JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 51
·期 2
·893-902
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IF 2.371
Wang Desong,Xu Zexuan,Luo Qingzhi,Li Xueyan,An Jing,Yin Rong,Bao Cai
An efficient visible-light photocatalyst was successfully synthesized by surface-hybridizing graphitic carbon nitride (g-C 3 N 4 ) using a small amount of cadmium sulfide (CdS) nanoparticles. The CdS/g-C 3 N 4 nanocomposites were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, electrochemical impedance spectroscopy, and photocurrent–time measurement. The photocatalytic activity of the CdS/g-C 3 N 4 nanocomposites was investigated by evaluating the degradation of Rhodamine B (RhB) under visible-light irradiation. The effects of the CdS content on the nanocomposites, initial RhB concentration, pH value of the investigated system, and dosage of CdS/g-C 3 N 4 nanocomposites on the visible-light photocatalytic activity were systematically investigated. The results revealed that the visible-light photocatalytic activity of g-C 3 N 4 -based photocatalysts was significantly improved by surface-hybridization of a small amount of CdS nanoparticles, increased as both CdS content on the nanocomposites and dosage of CdS/g-C 3 N 4 nanocomposites increased, while increased at first and then decreased as both initial RhB concentration and pH value of the investigated system increased. The visible-light photocatalytic mechanism of the CdS/g-C 3 N 4 nanocomposites was discussed.
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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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ChemCatChem
·
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
·
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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RSC Advances
·
2017
·Vol. 7
·期 39
·24097-24104
·
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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PLoS One
·
2017
·Vol. 12
·期 3
·e0172747
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IF 2.806
Xinying Zhang,Yan Wu,Gao Xiao,Zhenping Tang,Meiyin Wang,Fuchang Liu,Xuefeng Zhu
Azo dyes are very resistant to light-induced fading and biodegradation. Existing advanced oxidative pre-treatment methods based on the generation of non-selective radicals cannot efficiently remove these dyes from wastewater streams, and post-treatment oxidative dye removal is problematic because it may leave many byproducts with unknown toxicity profiles in the outgoing water, or cause expensive complete mineralization. These problems could potentially be overcome by combining photocatalysis and biodegradation. A novel visible-light-responsive hybrid dye removal agent featuring both photocatalysts (g-C 3 N 4 -P 25 ) and photosynthetic bacteria encapsulated in calcium alginate beads was prepared by self-assembly. This system achieved a removal efficiency of 94% for the dye reactive brilliant red X-3b and also reduced the COD of synthetic wastewater samples by 84.7%, successfully decolorized synthetic dye-contaminated wastewater and reduced its COD, demonstrating the advantages of combining photocatalysis and biocatalysis for wastewater purification. The composite apparently degrades X-3b by initially converting the dye into aniline and phenol derivatives whose aryl moieties are then attacked by free radicals to form alkyl derivatives, preventing the accumulation of aromatic hydrocarbons that might suppress microbial activity. These alkyl intermediates are finally degraded by the photosynthetic bacteria.
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高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 8
·1726-1734
·
IF 5.773
Waheed Iqbal,Chunyang Dong,Mingyang Xing,Xianjun Tan,Jinlong Zhang
We report a facile and eco-friendly one-pot synthesis of well-adorned mesoporous g-C3N4 material through a bubble templating strategy and involving controlling the surface area from 17 to 195 m2 g−1 by simply adjusting the mass ratio of melamine/NH4Cl. Various characterization techniques were adopted to examine the structures and physicochemical properties of the as-prepared mpg-C3N4 samples. The results are a step forward to the bottleneck problems of producing mesoporous g-C3N4 materials with both a high BET surface area with well-adorned pore diameters and considerable pore volume by simply employing ammonium chloride as a gaseous bubble template and melamine as a g-C3N4 precursor. The obtained ammonium chloride-mediated mesoporous g-C3N4 photocatalyst demonstrated excellent photocatalytic performance compared with bulk g-C3N4 for the visible light photodegradation of RhB and phenol. The extraordinary photocatalytic activity and outstanding stability of the as-prepared mesoporous g-C3N4 were predominantly attributed to the exceptionally high surface area with ordered pore diameters, improved optical absorbance, and efficient charge separation. Our work not only exhibits the simplest, eco-friendly, and economical approach to fabricate highly efficient well-adorned mesoporous g-C3N4 photocatalysts, but also paves new opportunities for the rational design and synthesis of advanced photocatalysts with great potential in environmental remediation.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
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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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jinxin Liu,Jinyuan Liu,Qichang Peng,Bin Wang,Xingwang Zhu,Xue Gao,Huaming Li,Hui Xu,Paul K. Chu
A Z-scheme heterojunction is designed and demonstrated to enhance the separation efficiency of photocatalytic carriers. In this paper, the 2D/2D Sb 2 WO 6 /g-C 3 N 4 (SWO/CN) Z-scheme heterojunction fabricated by electrostatic self-assembly has better degradation activity than individual Sb 2 WO 6 and g-C 3 N 4 . The rate constant K (0.0194 min −1 ) of RhB degradation by 40 % SWO/CN was higher than that of Sb 2 WO 6 (0.0054 min −1 ) and g-C 3 N 4 (0.0039 min −1 ). The rate constant K of 40 % SWO/CN for MBT degradation was 0.4391 h −1 , which was 2.96 and 9.32 times that of g-C 3 N 4 (0.1484 h −1 ) and Sb 2 WO 6 (0.0471 h −1 ). The photocurrent response and electrochemical impedance spectroscopy (EIS) reveal that the Z-scheme heterojunction facilitates the separation of photogenerated charge carriers. Electron spin resonance (ESR) and radical trapping experiments demonstrate the pivotal roles of holes (h + ), superoxide (·O₂ - ), and singlet oxygen ( 1 O₂) in the catalytic degradation process. The results provide insights into the design of high-performance 2D/2D Z-scheme photocatalysts and a fundamental framework for further enhancement.
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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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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Gang Liu,Sheng Xu,Wenting Li,Zhenxi Wang,Jinlong Cui
In order to expand the photoresponsive spectrum of TiO 2 and improve its catalytic activity under visible light, the hollow urchin-like composites of TiO 2 @g-C 3 N 4 /GQDs (TCN/GQDs) with a core-shell structure heterojunction was synthesized through a hydrothermal method and calcination. Potassium titanium oxalate, melamine, and citric acid were utilized as the raw materials for this synthesis process. The TCN/GQDs composites were subjected to a range of analyses to examine their microstructure and photoelectric properties. The findings indicated that the synthesized composites effectively enhanced the absorption spectrum of TiO 2 in the visible light range by creating the stable heterojunctions among TiO 2 , g-C 3 N 4 and GQDs. Additionally, the ability of these composites to degrade toxic organic pollutants under visible light was studied by using several different organic dyes and antibiotics. The results demonstrated that the TCN/GQDs composites exhibited efficient visible light catalytic degradation capability on organic pollutants, and the degradation efficiency could approach to 100 % under visible light in a short time. Furthermore, the photocatalyst exhibited hardly change of degradation efficiency towards organic pollutants even after 5 cycles of testing, suggesting its commendable performance in visible light catalysis and potential for repeated utilization.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Ruiting Li,Tengyang Gao,Yao Wang,Yan Chen,Wen Luo,Yang Wu,Yu Xie,Yong Wang,Yifan Zhang
The application of metal catalysis has gained prominence as a study area in recent years. In this work, we use adsorptive reduction and calcination to create Au–Pd alloy catalysts on COCN-2 with varying metal loadings. The plasma resonance effect of the alloys increases the photoresponse of the catalysts, and the engineering of nitrogen defects strengthens the strong bonds between Au–Pd alloy particles and carbon nitride graphite, optimizing the electronic structure, encouraging electron-directed migration, and increasing the efficiency of the reduction reaction. As a result, the efficiency of hydrogen generation by the Au–Pd 0.6 /COCN-2 catalyst is 5.089 mmol g −1 h −1 , which is 2367 times higher than that of the g-C 3 N 4 catalyst. Our findings highlight the crucial part that flaws play in strengthening the strong bonds that exist between the metal and the support, which enhances photocatalytic hydrogen generation. This work offers insightful information about creating effective photocatalysts.
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