Materials Research Express
·
2017
·Vol. 4
·期 1
·015603
·
IF 1.068
Bo Yu,Yongkun Liu,Guohua Jiang,Depeng Liu,Weijiang Yu,Hua Chen,Lei Li,Qin Huang
In this paper, the electrospun Ag nanoparticles and g-C3N4 (Ag/g-C3N4) loaded composite carbon nanofibers were successfully prepared combing the electrospinning technology and carbonization treatment. The composition and microstructure of the resultant composite nanofibers were characterized by x-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM) and x-ray photoelectron spectrometry (XPS). Due to the synergistic effect between catalytic activity of Ag nanoparticles (NPs) and g-C3N4 and excellent adsorption capacity of carbon nanofibers, the resultant electrospun Ag/g-C3N4 loaded composite carbon nanofibers exhibited excellent conversion of 4-nitrophenol to 4-aminophenol and benzylamine to N-benzylbenzaldimine. The resultant hybrid carbon composite nanofibers offer the significant advantages, such as low dosage, high catalytic activity, easy recycling and excellent stability.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Rui Liu,Xin Zhang,Tianheng Wu,Rijia Liu,Wenyu Cui,Yuan Sun,Binqiao Ren
Developing efficient and sensitive techniques for detecting ofloxacin (OFL) residues is crucial for ensuring food safety and environmental protection. In this study, the electropolymerization method was utilized with polypyrrole (Ppy) as the functional monomer and OFL as the template to produce a molecularly imprinted composite material comprising silver (Ag) and graphitic carbon nitride (g-C 3 N 4 ) (MIP-Ag/g-C 3 N 4 /GCE) for the electrochemical detection of OFL. The electrochemical characterization was conducted using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, the prepared sensor demonstrated decent sensitivity and selectivity using the differential pulse voltammetry (DPV) technique. The sensor demonstrated an optimal linear range of 10 −13 to 10 −11 mol L −1 , with a low limit of detection (LOD) of 8.842×10 −14 mol L −1 and a limit of quantification (LOQ) of 2.947×10 −13 mol L −1 , which can successfully detect OFL in milk and honey samples, showing a recovery range of 97.38–104.00 %, and 99.45–102.00 %, with relative standard deviations (RSD) below 2.82 % and 2.16 % (n=5), respectively. The sensor exhibited high selectivity, high stability, and decent reproducibility in OFL determination. This study offers valuable insights into the application of semiconductor-based electrochemical sensors, opening new possibilities for the field and contributing to the improvement of food safety and environmental protection.
研究领域:
分析化学
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食品安全
·
环境科学
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DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 16
·2317
·
IF 4.7
Peng Jiang,Kun Wang,Wenrui Liu,Yuhang Song,Runtian Zheng,Lihua Chen,Baolian Su
Converting carbon dioxide (CO2) into high-value-added chemicals using solar energy is a promising approach to reducing carbon dioxide emissions; however, single photocatalysts suffer from quick the recombination of photogenerated electron–hole pairs and poor photoredox ability. Herein, silver (Ag) nanoparticles featuring with localized surface plasmon resonance (LSPR) are combined with g-C3N4to form a Schottky junction for photothermal catalytic CO2reduction. The Ag/g-C3N4exhibits higher photocatalytic CO2reduction activity under UV-vis light; the CH4and CO evolution rates are 10.44 and 88.79 µmol·h−1·g−1, respectively. Enhanced photocatalytic CO2reduction performances are attributed to efficient hot electron transfer in the Ag/g-C3N4Schottky junction. LSPR-induced hot electrons from Ag nanoparticles improve the local reaction temperature and promote the separation and transfer of photogenerated electron–hole pairs. The charge carrier transfer route was investigated by in situ irradiated X-ray photoelectron spectroscopy (XPS). The three-dimensional finite-difference time-domain (3D-FDTD) method verified the strong electromagnetic field at the interface between Ag and g-C3N4. The photothermal catalytic CO2reduction pathway of Ag/g-C3N4was investigated using in situ diffuse reflectance infrared Fourier transform spectra (DRIFTS). This study examines hot electron transfer in the Ag/g-C3N4Schottky junction and provides a feasible way to design a plasmonic metal/polymer semiconductor Schottky junction for photothermal catalytic CO2reduction.
研究领域:
材料科学
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环境科学
·
化学
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DOI
PubMed
高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 18
·1443
·
IF 4.3
Shicheng Liu,Na Li,Qulan Zhou
Elucidating the mechanisms of CO2photocatalytic conversion systems is crucial for tackling the challenges of carbon neutrality. In this study, a series of Ag@g-C3N4photocatalysts were constructed with metal particle size modulation as the core strategy to systematically reveal the modulation mechanism of Ag nanoparticles (Ag NPs) size variation on the selectivity of CO2photoreduction products. Systematic characterizations revealed that increasing Ag size enhanced visible light absorption, promoted charge separation, and improved CH4selectivity. Photocatalytic tests showed Ag3.0%@CN achieved optimal activity and electron utilization. Energy band analyses indicated that Ag modification preserved favorable conduction band positions while increasing donor capacity. Further density-functional theory (DFT) calculations reveal that Ag NPs size variations significantly affect the adsorption stability and conversion energy barriers of intermediates such as *COOH, CO and CHO, with small-sized Ag7NPs favoring the CO pathway, while large-sized Ag NPs stabilize the key intermediates and drive the reaction towards the CH4pathway evolution. The experimental and theoretical results corroborate each other and clarify the dominant role of Ag NPs size in regulating the reaction path between CO and CH4. This study provides mechanistic guidance for the selective regulation of the multi-electron reduction pathway, which is of great significance for the construction of efficient and highly selective CO2photocatalytic systems.
研究领域:
材料化学
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光催化
·
环境科学
·
能源化学
·
纳米材料
·
表面科学
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物理化学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2025
·
IF 6.1
Boya Ma,Wenshi Zhao,Yu Wu,Xiangyue Wan,Hang Zhao,Yongdan Wang,Jihui Lang,Jinying Li,Yang Liu
Tetracycline (TC), a widely used broad-spectrum antibiotic for treating bacterial infections, poses significant risks to human health and ecological environments caused by extensive abuse. Hence, sensitive detection and efficient degradation of TC are crucial for protecting both human health and ecological environment. In this work, a multifunctional Z-scheme Cu 2 O@Ag/g-C 3 N 4 heterojunction was designed and constructed in order to achieve both ultrasensitive surface-enhanced Raman scattering (SERS) detection and efficient photocatalytic degradation of TC. The influence of the Ag content on the SERS performance was investigated using the finite-difference time-domain (FDTD) method. The charge transfer (CT) mechanism was deduced by band gap and Fermi level calculations. The results showed that the synergistic effect of electromagnetic enhancement (EM) and chemical enhancement (CE) contributed to the excellent SERS sensitivity of Cu 2 O@Ag/g-C 3 N 4 nanocomposites (NCs). The limit of detection (LOD) for TC using Cu 2 O@Ag/g-C 3 N 4 NCs as SERS substrate was as low as 10 −12 M, and the SERS substrate could also be used to TC detection in real milk samples. In addition, Cu 2 O@Ag/g-C 3 N 4 NCs could also act as the efficient photocatalyst to achieve the removal of TC with degradation rate of 94 % under visible light irradiation. Especially, the Cu 2 O@Ag/g-C 3 N 4 NCs maintained excellent photocatalytic performance even after six cycles. Possible degradation pathways and photocatalytic degradation mechanism of TC catalyzed by Cu 2 O@Ag/g-C 3 N 4 NCs were also proposed. This multifunctional Z-scheme Cu 2 O@Ag/g-C 3 N 4 NCs should thus have great potential for the integration of ultrasensitive SERS detection and efficient degradation of antibiotics.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Yingshuang Song,Yusi Peng,Nguyen Viet Long,Zhengren Huang,Yong Yang
At present, there is an urgent need to develop a highly efficient adsorbent and photocatalyst with photodegradability under visible light for the removal of dye molecules in wastewater. Herein, the multifunctional three-dimensional Ag/g-C 3 N 4 /reduced graphene oxide aerogel (Ag/g-C 3 N 4 /RGOA) has been successfully prepared by a simple “one-pot” hydrothermal method , which exhibits three kinds of improved properties including excellent surfaced-enhanced Raman scattering (SERS) activity, highly efficient adsorption and photocatalytic activity. The composite aerogel presents 3D porous network structure. Importantly, the composite aerogel exhibits excellent adsorption and photocatalytic performance with adsorption rate of 44% and degradation rate of 93%. This is mainly attributed to the synergistic effect of Ag NPs, g-C 3 N 4 and RGO, which promotes the separation of photogenerated electrons and holes. In addition, the 3D porous network structure is conducive to the utilization of visible light and the transfer of photogenerated electrons. Furthermore, Ag/g-C 3 N 4 /RGOA exhibits excellent SERS activity with a detection limit of 1 × 10 −7 M for R6G molecules. The SERS performance has been utilized to monitor the process of adsorption and photodegradation of R6G by the composite aerogel. In this research, the designed multifunctional aerogel may become an attractive material for the detection and removal of dyes in wastewater.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
·
2024
·Vol. 31
·期 1
·1-13
·
IF 3
Wu Jinze,Yao Jiale,Zhu Xiping,Zuo Danying,Zhang Hongwei,Jiang Shuai,Li Hongjun
Most hydrogels for dye treatment only have the adsorption ability for anionic or cationic dyes, while a few zwitterionic hydrogels that can adsorb both anionic and cationic dyes need a complicated regeneration process when they are reused. To prepare reusable zwitterionic adsorbent hydrogels, in this paper, a zwitterionic composite hydrogel with Ag@g-C 3 N 4 was prepared, which not only can adsorb both anionic and cationic dyes but also has photocatalytic degradation ability. The scanning electron microscopy images show that the optimum hydrogel has a large number of micro pores for dye adsorption. The adsorption capacity of the hydrogel achieves the highest in mixed dye concentration of 50 mg·L -1 with pH value of 7–9. Benefiting from the synergistic effect of adsorption and photocatalytic degradation, the removal efficiency of methyl orange and methylene blue in mixed dyes was up to 93.86% and 91.80%, respectively. The photocatalytic activity trapping experiments showed that superoxide radicals as well as hydroxyl radicals played a major role in photocatalytic degradation. After 5 consecutive photocatalytic degradations, the removal ratio of the hydrogel for dyes was still above 80%, indicating good photocatalytic degradation and reusability properties. This research suggested the zwitterionic composite hydrogel has a promising prospect in removing dyes from wastewater treatment.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 38
·31508-31521
·
IF 4.6
Donghai Li,Yunrui Xu,Shilin Zhang,Linping Wang
To improve the utilization of solar energy and the efficiency of photocatalytic organic pollutant degradation, novel Z-scheme heterojunctions with high visible light catalytic performances have been widely developed. Herein, a novel Z-scheme BiFeO3/Ag/g-C3N4 heterojunction with a hierarchical 1D/0D/2D structure and visible light absorption was constructed by matching the suitable band structure between 1D BiFeO3 and 2D g-C3N4 and employing the localized surface plasmon resonance (LSPR) effect of 0D Ag nanoparticles. BiFeO3 nanofibers were synthesized via the electrospinning technique, providing short electron transport paths and visible light absorption range for g-C3N4. Plasmonic Ag nanoparticles were photodeposited on the surface of BiFeO3 to enhance the separation efficiency of the photogenerated electron–hole pairs between the bulk interfaces. UV-vis DRS, PL, photocurrent and EIS spectra confirmed the important roles of Ag and BiFeO3 in improving the photocatalytic activity of the Z-scheme heterojunction. The working principle of the BiFeO3/Ag/g-C3N4 Z-scheme heterojunction was proposed, indicating that ˙O2− and ˙OH are the main active species for the photocatalytic degradation of methylene blue (MB). The prepared BiFeO3/Ag/g-C3N4 heterojunction exhibited the highest photocatalytic activity, where its rate constant was 5.84 times higher than that of the pristine BiFeO3 and 3.26 times higher than that of the pristine g-C3N4. This study offers a new means for the design of novel high-performance photocatalysts, which can be a promising candidate in industrial applications.
研究领域:
光催化
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材料科学
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环境科学
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纳米技术
·
物理化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Linlin Sun,Xiaoshuo Liu,Xiaohan Jiang,Yibing Feng,Weijie Yang,Nan Jiang,Jigang Wang
Many optimization strategies have been applied to the construction of materials with excellent organic contaminants removal activity, whereas the interaction mechanisms of these strategies have rarely been revealed. Here, based on the analysis and evaluation of CeO 2 -decorated hierarchical tremella-like Ag/g-C 3 N 4 (Ce@15-AC) materials, the mechanism of oxidation activity enhancement is studied in depth. Finite–difference time–domain (FDTD) simulations and density functional theory (DFT) calculations reveal the mechanism of local surface plasma resonance (LSPR) effects and interfacial electric fields. The synergistic effect of the Z-scheme electrons transfer direction and Ce 4+ /Ce 3+ redox couple conversion enable Ce@15-AC to achieve the maximum redox capacity. The hierarchical structure can generate scattering and reflection of sunlight and provide a variety of channels for light transmission. Moreover, experiments and characterizations prove that Ce@15-AC material has fantastic photoelectrochemical, physical and optical properties. The removal efficiency of tetracycline (TC) by Ce@15-AC reaches 91.7% within 40 min (20 mg/L, 100 mL), and TC is almost completely degraded after 60 min. The apparent reaction rate constant (k) of Ce@15-AC is approximately 0.05974 min −1 , which is 10.71 times higher than 3DT-CN (0.00558 min −1 ). This work provides a meritorious instance in the advanced oxidation of organic contaminants application field.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
MOLECULES
·
2020
·Vol. 25
·期 19
·4432
·
IF 3.267
Quan Pan,Yuelin Kong,Kuan Chen,Mi Mao,Xiaohui Wan,Xiaoyan She,Qingsong Gao,Yu He,Gongwu Song
In this work, we report the synthesis of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets decorated on zeolitic imidazolate framework-8 (ZIF-8) to form a Cu-Ag/g-C3N4/ZIF hybrid. The hybrid was synthesized and characterized by Transmission electron microscopy (TEM), Fourier transformed infrared (FTIR), the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Cu-Ag/g-C3N4/ZIF hybrid has intrinsic peroxidaselike catalytic activity towards the oxidation of TMB in the presence of H2O2. The situ synthesis of Cu-Ag bimetallic nanopartiles on 2D support such as g-C3N4nanosheets would significantly enhance the peroxidaselike catalytic properties of individual Cu-Ag bimetallic nanopartiles and the g-C3N4nanosheets. After loading of Cu-Ag bimetallic nanopartiles and g-C3N4nanosheets on the ZIF-8, the hybrids exhibited superior peroxidaselike catalytic activity and good recyclability. Then, this method was applied for detecting glucose in human serum, owing the significant potential for detection of metabolites with H2O2-generation reactions.Keywords:Cu-Ag/g-C3N4/ZIF hybrid;nanozyme;colorimetric detection;H2O2;glucose
研究领域:
生物化学
·
纳米医学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Guotong Chen,Fang Mi,Shan Zhang,Xuehui Rao,Jian Sun,Zhong Yang,Ming Guan
This study reports the design and fabrication of a magnetic nanoporous carbon-based recyclable surface-enhanced Raman scattering (SERS) substrate Co/C@Ag/g-C 3 N 4 , which can simultaneously achieve SERS detection and visible-light photocatalytic degradation of malachite green (MG). Co/C and g-C 3 N 4 can spontaneously adsorb and concentrate MG near plasmonic nanoparticles, thereby enhancing the SERS response. The substrate exhibited a SERS enhancement factor of approximately 1.3 × 10 6 . The limit of detection (LOD) for MG in aquaculture water, prawn, and tilapia was 8.2 × 10 −11 M, 0.08 μg/kg, and 0.06 μg/kg, respectively. The substrate can be magnetically collected from the complex matrix and regenerated through photocatalytic degradation. Eliminates the co-centrifugation of the SERS substrate with the complex matrix. Even after 4 regeneration cycles, the substrate retained nearly 80 % of its original SERS intensity. This study presents a novel strategy for constructing self-enriched, self-cleaning, and recyclable substrates with promising applications in food safety and environmental protection.
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高影响因子
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