Catalysts
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2024
·Vol. 14
·期 6
·335
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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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JOURNAL OF SOLID STATE CHEMISTRY
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2024
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IF 3.2
Congtian Liu,Xiaoya Zhu,Ling Wang,Chujun Feng,Jian Rong,Zhongyu Li,Song Xu
Tetracycline antibiotics as one of the most widely used antibiotics at present, are difficult to degrade in the environment, which poses a serious threat to the ecosystem and human health. In this work, NiTiO 3 /g-C 3 N 4 composites were successfully constructed by calcination method using nickel acetate tetrahydrate as nickel source and tetrabutyl titanate as titanium source. The photocatalytic degradation efficiency of the 5 wt% NiTiO 3 /g-C 3 N 4 composite of TC can reach 88.2 % within 150 min, which was 1.4 and 2.2 times higher than that of pure g-C 3 N 4 (63 %) and NiTiO 3 (40 %), respectively. The 5 wt% NiTiO 3 /g-C 3 N 4 composite can still maintain good stability after four cycles. The experimental results showed that the construction of Z-scheme heterojunction can effectively improve the photocatalytic activity of the catalysts and maintain good redox properties at the same time. Furthermore, a possible mechanism of photocatalytic degradation of NiTiO 3 /g-C 3 N 4 heterojunction has been suggested.
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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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JOURNAL OF APPLIED POLYMER SCIENCE
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2024
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IF 2.7
Mengnan Xu,Zhiyuan Zhang,Jiajun Tao,Yan Nai,Chenglong Su,Shan Jiang
In this paper, the rare earth europium complex Eu(FTFA) 3 TPPO 2 (EuFT) was synthesized by using europium as the central ion, 4-trifluoro-1-(2-furanyl)-1,3-butanedione (FTFA) as the first ligand, and triphenylphosphine oxide (TPPO) as the second ligand. The structure was characterized by Fourier transform infrared spectroscopy (FTIR), and the photoluminescence process was investigated by UV and fluorescence spectra. The luminescent film was prepared by adding EuFT and the compatibilizer POE- g -PHEMA into the POE matrix, which can convert the UV light to the red light, and improve the photovoltaic conversion efficiency while reducing the effect of UV aging on the cell. Experimental results show that the complex can absorb UV light (200–400 nm) and emit red light (612 nm), the luminescent film also maintains good luminescence performance. The peel strength of POE/POE- g -PHEMA/EuFT film achieves 23.9 N cm −1 ，while that of POE film is 12.8 N cm −1 . The silicon cell prepared by POE/POE- g -PHEMA/EuFT film also showed higher EQE in UV region, and its current density–voltage (J–V) curve revealed that J sc increased from 33.05 to 34.25 mA/cm 2 , the conversion efficiency increased from 12.99% to 13.39%, and the relative efficiency increased by 3.08%. The rare earth europium complex effectively improved the photoelectric conversion efficiency of solar cells.
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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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JOURNAL OF POWER SOURCES
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2024
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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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CERAMICS INTERNATIONAL
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2024
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IF 5.1
Gang Huang,Danlin Zeng,Ping Ke,Yang Chen
In this paper, a series of corncob carbon modified g-C 3 N 4 composite catalyst with excellent visible light response properties was synthesized via a simple one-pot co-solvothermal method. The catalysts displayed enhanced adsorption performance and photocatalytic activity of 98.89 % and 99.08 % on Rhodamine B (RhB) and methyl orange (MO) removal efficiency under visible light irradiation, respectively. The superoxide radical and hydroxyl radical were the dominant reactive oxygen species involved in the photocatalysis reaction. The significantly enhanced adsorption and photocatalytic performance of the catalysts was ascribed to the porous structure and the strong interactions between g-C 3 N 4 and corncob carbon. After six cycles of experiments, the catalysts still exhibit stable and high performance for the removal efficiency of RhB and MO. Based on the analytical results, a possible mechanism of photocatalytic degradation was proposed in detail. The corncob carbon modified g-C 3 N 4 composites can be regarded as a potential catalyst in the application of the dye wastewater treatment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Zipan Jiao,Xinglan Zhou,Xiaoyan Lan,Haoran Zong,Yan Jing,Bingxin Liu,Peng Zhang,Benhua Xu
Graphite-phase carbon nitride quantum dots (g-C 3 N 4 QDs) have garnered widespread attention and considerable research interest as active media for resistive random-access memory (RRAM) devices owing to their exceptional physical properties. In this study, g-C 3 N 4 QDs were synthesized via ultrasonic-assisted liquid-phase exfoliation. Subsequently, the obtained g-C 3 N 4 QDs with uniform size were embedded into polyvinyl alcohol (PVA) for preparing PVA/g-C 3 N 4 QDs hybrid, and the RRAM devices with Al/g-C 3 N 4 QDs-PVA/ITO/PET structure were fabricated. The obtained memory devices exhibit bipolar resistive switching (BRS) behavior and are primarily influenced by the space charge limited conduction (SCLC) mechanism. The data retention time exceeds 10 4 s at a read voltage of 0.1 V, accompanied by an impressively low set voltage. In addition, the device exhibits a surprising temperature dependence of the resistive switching performance at different temperatures. The aforementioned properties demonstrate the significant potential of g-C 3 N 4 QDs in RRAM for data storage applications.
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Nanomaterials
·
2025
·Vol. 15
·期 6
·466
·
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
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2024
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IF 4.2
Rui Li,Zewei Wu,Yiyun Yang,Sijia Sun,Ruixin Ma,Hao Ding
A silica-loaded g-C 3 N 4 composite photocatalyst (M-SiO 2 /g-C 3 N 4 ) was prepared by grinding amorphous SiO 2 microspheres (M − SiO 2 ) with melamine and calcining the resulting grinding products. This composite was used for photocatalytic persulfate (PMS) activation to degrade carbamazepine (CBZ). The results showed that the degradation efficiencies of CBZ by M-SiO 2 /g-C 3 N 4 -2.5 (39.16 % of g-C 3 N 4 )-activated PMS were 78.92 % and 100 % after simulated sunlight irradiation for 60 and 120 min, respectively. These values were significantly greater than those of the system with pure g-C 3 N 4 (29.15 % and 42.4 %). In particular, the degradation efficiency of CBZ with M-SiO 2 /g-C 3 N 4 -2.5 decreased by only 9.47 % after 4 cycles of recycling. In the catalytic process, h + , SO 4 •− and O 2 •− were the main reactive species contributing to CBZ degradation. Compared with g-C 3 N 4 , loading g-C 3 N 4 on the surface of M − SiO 2 resulted in a decrease in g-C 3 N 4 lamellar stacking, which increased the number of active surface sites and improved the separation and migration of photogenerated carriers, improving the degradation performance.
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Carbon Letters
·
2024
·
IF 5.5
Liu Rui,Zhang Xin,Han Xue,Sun Yuan,Jin Shuang,Liu Ri-jia
Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst has been fabricated using a simple ultrasonic method with high photocatalytic activity. The morphology, structure and optical properties of Fe 3 O 4 /g-C 3 N 4 /TiO 2 were systematically investigated by a variety of characterization techniques. The optimum degradation conditions were investigated by degrading tetracycline (TC) under visible light irradiation. The results showed that the degradation efficiency was the highest when the initial TC concentration was 5.0 mg/L, the pH value was 11 and the catalyst dosage was 1.0 g/L. After 100 min of visible light irradiation, the degradation efficiency of TC achieved at 73.61%, which was 1.64 and 1.19 times that of g-C 3 N 4 and Fe 3 O 4 /g-C 3 N 4 , respectively. Moreover, Fe 3 O 4 /g-C 3 N 4 /TiO 2 had good stability and recyclability. The results of capture experiments showed that ‧O 2 − and ‧OH were the main active species during the photocatalytic process, and a possible photocatalytic reaction mechanism of Fe 3 O 4 /g-C 3 N 4 /TiO 2 catalyst was proposed. This study provides a new way to improve the photocatalytic performance of g-C 3 N 4 , which has great potential in degrading pollutants such as antibiotics in wastewater.
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CHEMICAL PAPERS
·
2025
·
IF 2.5
Chen De Xing,Long Yun Fei
In this paper, a novel copper nanoclusters (ARG-CuNCs) has been synthesized by Acid red G stabilized. The optimal excitation wavelength of the synthesized ARG-CuNCs is 330 nm, and a corresponding emission peak is 426 nm. Notably, the fluorescence intensity of ARG-CuNCs could be stablized over six months, and it exhibits minimal variation within the pH range of 2.21–11.58, indicating exceptional stability of the synthesized copper nanoclusters. It was observed that tetracycline (TC) effectively quenches the fluorescence intensity of ARG-CuNCs, and the relative fluorescence intensity change ( Q = F 0 /F) exhibiting a linear relationship with the concentration of TC in the range of 1.0–110.0 µmol/L, and the detection limit (LOD) is 0.33 µmol/L. Thus, a fluorescence-based analytical method for determining TC concentration has been developed based on the relationship of the Q value with the concentration of TC. Furthermore, leveraging a smartphone and colorimetric analysis software, a novel visual quantitative detection method for TC detection has been established based on the image of the mixture solution (TC and ARG-CuNCs) under the 365 nm ultraviolet lamp irradiation, and using ARG-CuNCs as a fluorescence probe. Graphical abstract
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