MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
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2019
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IF 2.722
Manoj Pudukudy,Qingming Jia,Hong Wang,Shaoyun Shan,Ramesh Rajendran
The influence of synthesis conditions on the formation of α and β polymorphs of AgVO 3 , their crystalline, structural, textual and optical properties and photocatalytic activity for dye degradation was investigated. The as-prepared polymorphs were characterized by using XRD , FTIR , EDX , SEM, TEM, HRTEM , XPS , BET and UV–vis. analyses. The analytical results indicated that a metastable α-AgVO 3 was formed in the precipitation method, whereas it was irreversibly converted into thermodynamically stable β-AgVO 3 by a hydrothermal method at 120 °C. The hydrothermal treatment was found to be decisive for the formation of β-form with high crystallinity and phase purity. The increase of hydrothermal temperature to 150 °C and 180 °C could not contributed to a significant variation in the crystalline, structural, textural and optical properties of the β-AgVO 3 . Moreover, a plausible mechanism for the phase transformation was briefly discussed. A combination of the needle and rod-like nanostructures of α form was completely changed to nanorods in β form after hydrothermal treatment. The optical band gap of α and β AgVO 3 polymorphs was found to be 1.91 eV and 1.98 eV respectively. The photocatalytic activity of the silver vanadates for the degradation of Rhodamine B indicated that β-AgVO 3 nanorods were better than α-AgVO 3 polymorphs. This could be attributed to the significant effects of its stable crystalline structure rather than specific surface area . Moreover, due to the reduced grain boundaries in β-form, their electron-hole recombination rate was lowed compared to α form. The degradation efficiency reached to 56% within 180 min under visible light irradiation. However, the increase of hydrothermal temperature does not have a significant effect in the photocatalytic activity. Moreover, the β-AgVO 3 nanorods were successfully reused for five cycles of photodegradation .
研究领域:
材料科学
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无机化学
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纳米科技
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光催化
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功能材料
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
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2023
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IF 9.5
Yongfu Kang,Junwen Cai,Linfeng Zhang,Hong-Wei Wang,Rui-Bo Jin,Yoann de Rancourt de Mimérand,Xiaoyun Jin,Jia Guo
Herein, we explore the potential of innovative manufacturing techniques based on green chemistry principles, for the fabrication of convenient, performant, and stable supported photocatalysts to be used for water depollution. After giving some insight into the use of fractal geometry for the fabrication of tunable polymer supports for photocatalysts, we investigated the use of liquid crystal display (LCD) 3D printing to generate the fractal resin substrates to be used for the immobilization of semiconductor photocatalysts. Notably, confocal laser imaging was used as a first attempt for assessing the surface area of the fractal substrate. Immobilization methods based on cold plasma discharge (CPD) were employed to modify the surface of the polymer substrates and permanently anchor three different phases, namely, nickel-based metal–organic framework (Ni-MOF), BiOI, and AgVO3, in a hierarchical configuration. Herein, for the first time, we developed a plasma-initiated condensed in situ complexation-assisted precipitation (c-ISCAP) method that allowed 2D Ni-MOF to be synthesized directly onto the surface of a polymer substrate, in a single step. Not only this MOF coating was found to be strongly bound to the surface of the polymer substrate but also very uniform and fully functional, even when other inorganic phases were immobilized on the top of this layer. This chemical approach opens the way for the fabrication of hybrid materials with complex polymer substrates and MOF coatings that could be used in a range of possible applications, for instance as chemical sensors, electrodes, adsorbents, optical devices, etc. Our hybrid photocatalysts were tested via photodegradation of Rhodamine B (RhB) dye upon visible light activation, with recycling runs to assess their durability. It was found that the hierarchical heterojunction Ni-MOF/BiOI/AgVO3 showed an outstanding ability for the removal of RhB dye, owing to the activity of the Ni-MOF layer in terms of charge transfer, and also partly because of its adsorbing potential. The three photoactive phases demonstrated a strong synergistic effect through coupling. However, more importantly, our findings show that their immobilization itself, regardless of the method used, significantly modified their optoelectronic properties, hence most likely changing the overall mechanism of charge transfer in the heterojunction. The Ni-MOF phase, notably, was found to display a reduced bandgap when obtained by c-ISCAP, which contributed to enhance its activation by visible light irradiation. Finally, it was established that the fractal geometry had a significant impact on the efficiency of the supported catalysts, probably thanks to an increased immobilization ratio of photocatalyst mostly, owing to the larger surface area available.
研究领域:
材料科学
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环境工程
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化学工程
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纳米技术
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绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Analytical Methods
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2012
·Vol. 4
·期 11
·3785-3791
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IF 1.547
Essy K. Fodjo,Sara Riaz,Da-Wei Li,Lu-Lu Qu,Niamien P. Marius,Trokourey Albert,Yi-Tao Long
A Surface Enhanced Raman Scattering (SERS) substrate based on Ag/β-AgVO3 nanobelts deposited on copper foil (Cu@Ag/β-AgVO3) was used for the detection of carbamate pesticides: carbofuran, carbaryl, isoprocarb and propoxur. Cu@Ag/β-AgVO3 has shown an excellent SERS activity for carbamate pesticides compared to silver nanoparticles (AgNPs). Under optimized conditions, detection limits of 2.5 pM, 10 pM, 50 pM and 75 pM were obtained for carbaryl, carbofuran, isoprocarb and propoxur respectively, suggesting that Cu@Ag/β-AgVO3 is a good candidate for use as a SERS substrate for the trace level detection of these pesticides.
研究领域:
分析化学
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环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xiaodong Li,Lina Zhang,Yuxin Tian,Xiaotong Yin,Shi Su,Boxin Li,Wei Zhang
Composite photocatalyst have garnered considerable attention in the field of environmental remediation. In this study, we synthesized a one-dimensional (1D) core/shell AgVO 3 @SnIn 4 S 8 (AS) heterojunction photocatalyst by in situ growing SnIn 4 S 8 nanosheets on AgVO 3 nanorods utilizing a straightforward solvothermal approach. The resultant AS composite demonstrates exceptional photocatalytic efficiency in both degrading methyl orange (MO) and reducing Cr(VI) pollutants. The optimized AS-0.1 heterostructure is particularly noteworthy, achieving almost complete MO degradation (99.7 %) within just 15 min and effectively reducing Cr(VI) 99.4 % within 75 min. The reaction rate constant k for MO degradation by the AS-0.1 sample is 0.3654 min⁻¹ , which is 8.2 times higher than that of SnIn₄S₈ (0.0446 min⁻¹) and 609 times greater than that of AgVO₃ (0.0006 min⁻¹). Similarly, the degradation constant k for Cr(VI) reduction by AS-0.1 is 0.0656 min⁻¹ , surpassing that of SnIn₄S₈ by 5.2 times (0.0127 min⁻¹) and AgVO₃ (0.0003 min⁻¹) by 218.7 times. This significant enhancement in photocatalytic activity is primarily attributed to the increased number of active sites and the efficient S-scheme charge transfer mechanism, which is facilitated by the built-in electric field within the AS heterostructure. The S-scheme mechanism facilitates the efficient migration of photogenerated charge, and endows photoexcited electrons and holes with high redox capacity, thereby accelerating the photocatalytic reactions. Furthermore, the recovered samples retain their photocatalytic degradation performance after five consecutive experimental cycles, suggesting their excellent durability. This study is expected to motivate the rational design and fabrication of efficient composite photocatalysts, offering innovative solutions to water pollution challenges.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2023
·
IF 8.9
Yangbin Liu,Nian Liu,Minghua Lin,Caifeng Huang,Zhijun Lei,Hongshuai Cao,Fugang Qi,Xiaoping Ouyang,Yun Zhou
The traditional semiconductor photocatalysts for solving the related environmental aggravation are often challenged by the recombination of photogenerated carriers. Designing an S-scheme heterojunction photocatalyst is one of the keys to tackling its practical application problems. This paper reports an S-scheme AgVO 3 /Ag 2 S heterojunction photocatalyst constructed via a straightforward hydrothermal approach that exhibits outstanding photocatalytic degradation performances to the organic dye Rhodamine B (RhB) and antibiotic Tetracycline hydrochloride (TC-HCl) driven by visible light. The results show that AgVO 3 /Ag 2 S heterojunction with a molar ratio of 6:1 (V6S) possesses the highest photocatalytic performances, 99% of RhB can be almost degraded by 0.1 g/L V6S within 25 min light illumination, and about 72% of TC-HCl can be photodegraded with the act of 0.3 g/L V6S under 120 min light irradiation. Meanwhile, the AgVO 3 /Ag 2 S system exhibits superior stability and maintains high photocatalytic activity after 5 repeated tests. Moreover, the EPR measurement and radical capture test identify that superoxide radicals and hydroxyl radicals mainly contribute to the photodegradation process. The present work demonstrates that constructing an S-scheme heterojunction can effectively inhibit the recombination of carriers, providing insights into the fabrication of applied photocatalysts for practical wastewater purification treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Advanced Ceramics
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2022
·Vol. 11
·期 2
·308-320
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IF 11.534
Wu Jian,Li Liangyu,Li Xing-ao,Min Xin,Xing Yan
Silver vanadates are promising visible-light-responded photocatalysts with suitable bandgap for solar absorption. However, the easy recombination of photogenerated carriers limits their performance. To overcome this obstacle, a novel 2D graphene oxide (GO) modified α-AgVO 3 nanorods (GO/α-AgVO 3 ) photocatalyst was designed herein to improve the separation of photocarriers. The GO/α-AgVO 3 was fabricated through a facile in-situ coprecipitation method at room temperature. It was found that the as-prepared 0.5 wt% GO/α-AgVO 3 exhibited the most excellent performance for rhodamine B (RhB) decomposition, with an apparent reaction rate constant 18 times higher than that of pure α-AgVO 3 under visible-light irradiation. In light of the first-principles calculations and the hetero junction analysis, the mechanism underpinned the enhanced photocatalytic performance was proposed. The enhanced photocatalytic performance was ascribed to the appropriate bandgap of α-AgVO 3 nanorods for visible-light response and efficient separation of photocarriers through GO nanosheets. This work demonstrates the feasibility of overcoming the easy recombination of photogenerated carriers and provides a valuable GO/α-AgVO 3 photocatalyst for pollutant degradation.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
DOI
高影响因子
Materials
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2025
·Vol. 18
·期 20
·4705
·
IF 3.2
Weijie Hua,Huixin Yuan,Songhua Huang
This research successfully synthesized a novel n-n heterojunction Bi2O2CO3/AgVO3nanocomposite photocatalyst via the in situ chemical deposition process. Characterization results strongly confirmed the formation of a tight heterojunction at the Bi2O2CO3/AgVO3interface. The nanocomposite exhibited characteristic XRD peaks and FT-IR vibrational modes of both Bi2O2CO3and AgVO3simultaneously. Electron microscopy images revealed AgVO3nanorods tightly and uniformly loaded onto the surface of Bi2O2CO3nanosheets. Compared to the single-component Bi2O2CO3, the composite photocatalyst exhibited a red shift in its optical absorption edge to the visible region (515 nm) and a decrease in bandgap energy to 2.382 eV. Photoluminescence (PL) spectra demonstrated the lowest fluorescence intensity for the nanocomposite, indicating that the recombination of photogenerated electron–hole pairs was suppressed. After 90 min of visible-light irradiation, the degradation efficiency of Bi2O2CO3/AgVO3toward methylene blue (MB) reached up to 99.55%, with photodegradation rates 2.51 and 2.79 times higher than those of Bi2O2CO3and AgVO3, respectively. Furthermore, the nanocomposite exhibited excellent cycling stability and reusability. MB degradation was gradually enhanced with increasing the photocatalyst dosage and decreasing initial MB concentration. Radical trapping experiments and absorption spectroscopy of the MB solution revealed that reactive species h+and ·O2−could destroy and decompose the chromophore groups of MB molecules effectively. The possible mechanism for enhancing photocatalytic performance was suggested, elucidating the crucial roles of charge carrier transfer and active species generation.
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Xueyu Wei,Saraschandra Naraginti,Xiaofan Yang,Xiaoping Xu,Jiyuan Li,Meiqing Zhu,Pengli Chen,Pei Jiang
The simultaneous degradation of organic pollutants and generation of value-added compounds like ammonia and hydrogen energy has recently gained considerable attention in photocatalysis . The present study deals with successful preparation of novel AgVO 3 nanowire@rGO-tetrahedral Ag 3 PO 4 (110) (AGA) heterojunction and utilized for enhanced generation of NH 3 and H 2 from N-containing antibiotic sulfamethoxazole (SMX) under visible light. The prepared catalyst was well characterized by XRD , SEM, TEM and XPS to confirm the formation of heterojunction . The results indicated that the composite exhibited 546.0 μmol g −1 of hydrogen evolution rate, which is approximately 3.6 (153.6 μmol g −1 ) and 5.1 (108.7 μmol g −1 ) times higher than the pure AgVO 3 and Ag 3 PO 4 respectively after 6 h. Similarly, 38.3 mg L −1 g −1 of NH 3 generation was observed during 6 h of SMX degradation, which is about 1.9 and 2.8 times higher than the pure AgVO 3 (20.1 mg L −1 g −1 ) and Ag 3 PO 4 (13.7 mg L −1 g −1 ) respectively. The formation of heterojunction between AgVO 3 and Ag 3 PO 4 not only promotes the transfer of electron but also prevents the recombination which eventually enhances the catalytic conversion of N-element to NH 3 and for H 2 generation during water splitting. Furthermore, the plausible degradation pathway in SMX was proposed and the results revealed that the SMX was mineralized by the composite further converted to NH 3 and generates H 2 during the degradation process . Thus, our study provides new insights into novel photocatalytic treatment methodologies for simultaneous degradation of SMX to produce NH 3 and H 2 as value-added compounds from antibiotic wastewaters during water treatment process.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Hai Yu,Miao Zhang,Jianguo Lv,Yanfen Wang,Lei Yang,Yanmei Liu,Qian Gao,Gang He,Zhaoqi Sun
In this study, we fabricated TiO 2 nanorod arrays (TiO 2 ), which were decorated with AgVO 3 quantum dots (QDs) on and a layer of V 2 O 5 film, forming a heterojunction material for removal pollutants and photoelectrochemical (PEC) water splitting. The AgVO 3 /V 2 O 5 -TiO 2 nanorod arrays (AgVO 3 /V 2 O 5 -TiO 2 ) synthesized by the secondary hydrothermal method were grown on conductive glass to form one-dimensional (1D) nanorod and p-n junction structures. Through experimental characterisation and testing, optical, morphological photocatalysis and PEC characteristics of the materials were measured and studied. The TiO 2 modified with AgVO 3 and V 2 O 5 can significantly improve the visible light optical absorption, the reduce the electron-hole pair binding rate and shorten the band gap (3.07–1.41 eV) of TiO 2 . The resulting photocurrent density (116 uA/cm 2 ) and photodegradation efficiency (rate constant, k = 0.025 min −1 ) of AgVO 3 /V 2 O 5 -TiO 2 are approximately 20 (6 uA/cm 2 ) and 5 times (0.005 min −1 ) higher than those of bare TiO 2 , respectively. The AgVO 3 /V 2 O 5 -TiO 2 achieved a current density of 10 mA at an overpotential of 246.2 mV and exhibited excellent oxygen evolution reaction (OER) performance. The systematic PEC experiments concluded that the optimized of the TiO 2 interface by AgVO 3 and V 2 O 5 could promote the separation and transport of charge carriers.
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Zhixin Liu,Yongdi Liu,Xianbo Sun,Haodong Ji,Wen Liu,Zhengqing Cai
A novel Z-scheme Ag/AgVO 3 /carbon-rich g-C 3 N 4 heterojunction with excellent solar-light-driven photocatalytic activity was constructed via a facile hydrothermal-calcining method. The Ag/AgVO 3 /carbon-rich g-C 3 N 4 composites displayed superior performance for the photocatalytic degradation of sulfamethiadiazole (SFZ) under solar irradiation. The optimal composite with a 10 wt% Ag/AgVO 3 content showed the highest photocatalytic activity, its degradation rate constant ( k ) for SFZ degradation was ∼13 and 30 times than that of carbon-rich g-C 3 N 4 (CCN) and Ag/AgVO 3 , respectively. Furthermore, •O 2 – was identified as the most crucial reactive species in the Z-scheme photocatalysis system. The greatly improved photocatalytic activities are derived from the built-in electric field (BIEF) of CCN and efficient Z-scheme charge transfer with Ag nanoparticles as charge transmission-bridge. The possible photocatalytic degradation mechanism and pathway over Ag/AgVO 3 /carbon-rich g-C 3 N 4 were proposed based on LC-MS analysis and density functional theory (DFT) calculation, and the toxicity of intermediates was evaluated by Quantitative structure–activity relationship (QSAR) based prediction. In summary, this work provides new insight into constructing highly efficient Z-scheme photocatalyst, which is promising for implementation in surface water remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Dong Lin,Minghuan Gao,Lisha You,Yue Li,Zhiying Li,Linna Guo,Tiesheng Li,Minghua Liu
A series of novel Ag/AgVO 3 /WO 3 homojunction/heterojunction nanomaterials (denoted as AVW-x , x = 10, 20, 30, 40) were designed and synthesized by a simple coprecipitation method. Compared with the other materials, AVW-10 exhibited a unique photochemical performance with a wider absorption range, higher surface area and improved separation of charge carriers. The photocatalytic activity of AVW-10 for degrading RhB was investigated, and the apparent rate constant was 3.11 and 57.2 times higher than those of pure AgVO 3 and WO 3 . Interestingly, the photostability of the recycled catalyst could be significantly enhanced by adding a small amount of benzoquinone (BQ) due to the interaction between BQ and the catalyst, indicating that this addition might be an efficient way to enhance the photoactivity by promoting the separation of photoinduced carriers. Furthermore, trapping experiments were designed and systematically explored, and •O 2 − was identified as the main active species causing photocatalytic degradation of RhB. A new kind of type Ӏ plus Z-scheme mechanism was also proposed.
研究领域:
材料科学
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环境科学
·
光催化技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）