COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Hong Yan,Zengwei Zhu,Yumei Long,Weifeng Li
In this paper, in-situ coupling of WO 3 with g-C 3 N 4 (WO 3 /g-C 3 N 4 ) was demonstrated by using melamine tungstate as a single-source precursor. The as-prepared WO 3 /g-C 3 N 4 nanocomposites were structurally characterized by X-ray diffraction (XRD), fourier transform infrared (FTIR) and transmission electron microscopy (TEM). It was found that the single-source precursor not only ensures the close contact between WO 3 and g-C 3 N 4 , but also endows the porous structure of the product. Thus, the increased visible-light absorption, effective charge separation and enlarged surface area (22.64 m 2 /g) were achieved for the resultant product. The experimental results showed that WO 3 /g-C 3 N 4 heterostructure possesses excellent photocatalytic activity for degrading methyl orange (MO) and tetracycline (TC) under the visible light irradiation. Moreover, WO 3 /g-C 3 N 4 (5 wt%) sample exhibited the best photocatalytic activity. The radicals trap experiments revealed that both •O 2 − and holes make great contribution to the degradation of pollutants. Accordingly, a Z-scheme charge migration and recombination mechanism was proposed to elucidate the improved photocatalytic properties of WO 3 /g-C 3 N 4 . This study offers a new pathway for optimizing the microstructure of g-C 3 N 4 -based function materials and for improving their photocatalytic properties.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Kedir Ebrahim Ahmed,Dong-Hau Kuo,Misganaw Alemu Zeleke,Osman Ahmed Zelekew,Angaw Kelemework Abay
Sn-WO 3 /g-C 3 N 4 composites were synthesized by calcination method. The materials were characterized with different techniques and photocatalytic activities examined by the degradation of anionic methyl orange (MO) and cationic Rhodamine B (RhB) under visible light. 8% Sn-WO 3 /g-C 3 N 4 showed superior degradation efficiency with 87% MO and 99% RhB dye removal within 120 and 50 min of irradiation time, respectively. X-ray photoelectron spectroscopy (XPS) analysis reveals molecular oxygen adsorption on the surface of the as-prepared composite material. The introduction of tin in Sn-WO 3 solid solution with a high atomic Sn:W ratio of 1:2 and the construction of interfacial hetrojunction with graphitic carbon nitride (g-C 3 N 4 ) plays a vital role to enhance the photocatalytic activity of the as-prepared composites by activating oxygen to react with dye molecules.
研究领域:
材料科学
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环境科学
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光催化技术
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
Novel hierarchical sheet-on-sheet WO 3 /g-C 3 N 4 (WOCN) composites were successfully fabricated by simple calcination method using acid-treated SrWO 4 /g-C 3 N 4 as precursors. The morphological observation showed that WO 3 nanosheets were closely anchored on the surface of g-C 3 N 4 nanosheets to construct a hierarchical nanostructure . The as-synthesized WOCN composites exhibited a significantly higher photocatalytic activity towards the photocatalytic degradation of rhodamine B (RhB) compared to pristine g-C 3 N 4 and WO 3 under simulated sunlight irradiation. The optimum photocatalytic activity of the WOCN at a WO 3 mass content of 34.6% was 6.5 and 3.0 times higher than that of pristine WO 3 and g-C 3 N 4 , respectively. The enhanced photocatalytic activities of WOCN composites were attributed to the formation of hierarchical heterostructure , which provided larger specific surface area, better visible-light absorption capability, reduced the recombination of photogenerated electron-hole pairs and enhanced separation efficiency of charge carriers. A Z-scheme photocatalytic mechanism was proposed according to active species trapping experiments.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 11
·e202202184
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IF 8.4
Shaoru Tang,Yanan Ma,Haimeng Wang,Yuxuan Liang,Xiaoyang Xu,Dingyu Zhang,Beiming Cao,Qian Wang,Wei Li
Graphical Reverse the microemulsion : Through adjusting the phase inversion in the reverse microemulsion system by using supercritical carbon dioxide, 2D/2D WO 3 /g-C 3 N 4 heterojunction photocatalyst is constructed via a one-pot method, which exhibits excellent photocatalytic activities towards the hydrogen evolution during water splitting. Construction of Z-scheme photocatalyst is an effective approach for using solar energy to produce hydrogen during water splitting. Herein, 2D/2D WO 3 /g-C 3 N 4 heterojunction photocatalyst was synthesized by a convenient and green method including exfoliation and heterojunction procedures, in the reverse microemulsion system via supercritical carbon dioxide (scCO 2 ). The resultant W/CN-10.3 composite exhibited enhanced photocatalytic activities towards the hydrogen evolution during water splitting with a hydrogen evolution rate of 688.51 μmol g −1 h −1 , which was more than 16 times higher than bulk g-C 3 N 4 with the same loading amount of Pt as cocatalyst. Due to its effective separation of photogenerated carriers and prolonged lifetime, more photoexcited electrons with high reduction ability could contribute to the production of H 2 . Possible formation mechanism of 2D-2D WO 3 /g-C 3 N 4 nanosheets via scCO 2 in the reverse microemulsion system by the one-pot method has been proposed. This work provides an efficient and green strategy to synthesize 2D-2D heterojunction for the utilization in solar-to-fuel conversion.
研究领域:
材料科学
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能源科学
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DOI
PubMed
高影响因子
Environmental Science-Nano
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2019
·Vol. 6
·期 9
·2850-2862
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IF 7.704
Xiaoyu Bai,Yi Li,Liangbo Xie,Xiaohui Liu,Sihui Zhan,Wenping Hu
Antibiotics accumulate because of their extensive use and difficult degradation, which can lead to the formation of novel antibiotic resistant genes and bacteria, which can cause damage to human health and the ecological environment. Here, we designed a novel photo-electro-Fenton-like (PEF-like) system with bifunctional Z-scheme WO3/g-C3N4 for accelerated decomposition and enhanced mineralization of stubborn ciprofloxacin (CIP). This PEF-like system, accompanied by visible light activation, with the optimal WO3/g-C3N4 (1 : 6) composite exhibited outstanding removal efficiency of CIP compared with a single photocatalysis system and electro-Fenton-like (EF-like) system, and the elimination rate reached 100% within 2 h under visible light irradiation. The WO3/g-C3N4 (1 : 6) composite displayed the strongest visible light absorption, the weakest recombination of electron–hole pairs, the highest photocurrent response and the lowest electrochemical impedance compared with pristine WO3 and g-C3N4. Significantly, WO3/g-C3N4 (1 : 6) played a dual role in the PEF-like system which could not only produce ˙OH, ˙O2− and h+ during photocatalysis, but could also generate ˙OH through the reactions of W5+ and photoexcited electrons of g-C3N4 for the decomposition of H2O2. It was worth noting that this bifunctional PEF-like catalyst with photoelectric synergy could replace Fe2+ in a conventional electro-Fenton reaction and the pH range was broadened while still maintaining efficient degradation efficiency in the range of 2–9. The PEF-like system maintained a high elimination rate of CIP after five consecutive runs which revealed that it possessed prominent stability and feasibility.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Tingting Xiao,Zheng Tang,Yong Yang,Lanqin Tang,Yong Zhou,Zhigang Zou
Elegant Z-scheme WO 3 /g-C 3 N 4 composite hollow microspheres (CHMs) were constructed through precisely controlled in situ hydrolysis and a polymerization process consecutively. The formation of intact and well-defined hollow microspheres can be realized through optimizing the ratio of precursors for WO 3 and g-C 3 N 4 . The shell of these hollow microspheres consist of well-distributed WO 3 and g-C 3 N 4 nanoparticles, and excellent heterojunctions with numerous interfaces and highly exposed oxidation-reduction active sites have thus been built. By virtue of this special architecture, more incident photons are expected to be trapped in the hollow cavities, which contribute to more electrons and holes available for photocatalytic reactions. Moreover, these photoinduced hole-electron pairs could be effectively separated, and the lifetime of charge carriers reaches 2.23 ns, which is obviously prolonged compared with the WO 3 . WO 3 /g-C 3 N 4 CHMs as an optimized Z-scheme system retains the original oxidation and reduction abilities for the components without change of the oxidation and reduction potential. Combined with the long survival time of holes and electrons, this photocatalyst showed enhanced degradation rates towards tetracycline hydrochloride (TC-HCl) and ceftiofur sodium (CFS).
研究领域:
材料科学
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环境科学
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光催化
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
·
IF 2.891
Huili Zhang,Zhiyuan Feng,Yekun Zhu,Ying Wu,Tinghua Wu
WO 3 /g-C 3 N 4 (graphitic carbon nitride) composite was prepared via a directly calcination method with ammonium tungstate hydrate and melamine as raw materials, and applied in the photocatalytic oxidation of 5-hydroxymethylfurfural (5-HMF) to 2,5-diformylfuran (DFF) for the first time. Its physicochemical properties were characterized by HR(TEM), XRD, FT-IR, XP, UV-vis, PL, PC and EIS methods. The results revealed that the doping of WO 3 into g-C 3 N 4 can reduce the possibility of charge recombination and thus enhancing the photocatalytic activity. The impact factor, such as incident wavelength, reaction time, and solvent were also studied on the photocatalytic behavior. 4.7%WO 3 /g-C 3 N 4 composite catalyst exhibits the highest 5-HMF conversion of 27.4% with DFF selectivity of 87.2% under the irradiation of visible-light (>400 nm). As the active species, O 2 − and h + plays an important role to convert 5-HMF to DFF. Finally, the Z-scheme mechanism and reaction route were proposed by combining the photocatalytic performance with the active oxygen species research of the WO 3 /g-C 3 N 4 catalyst.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2014
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IF 2.129
Shifu Chen,Yingfei Hu,Xiaoliang Jiang,Sugang Meng,Xianliang Fu
Developing a high-efficiency visible light photocatalyst is always a research hotspot in photocatalytic field. In this study, a novel Z-scheme photocatalyst WO 3 /g-C 3 N 4 with high efficient visible light photocatalytic activity was prepared via ball milling and heat treatment methods. The photocatalyst was characterized by X-ray powder diffraction (XRD), UV–vis diffuse reflection spectroscopy (DRS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electron spin resonance (ESR), and photoluminescence (PL). The photocatalytic activity was evaluated by degradation of methylene blue (MB) and fuchsin (BF) under visible light illumination. The results showed that composite WO 3 /g-C 3 N 4 exhibits a much higher photocatalytic activity than a single g-C 3 N 4 . The rate constants of photocatalytic degradation of MB and BF for WO 3 (5.0 wt.%)/g-C 3 N 4 are 4.77 times and 3.84 times that of pure g-C 3 N 4 . The characterization results by physical and chemical methods demonstrated that composite WO 3 /g-C 3 N 4 is a typical Z-scheme photocatalyst. The enhancement of the photocatalytic activity may be attributed to the formation of the Z-scheme system between g-C 3 N 4 and WO 3 , which could result in the photoexcited electrons of g-C 3 N 4 and photoexcited holes of WO 3 participating in oxidation and reduction reactions, respectively.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
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2022
·Vol. 55
·期 43
·434005
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IF 3.409
Yang Li,Yue Lu,Xiaofang Jia,Zhaoyu Ma,Junying Zhang
Graphitic carbon nitride (g-C3N4) is a photocatalytic semiconductor with great potential for application, whereas, its photocatalytic activity is limited by the high re-combination rate of photo-generated electrons and holes. Here, we load two-dimensional (2D) WO3 nanosheets on the surface of one-dimensional (1D) g-C3N4 porous nanotubes to form a Z-scheme heterojunction. The built-in electric field at the interface of the heterojunction is conducive to promoting electrons transfer from the conduction band of WO3 to the valence band of g-C3N4 and therein combine with the holes. This inhibits electron–hole re-combination in g-C3N4 and WO3, and thus retains the high redox potential of the photo-generated charge-carriers. Therefore, the 2D/1D WO3/g-C3N4 heterojunction shows excellent photocatalytic hydrogen production and Rhodamine B degradation activities. Under simulated sunlight, photocatalytic hydrogen production rate of the WO3/g-C3N4 heterojunction reaches 7.78 mmol g−1 h−1, 2.7 times that of the single g-C3N4 porous nanotubes.
研究领域:
材料科学
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光催化
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环境科学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2018
·
IF 4.439
Jiayi Chen,Xinyan Xiao,Yi Wang,Zhihao Ye
A novel Ag nanoparticles (NPs) decorated WO 3 nanoplates/g-C 3 N 4 (CN) nanosheets 2D/2D heterostructure was successfully synthesized by a solvent evaporation and in situ calcination method. The as-prepared WO 3 /Ag/CN ternary composite exhibited remarkably enhanced photocatalytic activity towards rhodamine B (RhB) and tetracycline (TC) degradation compared with WO 3 , CN, Ag/WO 3 , Ag/CN and WO 3 /CN under visible light irradiation. The enhanced photocatalytic activity could be attributed to the efficient separation of photogenerated charge carriers, the strong redox ability and enhancement of visible-light absorption derived from the construction of Z-scheme 2D/2D heterostructure. Ag NPs not only possess the surface plasmon resonance (SPR) effect, but also act as an electron mediator in Z-scheme heterostructure. The UV–vis absorption spectra analysis indicated that the loading of Ag NPs can enhance the visible-light adsorption. And the decreased photoluminescence and the increased photocurrent demonstrated the high separation rate of photoinduced charge carriers owing to the successful heterojunction construction. Furthermore, the possible degradation pathways of RhB and TC were proposed according to HPLC-MS analysis. The results of radical trapping experiments indicated that O 2 − and OH were the primary active species during the photocatalytic degradation process.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ACS Sensors
·
2026
·
IF 10.9
Zhang Ziqiang,Yang Ruiming,Zhao Linfeng,Wang Jiabao,Wang Zhipeng,Yang Bowen,Zhang Yanlin,Zhang Yeguang,Fang Fang,Wang Peng,Li Feihu,Zhan Zili
Developing gas sensors that achieve high sensitivity, a low detection limit, and superior selectivity continues to be a critical challenge for the detection of acetone in exhaled breath. Metal oxide semiconductors (MOS) are extensively utilized in chemiresistive gas sensors, largely because of their distinguished gas sensing performance and tunable physicochemical properties. However, unmodified MOS nanostructures are prone to aggregation and lack an effective mechanism for efficient charge separation, thus exhibiting the features of limited specific surface area, low porosity, and sluggish charge migration rate, which deteriorates gas sensing performance. In this study, we employed the impregnation method and sacrificial template method to prepare a three-dimensional inverse opal (3DIO) WO 3 composite loaded with graphitic carbon nitride (g-C 3 N 4 ). This composite shows outstanding acetone sensing capability. Specifically, it achieves a response of 7.33 at 10 ppm, a detection limit of 65 ppb, favorable selectivity, and reliable stability. Such superior sensing behavior benefits greatly from the synergistic effect of abundant active sites endowed by its unique 3D ordered macroporous structure and accelerated interfacial charge transfer from the n-n heterojunction formed between WO 3 and g-C 3 N 4 . Consequently, the construction of WO 3 /g-C 3 N 4 composites with a three-dimensional ordered macroporous architecture offers a promising strategy for real-time and accurate acetone detection, as well as for the development of portable breath analysis sensors.
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DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Gongduan Fan,Rongsheng Ning,Zhongsen Yan,Jing Luo,Banghao Du,Jiajun Zhan,Lingshan Liu,Jin Zhang
Antibiotic contamination is increasing scrutinized recently. In this work, the Ag−AgCl/WO 3 /g-C 3 N 4 (AWC) nanocomposites were successfully synthesized using a two-step process involving electrostatic self-assembly and in-situ deposition for trimethoprim (TMP) degradation. The as-prepared photocatalysts were investigated and characterized by XRD, FTIR, XPS, TGA, SEM, TEM , UV–vis, PL and EIS. The experimental results indicated that 99.9% of TMP (4 mg/L) was degraded within 60 min when the concentration of AWC was 0.5 g/L. Reactive species scavenging experiments and electron spin resonance (ESR) experiments illustrated that superoxide radical (•O 2 − ) and photogenerated holes (h + ) were the main active species. The functional theory calculation and identification of intermediates via HPLC-MS revealed the possible degradation pathways of TMP. A double photoelectron-transfer mechanism in AWC photocatalyst was proposed. Five cycling photocatalytic tests and reactions under different solution matrix effects further supported that the AWC was a promising photocatalyst for the removal of TMP from the aquatic environment.
研究领域:
环境科学
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材料科学
·
生物学
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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）