JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Ning Zhang,Chuanhui Huang,Ping Tong,Zunmei Feng,Xiaoping Wu,Lan Zhang
Volatile polycyclic aromatic hydrocarbons (PAHs) in water and soil are associated with status in the human body. Development of simple, efficient detection method is challenging due to the coating could be attacked by the abundance of water in the direct-immersion solid-phase microextraction. The stability of coating is essential to the analysis results. In this paper, a stable Ni-Zn MOF/g-C 3 N 4 (MG NFs) nanoflowers with cavity traps structure was firstly reported and acted as solid-phase microextraction (SPME) adsorbent for PAHs. Markedly enhanced moisture and acid stability of the MG NFs was obtained through the doping the hydrophobic graphitic carbon nitride (g-C 3 N 4 ) and metal ions into metal organic frameworks (MOFs). The aperture environment and ambient environment of MG NFs were changed by the doping of the Ni and the g-C 3 N 4, respectively. The moisture and acid stability of MG NFs were prominently increased under the dual protection. Compared to commonly used commercial coatings, the MG NFs own large surface area, unique nanoflowers structure and numerous open metal sites on the nanosheets, which demonstrated significant extraction superiority for PAHs. The MG NFs coated fiber was used for the SPME preconcentration of PAHs and couped with GC–MS for detecting PAHs. It presented low detection limits (0.1–3.0 ng L −1 ), wide linearity (0.3–5000.0 ng L −1 ) and good linearity (the correlation coefficient >0.9951). The inter-day and intra-day relative standard deviation (RSD) (n = 3) for three replicate extractions using one fiber was 3.8%–9.1%, and 3.5%–9.2%, respectively. The fiber-to-fiber reproducibility (n = 3) was 4.2–11.8%. The coupling method was successfully applied in the analysis of real water and soil samples with satisfactory recoveries of 82.9–109.2%, 84.2–106.4%, and the corresponding RSDs were 2.4–11.3%, 3.6–10.8%, respectively. The results indicated the effectiveness of NG NFs coated fiber in further practical application.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
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2020
·Vol. 20
·期 9
·5539-5545
·
IF 1.134
Yin Hao Yong,Zheng Yi Fan,Wang Ling
A convenient and simple phenol electrochemical sensor was constructed based on the Au/CeO2/ g-C3N4 nanocomposites, which were obtained by loading the gold–cerium oxide (Au/CeO2) nanoparticle on graphite-like carbon nitride (g-C3N4)
through precipitation–reduction methods. The microstructure and morphology of Au/CeO2/g-C3N4 nanocomposite were verified using different techniques such as XRD, TEM, and HRTEM. Voltammetry and amperometry methods were used to study the electrochemical
performance of the constructed phenol electrochemical sensors. The results demonstrated evidently that the combination of Au/CeO2 and g-C3N4 may improve sensing performances of phenol determination. The detection linear range of the sensor was 10–90 μM
under the optimum parameters. The Au/CeO2/g-C3N4 based electrochemical sensor also has low detection limits (2.33 μM) and high sensitivities (0.1080 mA/μM) for phenol detection. In addition, the sensor also had considerably favorable anti-interference
performance. As a consequence, the sensor demonstrated that the electrochemical system provided a promising effective strategy for detection of phenol.
研究领域:
分析化学
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环境科学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Yanxian Geng,Dongyun Chen,Najun Li,Qingfeng Xu,Hua Li,Jinghui He,Jianmei Lu
Heterojunctions have attracted considerable attention for efficiently utilizing solar energy and improving conversion efficiency during pollutant degradation. Herein, carbon nitride and hematite (α-Fe 2 O 3 ) are used to prepare a Z-scheme 2D/2D α-Fe 2 O 3 /g-C 3 N 4 heterojunction using an impregnation-hydrothermal method. The unique 2D/2D structure has a high interfacial area and widely-dispersed active sites. The energy band structure of the Z-scheme heterojunction leads to broad visible-light absorption and promotes charge transfer. Optimizing the content of the α-Fe 2 O 3 precursor in composite leads to a maximum efficiency of 60.8% for the removal of 600 ppb of NO , which is approximately 1.78 times that of g-C 3 N 4 (34.2%). The photocatalytic performance is greatly promoted because of the formation of the heterojunction and the strong interfacial action between g-C 3 N 4 nanosheets and α-Fe 2 O 3 nanoplates. Cycling experiments verify that the α-Fe 2 O 3 /g-C 3 N 4 heterojunction has good stability and reusability. The α-Fe 2 O 3 /g-C 3 N 4 heterojunction therefore has great potential in sustainable and efficient pollutant degradation.
研究领域:
环境催化
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材料科学
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物理化学
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纳米科技
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光化学
✓ 已验证
DOI
高影响因子
KINETICS AND CATALYSIS
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2025
·
IF 1.4
Jiang Xin,Zeng Zhenxing
Interfacing two semiconductors for heterojuctions construction has been considered as an effective way to facilitate electron-hole separation, thus improving the photocatalytic activity. In this paper, PCN-224/g-C 3 N 4 heterojunction was constructed by PCN-224 and g-C 3 N 4 using a solvothermal method. Transmission electron microscopy (TEM) images reveal a well-matched, smooth interface between PCN-224 and g-C 3 N 4 , demonstrating the successful formation of a tight junction. Photoelectric performance tests confirm that the heterojunction significantly enhances the light absorption capability within the visible range and improves the efficiency of electron-hole separation. Herein, the PCN-224/g-C 3 N 4 heterojunction exhibited excellent photocatalytic activity in both disinfection and organic pollutant degradation. Under visible light irradiation (λ > 420 nm) for 3 h, it completely degraded phenol and effectively inactivated E. coli . In the photocatalytic process, electrons migrate from the conduction band of g-C 3 N 4 to PCN-224, while holes transfer from the valence band of PCN-224 to the valence band of g-C 3 N 4 , thereby generating \({\text{O}}_{2}^{{\bullet - }}\) and h + radicals. These generated radicals effectively oxidize and degrade phenol.
研究领域:
材料科学
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环境科学
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化学工程
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纳米技术
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2020
·
IF 7.632
Yong-Ting Li,Xiao-Li Zhang,Zhi-Kun Peng,Pu Liu,Xiu-Cheng Zheng
It is a crucial and urgent task to develop high performance catalysts for the hydrolysis of ammonia borane (NH3BH3, AB), which is presently thought to be an effective strategy for hydrogen generation. In this work, we immobilize the ultrafine RuNi alloy nanoparticles in the network of hierarchical porous g-C3N4 thin sheets with a facile adsorption–in situ reduction method. The structural and physicochemical properties of the as-prepared catalysts are studied using various techniques. The influence of different molar ratios of Ru to Ni in the catalysts on the hydrolytic dehydrogenation rate of AB is investigated to optimize the best one. The detailed reaction kinetics and the enhancing effect of NaOH with different dosages on the hydrolysis rate are studied through a series of experiments. Catalyzed by the optimal catalysts (denoted as Ru0.5Ni0.5/p-g-C3N4), the hydrolysis reaction is first-order and near zero-order relative to the Ru and AB concentrations, respectively. The corresponding turnover frequency reaches 840.3 min–1, and the apparent activation energy is as low as 14.1 kJ mol–1, which are greatly superior to many similar or counterpart catalysts previously reported. The results indicate the potential of the bimetallic alloy catalysts for the hydrolytic dehydrogenation of hydrogen storage materials.
研究领域:
材料科学
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能源化学
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催化反应
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
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2024
·
IF 1
Fang-yan Chen,Min-keng He,Yu-bin Tang,Cheng-yi He,Ke-ke Shu,Ming-yang Li
A core-shell g-C 3 N 4 /SiO 2 nanocomposite was successfully synthesized by depositing g-C 3 N 4 , obtained from the sublimation of melamine and subsequent polymerization reaction in the gaseous phase, on the nano-silica. The as-prepared g-C 3 N 4 /SiO 2 was characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, N 2 adsorption–desorption, UV-vis diffuse reflectance spectroscopy. The visible-driven photocatalytic activity of g-C 3 N 4 / SiO 2 was evaluated by the degradation of tetracycline. The results indicate that the specific surface area of g-C 3 N 4 /SiO 2 is 97.32 m 2 /g, which is 6.74 times as high as that of bulk g-C 3 N 4 (14.44 m 2 /g). Compared to bulk g-C 3 N 4 , g-C 3 N 4 /SiO 2 composite exhibits significantly enhanced photocatalytic activity for degradation of tetracycline and can degrade 72.7% of tetracycline within 60 min under visible-light irradiation. The photodegradation rate constant of tetracycline over g-C 3 N 4 /SiO 2 is 7.2 times as high as that over bulk g-C 3 N 4 . The greatly enhanced photocatalytic activity of g-C 3 N 4 /SiO 2 is due to coupling enlarged surface areas with the contribution of SiO 2 in inhibition of the recombination of photo-induced electron-hole pair.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Jun Zhang,Wei Zuo,Lingchao Kong,Hao Cui
In this study, a newly-designed Z-scheme g-C 3 N 4 @ZnO heterostructure was synthesized by 3D ZnO controllable deposition on 2D g-C 3 N 4 nanosheets using thermal atomic layer deposition. The activity of 2D/3D g-C 3 N 4 @ZnO was evaluated by photocatalytic degradation of cephalexin under simulated sunlight. Results showed that the g-C 3 N 4 @ZnO photocatalyst achieved 98.9% degradation and 72.8% mineralization of cephalexin within 60 min of illumination. This degradation process fitted to the pseudo first order dynamic model with reaction rate constant of 0.0735 min −1 , 5.4 and 8.1 times higher than that of pure g-C 3 N 4 and ZnO, respectively. Consecutive degradation experiments revealed the excellent stability and recyclability of 2D/3D g-C 3 N 4 @ZnO photocatalyst. Mechanism exploration found the enhanced photocatalytic activity was mainly ascribed to the strong oxidizability of active species generated on Z-scheme g-C 3 N 4 @ZnO. Besides, the oxidative species, especially h + and · OH played significant roles in the degradation process. Moreover, the degradation intermediates were identified through HPLC/MS/MS analysis and the possible pathway of cephalexin decomposition was proposed accordingly. The Z-scheme 2D/3D g-C 3 N 4 @ZnO was also proved effective for contaminants removal in real sewage. This study provided a new platform for controllable creation of Z-scheme photocatalysts with broad application prospects in contaminants remediation from aquatic environment under solar light.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
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2017
·Vol. 184
·期 9
·3325-3332
·
IF 4.58
Ji Danyang,Meng Hongmin,Ge Jia,Zhang Lin,Wang Hongqi,Bai Dongmei,Li Jianjun,Qu Lingbo,Li Zhaohui
The authors describe a silver(I) mediated fluorescent assay for glutathione (GSH). An allosteric oligonucleotide strand containing a G-rich sequence is used to produce a G-quadruplex, and N-methylmesoporphyrin IX (NMM) is chosen as the fluorescent probe. In the absence of Ag(I), the DNA strand is partially intramolecularly hybridized to form a hairpin structure wherein the G-rich sequence is partially caged. On addition of Ag(I), the hairpin is disrupted by forming C-Ag(I)-C base pairs. As a result, the G-rich sequence is released and folds into a G-quadruplex structure, which is able to bind NMM to generate strong fluorescence at 612 nm. However, in the presence of GSH, due to the strong binding ability between GSH and Ag(I), the C-Ag(I)-C structure is not formed. Hence, the DNA probe reverts back to its original structure and fluorescence is not increased. Based on these findings, a method was worked out that has a detection limit as low as 3.5 nM. Due to the inherent selectivity of the interaction between GSH and Ag(I), the method is highly selective over common potential interfering species. It was successfully applied to the fluorometric determination of GSH in cell extracts.
Schematic of a highly sensitive fluorometric glutathione (GSH) assay based on a conformational switch of a G-quadruplex mediated by silver(I) and N-methylmesoporphyrin IX (NMM) as a signal reporter.
研究领域:
分析化学
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生物化学
·
分子生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Lei Cui,Siliang Liu,Fangke Wang,Jingyao Li,Yanhua Song,Ye Sheng,Haifeng Zou
In this work, uniform g-C 3 N 4 shells have grown on the surface of electrospinning TiO 2 nanofibers to form one dimensional core/shell structured TiO 2 /g-C 3 N 4 nanofibers by a facial melamine-involved vapor deposition approach. During the heat treatment process in a simple setup, the TiO 2 nanofibers served as supports to prevent the collapses and aggregations of g-C 3 N 4 while forming heterojunctions with g-C 3 N 4 at the interface. The as prepared heterogeneous TiO 2 /g-C 3 N 4 photocatalyst exhibited remarkably enhanced visible light photocatalytic activity for RhB degradation by maxing heterojunctions at the core/shell interface. The photodegradation reaction rate constant of the obtained heterojunction is 0.064 min −1 , which is 4.0 times that of pure g-C 3 N 4 (0.016 min −1 ). To reach higher RhB degradation efficiency (>90%), TiO 2 /g-C 3 N 4 shortened the irradiation time by 60 min compared with individual components (pure g-C 3 N 4 or TiO 2 nanofibers). The remarkably high photocatalytic performances are mainly ascribed to the synergetic effect of efficient photogenerated charge separation properties and decreased electron transfer resistance of the heterojunctions formed between g-C 3 N 4 and TiO 2 . We believe the proposed simple method and setup is an attractive strategy for constructing one dimensional g–C 3 N 4 –based nano-heterojunctions with excellent photocatalytic properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2025
·
IF 3.5
Feng Lin,He Liu,Yu Tang,Xuejun Zheng,Hui Dong
Two-dimensional (2D) materials are widely used in heavy metal ion detection due to their high specific surface area and abundant active sites. Herein, we prepared highly selective and sensitive electrochemical sensors based on 2D graphitic-phase carbon nitride for the detection of Cu2+ and Pb2+ ions and investigated the effects of both tensile and compressive strains on the corresponding detection sensitivity, together with their mechanism. The prepared carbon nitride nanosheet sensors showed detection sensitivities of 3.63 and 0.41 μA·μM·cm–2, detection ranges of 0.2–100 and 6–100 μM, and detection limits of 0.0033 and 0.23 μM for Cu2+ and Pb2+, respectively. The induced compressive strain of −0.25% in the 2D CNNS significantly improved the sensitivity by 40.5% and 31.7%, while the tensile strain of +0.25% reduced the sensitivity by 41.9% and 43.9% in detecting Cu2+ and Pb2+ as compared to those at zero strain, respectively. Through DFT calculations, the corresponding compressive strain of −0.25% reduced the band gap from 1.21 eV under zero strain to 0.94 eV. On the contrary, the tensile strain of +0.25% increased the band gap from 1.21 to 1.45 eV, resulting from the contribution of orbitals of C-p and N-p. The declined and raised band gaps, respectively, result in increased and decreased electron transport rates, thereby improving and degrading the sensitivities of the sensors. Our research provides guidance on the design of flexible wearable sensors integrated into the construction of sensitive and reliable heavy ion detection systems.
研究领域:
材料科学
·
分析化学
·
电化学
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Yuqi Cui,Li-chao Nengzi,Jianfeng Gou,Yan Huang,Bo Li,Xiuwen Cheng
Z-scheme heterojunction photocatalyst can simultaneously reduce the recombination of photo-generated electron-hole pairs and preserve its outstanding redox ability during the process of photocatalytic reaction. In this study, Z-scheme MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 photocatalyst was successfully fabricated via an accessible method and comprehensive characterized by XRD, FT-IR, SEM, TEM, XPS, N 2 adsorption-desorption isotherms, UV–vis diffuse reflection spectroscopy and photoelectrochemical analysis. The as-obtained MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 composite exhibited superior photocatalytic activity for amino black 10B degradation than that of pure g-C 3 N 4 , α-Bi 2 O 3 , MIL-53(Fe) and α-Bi 2 O 3 /g-C 3 N 4 binary composite under visible light irradiation and the photodegradation rate would achieve the maximum when the mass fraction of MIL-53(Fe) was 32% in ternary composite. The enhanced photocatalytic performance of MIL-53(Fe)/α-Bi 2 O 3 /g-C 3 N 4 ternary composite could be mainly ascribed to improved visible light absorption range and the construction of an effective interfacial heterojunction driven by direct solid-state dual Z-scheme mechanism, which significantly facilitates the separation and transfer of photo-generated charge carriers. Eventually, the as-prepared ternary composite was confirmed to have prominent stability and reusability after consecutive 4 recycling run.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2022
·Vol. 22
·期 7
·2009-2021
·
IF 3.536
Liu Quanfeng,Yu Jiang,Jiang Yinying,Zhong Chengwei,Ding Senxu,Zhou Peng,Jin Yuanxiao
Purpose Soil organic matter pollution is a serious threat to the human living environment. The purpose of this paper is to investigate the effect of MIL-101(Fe)/g-C 3 N 4 catalyzed peroxynitrite degradation of 2-chlorophenol in soil and to analyze the reaction mechanism and further to explore the optimal parameters of this reaction system with utilizing the mathematical model. Methods MIL-101(Fe)/g-C 3 N 4 was successfully obtained by hydrothermal synthesis method by growing MIL-101(Fe) on the surface of g-C 3 N 4 to catalyze the degradation of 2-CP (2-chlorophenol) in soil by sodium persulfate. The influence factors on the removal rate of 2-CP were analyzed by the response surface methodology (RSM) and combined with theoretical calculations. RSM can be used to model continuous variable surfaces with less data and determine the optimal level range. Results MIL-101(Fe)/g-C 3 N 4 had a good catalytic performance due to its good catalytic properties and the adsorption of g-C 3 N 4 on 2-CP in the system and made the best removal rate of 2-CP increase to 91.2%. The correlation of model fitting results was significant, and the verification of its optimal parameters yielded results with an error of only 4.1%. Conclusion Further studies revealed that SO 4 •− and • OH were the reactive radicals, and SO 4 •− was the dominant, which impelled Fe 2+ and Fe 3+ to interconvert in the complex system. Possible degradation pathways were derived by analyzing the intermediates. Generally, this experiment provides some ideas for future research of MOFs in soil organic pollutant removal systems. Graphical abstract
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）