MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 1
·1-11
·
IF 5.833
Lv Yuanxia,Qin Xiaohuan,Hu Kun,Huang Yong,Zhao Shulin
A novel matrix-assisted laser desorption/ionization time-of-flight mass spectrometric method (MALDI-TOF MS) for determination of highly sensitive small molecular compounds was developed based on molybdenum disulfide nanosheets hybridized with ultrathin graphitic carbon nitride (MoS 2 /g-C 3 N 4 ) as the matrix. With this approach, the synergistic effects of MoS 2 and g-C 3 N 4 enhance the UV absorption of MoS 2 /g-C 3 N 4 , increase both desorption and ionization efficiency in LDI MS, and induce higher signal-to-noise ratio of analytes when compared with the bare MoS 2 and g-C 3 N 4 matrix in the determination of amino acids, antibiotics, neutral oligosaccharides, uric acid, and polyethylene glycols (PEGs). The detection limits of these small molecular compounds are in the ranges 0.1 to 10 μg mL −1 , 1*10 −3 to 1.0 μg mL −1 , 1.0 to 10 μg mL −1 , and 2*10 −4 μg mL −1 , respectively, and the polydispersity index of these PEGs is less than 1.02. Moreover, high salt tolera`nce and homogeneous deposition on the spot results in good reproducibility. The relative standard deviations (RSDs) of shot-to-shot and spot-to-spot ( n = 15) of these compounds are less than 10.1% and 12.5%, respectively. With MoS 2 /g-C 3 N 4 , the uric acid in complicated biological samples can be directly determined in combination with LDI-TOF MS. Graphical abstract
We synthesized MoS 2 /g-C 3 N 4 nanohybrid as an efficient matrix for MALDI-TOF MS analysis of small molecules as well as quantitative detection of uric acid in human urine.
研究领域:
分析化学
·
生物医学
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DOI
高影响因子
Catalysts
·
2020
·Vol. 10
·期 4
·373
·
IF 3.52
Junjiao Zhang,Zhengru Zhu,Junchao Jiang,Hong Li
AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were synthesized by a simple ultrasound-assisted hydrothermal approach. We characterized the microstructure, surface morphology, and optical absorption capacity of the obtained samples. According to the characterization results, AgI/MFeO3/g-C3N4(M = Y, Gd, La) nano sheet–sphere–sheet photocatalysts were successfully obtained. MFeO3nanospheres and AgI nanosheets were dispersed evenly on the surface of g-C3N4nanosheets. AgI/MFeO3/g-C3N4showed remarkable photocatalytic. Especially, 95% of NOF was photodegradated over AgI/LaFeO3/g-C3N4within 3 h and the higher photocatalytic performance still remained after six cycles. Additionally, The N2adsorption–desorption isotherms of AgI/MFeO3/g-C3N4showed that AgI/LaFeO3/g-C3N4possessed the highest specific surface area (79.32 m2/g). The result of scavenging experiment revealed that ·O2−, h+, and ·OH were the main roles in the photodegradation process. Benefitting from the nice energy band matching, MFeO3acted as the center of photogenerated electrons migration and separation provided more direct electron channels. This work proposes an effective approach for the design and configuration of dual Z-scheme photocatalysts to accomplish the removal of organic contaminants based on g-C3N4.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Yingying Qin,Jian Lu,Fanying Meng,Xinyu Lin,Yonghai Feng,Yongsheng Yan,Minjia Meng
Effectively separating photo-generated charge carriers is usually important but difficult for the high-activity photocatalysis. Fabricating 2D/2D Schottky-Ohmic junction is more beneficial to the spatial separation and transfer of photo-induced charges at the interface of different components due to the matching of distinct two-dimension structure and band alignment, but the manipulation and mastery of junction type (Schottky-Ohmic junction and Z-scheme junction) and electronic structure is an arduous task for preparing satisfactory photocatalysts and investigating the PHE mechanism. In this work, the 2D/2D WO 3 /Pt/ g -C 3 N 4 (WPC) Schottky-Ohmic junction composite photocatalysts is formed via facile hydrothermal and photo-induced deposition method for employing to produce H 2 . The optimized WPC Schottky-Ohmic junction photocatalyst exhibits remarkable photocatalytic H 2 -release performance with ability to produce the amount of H 2 reaches 1299.4 μmol upon exposure to visible light, which is about 1.2 and 11.5 times higher than that of WO 3 / g -C 3 N 4 /Pt (WCP) (1119.4 μmol) and pure CN (113.2 μmol)), respectively. This remarkable enhancement of photocatalytic performance is ascribed to: (i) Schottky-Ohmic junction can strikingly expedite spatial charge separation and elongate electron lifetime, (ii) the 2D/2D structure can shorten the charge transportation distance, (iii) Pt with rich electron density can stably adsorb H + . This work provides a successful paradigm for future fundamental research, and exquisitely designs ideal g -C 3 N 4 -based photocatalysts by simultaneously adjusting and optimizing material structure and electronic dynamics.
研究领域:
材料科学
·
光催化化学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 193
·期 1
·49
·
IF 5.3
Wang Chuang,Peng Yue,Miao Yuanyuan,Sun Xinyuan,Cheng Wenting,Li Jinlong
DNA methyltransferases (MTases) play a critical role in epigenetic regulation and are closely associated with the occurrence and development of various diseases. To address the limitations of current detection methods, which often suffer from complicated operation and limited sensitivity we have developed a label-free fluorescent biosensing platform based on DNA-templated silver nanoclusters (DNA-AgNCs) for the detection of DNA adenine methyltransferase (Dam MTase) activity and the screening of its inhibitors. In this system, DNA-AgNCs signal probes are synthesized via a simple reduction reaction. Dumbbell-shaped DNA substrates are designed to be specifically methylated by Dam MTase in the presence of S-adenosylmethionine (SAM). The methylated substrates are subsequently recognized and cleaved by DpnI, yielding DNA fragments with 3′-OH termini. These termini are extended by terminal deoxynucleotidyl transferase (TdT) in the presence of dGTP, generating G-rich sequences, which hybridize with the DNA-AgNCs and significantly enhance the fluorescence intensity. This cascade reaction enables the sensitive detection of Dam MTase activity. Compared with the other approaches, the proposed method exhibits a wider linear range (0.5–10 U/mL) and a lower detection limit (0.165 U/mL). Furthermore, inhibition studies demonstrate that 5-fluorouracil and gentamicin effectively suppress Dam MTase activity. The method also shows excellent performance in complex biological samples. Overall, this fluorescence-based strategy offers high sensitivity and excellent specificity, demonstrating broad application prospects in epigenetic research and drug discovery. Graphical
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Lianying Lu,Guohong Wang,Min Zou,Juan Wang,Jun Li
Hierarchical TiO 2 /g-C 3 N 4 heterojunction photocatalysts with well-defined multiscale porous TiO 2 framework are synthesized by simply calcinating tetrabutyl titanate and melamine precursors. The samples have been characterized by XRD, XPS, SEM, TEM, FTIR, nitrogen absorption-desorption equipment and TGA. The photocatalytic activity of these samples has been investigated in photo-degradation of Rhodamine B (RhB). The results show that calcining temperature critically affects the microstructure, surface area, interface structure and catalytic properties of the prepared samples. At the optimal calcining temperature of 550 °C, the apparent reaction rate constant of the catalyst is 55.0 × 10 −3 min −1 , which is 16.2 fold of pure TiO 2 (3.4 × 10 −3 min −1 ) and 3.4 fold of pure g-C 3 N 4 (16.4 × 10 −3 min −1 ), respectively. The strengthened visible-light-driven photocatalytic activity is attributed to the formation of a unique Z-scheme TiO 2 /g-C 3 N 4 heterojunction due to C- or N-doping at the surface of the porous TiO 2 framework. This mechanism explains the observation in a series of radical trapping experiments that superoxide ions and photo-generated holes play major roles in the photo-decolorizing process while hydroxyl radicals are also involved with a minor role.
研究领域:
材料科学
·
化学工程
·
环境科学
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DOI
高影响因子
iScience
·
2025
·
IF 4.1
Zhiwei Meng,Zirui Peng,Yupeng Yan,Qin Zhang,Yang Li
Photocatalytic technology is currently one of the most effective methods for removing tetracycline (TC) from the environment; however, the underlying photocatalytic mechanism remains unclear. In this study, zinc oxide quantum dots (ZnO-QDs)/hollow-sphere g-C 3 N 4 (CNHS) S-scheme heterojunction photocatalysts were synthesized for the photocatalytic degradation of tetracycline. Experimental results showed that the 7% ZnO-QDs/CNHS photocatalyst exhibited excellent TC degradation efficiency, with a removal rate of 80.2% within 15 min. Through free radical conversion pathway analysis, singlet oxygen ( 1 O 2 ) was identified as the primary active species responsible for tetracycline degradation. Further calculations indicated that the combination of holes (h + ) and superoxide radicals (O 2 − ) produces 1 O 2 , accounting for 83.28% of the total contribution. These findings provide theoretical support for 1 O 2 as the primary active species in pollutant degradation.
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Shifu Chen,Yingfei Hu,Xiaoliang Jiang,Sugang Meng,Xianliang Fu
Developing a high-efficiency visible light photocatalyst is always a research hotspot in photocatalytic field. In this study, a novel Z-scheme photocatalyst WO 3 /g-C 3 N 4 with high efficient visible light photocatalytic activity was prepared via ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron spin resonance (ESR), and photoluminescence (PL). The photocatalytic activity was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The results showed that composite WO 3 /g-C 3 N 4 exhibits a much higher photocatalytic activity than a single g-C 3 N 4 . The rate constants of photocatalytic degradation of MB and BF for WO 3 (5.0 wt.%)/g-C 3 N 4 are 4.77 times and 3.84 times that of pure g-C 3 N 4 . The characterization results by physical and chemical methods demonstrated that composite WO 3 /g-C 3 N 4 is a typical Z-scheme photocatalyst. The enhancement of the photocatalytic activity may be attributed to the formation of the Z-scheme system between g-C 3 N 4 and WO 3 , which could result in the photoexcited electrons of g-C 3 N 4 and photoexcited holes of WO 3 participating in oxidation and reduction reactions, respectively.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
Nanoscale Advances
·
2020
·Vol. 2
·期 11
·5396-5402
·
IF 0
Zhou Liu,Shuzhen Wu,Xiaojie Yang,Yijun Zhou,Jiaren Jin,Junmei Sun,Li Zhao,Shimin Wang
Carrier recombination and charge loss at the interfaces of perovskite layers have a significant influence on high-performance planar perovskite solar cells (PSCs). We employed two-dimensional graphitic carbon nitride (g-C3N4), which is a heat-resistant n-type semiconductor, to modify the electron-transport layer/perovskite and perovskite/hole-transport layer interfaces, respectively. g-C3N4 could passivate the surface trap states of the methylammonium lead iodide light absorber through the formation of a Lewis adduct between N and the under-coordinated Pb, and it could also remarkably reduce the grain boundaries between perovskite crystal particles. A maximum power conversion efficiency (PCE) of 19.67% (Voc = 1.14 V, Jsc = 21.45 mA cm−2, FF = 0.807) could be obtained from planar PSCs with long-term stability using dual-positioned g-C3N4. Therefore, we consider that ultrathin semiconductor films with a Lewis base nature are suitable as dual-functional transport materials for devices. This work provides new guidance for dual-interfacial modification to improve the PCE and stability of devices.
研究领域:
材料科学
·
新能源
·
半导体器件
·
界面工程
·
光电子学
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DOI
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Huinan Che,Guangbo Che,Pengjie Zhou,Chunbo Liu,Hongjun Dong
It is very challenging to fabricate novel, high-efficiency photocatalysts with an enhanced visible light absorption capacity, high charge carrier separation efficiency, and large specific surface area . For this purpose, a yeast-derived carbon (YC) sphere was added as a charge carrier bridge to the 2D-2D Cu 2 WS 4 /g-C 3 N 4 heterojunction through a facile hydrothermal method . The YC sphere, as a bridge for electrons, is not only advantageous in inhibiting rapid recombination by electrons, but also remarkably enhances the visible light absorption capacity. Moreover, the YC sphere can also increase the specific surface area and surface roughness , which can enhance the adsorption of pollutant molecules and provide abundant active sites for photocatalytic reactions. The g-C 3 N 4 /YC/Cu 2 WS 4 heterojunction showed the best photocatalytic activity for reducing hexavalent chromium Cr(VI) and decomposing tetracycline (TC) under visible light. Meanwhile, the acute toxicity of Daphnia magna (D. magna) gradually decreases with the conversion of Cr(VI) to Cr(III) in solution. In addition, the possible intermediate products and the photocatalytic reaction mechanism are revealed in depth. This work provides a general example for improving the photocatalytic activity of 2D-2D based heterojunctions by introducing a biomass material.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2014
·
IF 2.291
Li-Na Wen,Meng-Xia Xie
s G-quadruplex DNA is an effective target for anticancer drug, and investigation of the G-quadruplex DNA with natural compounds plays a key role in the development of anticancer drugs. In this article, room temperature phosphorescence sensing system based on l -cysteine-capped Mn-doped ZnS QDs has been established. Sanguinarine can adsorb on the surface of Mn-doped QDs and quenched the phosphorescence emission of the sensor. When the G-quadruplex sequences combined with the sanguinarine of the QDs-sanguinarine system, the phosphorescence intensities of the QDs sensors would be restored, and the binding abilities of the G-quadruplex DNA with the sanguinarine can be evaluated by the phosphorescence recoveries of the sensor system. Based on the developed approach, the interaction of sanguinarine and six G-quadruplex DNA with various sequences (tel24-1, tel24-2, tel22, k-ras, HIF-1α and c-kit1) has been investigated. The results showed that the binding abilities of the G-quadruplex DNA with sanguinarine were related to their number of bases and conformations. The conformational changes of the six G-quadruplex DNA, after binding with sanguinarine, have also been probed by circular dichroism. Combining the changes of the phosphorescence lifetime, the binding mechanism of the G-quadruplex DNA and sanguinarine has been discussed. The developed method was simple, rapid and specific, and can avoid fluorescence interferences of the system, and it would be prospective to evaluate the interaction of the drug with different G-quadruplexes.
研究领域:
生物化学
·
分析化学
·
分子生物学
·
癌症研究
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 12
·7469-7479
·
IF 1.134
Ji Dongliang,Zhang Meixing,Geng Xinxiang,Zha Zhenxing,Li Ying,Yang Jing,Cui Shihai
The graphitic carbon nitride (g-C3N4) and the Fe3O4/g-C3N4 magnetic materials were synthesized in this paper. The structures of the materials were confirmed by a series of analysis. The Fe3O4/g-C3N4
was then used as a sorbent to adsorb polychlorinated diphenyl ethers and polychlorinated biphenyls. Different extraction conditions were examined, including adsorbent amount, salinity, pH of the sample matrix, adsorption time, reaction temperature, elution solvent and preconcentration factor.
The maximum recoveries were obtained by employing methanol to desorb pollutants on 40.0 mg Fe3O4/g-C3N4 in 120.0 mL environmental water with a salinity of 5% (w/v) at a pH of 7 at 25 °C within 10 min. Using the optimized parameters, the detection
limits of the method are between 0.01 and 0.04 μ · L−1 with a satisfying linear relationship. The adsorbent can be recycled at least 10 times with no significant reduction in the extraction efficiency.
研究领域:
分析化学
·
环境科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 8
·1-8
·
IF 6.232
Long Yuanli,Liu Shuang,Cai Yunfei,Zhang Jiale,Zhang Xinfeng,Tang Yurong
Graphitic carbon nitride (g-C 3 N 4 ) as an outstanding photoresponsive nanomaterial has been widely used in biosensing. Other than the conventional single channel sensing mode, a triple-channel sensing array was developed for high discrimination of proteins based on the photoresponsive g-C 3 N 4 . Besides the photoluminescence and Rayleigh light scattering features of g-C 3 N 4 , we exploit the new photosensitive colorimetry of g-C 3 N 4 as the third channel optical input. The triple-channel optical behavior of g-C 3 N 4 can be synchronously changed after interaction with the protein, resulting in the distinct response patterns related to each specific protein. Such a triple-channel sensing array is demonstrated for highly discriminative and precise identification of nine proteins (hemoglobin, trypsin, lysozyme, cytochrome c, horseradish peroxidase, transferrin, human serum albumin, pepsin, and myoglobin) at 1 μM concentration levels with 100% accuracy. It also can discriminate proteins being present at different concentration and protein mixtures with different content ratios. The practicability of this sensor array is validated by high accuracy identification of nine proteins in human urine samples. This indicates that the array has a great potential in terms of analyzing biological fluids.
.
研究领域:
生物传感器
·
分析化学
·
材料科学
·
生物技术
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）