3 N 4 layer. This g-C 3 N 4 layer possesses a porous structure and abundant active sites favoring the homogeneous deposition of Zn. At the current density of 5 mA cm −2 , the g-C 3 N 4 @Zn electrodes provide an ultra-long cycle life over 1300 h. The full-cells assembled with MnO 2 also exhibit excellent discharge capability and capacity retention. This study advances the application of carbon-related nanomaterials as protective coating layers for Zn anodes, which may further facilitate the exploitation on aqueous energy storage systems.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2025
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IF 4.7
Na Liu,Yanwei Su,Siyi Zheng,Yuchen Tang,Chunxia Yu,Yuangang Li,Lihua Shen
Sulfur nanosheets (S-NSs), as a novel photocatalyst, was designed to composite with graphite phase nitrogen carbide (g-C 3 N 4 ) to form a kind of new S-NSs/g-C 3 N 4 (CNS) photocatalyst. The modulating effect of bovine serum albumin (BSA) or poly (3,4-ethylenedioxythiao)-polystyrene sulfonic acid (PEDOT:PSS) ligands on the photocatalytic activity of CNS nanocomposite was studied. The ligands mainly affect the band gap and conduction band potential of the photocatalyst, leading to different photocatalytic activities. When BSA was used as a ligand, the combine of S-NSs and g-C 3 N 4 (CNS-B) cannot improve the photocatalytic activity for the degradation of Rhodamine B (RhB). When PEDOT:PSS was used as a ligand, the composite catalysts of CNS-P significantly improved the photocatalytic activity. The degradation efficiency of composite material CNS-P for RhB and Doxycycline hydrochloride (DOX) can reach 97 % (90 min) and 78 % (90 min). Since the combine of S-NSs and g-C 3 N 4 , the photoelectric conversion ability was enhanced and the carrier mobility was accelerated. The composite catalyst enhanced the redox ability and suppressed the recombination of photo generated carriers through Z-type charge transfer. This study give a reference for designing a new photocatalysts of two dimensional materials and also provide a potential feasibility for antibiotic degradation application.
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Nanomaterials
·
2025
·Vol. 15
·期 6
·466
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IF 4.3
Yu Lu,Chengbao Liu,Leizhi Zheng,Feng Chen,Junchao Qian,Xianrong Meng,Zhigang Chen,Sheng Zhong,Bin He
The introduction of nitrogen defects in graphitic carbon nitride (g-C3N4) has the important effect of improving its photocatalytic performance. This study employs a simple and environmentally friendly one-step pyrolysis method, successfully preparing g-C3N4materials with adjustable N3Cdefect concentrations through the calcination of a urea and ammonium acetate mixture. By introducing N3Cdefects and adjusting the band structure, the conduction band of the g-C3N4was shifted downward by 0.12 V, overcoming the traditional application limitations of N3Cdefects and enabling an innovative transition from enhanced oxidation to enhanced reduction capabilities. This transition significantly enhanced the adsorption and activation of O2. Characterization results showed that the introduction of N3Cdefects increased the specific surface area from 44.07 m2/g to 87.08 m2/g, enriching reactive sites, while narrowing the bandgap to 2.41 eV enhanced visible light absorption capacity. The g-C3N4with N3Cdefects showed significantly enhanced photocatalytic activity, achieving peak performance of 54.8% for tetracycline (TC), approximately 1.5 times that of the original g-C3N4, with only a 5.4% (49.4%) decrease in photocatalytic efficiency after four cycles of testing. This study demonstrates that the introduction of N3Cdefects significantly enhances the photocatalytic performance of g-C3N4, expanding its potential applications in environmental remediation.
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PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Hong Cao,Bing Zhang,Wei Wang,Yongzhao Li,Mengke Jia,Weihe Yu,Longmin Liu,Jianying Huang,Huaiyin Chen,Yuekun Lai,Weilong Cai
Polyphenylene sulfide (PPS), commonly used as a core material for high-temperature flue gas treatment, exhibits elevated viscosity when processed even at temperature exceeding 280 °C. In this study, a novel high-flowability PPS-based composite was fabricated through the incorporation of graphitic carbon nitride (g-C 3 N 4 ) via a well-established melt extrusion procedure. The enhancement of flowability in PPS was verified, and the material's texture structures and fundamental properties of composites with varying contents were determined. The composites exhibit well-dispersed g-C 3 N 4 , a significant reduction in shear viscosity (>10 %), a notable increase in melt index (>30 %), improved crystallinity , and comparable or superior performance compared to pure PPS. When the g-C 3 N 4 was introduced into the PPS matrix, a phase-separated composite structure was formed. This structure reduces the entanglement degree between the PPS molecular chains and provides more space for free-movement of the PPS chains, and thus the improvement in flowability for the composites can be clearly demonstrated. Therefore, g-C 3 N 4 can be used as a novel flow modifier to enhance the flowability and stability of PPS resin without compromising its fundamental properties, which offers significant prospects for improving productivity, optimizing energy usage, and managing costs for PPS-based products.
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Catalysts
·
2024
·Vol. 14
·期 6
·335
·
IF 3.8
Peng Jiang,Yang Yu,Kun Wang,Wenrui Liu
Excessive emissions of carbon dioxide have led to the greenhouse effect and global warming. Reducing carbon dioxide into high-value-added chemicals through solar energy is a promising approach. Herein, a g-C3N4/TiO2heterojunction photocatalyst with efficient electron transfer is designed for photocatalytic CO2reduction. The CH4(18.32 µmol·h−1·g−1) and CO (25.35 µmol·h−1·g−1) evolution rates of g-C3N4/TiO2are higher than those of g-C3N4and TiO2. The enhanced photocatalytic CO2reduction performance is attributed to the efficient charge carrier transfer in the g-C3N4/TiO2heterojunction. The electron transfer route was verified by in situ irradiated X-ray photoelectron spectroscopy (XPS). The photocatalytic CO2reduction mechanism on g-C3N4/TiO2was investigated by in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). This work provides a strategy for designing a polymer/metallic oxide heterojunction with efficient electron transfer for enhanced photocatalytic CO2reduction.
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