INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Feihui Li,Ruiru Zhao,Bingye Yang,Wei Wang,Yu Liu,Jianping Gao,Yunlan Gong
Nowadays, energy shortage is one of the major problems in the world. Photocatalytic hydrogen production is a new type of energy technology with good application prospect. As a new type of photocatalytic semiconductor material, g-C 3 N 4 has attracted much attention as a photocatalyst . By ultrasonic treatment of a mixed solution of g-C 3 N 4 and bovine serum albumin, followed by adding a certain amount of silver nitrate solution and then directly hydrothermal treatment , a special dandelion-like g-C 3 N 4 /Ag (D-g-C 3 N 4 /Ag) was prepared. The scanning electronic microscopy, transmission electronic microscopy , X-ray diffraction, Fourier transform infrared, fluorescence and physicochemical adsorption methods were used to characterize the morphology and structure of D-g-C 3 N 4 /Ag. In addition, the photocatalytic H 2 production of D-g-C 3 N 4 /Ag with different Ag loadings or in different sacrificial agents and different pH conditions were investigated. The results indicated that when triethanolamine was used as sacrificial agent, photocatalytic hydrogen efficiency was the best, and the rate of photocatalytic hydrogen production reached 862 μmol g −1 h − 1 as the Ag loading was 4%.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
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2023
·
IF 2.7
Yue-Feng Tang,Meng-Yun Zhao,Guo-Zhi Han
Herein, a novel composite of g-C 3 N 4 and silver nanoparticles(g-C 3 N 4 @Ag) with enhanced bifunctional catalytic activity through chemical etching is reported. A kind of g-C 3 N 4 @Ag composite by one-pot route, then treated the product with sodium borohydride (NaBH 4 ) solution for a certain time is first synthesized. The property and morphology of the g-C 3 N 4 @Ag composite changed greatly after the treatment. Compared with the pristine g-C 3 N 4 @Ag composite, the NaBH 4 -etching endowed g-C 3 N 4 @Ag composite (RACN) with smoother two-dimensional plane structure, as well as an extension of the conjugate system which originating from the stronger chemical connection between the Ag nanoparticles and g-C 3 N 4 . Furthermore, research results indicated that the RACN showed superior broad-spectrum catalytic performance for the reduction of aromatic nitro compounds, and the catalytic efficiency of the RACN is enhanced dozens of times by the treatment. Moreover, the photocatalytic activity of the RACN is also greatly improved. This discovery provides an efficient and facile method toward the enhancement of catalytic activity of semiconductor and metal nanoparticle composites by chemical etching.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2017
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IF 0
Jun Liu,Qingyong Tian,Zhaohui Wu,Weijing Yao,Xiangheng Xiao,Wei Wu
Trinary g-C 3 N 4 /Ag/Ag 3 PO 4 heterostructures with different Ag content were designed and synthesized by in situ deposition and reduction routes. The photocatalytic performances of these heterostructures were investigated under visible light (λ > 450 nm) and simulated sunlight. Moreover, the influence of Ag content and ratio of each component on the photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 was also studied. As a result, the photocatalytic activities of all these g-C 3 N 4 /Ag/Ag 3 PO 4 samples were higher than commercial P25 (TiO 2 ). Moreover, sample S1 (the ratio of g-C 3 N 4 , Ag 3 PO 4 and Ag is 1: 2.52: 0.12) showed the better photocatalytic activities than other g-C 3 N 4 /Ag/Ag 3 PO 4 samples (S2 and S3) and g-C 3 N 4 /Ag 3 PO 4 (1: 3) under the same light irradiation. It indicated that small amount of Ag nanoparticles could improve the photocatalytic performances by compared with g-C 3 N 4 /Ag 3 PO 4 sample. And S1 showed a stable photodegradation after 6 times of cycle experiments under simulated sunlight. The stable and significant superior photocatalytic performance of g-C 3 N 4 /Ag/Ag 3 PO 4 could be attributed to the fast charge separation among g-C 3 N 4 , Ag and Ag 3 PO 4 during the Z -scheme charge transfer and recombination process.
研究领域:
材料科学
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环境科学
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DOI
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Tiantian Yang,Zibo Dong,Inaam Ullah,Ayesha Irfan,Jun He,Jinhe Qi,Mai Li
Efficient interfacial carrier transfer and separation can effectively enhance the photocatalytic performance. Herein, a high-performance g-C 3 N 4 /Ag/BaTiO 3 heterostructure was constructed, which showed promising results in photocatalytic nitrogen fixation and tetracycline degradation. Specifically, Ag-modified tetragonal barium titanate (BaTiO 3 ) nanoparticles were combined with flower-like spherical graphitic carbon nitride (g-C 3 N 4 ) to prepare the g-C 3 N 4 /Ag/BaTiO 3 photocatalyst. The Ag nanoparticles were uniformly distributed on BaTiO 3 through photodeposition, which was subsequently loaded onto g-C 3 N 4 , offering abundant surface active sites and a large surface area for enhanced photocatalytic activity. Four types of composite photocatalysts were prepared. The 1:3-g-C 3 N 4 /Ag/BaTiO 3 photocatalytic composite, composed of g-C 3 N 4 and Ag/BaTiO 3 in a 1:3 ratio, achieved an impressive nitrogen fixation rate of 765.85 μmol g −1 h −1 , greatly exceeding that of pure g-C 3 N 4 and BaTiO 3 by factors of 2.14 and 3.88, respectively. Also 1:3-g-C 3 N 4 /Ag/BaTiO 3 had the highest tetracycline degradation rate of 82.7 %. It was found that the significant improvement of photocatalytic efficiency could be attributed to the ultrasonic vibration-induced piezoelectric polarization of BaTiO 3 , which generates an intrapolar electric field. Additionally, the noble metal Ag nanoparticles with surface plasmon resonance (SPR) effect can be used as electronic mediators to promote charge separation and transfer to form all-solid Z-type heterojunctions. This Z-type heterojunction effectively minimizes the recombination of photogenerated charge carriers of electrons and holes. Studies have shown that this composite photocatalyst exhibits excellent performance in both photocatalytic nitrogen fixation and the degradation of organic pollutants, highlighting the great potential of this composite heterojunction in photocatalysis.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Congyu Wang,Zepeng Rao,Asad Mahmood,Xiao Wang,Yan Wang,Xiaofeng Xie,Jing Sun
In the process of photocatalytic oxidation (PCO), titanium dioxide (TiO 2 ) shows excellent capabilities. However, when TiO 2 is used to remove volatile organic compounds (VOCs), there are some drawbacks including weak adsorption of gaseous contaminants, insufficient utilization of sunlight, and rapid recombination of photogenerated carriers. Herein, a TiO 2 -based ternary heterogeneous photocatalyst, g-C 3 N 4 /Ag-TiO 2 , was successfully fabricated to photodegrade gaseous acetaldehyde (one of the representatives of oxygenated VOCs) under visible light. Among the various samples, the g-C 3 N 4 /50 wt% Ag-TiO 2 exhibited an excellent photocatalytic activity , which was 5.8 times of bare TiO 2 . The mineralization efficiency of acetaldehyde was also increased by 3.7 times compared to bare TiO 2 . The substantial improvement in the PCO performance of the ternary system can be associated with the good adsorption to acetaldehyde gas and light-harvesting capability, as well as improved charge separation process. The application of Langmuir-Hinshelwood kinetic model suggested that relative humidity played a significant role in the VOCs degradation. Also, the photodegradation of gaseous acetaldehyde primarily occurred on the catalysts surface. Based on several characterizations, i.e., UV–vis spectroscopy, photoluminescence spectrum, photocurrent spectroscopy and electron spin-resonance test, a suitable degradation mechanism is proposed. This study provides a novel ternary photocatalyst with improved photocatalytic performance and stability, which can be used for the low-concentration VOCs abatement in the indoor environment.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Fei Liu,Thien-Phap Nguyen,Qin Wang,Florian Massuyeau,Yi Dan,Long Jiang
Constructing a conductive interface is crucial for the transfer of photoexcited charges in the photocatalytic heterojunction system. In this study, we introduced Ag into g-C 3 N 4 /P3HT system to construct a conductive interface which benefits for transfer of photoexcited charges between g-C 3 N 4 and P3HT. A series of characterizations were employed to investigate the chemical structure , morphology and optical property of the obtained catalysts. And the photocatalytic activity of the as-prepared g-C 3 N 4 /Ag/P3HT composites were evaluated by the degradation of tetracycline (TC) and methyl orange (MO) aqueous solution under visible light irradiation. Results show that the g-C 3 N 4 /Ag/P3HT exhibits a broad absorption band in the region of 400–700 nm and the photocatalytic activity of g-C 3 N 4 /Ag/P3HT obtains a great improvement comparing with that of g-C 3 N 4 , g-C 3 N 4 /Ag and g-C 3 N 4 /P3HT. In addition, the optimized loading content of P3HT is 0.3 mass% based on g-C 3 N 4 . The enhanced photocatalytic performance is due to the introduction of Ag, which improves the transfer of photoexcited charges between g-C 3 N 4 and P3HT. The active species trapping experiment shows that the main active specie is O 2− . After five recycling experiments, the g-C 3 N 4 /Ag/P3HT shows high stability in the photocatalytic performance.
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
FOOD CHEMISTRY
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2024
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IF 8.5
Xiaojun Wen,Yiting Liu,Weilong Zhang,Lijun You,Ning Cai,Jumei Li
In this research, we fabricated an innovative NiO/CN/Ag composite through the straightforward electrostatic assembly of Ag nanoparticles and g-C 3 N 4 sheets onto NiO nanoflowers. This composite enables both surface enhanced Raman spectroscopy (SERS) detection and photo-degradation of pesticides. The results reveal NiO/CN/Ag can quantitatively detect thiram (TRM) and diquat dibromide (DQDB) in water, with a limit of detection (LOD) of 10 −9 M, and also exhibit outstanding photo-degradation efficiency, exceeding 95 % for TRM and DQDB within 90 min under simulated sunlight. Significantly, after the organic reagent (citric acid) on NiO/CN/Ag was completely removed through simulated solar irradiation, the signal-to-noise ratios of SERS spectra on NiO/CN/Ag were enhanced, achieving LODs of 10 −8 M for TRM and DQDB in different fruit juices and dried flower teas. Additionally, the composite demonstrate impressive recyclability, maintaining robust SERS signals and high degradation rates even after five cycles of “detection-degradation” processes.
研究领域:
环境科学
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分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2024
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IF 5.3
Huan Cheng,Kuang Luo,Xiaojun Wen,Lijun You,Ning Cai,Jumei Li
In this work, we proposed a straightforward self-assembly and in-situ deposition protocol to construct Cu 2 O/g-C 3 N 4 /Ag composites, which demonstrated peroxidase-like attribute and exceptional SERS activity. These composites proved to be an effective SERS analysis tool for detecting organic fungicides like malachite green (MG) and crystal violet (CV). Remarkably, they achieved detection limits as low as 10 −9 M in DI water as well as fish pond water, and exhibited a strong linear correlation between logarithmic concentrations and SERS intensities (R 2 ≥ 0.97). Beyond that, with the aid of hydrogen peroxide (H 2 O 2 ), the peroxidase-like Cu 2 O/g-C 3 N 4 /Ag composites rapidly degraded MG and CV molecules within just 5 min. Furthermore, their practical reusability based on the peroxidase-like reaction was proved by high SERS performance across 5 detection cycles. These results emphasize the immense potential of Cu 2 O/g-C 3 N 4 /Ag in SERS-based trace fungicide detection and suggest future applications in ecological restoration through peroxidase-like reactions.
研究领域:
分析化学
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环境科学
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材料科学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2021
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IF 8.198
Xiuting Li,Hongmei Liu,Ying Chen,Chenjie Gu,Guodong Wei,Jun Zhou,Tao Jiang
Pesticides and additives, extensively used in the raw agriculture samples and processed food, have attracted tremendous interests owing to their latent menace to the surroundings and human health. Herein, a rationally designed multifunctional polymethyl methacrylate-silver/graphite-like carbon nitride/silver (PMMA–Ag/g-C3N4/Ag) hybrid substrate with plasmonic-enhanced intrinsic Raman signals was exploited and served as a recyclable and quantitative surface-enhanced Raman scattering (SERS) sensor. Especially, the as-prepared flexible substrate with an electromagnetic enhancement factor of 1.64 × 106 could realize the sensitive monitoring and in-situ degradation of thiabendazole (TBZ) and carmine acid (CA) on apple or in applesauce with limits of detection as low as 2.29 × 10–6 and 6.76 × 10–5 mg/mL. Furthermore, heightened linear correlations with coefficients of 0.996 and 0.997 were accurately acquired using the film peak of PMMA as an internal standard. It was proved that the proposed sophisticated substrate may present attractive superior-in-practice multiplexed quantitative monitoring and facile decomposing of harmful molecules. The resulting recovery values distributed from 60.9 to 126% for the deeply processed foods that were decorated by 10–4 to 1 mg/mL CA together with TBZ.
研究领域:
分析化学
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环境科学
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食品安全
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Huiqin Wang,Jingru Guan,Jinze Li,Xin Li,Changchang Ma,Pengwei Huo,Yongsheng Yan
In this work, the ordered mesoporous CeO 2 (m-CeO 2 ) was successfully fabricated via the nanocasting pathway, through using SBA-15 as a hard template. Besides, g-C 3 N 4 /Ag/m-CeO 2 composite was successfully constructed by calcination method. Meanwhile, the obtained samples were investigated by series of test techniques. The XRD, SEM and TEM results show that the m-CeO 2 and Ag/m-CeO 2 with the ordered mesoporous trait. Besides, the EPR, Raman and XPS results suggest that the oxygen vacancies (O v ) and Ce 3+ and Ce 4+ are in g-C 3 N 4 /Ag/m-CeO 2 . In addition, the ordered mesostructure is favorable for the CO 2 molecular movement and adsorption/desorption reaction. The g-C 3 N 4 nanosheets, a promising material possessing suitable conductor band, large specific area, non-toxicity, and outstanding chemical stability, is a candidate semiconductor for CO 2 conversion. The introduction of g-C 3 N 4 nanosheets to Ag/m-CeO 2 overcomes the photocorrosion of Ag nanoparticles and Ag facilitate the transfer of photogenerated electrons. The photocatalytic activity results show that when the loading of Ag is 7 wt%, the g-C 3 N 4 /7Ag/m-CeO 2 composite exhibits the superiority activity for CO 2 photoconversion to CO (13.94 μmol/g) and CH 4 (7.39 μmol/g) under UV-irradiation in 10 h.
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
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2019
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IF 5.155
Wei Li,Qiong Ma,Xiao Wang,Shu-ao He,Min Li,Longfang Ren
Due to the increasing pressure of social environment and the increasing demand of human for energy, it is urgent to seek a sustainable and pollution-free new energy. Hydrogen is considered as a new type of energy because of its high calorific value , no environmental pollution and low cost of raw materials. In this experiment, to improve the visible-light driven catalytic activity of two-dimensional g-C 3 N 4 , g-C 3 N 4 and Ag/AgBr nanoparticles (NPs) were used as the carrier and cocatalyst, and the g-C 3 N 4 /Ag/AgBr (CNAA-α, α = 1, 2 and 3) heterojunction photocatalysts with different amounts of Ag/AgBr were synthesized via solvothermal technology. The morphology, composition , structure, photochemical and electrochemical characteristics of the samples were analyzed through XRD , FTIR , TEM , XPS and a series of photoelectrochemical characterizations, and the visible-light driven catalytic hydrogen evolution activities of the samples were studied by catalyzing water splitting. Research showed that the CNAA-2 exhibited the smallest overvoltage (86.5 mV vs RHE) and Tafel slope (61.0 mV·dec −1 ), so that the highest photocatalytic activity (47.84 μmol·g −1 ·h −1 ) for hydrogen evolution was obtained at the absence of Pt co-catalyst. Furthermore, this heterojunction photocatalyst exhibited good photostability and could be recycled several times with no significant decrease of its activity. This indicated that the addition of Ag/AgBr NPs to the two-dimensional g-C 3 N 4 nanosheets to construct an effective p-n heterojunction system at their interfaces could promote the conduction of photo-induced carriers and inhibit their combination, so that it would significantly improve the photoresponse ability and catalytic activity of two-dimensional g-C 3 N 4 nanosheets.
研究领域:
材料科学
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环境科学
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能源科学
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DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 39
·22095-22102
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IF 2.936
Yunfeng Ma,Lili Yang,Yong Yang,Yusi Peng,Yuquan Wei,Zhengren Huang
In this study, g-C3N4/Ag hybrid nanostructures were fabricated by facilely decorating silver nanoparticles on atmosphere-treated g-C3N4 and served as efficient SERS-active substrates. The observed significant SERS enhancement of crystal violet (CV) molecules on g-C3N4/Ag could be attributed to the high ability to concentrate target molecules through π–π stacking interactions and the near-field enhancement caused by the boosting SPR effect of the Ag NPs. The atmosphere and calcination time have a considerable impact on the SERS enhancement effect of the g-C3N4/Ag substrate. Furthermore, it took only 10 min to degrade dye molecules under visible light, and after 6 cycles the g-C3N4/Ag substrates still maintained sensitive SERS activity. This research indicates that g-C3N4/Ag hybrids can be applied as reusable SERS substrates.
研究领域:
材料科学
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光谱学
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环境科学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）