Frontiers of Chemical Science and Engineering
·
2023
·Vol. 18
·期 2
·1-13
·
IF 4.5
Li Yuxin,Guo Junxin,Han Rui,Wang Zhao
Heteroatom doping and defect engineering have been proposed as effective ways to modulate the energy band structure and improve the photocatalytic activity of g-C 3 N 4 . In this work, ultrathin defective g-C 3 N 4 was successfully prepared using cold plasma. Plasma exfoliation reduces the thickness of g-C 3 N 4 from 10 nm to 3 nm, while simultaneously introducing a large number of nitrogen defects and oxygen atoms into g-C 3 N 4 . The amount of doped O was regulated by varying the time and power of the plasma treatment. Due to N vacancies, O atoms formed strong bonds with C atoms, resulting in O doping in g-C 3 N 4 . The mechanism of plasma treatment involves oxygen etching and gas expansion. Photocatalytic experiments demonstrated that appropriate amount of O doping improved the photocatalytic degradation of rhodamine B compared with pure g-C 3 N 4 . The introduction of O optimized the energy band structure and photoelectric properties of g-C 3 N 4 . Active species trapping experiments revealed ·O 2 − as the main active species during the degradation.
研究领域:
材料科学
·
纳米技术
·
催化
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
·
2021
·
IF 1.219
Qing Wang,Yirong Li,Haoran Gao,Jianfeng Dai,Weixue li
MnCo 2 O 4 /g-C 3 N 4 composite material was synthesized by the hydrothermal method, compared with MnCo 2 O 4 without g-C 3 N 4 , it has excellent electrochemical performance. The composite material can reach a specific capacitance of 350 Fg − 1 at 1 Ag − 1 . The capacity retention rate is 96% after 1000 cycles at the rate of 2 Ag − 1 . Experiments show that g-C 3 N 4 can effectively disperse and improve the conductivity of urchin-like MnCo 2 O 4 , and the composite of sufficient g-C 3 N 4 can give full play to the performance of urchin-like MnCo 2 O 4 , provide faster electronic transport channels, effectively improve the ion migration rate, and make urchin-like MnCo 2 O 4 increase the rate performance under high charge and discharge rates.
研究领域:
材料科学
·
电化学
·
储能
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2020
·Vol. 36
·期 6
·1013-1016
·
IF 1.063
Yu Qiuying,Lin Xiu,Li Xinhao,Chen Jiesheng
Heterogeneous catalysts have been developed for C-C coupling reactions, but stand low activity and always proceed under harsh conditions. Photocatalytic Stille cross-coupling reaction as a green catalytic method for C-C bond formation is of great interest for a wide range of scientists but still lacks stable and highly efficient catalysts. Herein, we have designed an Au nanoparticle-graphitic carbon nitride heterojunction as an outstanding photo-catalyst for artificial photosynthesis in Stille cross-coupling reaction. The interface effect between metal and semiconductor makes electron rectify and prevents the recombination of electron-hole pairs. Moreover, the efficiency of Au nanoparticle catalysts could be adjusted by gold contents. Thus the turnover frequency(TOF) value reached the highest level of 788 h −1 over the optimal heterojunction catalyst. Most importantly, the C-C bond formation reaction has been proved to be carried out well under visible light irradiation, indicating the low-cost organic synthesis process. Further analysis confirmed the stability and general application of our heterogeneous Au nano-heterojunction catalyst.
研究领域:
化学
·
材料科学
·
催化
·
光化学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2026
·
IF 6
Wenbin Shi,Yi Tian,Ping Yang,Xiao Zhang
CsPbI 3 /Pt-g-C 3 N 4 Z-scheme heterojunction was created for efficient charge carrier separation. • 1D/2D heterostructure enhances interfacial contact and charge separation. • Pt nanocrystals act as electron mediators guiding directional charge flow. • Coupling photocatalysis with persulfate activation boosts degradation efficiency. • Singlet oxygen identified as the dominant reactive species in the system. A novel Z-scheme photocatalytic system was constructed by bridging graphitic carbon nitride (g-C 3 N 4 ) nanosheets with CsPbI 3 nanowires (NWs) via Pt nanocrystals (NCs) mediators. Comprehensive material characterization verifies that the rational combination of CsPbI 3 NWs and g-C 3 N 4 nanosheets leads to a well-defined 1D/2D heterostructure with intimate interfacial contact. Notably, Pt NCs as highly efficient electron mediators successfully establish a Z-scheme charge transfer pathway and thereby remarkably enhance the separation and migration efficiency of photogenerated carriers. Photoelectrochemical measurement confirms that g-C 3 N 4 /Pt/CsPbI 3 NW composites exhibit substantially elevated photocurrent density and remarkably reduced charge transfer resistance compared with the composites created using CsPbI 3 NCs, indicating the important role of 1D NW structure. Because of well-developed heterostructure and expanding visible light absorption, g-C 3 N 4 /Pt/CsPbI 3 NW composites revealed a degradation efficiency of 71.3% for 2,4-dichlorophenol while that of g-C 3 N 4 /Pt/CsPbI 3 NC composites is 62.9%. The degradation efficiency was further elevated to 82.8% with the introduction of persulfate, forming a coupled photocatalysis advanced oxidation process. Mechanistic studies demonstrate that the construction of Z-scheme heterojunction remarkably enhances the generation of superoxide radicals (·O 2 - ), with a resulting concentration of 12.23 × 10 –7 mol/L. These ·O 2 - species are subsequently converted into singlet oxygen, the primary active agent that works together with ·O 2 - and other radicals to synergistically degrade organic pollutants. These resultssuggest that a highly efficient and stable Z-scheme photocatalyst was created and offer important theoretical and practical guidance for advanced photocatalyst design. Download: Download high-res image (237KB) Download: Download full-size image
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Ming Liu,Hao Yang,Daixing Zhang,Yingjie Yu,Xiaoping Yang,Qing Cai
The occurrence of secondary caries associated with the polymerization shrinkage of dental resin composite repairing is mainly due to the resin lacking of bacteria-killing ability to counteract bacterial colonization at the tooth-resin interface. Photodynamic therapy against bacterial infections paves a new way for developing novel antibacterial dental resin composites. Herein, a yellowish graphitic carbon nitride (g-C 3 N 4 ) is synthesized via thermal polycondensation of melamine and functions as photoactive filler for resin composites in oral application. Upon exposed to visible light, the g-C 3 N 4 would generate reactive oxygen species (ROS) to kill bacteria, that Staphylococcus aureus ( S. aureus ) and Streptococcus mutans ( S. mutans ) almost completely die within 30 min. As the g-C 3 N 4 mixed into photocurable bisphenol A glycidyl methacrylate/triethylene glycol dimethacrylate (Bis-GMA/TEGDMA) at 5 wt%, the resulted composite remains high S. aureus and S. mutans killing rates (> 99 %), even supplemented with extra 65 wt% Schott® dental glass powders. The mechanical properties and biocompatibility of the resin composite are not influenced with the addition of g-C 3 N 4 . Overall, this resin composite with excellent photodynamic antibacterial capacity displays significant potential for dental restoration application.
✓ 已验证
产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Ting Ye,Heng Gao,Qingqing Zhang,Chenxiao Yan,Yali Yu,Yifan Fei,Longlong Gao,Xiaoshun Zhou,Yong Shao
Due to the high abundance of K + in environments and K + -induced high stability of G-quadruplex (G4), developing a selective G4-based fluorescent sensor for other metal ions with K + tolerance is a great challenge. Herein, we found that even in the presence of 15000-fold excess of K + , Ba 2+ exhibits a highly specific binding with a human telomeric G4 (htG4) in comparison with other G4-binding metal ions such as Pb 2+ and Sr 2+ . This specific binding event can be recognized by a natural fluorophore of hypericin with a lighting-up fluorescence response. Interestingly, inverting the polarity of the most 3' G in htG4 can sensitize the Ba 2+ response with the retaining Ba 2+ specificity and K + tolerance. This polarity inversion of htG4 causes a G4 conformation change in K + and the polarity-inverted htG4 tends to favorably dimerize in response to the Ba 2+ specific binding. To our knowledge, this is the first report that polarity inversion of G4 can be applied to construct a selective metal sensor with K + tolerance. Our findings will open a new way to conveniently regulate the G4 conformation and stability by polarity inversion towards developing high-performance sensors.
研究领域:
化学
·
材料科学
·
生物技术
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
MODERN PHYSICS LETTERS B
·
2024
·
IF 1.8
Zhi Li,Yuhan Jing,Qianxu Ye,Jie Wang,Nan Sun,Liexing Zhou,Jinming Cai
In this study, K 2 Ti 6 O 1 3 (KTO) nanowires were doped with carbon (CKTO) via a novel solid-phase approach at 800 ∘ C for the first time using ethanol, KF, and TiO 2 . In addition to the lower sintering temperature, a shorter insulation period was achieved compared to the conventional solid-phase method. Furthermore, by combining and calcining CKTO and g-C 3 N 4 , a CKTO/g-C 3 N 4 heterojunction composite was produced. The rate at which CKTO/g-C 3 N 4 photocatalytically degraded methylene blue was higher than those of pure CKTO and g-C 3 N 4 . Our study indicates that adding g-C 3 N 4 enhances photocatalytic performance by reducing the recombination rate of photogenerated electron–hole pairs and narrowing the bandgap of the CKTO/g-C 3 N 4 heterostructure. This paper presents a novel method for creating KTO composites in an eco-friendly and productive manner for the photocatalytic degradation of organic colors.
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2026
·Vol. 156
·期 4
·95
·
IF 2.5
Tang Zhanqiu,Fu Yuqing,Feng Xinyi,Wu Zhenglong,Qin Weidong
Enantioselective catalytic oxidation of d -glucose has been extensively applied in food, pharmaceutical, and chemical industries. In this work, a nitrogen-rich graphitic carbon nitride ( g- C 3 N 5 ) was synthesized through the pyrolysis of 3-amino-1,2,4-triazole. This material exhibited a reduced band gap, enhanced electrical conductivity, and superior photocatalytic performance compared to graphitic C 3 N 4 ( g- C 3 N 4 ), facilitating more efficient photocatalytic oxidation of glucose with higher yield. The surface of g- C 3 N 5 was subsequently capped with a molecularly imprinted polymer (MIP) layer by employing d -glucose as the template molecule, and 4-vinylphenylboronic acid as the functional monomer. The resulting g- C 3 N 5 -MIPs demonstrated the ability to selectively photocatalyze the oxidation of d -glucose, producing d -glu acid and H 2 O 2 . Notably, the relative selectivity coefficient for d -glucose over l -glucose increased by a factor of 8.79 compared to the non-imprinted g- C 3 N 5 . This work presents an effective approach for synthesizing advanced g-C 3 N 5 -MIP-based photocatalysts, and highlights their potential for highly enantioselective aerobic oxidation of d -glucose. Graphical
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HISTORICAL GEOGRAPHY
·
2020
·
IF 1.343
Marie de Rugy
Based on indigenous maps collected in British Burma by James George Scott (1851–1935) and kept at the Cambridge University Library, this paper offers an alternative history of the first years of British colonisation in Upper Burma in the 1880s and 1890s. The entangled scripts – Chinese characters, Shan, Burmese and English – as well as the materiality and the visual codes of these documents bring into view forms of contact that did not last long. Contextualising these maps with other kinds of sources – including Scott’s diaries and administrative reports – allows us to reconstruct their production as part of processes of intelligence gathering and frontier settlement. By tracing the more or less willing role of Burmese clerks, notables, guides and interpreters in the cartographic processes implemented by the English on the ground, we can reintroduce these actors into a history of cartography that has long been Eurocentric. Doing so reveals how the British had to rely on indigenous knowledge to control a territory quite unknown to them during the early years of colonisation.
研究领域:
制图史
·
殖民历史
·
东南亚研究
·
帝国主义
·
物质文化研究
✓ 已验证
DOI
高影响因子
Bioactive Materials
·
2022
·
IF 16.874
Yi Xiao,Haomin Yi,Jingzhi Zhu,Suhua Chen,Guofang Wang,Yilong Liao,Yuanyuan Lei,Liyin Chen,Xingcai Zhang,Fangfu Ye
Toxicity assessment is a major problem in pharmaceutical candidates and industry chemicals development. However, due to the lack of practical analytical methods for DNA adduct analysis, the safety evaluation of drug and industry chemicals was severely limited. Here, we develop a DNAzyme-based method to detect DNA adduct damage for toxicity assessment of drugs and chemicals. Among 18 structural variants of G4 DNAzyme, EA2 DNAzyme exhibits an obvious DNA damaging effect of styrene oxide (SO) due to its unstable structure. The covalent binding of SO to DNAzyme disrupts the Hoogsteen hydrogen bonding sites of G-plane guanines and affects the formation of the G4 quadruplex. DNA damage chemicals reduce the peroxidase activity of the G4 DNAzyme to monitor the DNA adduct damage by disrupting the structural integrity of the G4 DNAzyme. Our method for genotoxic assessment of pharmaceutical candidates and industrial chemicals can elucidate the complex chemical pathways leading to toxicity, predict toxic effects of chemicals, and evaluate possible risks to human health.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yaya Wang,Bo Wang,Ruixia Shi,Ling Chen,Quande Che,Junpeng Wang,Ping Yang
Graphic carbon nitride (g-C 3 N 4 ) as a typical photocatalyst has large specific surface area and high stability. However, the application for supercapacitors is limited because of its poor electrical conductivity. In this paper, three-dimensional (3D) g-C 3 N 4 /Mn 3 O 4 heterostructures with enhanced supercapacitor properties were constructed by a two-step synthesis. The precursor of 3Dg-C 3 N 4 /Mn 3 O 4 was firstly prepared by a freeze-drying process using NaCl as templates. After thermal polymerization at high temperature and subsequent removal of NaCl, 3D g-C 3 N 4 /Mn 3 O 4 heterostructures were constructed. As prepared samples revealed high specific capacitance performance which is related the well dispersion of Mn 3 O 4 in 3D g-C 3 N 4 networks to expose more redox catalytic centers. The result indicated with a current density of 1 A/g, the specific capacitance of sample prepared using optimized conditions was 753.9 F g −1 which is much higher than that of other samples. The stability test indicates the sample revealed high stability (84.1 %) after 5000 cycles under 5 A/g because of excellent structural stability of g-C 3 N 4 . The result provides a useful strategy for the application of g-C 3 N 4 in energy storage.
✓ 已验证
产品关联
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2023
·
IF 8.4
Jingjing Zhang,Yue Zhao,Kai Zhang,Amir Zada,Kezhen Qi
In this work, different mass percent ratios of CoFe 2 O 4 coupled g-C 3 N 4 (w%-CoFe 2 O 4 /g-C 3 N 4 , CFO/CN) nanocomposites were integrated through a hydrothermal process for the sonocatalytic eradication of tetracycline hydrochloride (TCH) from aqueous media. The prepared sonocatalysts were subjected to various techniques to investigate their morphology, crystallinity, ultrasound wave capturing activity and charge conductivity. From the investigated activity of the composite materials, it has been registered that the best sonocatalytic degradation efficiency of 26.71 % in 10 min was delivered when the amount of CoFe 2 O 4 was 25% in the nanocomposite. The delivered efficiency was higher than that of bare CoFe 2 O 4 and g-C 3 N 4 . This enriched sonocatalytic efficiency was credited to the accelerated charge transfer and separation of e − -h + pair through the S-scheme heterojunctional interface. The trapping experiments confirmed that all the three species i.e. • OH, h + and • O 2 − were involved in the eradication of antibiotics. A strong interaction was shown up between CoFe 2 O 4 and g-C 3 N 4 in the FTIR study to support charge transfer as confirmed from the photoluminescence and photocurrent analysis of the samples. This work will provide an easy approach for fabricating highly efficient low-cost magnetic sonocatalysts for the eradication of hazardous materials present in our environment.
✓ 已验证
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）