TALANTA
·
2018
·
IF 4.244
Ke Li Lin,Tong Yang,Hong Yan Zou,Yuan Fang Li,Cheng Zhi Huang
Here we first reported that graphitic carbon nitride nanosheet (g-C 3 N 4 NS) could effectively quench the chemiluminescence (CL) of luminol-hydrogen peroxide (H 2 O 2 ) system. According to the new discovery, a label-free and homogeneous CL aptasensing platform was designed for sensitive detecting of biomarkers. In the absence of target, DNA probe containing hemin/G-quadruplex DNAzyme structure was adsorbed on the surface of g-C 3 N 4 NS, causing the CL quenching of luminol through an electron transfer process. However, in the presence of the target, a DNA-DNA duplex was formed due to DNA hybridization reaction and target recognition effect, which could not be adsorbed onto the g-C 3 N 4 NS surface because of its weak affinity. Thus, the electron transfer was blocked and the CL emission of luminol could be enhanced. The proposed CL aptasensor could detect carcinoembryonic antigen (CEA) with a detection limit of 63.0 pg/mL and it can also be used as a general detecting strategy for adenosinetriphosphate (ATP) detection. This aptasensing platform exhibited high sensitivity toward biomarkers and the probe need not be labeled, showing great promise for disease diagnosis.
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高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Yunyan Wu,Yazhou Zhou,Han Xu,Qinqin Liu,Yi Li,Lili Zhang,Hanqing Liu,Zhigang Tu,Xiaonong Cheng,Juan Yang
The goal of this paper is to develop a bactericidal photocatalyst silver/polydopamine/graphitic carbon nitride (Ag/PDA/g-C3N4) as a new type of antibacterial material with high activity, superstability, and excellent biocompatibility. Small Ag NPs (3.6–10.5 nm) disperse uniformly on the PDA-modified g-C3N4 sheets. This biophotocatalyst has excellent antibacterial activity against Escherichia coli, including low MIC100%Ag of 9.5 ppm and MBC100%Ag of 6.3 ppm but also a low cytotoxicity for human umbilical vein endothelial cells (HUVECs) because of biocompatible PDA. After 30 days in an air environment, only 0.18% of Ag+ was detected, which indicated the superstability of this biophotocatalyst compared with the state-of the-art antibacterial materials. The possible bactericidal mechanism is the synergistic effect between photocatalytic PDA-modified g-C3N4 and active Ag NPs. The Ag NPs themselves have strong antibacterial activity due to their small sizes. Importantly, under light irradiation, the surface plasmonic effect of Ag NPs and the incorporation of PDA enhance the photocatalytic activity of g-C3N4 significantly by increasing its light absorption, improving photoconductivity for photogenerated electrons and holes, and inhibiting their recombination. As a result, the sufficient radicals such as •OH and O2•– radicals can be formed. The radicals, particularly •OH, together with holes, can accelerate the death of bacteria through the destruction of biomolecules.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Yi Chen,Wangyang Lu,Haibin Shen,Yan Gu,Tiefeng Xu,Zhexin Zhu,Gangqiang Wang,Wenxing Chen
Solar-driven photocatalysis has shown tremendous potential for environmental remediation, but photocatalysts with the strong oxidation ability usually destroy some organic carriers. Herein, we constructed a graphitic carbon nitride (g-C 3 N 4 )-shielding polyester fiber (PET)/titanium dioxide (TiO 2 ) composite (g-C 3 N 4 -TiO 2 @LMPET) by using g-C 3 N 4 as an isolation layer to protect the PET from the oxidation damage by hydroxyl radicals ( OH). The results of photoluminescence and photocurrent indicated that the g-C 3 N 4 -TiO 2 @LMPET has lower photogenerated charge recombination rate. Meanwhile, g-C 3 N 4 broadens the absorption range of the composite to visible region. Therefore, the g-C 3 N 4 -TiO 2 @LMPET composite exhibited a significantly enhanced photocatalytic performance toward the degradation of sulfaquinoxaline (SQX) and thiamethoxam under solar irradiation. Moreover, the g-C 3 N 4 -TiO 2 @LMPET exhibited good repeatability in cyclic experiments. Finally, the possible degradation pathways and mechanisms of SQX and thiamethoxam were proposed. Overall, our work provides a feasible method for constructing efficient and stable photocatalytic materials to eliminating emerging contaminants.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Huizhi Xie,Jing Dong,Junling Duan,Juying Hou,Shiyun Ai,Xiangyang Li
With the porous g-C 3 N 4 nanosheets (pg-CNNSs) as fluorescence probes and AFB1–bovine serum albumin conjugate modified Fe 3 O 4 magnetic nanoparticles (MNPs) as immunosensing probes, a simple sensitive aflatoxin B1 (AFB1) detection method was first constructed. Based on the simple preparation method, the excellent biocompatibility, strong fluorescence emission and proper emission wavelength, pg-CNNSs were first functionalized by AFB1 antibody as fluorescence probes, which can bind with MNPs through antigen-antibody immunoreaction to form the pg-CNNSs-MNPs complexes. After magnetic separation, the fluorescence intensity of the complexes was tested. The target analyte (AFB1) can interfere the above immunoreaction by direct competition with immunosensing probes, and lead to the signal decreased. The detection limit for AFB1 was as low as 0.002 ng mL −1 under optimal conditions. Additionally, the applicability of this method was also confirmed in adulterated maize samples.
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RSC Advances
·
2014
·Vol. 4
·期 92
·51008-51015
·
IF 3.708
Jing Wang,Peng Guo,Maofeng Dou,Jing Wang,Yajuan Cheng,Pär G. Jönsson,Zhe Zhao
The g-C3N4/m-Ag2Mo2O7 composite photocatalysts with well-aligned band structures are successfully fabricated by a simple two-step method with different mass contents of m-Ag2Mo2O7. The as-prepared samples are evaluated as photocatalysts toward rhodamine B (RhB) degradation in aqueous solution under visible light irradiation (λ > 420 nm). The results demonstrate that the photocatalytic activities of the composites are strongly influenced by the weight ratio of g-C3N4 to m-Ag2Mo2O7. When it is 6 : 1, the composite exhibits the highest photocatalytic efficiency. More specifically, this value is as high as 3.4 and 6.1 times that of pure g-C3N4 and P25 respectively. In order to investigate the mechanism causing the enhanced photocatalytic degradation, the band structures are determined by UV-vis diffuse reflection spectroscopy and the Mott–Schottky technique. Moreover, the reactive radicals involved in the photocatalytic process are examined in detail via active species trapping (AST) experiments. The improved photocatalytic activities can be attributed to the efficient separation of the photo-induced charge carriers and the strong redox capacities benefit from the synergetic effect between g-C3N4 and m-Ag2Mo2O7.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Zengyu You,Yuxuan Su,Yang Yu,Hui Wang,Tian Qin,Fang Zhang,Qianhong Shen,Hui Yang
A novel g-C 3 N 4 nanorod/InVO 4 hollow sphere composite was fabricated through a facile template-free method. The structure-property relationship was analyzed, and the formation mechanism of such structure and morphology was also proposed based on the observation from time-dependent morphology evolvement. The results show that InVO 4 hollow spheres uniformly load on the surface of g-C 3 N 4 nanorod and thus forming the heterojunction with an intimate interface. The bulk g-C 3 N 4 experiences a possible peeling process to form the rod-like structure, during which the mass ratio of InVO 4 and ultraphonic process play a key role. Moreover, bubble-template is believed to determine the formation of InVO 4 hollow sphere. Owing to this unique structure and morphology, the enhanced visible-light photocatalytic activities are achieved because of the synergistic effect of light harvesting, high transfer efficiency and enhanced separation efficiency of photo-generated carriers. And more importantly, this fabrication method combines heterojunction constructing with morphology controlling of g-C 3 N 4 in one step, and thus may supply a new idea for the preparation of other g-C 3 N 4 based composites.
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高影响因子
Science Bulletin
·
2016
·
IF 0
Xiaoping Liu,Hao Qin,Weiliu Fan
Band offset is a dominant factor affecting the photocatalytic performance of heterostructure photocatalysts . Therefore, controlling the band gap structure of semiconductors is a key challenge in the development of efficient photocatalysts. We used a typical in situ-method to prepare diverse graphite-phase carbon nitride (g-C 3 N 4 ) samples from melamine , thiourea , and a mixture thereof, and found that they exhibited band gaps between 2.3–2.8 eV. From UV–Vis spectra and X-ray photoelectron spectroscopy measurements, we determined that the g-C 3 N 4 samples exhibited different band gap values and valence band positions. On this basis, we constructed g-C 3 N 4 /m-LaVO 4 heterojunctions with different band offsets. UV–Vis spectra and X-ray photoelectron spectroscopy measurements revealed that the valence band offsets (VBOs) of the different heterojunctions were similar, but their conduction band offsets (CBOs) were significantly different. Photocatalytic experiments revealed that the reaction rate was enhanced with an increase in the CBO value. Furthermore, the three-phase g-C 3 N 4 /g-C 3 N 4 /m-LaVO4 heterojunction composed of m-LaVO4 and mixed g-C 3 N 4 showed the highest photocatalytic activity , which was mainly due to the construction of a multilevel structure. This work investigates the influence of the band offset on heterojunction photoelectrochemical properties and provides a new strategy to improve the photocatalytic activity by constructing multilevel structures.
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NANOTECHNOLOGY
·
2017
·Vol. 28
·期 49
·495710
·
IF 3.44
Ruiru Zhao,Jianping Gao,Shunkang Mei,Yongli Wu,Xiaoxue Wang,Xiangang Zhai,Jiangbing Yang,Chaoyue Hao,Jing Yan
A simple and convenient method was used to synthesize a graphitic carbon nitride (g-C3N4) nanoporous-tube by using SiO2 nanoparticles as pore formers. The structure of the g-C3N4 nanoporous-tube was characterized by the SEM and TEM images. Taking photodegradation of RhB as an example, the photocatalytic activity of the as-prepared g-C3N4 nanoporous-tube was investigated. It can photodegrade 90% RhB in 40 min under visible-light irradiation and obtain a k value of 0.04491 min−1, which is 8.16 times that of bulk g-C3N4, 3.09 times that of tubular g-C3N4 and 1.48 times that of tubular g-C3N4-SiO2. The significant enhancement in photocatalytic efficiency is due to the edge effect of the pores and the special structure of the tubes. In addition, the possible mechanism of photocatalytic degradation of RhB was also proposed based on the trapping experiment of active species, which indicated that the superoxide radicals (O2∙−) and the holes (h+) were the main reactive species in this photocatalyst. This work may open up a new idea of innovation in g-C3N4 structure and inspire its follow-up study.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Jing Ding,Wei Xu,Hui Wan,Dashui Yuan,Chong Chen,Lei Wang,Guofeng Guan,Wei-Lin Dai
Vacancy defect in the semiconductors plays an important role in the improvement of the electronic structure and the increase of specific reaction sites for reactant molecules, and consequently enhancing the photocatalytic activity of semiconductor photocatalysts. Through high-temperature thermal condensation of a nitric acid-pretreated melamine precursor, nitrogen vacancies were successfully introduced in the framework of g-C 3 N 4 . The nitrogen vacancies located at the uncondensed terminal NH x lattice sites were conducive to the enhancement of optical absorption, the improvement of the separation efficiency of the photogenerated charge carrier and the increase of surface area, which was beneficial to the photocatalytic oxidation process. More significantly, the novel CNNA(X) were used as efficient photocatalysts in the green process of aromatic aldehydes from the photocatalytic selective oxidation of aromatic alcohols and the photocatalytic degradation of organic pollutants. CNNA(X) samples exhibited enhanced photocatalytic activity and excellent recyclability and stability. The 68.3% benzyl alcohol conversion and almost 100% selectivity was observed for the CNNA (0.9) photocatalyst, higher than that of pure g-C 3 N 4 . Meanwhile, CNNA (0.9) showed superior photocatalytic degradation performance of organic dyes (RhB and MO). Furthermore, the underlying photocatalytic oxidation mechanism was proposed by the controlled experiments using radical scavengers.
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NANOTECHNOLOGY
·
2016
·Vol. 27
·期 35
·355402
·
IF 3.573
Chunyan Zhang,Yongfeng Lu,Qingqing Jiang,Juncheng Hu
CdS hollow spheres (CdS HS) coupled with graphitic carbon nitride (g-C3N4) photocatalysts are synthesized and characterized by x-ray diffraction (XRD), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflection spectroscopy (DRS), x-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and photoluminescence spectroscopy (PL). The effect of CdS content on CdS HS/g-C3N4 activity is investigated by the degradation of Rhodamine B (RhB). The sample of 20 wt% CdS content shows the best photocatalytic performance under visible-light irradiation, with the corresponding RhB degradation rate reaching 97.3%. The excellent photoactivity of CdS HS/g-C3N4 is attributed to the synergistic effect of g-C3N4 and CdS HS. A possible photocatalytic mechanism of the CdS HS/g-C3N4 composite is proposed and corroborated by PL.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 75
·70747-70755
·
IF 3.289
Huijie Dong,Mingyu Wei,Jun Li,Jia Fang,Long Gao,Xiaoxia Li,Aihua Xu
A graphitic carbon nitride-containing MCM-41 catalyst (g-C3N4/MCM-41) was prepared through an in situ thermal approach and characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy, N2 adsorption–desorption and X-ray photoelectron spectroscopy. It was found that Acid Orange 7 (AO7) and other five organic dyes can be completely degraded by the g-C3N4/MCM-41 catalyst within 30 min in the presence of peroxymonosulfate (PMS), while g-C3N4 + PMS and MCM-41 + PMS show nearly no activity. A non-radical pathway accompanied by radical generation in PMS activation and AO7 oxidation is proposed. The oxidized carbon species N–C–O on g-C3N4 with strong electron density plays a key role in the reaction, while the large surface area of the catalyst can also efficiently enhance the accessibility of catalytic active sites. Though the reusability of the g-C3N4/MCM-41 catalyst is not very good as that of metal oxide catalysts, its activity can be recovered by KOH treatment. The study can broaden the application of g-C3N4 in the area of wastewater treatment.
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Catalysts
·
2025
·Vol. 15
·期 1
·95
·
IF 4
Jinghong Fang,Min Wang,Xiaotong Yang,Qiong Sun,Liyan Yu
In this study, a novel Z-scheme heterojunction photocatalyst was developed by integrating g-C3N4nanoplates into ZnIn2S4microspheres. X-ray photoelectron spectroscopy analysis revealed a directional electron transfer from g-C3N4to ZnIn2S4upon heterojunction formation. Under irradiation, electrochemical tests and electron paramagnetic resonance spectroscopy demonstrated significantly enhanced charge generation and separation efficiencies in the ZnIn2S4/g-C3N4composite, accompanied by reduced charge transfer resistance. In photocatalytic CO2reduction, the ZnIn2S4/g-C3N4composite achieved the highest CO yield, 1.92 and 5.83 times higher than those of pristine g-C3N4and ZnIn2S4, respectively, with a notable CO selectivity of 91.3% compared to H2(8.7%). The Z-scheme heterojunction mechanism, confirmed in this work, effectively preserved the strong redox capabilities of the photoinduced charge carriers, leading to superior photocatalytic performance and excellent long-term stability. This study offers valuable insights into the design and development of g-C3N4-based heterojunctions for efficient solar-driven CO2reduction.
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