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Nguyen PH, Cao TM, Nguyen TT, Tong HD, Van Pham V. Photoelectrochemical water oxidation over TiO 2 nanotubes modified with MoS 2 and g-C 3N 4. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:1541-1550. [PMID: 36605609 PMCID: PMC9764855 DOI: 10.3762/bjnano.13.127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 11/25/2022] [Indexed: 06/17/2023]
Abstract
TiO2 nanotube arrays (TNAs) have been studied for photoelectrochemical (PEC) water splitting. However, there are two major barriers of TNAs, including a low photo-response and the fast charge carrier recombination in TNAs, leading to poor photocatalytic efficiency. Through a comparison of MoS2/TNAs and g-C3N4/TNAs, it was found that TNAs modified with MoS2 and g-C3N4 exhibited a current density of, respectively, 210.6 and 139.6 μA·cm-2 at an overpotential of 1.23 V vs RHE, which is 18.2 and 12 times higher than that of pure TNAs under the same conditions. The stability of the MoS2/TNAs heterojunction is higher than that of g-C3N4/TNAs.
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Affiliation(s)
- Phuong Hoang Nguyen
- HUTECH University, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City, 700000, Vietnam
| | - Thi Minh Cao
- HUTECH University, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City, 700000, Vietnam
| | - Tho Truong Nguyen
- HUTECH University, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City, 700000, Vietnam
| | - Hien Duy Tong
- Faculty of Engineering, Vietnamese-German University (VGU), Le Lai Street, Hoa Phu Ward, Thu Dau Mot City, Binh Duong Province, Vietnam
| | - Viet Van Pham
- HUTECH University, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City, 700000, Vietnam
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2
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Ding C, Guo J, Gan W, Chen P, Li Z, Yin Z, Qi S, Deng S, Zhang M, Sun Z. Ag nanoparticles decorated Z-scheme CoAl-LDH/TiO2 heterojunction photocatalyst for expeditious levofloxacin degradation and Cr(VI) reduction. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121480] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Meng M, Feng Y, Li C, Gan Z, Yuan H, Zhang H. Black 3D-TiO2 Nanotube Arrays on Ti Meshes for Boosted Photoelectrochemical Water Splitting. NANOMATERIALS 2022; 12:nano12091447. [PMID: 35564156 PMCID: PMC9104132 DOI: 10.3390/nano12091447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 04/14/2022] [Accepted: 04/21/2022] [Indexed: 11/16/2022]
Abstract
Black 3D-TiO2 nanotube arrays are successfully fabricated on the Ti meshes through a facile electrochemical reduction method. The optimized black 3D-TiO2 nanotubes arrays yield a maximal photocurrent density of 1.6 mA/cm2 at 0.22 V vs. Ag/AgCl with Faradic efficiency of 100%, which is about four times larger than that of the pristine 3D-TiO2 NTAs (0.4 mA/cm2). Such boosted PEC water splitting activity primarily originates from the introduction of the oxygen vacancies, which results in the bandgap shrinkage of the 3D-TiO2 NTAs, boosting the utilization efficiency of visible light including the incident, reflected and/or refracted visible light captured by the 3D configuration. Moreover, the oxygen vacancies (Ti3+) can work as electron donors, which leads to the enhanced electronic conductivity and upward shift of the Fermi energy level, and thereby facilitating the transfer and separation of the photogenerated charge carrier at the semiconductor-electrolyte interface. This work offers a new opportunity to promote the PEC water splitting activity of TiO2-based photoelectrodes.
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Affiliation(s)
- Ming Meng
- School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China; (Y.F.); (C.L.); (H.Y.); (H.Z.)
- Correspondence: (M.M.); (Z.G.)
| | - Yamin Feng
- School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China; (Y.F.); (C.L.); (H.Y.); (H.Z.)
| | - Chunyang Li
- School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China; (Y.F.); (C.L.); (H.Y.); (H.Z.)
| | - Zhixing Gan
- Key Laboratory of Optoelectronic Technology of Jiangsu Province, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210023, China
- Correspondence: (M.M.); (Z.G.)
| | - Honglei Yuan
- School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China; (Y.F.); (C.L.); (H.Y.); (H.Z.)
| | - Honghui Zhang
- School of Physics and Telecommunication Engineering, Zhoukou Normal University, Zhoukou 466001, China; (Y.F.); (C.L.); (H.Y.); (H.Z.)
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Hou C, Hao J. A three-dimensional nano-network WO 3/F-TiO 2-{001} heterojunction constructed with OH-TiOF 2 as the precursor and its efficient degradation of methylene blue. RSC Adv 2021; 11:26063-26072. [PMID: 35479479 PMCID: PMC9037076 DOI: 10.1039/d1ra04809k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 07/12/2021] [Indexed: 12/18/2022] Open
Abstract
In this study, three-dimensional nested WO3/F-TiO2-{001} photocatalysts with different WO3 loadings were prepared by a hydrothermal process and used to degrade methylene blue (MB). The photocatalysts with various ratios of WO3 to OH-TiOF2 can be transformed into a three-dimensional network WO3/F-TiO2 hetero-structure with {001} surface exposure. The results showed that the composite catalyst with 5% WO3, denoted as FWT5, had the best comprehensive degradation effect. FWT5 has a limited band gap of 2.9 eV, which can be used as an advanced photocatalyst to respond to sunlight and degrade MB. The average pore diameter of the composite catalyst is 10.3 nm, and the multi-point specific surface area is 56 m2 g−1. Compared with pure TiOF2, the average pore size of the composite catalyst decreased by 8.44 nm and the specific surface area increased by 51.2 m2 g−1, which provides a larger contact space for the catalytic components and pollutants. Moreover, TiO2 on the {001} surface has higher photocatalytic activity and methylene blue can be better degraded. Under the irradiation of 0.03 g FWT5 composite catalyst with a simulated solar light source for 2 h, the degradation rate of 10 mg L−1 methylene blue can reach 82.9%. The trapping experiment showed that photo-generated holes were the principal functional component of WO3/F-TiO2-{001} photo-catalysis, which could capture OH− and form hydroxyl radical (˙OH) and improved the photocatalytic degradation performance. Kinetic studies show that the photocatalytic degradation of MB fits with the quasi-first order kinetic model. A new type of WO3/F-TiO2-{001} heterostructure semiconductor material with a three-dimensional network structure was successfully prepared by the hydrothermal method.![]()
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Affiliation(s)
- Chentao Hou
- Department of Environmental Engineering, Xi'an University of Science and Technology Xi'an 710054 China
| | - Jing Hao
- Department of Environmental Engineering, Xi'an University of Science and Technology Xi'an 710054 China
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Cheng L, Jiang T, Zhang J. Photoelectrocatalytic degradation of deoxynivalenol on CuO-Cu 2O/WO 3 ternary film: Mechanism and reaction pathways. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 776:145840. [PMID: 33647648 DOI: 10.1016/j.scitotenv.2021.145840] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/05/2021] [Accepted: 02/09/2021] [Indexed: 06/12/2023]
Abstract
A ternary film of CuO-Cu2O/WO3 possessing high visible-light photoelectrocatalytic (PEC) performance was prepared for degradation of deoxynivalenol (DON). In such a ternary film, the introduction of CuO-Cu2O significantly promoted the absorption of WO3 in the visible region and reduced the recombination of photogenerated charge carriers. As a result, the CuO-Cu2O/WO3 film exhibited high photoelectrochemical activity under visible light illumination. The PEC performance of CuO-Cu2O/WO3 film was evaluated by the decoloration of Rhodamine B. The result indicated that the CuO-Cu2O/WO3 film exhibited higher PEC activity than WO3 or CuO-Cu2O film. When the CuO-Cu2O/WO3 film was applied to study the removal of DON, the degradation efficiency reached 87.6% after 180-min PEC treatment. According to reactive oxygen species detected by electron spin resonance analysis, a Z-scheme and type-II PEC mechanism was proposed for this ternary film. Furthermore, the intermediates formed during the PEC degradation process of DON were separated by high-performance liquid chromatography and identified with liquid chromatography-mass spectrometry. On the basis of sixteen intermediate products identified, we proposed a degradation pathway for DON in such a PEC system.
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Affiliation(s)
- Ling Cheng
- Key Laboratory of Biology and Genetic Improvement of Oil Crops, Laboratory of Quality & Safety Risk Assessment for Oilseed Products (Wuhan), Key Laboratory of Detection for Mycotoxins, Quality Inspection & Test Center for Oilseed Products, Ministry of Agriculture and Rural Affairs, Oil Crops Research Institute, Chinese Academy of Agricultural Sciences, Wuhan 430062, China
| | - Tao Jiang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Jingdong Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
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Durango-Giraldo G, Cardona A, Zapata JF, Santa JF, Buitrago-Sierra R. Titanium dioxide modified with silver by two methods for bactericidal applications. Heliyon 2019; 5:e01608. [PMID: 31193210 PMCID: PMC6522664 DOI: 10.1016/j.heliyon.2019.e01608] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 03/26/2019] [Accepted: 04/26/2019] [Indexed: 11/19/2022] Open
Abstract
“Titanium dioxide (TiO2) is a semiconductor material that exhibits antibacterial activity due to its photocatalytic properties under ultraviolet light. On the other hand, silver also exhibits strong antibacterial activity towards a wide range of microorganisms and TiO2 with silver addition exhibits more efficient photocatalytic properties than unmodified TiO2. In this work, TiO2 nanoparticles were synthesized by the hydrothermal method and modified with silver by two different methods: wet impregnation (Ex situ) and In situ incorporation. The antimicrobial activity of TiO2 nanoparticles synthesized and modified by both methods was evaluated against Escherichia coli and Staphylococcus aureus. The results showed that TiO2 nanoparticles have anatase phase. Also, spherical morphology with a mean particle size around 10.6 nm was obtained. The presence of silver in the modified TiO2 nanoparticles was confirmed by EDS and XPS. TiO2 particles modified by the Ex situ method, showed a better bactericidal activity compared to the particles modified by In situ incorporation method and TiO2 unmodified nanoparticles. This study demonstrated that both methods used to modify the titanium dioxide nanoparticles are effective as bactericidal materials and better results were found for the Ex situ method.”
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Affiliation(s)
- G. Durango-Giraldo
- Materiales Avanzados y Energía – MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia
| | - A. Cardona
- Materiales Avanzados y Energía – MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia
| | - Juan Felipe Zapata
- Materiales Avanzados y Energía – MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia
| | - Juan Felipe Santa
- Materiales Avanzados y Energía – MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia
- Universidad Nacional de Colombia, Medellín, Colombia
| | - R. Buitrago-Sierra
- Materiales Avanzados y Energía – MATyER Research Group, Facultad de Ingeniería, Instituto Tecnológico Metropolitano-ITM, Medellín, Colombia
- Corresponding author.
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Subramaniam MN, Goh PS, Lau WJ, Ismail AF. The Roles of Nanomaterials in Conventional and Emerging Technologies for Heavy Metal Removal: A State-of-the-Art Review. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E625. [PMID: 30999639 PMCID: PMC6523656 DOI: 10.3390/nano9040625] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 04/10/2019] [Accepted: 04/12/2019] [Indexed: 01/12/2023]
Abstract
Heavy metal (HM) pollution in waterways is a serious threat towards global water security, as high dosages of HM poisoning can significantly harm all living organisms. Researchers have developed promising methods to isolate, separate, or reduce these HMs from water bodies to overcome this. This includes techniques, such as adsorption, photocatalysis, and membrane removal. Nanomaterials play an integral role in all of these remediation techniques. Nanomaterials of different shapes have been atomically designed via various synthesis techniques, such as hydrothermal, wet chemical synthesis, and so on to develop unique nanomaterials with exceptional properties, including high surface area and porosity, modified surface charge, increment in active sites, enhanced photocatalytic efficiency, and improved HM removal selectivity. In this work, a comprehensive review on the role that nanomaterials play in removing HM from waterways. The unique characteristics of the nanomaterials, synthesis technique, and removal principles are presented. A detailed visualisation of HM removal performances and the mechanisms behind this improvement is also detailed. Finally, the future directions for the development of nanomaterials are highlighted.
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Affiliation(s)
- Mahesan Naidu Subramaniam
- Advanced Membrane Technology Research Centre, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia.
| | - Pei Sean Goh
- Advanced Membrane Technology Research Centre, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia.
| | - Woei Jye Lau
- Advanced Membrane Technology Research Centre, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia.
| | - Ahmad Fauzi Ismail
- Advanced Membrane Technology Research Centre, School of Chemical and Energy Engineering, Faculty of Engineering, Universiti Teknologi Malaysia, Johor 81310, Malaysia.
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Katal R, Kholghi Eshkalak S, Masudy-Panah S, Kosari M, Saeedikhani M, Zarinejad M, Ramakrishna S. Evaluation of Solar-Driven Photocatalytic Activity of Thermal Treated TiO₂ under Various Atmospheres. NANOMATERIALS 2019; 9:nano9020163. [PMID: 30699943 PMCID: PMC6409930 DOI: 10.3390/nano9020163] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 01/23/2019] [Accepted: 01/25/2019] [Indexed: 12/02/2022]
Abstract
In this report, the photocatalytic activity of P25 has been explored and the influence of thermal treatment under various atmospheres (air, vacuum and hydrogen) were discussed. The samples’ characteristics were disclosed by means of various instruments including X-ray diffraction (XRD), Electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS) and UV–vis. This study also accentuates various states of the oxygen vacancy density formed inside the samples as well as the colour turning observed in treated P25 under various atmospheres. Produced coloured TiO2 samples were then exploited for their photocatalytic capability concerning photodegradation of methylene blue (MB) using air mass (AM) 1.5 G solar light irradiation. Our findings revealed that exceptional photocatalytic activity of P25 is related to the thermal treatment. Neither oxygen vacancy formation nor photocatalytic activity enhancement was observed in the air-treated sample. H2-treated samples have shown better photoactivity which even could be further improved by optimizing treatment conditions to achieve the advantages of the positive role of oxygen vacancy (O-vacancy at higher concentration than optimum acts as electron trapping sites). The chemical structure and stability of the samples were also studied. There was no sign of deteriorating of O2-vacancies inside the samples after 6 months. High stability of thermal treated samples in terms of both long and short-term time intervals is another significant feature of the produced photocatalyst.
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Affiliation(s)
- Reza Katal
- Department of Civil & Environmental Engineering, National University of Singapore, Singapore 117576, Singapore.
| | - Saeideh Kholghi Eshkalak
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117575, Singapore.
| | - Saeid Masudy-Panah
- Department of Electrical and Computer Engineering, National University of Singapore, Singapore 119260, Singapore.
| | - Mohammadreza Kosari
- Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Singapore 119260, Singapore.
| | - Mohsen Saeedikhani
- Department of Materials Science and Engineering, National University of Singapore, Singapore 117583, Singapore.
| | - Mehrdad Zarinejad
- Singapore Institute of Manufacturing Technology (SIMTech), A*STAR (Agency for Science, Technology and Research), Singapore 138634, Singapore.
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, Center for Nanofibers and Nanotechnology, National University of Singapore, Singapore 117575, Singapore.
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Xu Y, Ren B, Wang R, Zhang L, Jiao T, Liu Z. Facile Preparation of Rod-like MnO Nanomixtures via Hydrothermal Approach and Highly Efficient Removal of Methylene Blue for Wastewater Treatment. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 9:E10. [PMID: 30583526 PMCID: PMC6359359 DOI: 10.3390/nano9010010] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 12/13/2018] [Indexed: 11/16/2022]
Abstract
In the present study, nanoscale rod-shaped manganese oxide (MnO) mixtures were successfully prepared from graphitic carbon nitride (C₃N₄) and potassium permanganate (KMnO₄) through a hydrothermal method. The as-prepared MnO nanomixtures exhibited high activity in the adsorption and degradation of methylene blue (MB). The as-synthesized products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), surface area analysis, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Furthermore, the effects of the dose of MnO nanomixtures, pH of the solution, initial concentration of MB, and the temperature of MB removal in dye adsorption and degradation experiments was investigated. The degradation mechanism of MB upon treatment with MnO nanomixtures and H₂O₂ was studied and discussed. The results showed that a maximum adsorption capacity of 154 mg g-1 was obtained for a 60 mg L-1 MB solution at pH 9.0 and 25 °C, and the highest MB degradation ratio reached 99.8% under the following optimum conditions: 50 mL of MB solution (20 mg L-1) at room temperature and pH ≈ 8.0 with 7 mg of C, N-doped MnO and 0.5 mL of H₂O₂.
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Affiliation(s)
- Yuelong Xu
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China.
- Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang 050081, China.
| | - Bin Ren
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China.
- Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang 050081, China.
| | - Ran Wang
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
| | - Lihui Zhang
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China.
- Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang 050081, China.
| | - Tifeng Jiao
- State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
- Hebei Key Laboratory of Applied Chemistry, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China.
| | - Zhenfa Liu
- Institute of Energy Resources, Hebei Academy of Sciences, Shijiazhuang 050081, China.
- Hebei Engineering Research Center for Water Saving in Industry, Shijiazhuang 050081, China.
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