CHEMICAL PHYSICS LETTERS
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2022
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IF 2.719
Xinhe Liu,Yong Kang,Yi Wang
In this work, novel visible-light responsive β-Bi 2 O 3 /Ag 2 WO 4 p-n heterojunction photocatalysts were prepared by a simple in situ deposition method and characterized using XRD, FT-IR, SEM, TEM, XPS, UV–vis and PL. The uniform deposition of Ag 2 WO 4 particles on β-Bi 2 O 3 flakes to form heterojunctions, exhibited excellent photocatalytic activity for the degradation of methylene blue (MB) under visible light in 30 min. Compared with pure β-Bi 2 O 3 and Ag 2 WO 4 samples, the kinetic reaction rate constant of MB degradation by β-Bi 2 O 3 /Ag 2 WO 4 was 48.47 times higher than that of β-Bi 2 O 3 , and the degradation rate was as high as 98.8% with good cycling stability.
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
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Tengfei Li,Haoran Wei,Hanzhong Jia,Tianjiao Xia,Xuetao Guo,Tiecheng Wang,Lingyan Zhu
The application of Ag3PO4 as a commonly used photocatalyst is limited by its high recombination potency and electron–hole pairs with weak redox potential. It is significant to enhance the photocatalytic activity of Ag3PO4 by coupling with a wide band gap semiconductor. In this study, Ag2WO4 was selected to promote the photocatalysis of Ag3PO4 giving that it has wide band gap energy and strong redox potential. A facile chemical precipitation method was applied to assemble Ag2WO4 nanoparticles on the surface of Ag3PO4 to form an Ag2WO4/Ag3PO4 heterojunction. The Ag2WO4/Ag3PO4 heterojunction containing 7.5% molar mass of WO42– (7.5W) displayed the most superior photocatalytic efficiency under simulated solar light irradiation: 93% of bisphenol A was degraded just within 10 min and above 75% was mineralized within 30 min. The degradation reaction rate constant was 3 times higher than that of the pure Ag3PO4. The excited high-level-energy electrons on the conduction band of Ag3PO4 would transfer thermodynamically to the conduction band of Ag2WO4, and the generated valence band holes on Ag2WO4 easily shifted to the low-energy valence band of Ag3PO4, resulting in high separation of electron–hole pairs. The photogenerated holes and superoxide radical species played predominant roles in the reaction system.
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
Journal of Science-Advanced Materials and Devices
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2023
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IF 8
Shuai Fu,Yanqiang Du,Junhong Bie,Zhiquan Huang,Hai Hu,Qiang Huang,Huijie Zhu,Wei Yuan,Leicheng Li,Bo Liu
Z-scheme Ag 2 WO 4 /BiOBr heterojunction with rich oxygen vacancies was successfully synthesized by the simplest hydrothermal method, which was systematically characterized in the structural, optical and electronic properties. The photocatalytic applications of Z-scheme Ag 2 WO 4 /BiOBr heterostructure with different weight percentages of Ag 2 WO 4 were studied. The optimized Ag 2 WO 4 (20%)/BiOBr heterostructure exhibited superior photodegradation efficiencies (98%) towards Lanasol Red 5 B (LR5B), which was 4.67- and 3.38-fold higher than pristine BiOBr and Ag 2 WO 4 , respectively. The principal reason for the elevated photocatalytic property of Ag 2 WO 4 /BiOBr was ascribed to the formation of oxygen vacancies and intimate Z-scheme heterostructure between Ag 2 WO 4 and BiOBr, improving the light trapping capability and facilitating separation of photo-induced charge. Moreover, the removal efficiencies of Ag 2 WO 4 /BiOBr heterostructure towards TC (tetracycline), CIP (ciprofloxacin) and RhB (rhodamine B) were 74%, 23%, and 13%, respectively. The simultaneous degradation experiment confirmed the competitiveness between LR5B and CIP for active species, leading to the inferior degradation efficiency for LR5B, along with the experimental factor towards LR5B was researched. The probable Z-scheme mechanism and the significant role of hydroxyl radical and superoxide radicals were demonstrated by the radical capture experiment and electron spin resonance (ESR). The Z-scheme mechanism has resulted in prominent improvement in charge separation, along with higher redox properties, which were responsible for the excellent photocatalytic activity.
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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2019
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IF 3.261
Yi Wang,Xinyan Xiao,Jiayi Chen,Xingye Zeng
A novel AgBr and GO co-decorated g-C 3 N 4 /Ag 2 WO 4 (g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO) composite was successfully fabricated by hexadecyl trimethyl ammonium bromide (CTAB)-assisted co-deposition of AgBr and GO onto g-C 3 N 4 /Ag 2 WO 4 composite. The as-prepared composites were characterized by XRD, SEM, TEM, FT-IR, BET, XPS, UV–vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), and electrochemistry impedance spectroscopy (EIS). The photocatalytic efficiency for tetracycline (TC) degradation over the as-prepared g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO composite is 91.64% within 100 min simulated sunlight irradiation, which is nearly 2.59 and 5.25-folds greater than those of the g-C 3 N 4 /Ag 2 WO 4 and g-C 3 N 4 samples. The enhancement of photocatalytic performance is mainly ascribed to the introduction of AgBr and GO, which serve as photosensitizer and electron acceptor, respectively, confirmed by the results of DRS, PL, and EIS. The active species trapping experiments confirmed that O 2 − and h + are the dominant reactive species responsible for TC degradation. Furthermore, a reasonable n-n heterojunction-based photocatalytic mechanism for the g-C 3 N 4 /Ag 2 WO 4 /AgBr/GO composite was proposed.
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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2021
·Vol. 32
·期 2
·2061-2074
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IF 2.478
Wang Xule,Song Jimei,Lu Yun,Zhu Wanrong,Hu Gang
In this work, a series of Z-scheme Ag/Ag 2 WO 4 /g-C 3 N 4 (AAC) photocatalysts were successfully constructed by the deposition–precipitation method at room temperature. The phase, structure, morphology and optical property of the as-prepared photocatalysts were well characterized. Interestingly, all AAC exhibited prominent photocatalytic activity for Rhodamine B (RhB) degradation under visible light illumination. Especially, AAC-3 possessed the higher RhB degradation rate ( k = 0.1855 min −1 ). More remarkably, when H 2 O 2 (1 mL 0.0977 mol/L) was dissolved into reaction system, the degradation rate of RhB was further improved ( k = 0.7899 min −1 ), which could be mainly attributed to the high separation rate of photogenic carriers and more active species. Meanwhile, a feasible photocatalytic reaction mechanism was proposed and discussed in detail.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2024
·Vol. 35
·期 27
·1-14
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IF 2.8
Kavitha T.,Renukadevi S.,Veerasamy R.
The hydrothermal approach was used to synthesise a composite photocatalyst of Ag 2 WO 4 /g-C 3 N 4 . This photocatalyst proved effective in preventing Escherichia coli ( E. coli ) when exposed to visible light. Imaging microscopy, transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), N 2 adsorption–desorption analysis, UV–Vis diffuse reflectance spectra (DRS), and photoluminescence (PL) were among the many methods used to comprehensively characterize the photocatalysts’ physicochemical characteristics. In comparison to pure g-C 3 N 4 and Ag 2 WO 4 under visible light, the produced photocatalysts demonstrated significantly improved photocatalytic cleaning efficiency. In addition, under visible light irradiation for 60 min, a mixture of 5 percent Ag 2 WO 4 and 100 milligrammes of g-C 3 N 4 was able to entirely kill many live bacteria. The ideal mass ratio for this combination was 5 weight percent. By working in tandem, g-C 3 N 4 and Ag 2 WO 4 increase the separation rate of photogenerated electron–hole pairs and ensure that Ag 2 WO 4 particles are evenly distributed over the g-C 3 N 4 surface, leading to a high disinfection efficiency. These hybrids outperform pure g-C 3 N 4 in the visible range when it comes to the efficiency of hydrogen evolution (3761.1 µmol h −1 g −1 ). A higher degree of photocatalytic activity may be achieved in the composite Ag 2 WO 4 /g-C 3 N 4 photocatalyst through boosting the spacing of charge carriers produced by photons in the two photocatalysts.
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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高影响因子
Journal of Environmental Chemical Engineering
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2018
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IF 0
Qingyong Li,Jiacheng Yao,Muhammad Arif,Ting Huang,Xiaoheng Liu,Guorong Duan,Xujie Yang
In this work, we first successfully designed and fabricated the ternary plasmonic Ag/β-Ag 2 WO 4 /WO 3 photocatalysts with different contents of Ag/β-Ag 2 WO 4 particles in situ decorated on the surface of WO 3 nanoplates by a simple precipitation method at room temperature condition. The photocatalytic activity of as-prepared samples was investigated by degradation of rhodamine B (RhB), methylene blue (MB) and methyl orange (MO) under visible-light irradiation. It was found that the prepared 40 wt% Ag/β-Ag 2 WO 4 /WO 3 photocatalyst showed the highest photocatalytic RhB efficiency with 83.21 and 86.83 times higher than those of pure WO 3 and Ag/β-Ag 2 WO 4 samples, respectively. The highly enhanced photocatalytic performance was attributed to the Z-scheme mechanism in this ternary composites, in which Ag particles play a crucial role by the surface plasmon resonance (SPR) effect; meanwhile, Ag particles also can work as the charge transmission-bridge, giving rise to effectively restraining recombination of the photogenerated charge carriers. This novel ternary Ag/β-Ag 2 WO 4 /WO 3 nanostructures may provide an appropriate insight in the consideration as an ideal candidate in environmental remediation.
研究领域:
材料科学
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环境科学
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APPLIED ORGANOMETALLIC CHEMISTRY
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2018
·Vol. 33
·期 3
·e4683
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IF 3.581
Jiang Li,Xiaolu Zhu,Fengxian Qiu,Tao Zhang,Fengping Hu,Xiaoming Peng
Introducing plasmonic metals into semiconductor materials has been proven to be an attractive strategy for enhancing photocatalytic activity in the visible region. In this work, a novel and efficient Ag/Ag 2 WO 4 /g-C 3 N 4 (AACN) ternary plasmonic photocatalyst was successfully synthesized using a facile one-step in situ hydrothermal method. The composition, structure, morphology and optical absorption properties of AACN were investigated using X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and UV–visible diffuse reflectance spectroscopy, respectively. Photocatalytic performance of AACN was evaluated via rhodamine B and tetracycline degradation. The results indicated that AACN had excellent photocatalytic performance for rhodamine B degradation with a rate constant of 0.0125 min −1 , which was higher than those of Ag 2 WO 4 and Ag/Ag 2 WO 4 . Characterization and photocatalytic tests showed that the strong coupling effect between the Ag/Ag 2 WO 4 nanoparticles and the exfoliated ultrathin g-C 3 N 4 nanosheets was superior for visible-light responsivity and reduced the recombination rate of photogenerated electrons and holes. A proposed mechanism is also discussed according to the band energy structure and the experimental results.
研究领域:
材料科学
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环境科学
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2024
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IF 5.5
Zhixin Chen
Background Energy shortages and environmental pollution are two of the most immediate problems all over the world. Photocatalysis is expanding into energy and environmental applications. Methods In this study, novel visible-light-driven Ag 2 WO 4 /AgVO 3 composite photocatalysts were constructed via a one-pot, controllable, ligand-free and eco-friendly approach and analyzed using different techniques. Under visible light irradiation, photocatalytic behavior of type-II heterojunctions in the degradation of levofloxacin hydrochloride is investigated. Significant findings Various characterizations showed that Ag 2 WO 4 was successfully loaded onto the AgVO 3 surface, which improved the separation and transfer efficiency of the photogenerated charge carriers. Under optimal experimental conditions, the removal efficiency of levofloxacin reached 0.0194 min - 1 for the Ag 2 WO 4 /AgVO 3 composites with a 3 : 5 mass ratio (3-WV), which was 5.87 and 17.64 times that of pure AgVO 3 and Ag 2 WO 4 , respectively. The photocatalytic mechanism of typical type-II heterojunction was discussed. Furthermore, possible photodegradation pathway of levofloxacin was comprehensively determined by LC-MS analysis. This work will provide new motivation for the design and synthesis of simple preparation and highly efficient photocatalysts for environmental purification.
研究领域:
环境科学
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材料科学
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 99
·96861-96869
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IF 3.289
Lei Shi,Jinling Gou,Lin Liang,Fangxiao Wang,Jianmin Sun
A g-C3N4/Ag2WO4 composite photocatalyst was synthesized via a simple co-precipitation method at room temperature and was thoroughly characterized by X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, UV-visible diffuse reflectance spectroscopy and photoluminescence spectroscopy. The characterization results indicated that upon depositing Ag2WO4 onto the surface of g-C3N4 its morphology changed from primary rod-like particles to globular nanoparticles and its phase changed from α-type to β-type Ag2WO4. When the composite was used as the catalyst in the photodegradation of Rhodamine B, 40%-g-C3N4/Ag2WO4 exhibited the highest photocatalytic activity with its rate constant was about 10.8 times larger than that of pure g-C3N4 and 3.12 times larger than that of bare Ag2WO4. The enhanced photocatalytic activity can be attributed to the complementary potentials of the conduction bands and valence bands of g-C3N4 and Ag2WO4, which could not only realize the effective separation of photoinduced electron and hole pairs, but also retained the catalysts high stability and photocatalytic performance even after five recycles. Furthermore, a possible photocatalytic mechanism for the degradation of RhB over the g-C3N4/Ag2WO4 composite was proposed according to the results of active species quenching 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
Journal of Environmental Chemical Engineering
·
2022
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IF 7.968
Yue Sun,Zhenlong Han,Xi Zhang,Danna Qin,Guoning Chen,Xipu He
In this study, we have developed a magnetic MrGO/Ag 2 WO 4 composite to remove lomefloxacin (LOM) via the synergistic effect of adsorption and photocatalysis in water. After 20 min of dark reaction and 120 min of visible light reaction, the MrGO/Ag 2 WO 4 composite can remove 93.62% of LOM, and the removal effect is still 85.49% after four cycles, the maximum adsorption capacity is 117.93 mg/g. Compared with MrGO and MrGO/Ag 2 WO 4 separately, the ability of MrGO/Ag 2 WO 4 composite to remove LOM increased by 2.15 and 7.25 times. The e − , h + , •OH, and •O 2 − all play an essential role during degradation. Moreover, the high activity of MrGO/Ag 2 WO 4 composite material is attributed to the excellent adsorption performance and the formation of Z-scheme heterojunction , which effectively aggregates organic matter and inhibits the recombination of photogenerated carriers. Finally, the adsorption and photocatalytic mechanism of MrGO/Ag 2 WO 4 composite materials for LOM are discussed, the adsorption process of the LOM by MrGO/Ag 2 WO 4 composite is more suitable for the Langmuir isotherm adsorption model and may be more inclined to a monolayer system. The results suggest that MrGO/Ag 2 WO 4 holds a high potential of being an environmentally friendly and recyclable composite catalyst for LOM removal from water.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·4847-4857
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IF 1.941
Wang Hui,Zhang Jia-Rui,Wu Xiang-Feng,Wang Chao,Li Yan,Ci Li-Jie,Jia Yun-Ning,Chang Tian-Long,Liu Xu-Tao,Fu Yun-Xuan
Ag 2 WO 4 is a typically noble metal based photocatalyst with highly efficient photocatalytic activity. However, due to photocorrosion, the pristine Ag 2 WO 4 is prone to inactivation during illumination. Constructing composite photocatalyst may be a useful method to promote the stability of Ag 2 WO 4 . In this work, Ag 2 WO 4 /graphitic carbon nitride nanotubes (g-C 3 N 4 NTs) composite photocatalyst was prepared by adopting an in-situ composite strategy. The photocatalytic performance of the samples was discussed by the degradation of rhodamine B under visible light, and the catalytic mechanism was also analyzed. The characterization results show that the photocatalytic efficiency of the as-prepared Ag 2 WO 4 /g-C 3 N 4 NTs composite increases firstly and then decreases along with the increase of the Ag 2 WO 4 content. When the theoretical molar ratio of Ag 2 WO 4 :g-C 3 N 4 NTs reaches 3:2, the photocatalytic degradation efficiency achieves the optimal value, that is 92.4% within 20 min, which obviously exceeds 2.8% of pure Ag 2 WO 4 and 48.9% of pure g-C 3 N 4 NTs. Moreover, the separation and migration efficiency of photoelectron–hole pairs of the composites can be accelerated in comparison with pure samples. In addition, superoxide radicals and hydroxyl radicals play major roles in the photocatalytic degradation process.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
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