RSC Advances
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2017
·Vol. 7
·期 39
·24097-24104
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IF 3.108
Jie Meng,Jingyuan Pei,Zefang He,Shiyan Wu,Qingyun Lin,Xiao Wei,Jixue Li,Ze Zhang
Graphitic carbon nitride (g-C3N4) nanosheets loaded with WO3 nanoparticles were prepared via heat treatment of g-C3N4 together with WOx-EDA nanobelts. The thermal treatment temperature and WOx-EDA precursor play the key role in enhancing the interaction between WO3 nanoparticles and g-C3N4 nanosheets, because the temperature of thermal decomposition of WOx-EDA (∼400 °C) is close to the thermal exfoliation temperature of g-C3N4. The structure evolution and promotion effect of the nanocomposites in photocatalytic performance were well studied. It is found that WO3 nanoparticles uniformly dispersed on the surface of the g-C3N4 nanosheets, and the close integration of WO3 and g-C3N4 lead to the high photocatalytic activity in the degradation of RhB under visible light irradiation. Meanwhile, a larger specific area and increase of visible light absorption are also of benefit to speed up the degradation of organic dye. Also, the mechanism of the photocatalytic reaction and its reutilization properties were investigated.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Zhi Zhu,Xu Tang,Changchang Ma,Minshan Song,Nailing Gao,Youshan Wang,Pengwei Huo,Ziyang Lu,Yongsheng Yan
The ternary conductive Ppy@Ag/g-C 3 N 4 composite photocatalysts was successfully synthesized by polymerization process and surface polymerization technique. And the as-prepared Ppy@Ag/g-C 3 N 4 sample exhibited the higher photocatalytic activity for various pollutant (MO, DM, TC, CIP, GFLX and EH) remove than that of pure g-C 3 N 4 and Ag/g-C 3 N 4 under visible light irradiation. It mainly originated from the Ag nanoparticles anchored between g-C 3 N 4 and Ppy acted as electron transfer mediator that facilitated the charge carrier separation and then expending the lifetime of the carriers. Meanwhile, the obtained Ppy@Ag/g-C 3 N 4 sample also showed a relatively good recycling stability which was the crucial factor for photocatalyst practical application. This work provided a new facile strategy for improving photo-degradation activity of g-C 3 N 4 photocatalyst.
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ChemCatChem
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2017
·Vol. 9
·期 9
·1708-1715
·
IF 4.803
Jingtian Gao,Yun Wang,Shijian Zhou,Wei Lin,Yan Kong
Graphical Visibly better : A facile one-step pyrolysis process was developed to synthesize iron-doped graphitic carbon nitride nanosheets. The sample with 0.5 wt % FeCl 3 exhibited the best photocatalytic performance in the degradation of Methylene Blue and water splitting under visible light irradiation. A simple one-step pyrolysis process (compared with the routine method of liquid exfoliation and impregnation) was designed to synthesize Fe-doped graphitic carbon nitride (g-C 3 N 4 ) nanosheets with NH 4 Cl as dynamic gas template and FeCl 3 as the Fe source. Results of XPS and DRS indicated that the Fe species might exist at the state of Fe 3+ and form Fe−N bonds with N atoms, thereby expanding visible light absorption regions and reducing the band gap of g-C 3 N 4 nanosheets. Doping certain amounts of Fe could promote the exfoliation and further increase the specific surface area, while excessive Fe might break the sheet structure. The specific surface area of the optimized Fe-doped g-C 3 N 4 nanosheets reached 236.52 m 2 g −1 , which was 2.5 times higher than that of g-C 3 N 4 nanosheets. Among various photocatalysts prepared, the sample (0.5 wt % FeCl 3 ) exhibited maximum photocatalytic performance in degradation of Methylene Blue and water splitting under visible light irradiation. The degradation rate of MB was about 1.4 and 1.7 times higher than that of pure g-C 3 N 4 nanosheets and bulk g-C 3 N 4 , respectively. The H 2 production rate was 536 μmol h −1 g −1 , which was 1.8 and 6 times higher than that of pure g-C 3 N 4 nanosheets and bulk g-C 3 N 4 , separately.
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JOURNAL OF CATALYSIS
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2017
·
IF 6.844
Wei Chen,Yu-Xiang Hua,Ying Wang,Ting Huang,Tian-Yu Liu,Xiao-Heng Liu
A series of novel visible-light-driven MgIn 2 S 4 /g-C 3 N 4 (MISCN) heterostructures were fabricated in situ by a simple one-pot hydrothermal method. The synthesis of the MgIn 2 S 4 (MIS) nanoplates and the construction of intimate interfacial contacts by loading MIS nanoplates onto mesoporous g-C 3 N 4 (CN) nanosheets were achieved simultaneously in a hydrothermal environment. Systematic characterization, including powder X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), UV–vis diffuse reflection spectroscopy (UV–vis DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), and photoelectrochemical measurements were employed to analyze the phase structure, chemical composition, absorption properties, microstructure, and photocatalytic mechanism. The as-prepared MISCN photocatalysts exhibit improved photocatalytic activity for 4-nitroaniline (4-NA) reduction and methyl orange (MO) degradation as compared with pure MIS nanoplates and pristine CN nanosheets under visible light irradiation. The enhancement of photocatalytic performance can be attributed to faster charge separation and transport benefitting from the construction of tight heterogeneous interfaces and band offset structure between MIS nanoplates and mesoporous CN nanosheets. This investigation may be extended to explore and fabricate the novel and highly efficient visible-light-driven g-C 3 N 4 -based heterostructures for organic transformations and pollutant removal.
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APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Huihui Li,Xiaoyong Wu,Shu Yin,Kenichi Katsumata,Yuhua Wang
Novel g-C 3 N 4 /rutile-brookite TiO 2-x N y composite photocatalysts were fabricated through a facile solvothermal approach. The effect of rutile phase TiO 2 with brookite TiO 2 and g-C 3 N 4 on the photocatalytic activity of g-C 3 N 4 /nitrogen-doped TiO 2 composite was studied. The photocatalytic performance of the photocatalyst was evaluated by measuring the degradation of NO gas under visible and UV light irradiation. It is suggested that g-C 3 N 4 /rutile-brookite TiO 2-x N y forms a Z-scheme photocatalytic system, which shows improvement on the photocatalytic activity than that of g-C 3 N 4 /single brookite TiO 2-x N y . By importing rutile phase TiO 2-x N y , the photogenerated electrons can efficiently transfer from rutile TiO 2 to g-C 3 N 4 , which results in the separation of electron and hole pairs, enhancing the photocatalytic ability. However, single brookite TiO 2-x N y can not remove the photogenerated electrons efficiently and the photocatalytic performances of composites decrease with g-C 3 N 4 amount increase.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Jianqing Ma,Qunfeng Yang,Yuezhong Wen,Weiping Liu
Heterogeneous Fe-N complexes are a kind of promising catalysts for the Fenton-like reaction. The present study selected a stable and inexpensive g-C 3 N 4 as the chelating agent and combined with the graphitized mesoporous carbon (GMC). The fabricated Fe-g-C 3 N 4 /GMC composite was characterized by several techniques including FTIR, XRD, XPS, TEM and STXM. Results showed clear sheets of g-C 3 N 4 and graphite with Fe evenly distributed mostly in the Fe-N coordination form. The catalyst expressed high activity in the Fenton-like reaction in a wide pH range of 4–10. 99.2% removal of Acid Red 73 was obtained in 40 min, and the degradation data well fitted with the pseudo-first-order kinetics model. By correlating the constant of reaction rates calculated from the model and the Fe speciation contents of the samples prepared at different conditions, we deduced that Fe-N species are the most important active sites for the Fenton-like reaction. More importantly, hydroxyl radicals played a great role in the whole reaction yet their generation was independent of visible light. Cyclic voltammetry results confirmed that the GMC can accelerate the Fe(III)/Fe(II) redox cycle by enhancing electron transfer, and thus enable this Fenton-like catalyst to perform well in a wide pH range.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Jiajia Wang,Lin Tang,Guangming Zeng,Yaocheng Deng,Yani Liu,Longlu Wang,Yaoyu Zhou,Zhi Guo,Jingjing Wang,Chen Zhang
Although photocatalytic degradation is an ideal strategy for cleaning environmental pollution, it remains challenging to construct a highly efficient photocatalytic system by steering the charge flow in a precise manner. In this study, a novel atomic scale g-C 3 N 4 /Bi 2 WO 6 heterojunction (UTCB) constructed by ultrathin g-C 3 N 4 nanosheets (ug-CN) and monolayer Bi 2 WO 6 nanosheets (m-BWO) was successfully prepared by hydrothermal reaction. The UTCB heterojunctions were characterized by various techniques including XRD, TEM, AFM, BET measurements, UV–vis spectrometry, and XPS. The results indicated that UTCB heterojunctions were assembly of m-BWO on ug-CN and presented high separation efficiency of photogenerated carriers. Under visible light irradiation, the optimum molar ratio of ug-CN/m-BWO (1:4, UTCB-25) reached almost 96.1% removal efficiency of IBF within 1 h, which was about 2.7 times as that of pure m-BWO. The photocatalytic mechanisms of UTCB-25 were revealed, suggesting that the synergistic effect of UTCB-25 heterojunction with strong interfacial interaction promoted the photoinduced charge separation. According to the LC–MS/MS, five photodegradation pathways of IBF under visible light irradiation were proposed. This study could open new opportunities for the rational design and a better understanding of atomic scale two dimensions/two dimensions (2D/2D) heterojunctions in environmental or other applications.
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ChemElectroChem
·
2017
·Vol. 4
·期 7
·1768-1774
·
IF 4.136
Qiao Liu,Yu-Jiao Peng,Jin-Chun Xu,Cheng Ma,Lingling Li,Chang-Jie Mao,Jun-Jie Zhu
Graphical No need for labels : A feasible label-free electrochemiluminescence aptasensor using an Au-nanoparticle-functionalized g-C 3 N 4 nanohybrid as the luminophore is constructed for the sensitive detection of acetylcholinesterase. A feasible label-free electrochemiluminescence (ECL) aptasensor that uses an Au-nanoparticle-functionalized g-C 3 N 4 nanohybrid (Au-g-C 3 N 4 NH) as the luminophore was constructed for highly sensitive acetylcholinesterase (AChE) detection. The sensor was fabricated by successively modifying a glassy carbon electrode with Au-g-C 3 N 4 NH and thiol-modified AChE-specific aptamers. In the presence of AChE, the ECL signal decreased significantly, because AChE could hydrolyze the substrate acetylthiocholine to generate acetic acid, which could react with the co-reactant triethylamine (Et 3 N), leading to evident consumption of the co-reactant. The ECL response of the aptasensor was linearly proportional to the concentration of AChE ranging from 0.1 pg/mL to 10 ng/mL, with a detection limit of 42.3 fg/mL ( S / N =3). This novel ECL sensing strategy demonstrated a highly sensitive and selective method for AChE detection and was expected to possess potential applications in clinical diagnosis and biomedical technology.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Chunlei Yang,Xiu Wang,Haiyun Liu,Shenguang Ge,Mei Yan,Jinghua Yu,Xianrang Song
A fluorescent sensor for the determination of glutathione (GSH) has been developed, which is based on the absorption of a newly designed thiols-specific chromogenic probe (CP) coupled with the use of a thiols-independent fluorophore g-C 3 N 4 nanosheets. It was operated on the inner filter effect (IFE). To construct an efficient IFE system, the CP molecules were adsorbed on the surface of g-C 3 N 4 nanosheets via π–π stacking interaction. When the biothiol introduced the systems, the weak fluorescence would be restored because of “IFE off”. The novel IFE sensor was established for GSH and regarded it as a model target analyte. The IFE sensor had a sensitive response for GSH in a linear range of 0.05 μM L −1 to 1.0 μM L −1 and the limit of detection was 0.01 μM. The sensor was successfully applied for the quantitative detection of biothiols in human serum. Additionally, the proposed sensor shows high specificity and sensitivity.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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2016
·Vol. 18
·期 46
·31513-31520
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IF 4.449
Yumeng Liu,Xiao Zhang,Junpeng Wang,Ping Yang
In this study, the nano-heterostructures of Zn1−xCdxS (0 < x < 1) nanoparticles and small g-C3N4 nanosheets (Zn1−xCdxS/CN) were prepared via in situ growth. Bulk g-C3N4 was first delaminated into thin layers by an acid and alkali assisted ultrasound method. Zn1−xCdxS nanoparticles were deposited on the surface of small g-C3N4 nanosheets in situ to fabricate Zn1−xCdxS/CN photocatalysts. The absorption band edges of the as-prepared Zn1−xCdxS/CN composites shifted to a longer wavelength region compared to g-C3N4. The Zn1−xCdxS/CN heterojunctions revealed super-enhanced visible-light photocatalytic activities compared to pure g-C3N4 and Zn1−xCdxS nanoparticles. To investigate the composition dependence, the mass ratios of Zn1−xCdxS and g-C3N4 were adjusted. Zn0.8Cd0.2S nanoparticles (5 wt%) grown in situ on g-C3N4 nanosheets as sample 5-Zn0.8Cd0.2S/CN revealed a very high photocatalytic activity compared to other Zn0.8Cd0.2S/CN and CdS/CN samples where the degradation of RhB was up to 99% within 15 min under visible light irradiation. This was ascribed to the well-matched band gap structure, large specific surface area and intimately contacted interfaces. The controllable band gap of the Zn1−xCdxS/CN composites was a key factor for their enhanced photocatalytic performance. In addition, O2− was the leading reactive oxidative species in this photocatalytic process in the 5-Zn0.8Cd0.2S/CN composite system.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Xiaochen Yu,Xiao He,Xu Zhang,Yadi Peng,Pengfei Zhao,Ziqiao Zhang,Yifan Liu,Lingcheng Zhang,Peng Zhao
Element doping strategies are commonly employed to achieve effective photocatalysts. In this work, a novel form of P and Ce co-doped g-C 3 N 4 nanosheets was synthesized using a one-step thermal polymerization technique, exhibiting remarkable efficiency in the degradation of organic pollutants under visible light. The prepared catalysts underwent comprehensive characterization through XRD, FT-IR, SEM, TEM, BET, XPS, UV–vis, PL, and electrochemical testing. The electronic and optical properties of the catalysts were further elucidated using first-principles density functional theory (DFT). In the photocatalytic experiment of degrading Rhodamine B (RhB), the photocatalytic ability of g-C 3 N 4 nanosheets was improved at different degrees, among which g-C 3 N 4 nanosheets co-doped with P and Ce showed the highest photocatalytic activity, with a degradation efficiency of 90.58 % for RhB. Furthermore, the photocatalytic mechanism was confirmed through free radical capture experiments. This study presents a novel approach for the development of efficient photocatalysts to remove pollutants.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Chuhan Huang,Yu Ma,Qian Cheng,Xiaohan Liu,Hongman Sun,Fazle Subhan,Xinyuan Zhao,Youhe Wang,Zifeng Yan
The fundamental insights into the reaction mechanism, especially the electron transfer mechanism, are highly promising yet challenging for W 18 O 49 /g-C 3 N 4 heterojunction catalysts during photocatalytic nitrogen fixation. Herein, the 1D/2D nanostructured S-scheme heterojunctions were designed by in situ growth of 1D W 18 O 49 nanowires on 2D g-C 3 N 4 nanosheets through solvothermal method using methanol as solvent. In situ XPS analysis revealed that electrons in the conduction band of W 18 O 49 recombine with holes in the valence band of g-C 3 N 4 under the conduction effect of internal electric field, band bending, and Coulombic attraction in the W 18 O 49 /g-C 3 N 4 heterojunction. The photogenerated electrons are retained in g-C 3 N 4 , where the negative reduction potential of its conduction band enhances the activation of N 2 . As a result, the ammonia generation rate employing the optimal W 18 O 49 /g-C 3 N 4 heterojunction is 64.8 μmol g cat −1 h −1 , approximately double that of W 18 O 49 alone and 2.3 times higher than that of g-C 3 N 4 . The enhanced activity and facile methodology make the current material exceedingly appealing for implementation in photocatalytic nitrogen fixation for the synthesis of ammonia.
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