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Franklin MC, Manickam S, Sunil L, Sisubalan A, Elayappan V, Kuzhandaivel H, Sivalingam Nallathambi K. Impact of Nitrogen-Enriched 1T/2H-MoS 2/CdS as an Electrode Material for Hybrid Supercapacitor. ACS APPLIED MATERIALS & INTERFACES 2024; 16:50587-50601. [PMID: 39259512 DOI: 10.1021/acsami.4c07361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/13/2024]
Abstract
Transition metal chalcogenides (TMX) have attracted energy researchers due to their role as high-performance electrode materials for energy storage devices. A facile one-pot hydrothermal technique was adopted to synthesize a molybdenum disulfide/cadmium sulfide (MoS2/CdS) (MCS) composite. The as-prepared samples were subjected to characterization techniques such as XRD, FT-IR, SEM, TEM, and XPS to assess their structure, morphology, and oxidation states. The MoS2/CdS (MCS) composites were prepared in three different ratios of molybdenum and cadmium metals. Among them, the MCS 1:2 (Mo:Cd) ratio showed better electrochemical performance with a high specific capacitance of 1336 F g-1 (high specific capacity of 185.83 mAh g-1) at a specific current of 1 A g-1 for half-cell studies. Later, a hybrid supercapacitor (HSC) device was fabricated with N-doped graphene (NG) as an anode and MCS (1:2) as a cathode, delivering a high specific energy of 34 Wh kg-1 and a specific power of 7500 W kg-1. The high nitrogen content in the MoS2 structure in MCS composites alters the device's performance, where CdS supports the composite structure through its conductivity and encourages the easy accessibility of ions. The device withstands up to 10 000 cycles with a higher Coulombic efficiency of 97% and a capacitance retention of 90.25%. The high-performance NG//MCS (1:2) HSC may be a potential candidate alternative to the existing conventional material.
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Affiliation(s)
- Manik Clinton Franklin
- Electrochemical Materials and Devices lab, Department of Chemistry, Bharathiar University, Coimbatore, Tamil Nadu 641 046, India
| | - Sornalatha Manickam
- Materials Research and Product Laboratory, Department of Chemistry, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu 641 014, India
| | - Lekshmi Sunil
- Electrochemical Materials and Devices lab, Department of Chemistry, Bharathiar University, Coimbatore, Tamil Nadu 641 046, India
| | - Akshaya Sisubalan
- Electrochemical Materials and Devices lab, Department of Chemistry, Bharathiar University, Coimbatore, Tamil Nadu 641 046, India
| | - Vijayakumar Elayappan
- Department of Materials Science and Engineering, Korea University, Seongbuk-gu, Seoul 02841, Republic of Korea
- Advanced Energy Materials R&D Division, Dongkwang Co., Ltd., 309 Daeryung Technotown, Simin-daero, Dongan-gu, Anyang-si, Gyeonggi-do 14057, Republic of Korea
| | - Hemalatha Kuzhandaivel
- Materials Research and Product Laboratory, Department of Chemistry, Coimbatore Institute of Technology, Coimbatore, Tamil Nadu 641 014, India
| | - Karthick Sivalingam Nallathambi
- Electrochemical Materials and Devices lab, Department of Chemistry, Bharathiar University, Coimbatore, Tamil Nadu 641 046, India
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2
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Kayanja O, Hassan MA, Hassanin A, Ohashi H, Khalil ASG. Optimization of isotropic MoS 2/PES membranes for efficient treatment of industrial oily wastewater. RSC Adv 2024; 14:12058-12070. [PMID: 38628476 PMCID: PMC11019293 DOI: 10.1039/d4ra01052c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2024] [Accepted: 04/01/2024] [Indexed: 04/19/2024] Open
Abstract
Elimination of tiny oil droplets nearly miscible with wastewater can be realized using membrane technology through ultrafiltration. The novelty of this work was to blend different phases of molybdenum disulfide (MoS2) in isotropic polyethersulfone (PES). We prepared isotropic PES membranes by optimizing nonsolvent vapour-induced phase separation (VIPS). Membranes were blended with MoS2 nanosheets of different phases to promote separation performance and antifouling resistance. FE-SEM revealed the flower-like surface morphology of MoS2 nanosheets. HR-TEM of MoS2 revealed 2H domains in the monolayer, flakes of a few layers and a d-spacing of 0.22 nm. Raman spectroscopy could be used to distinguish mixed-phase MoS2 from single-phase MoS2. Isotropic PES membranes modified with 70% 1T/2H MoS2 had a significantly high permeance to pure water (6911 kg m-2 h bar). The same membrane possessed a high efficiency of oil rejection of 98.78%, 97.85%, 99.83% for emulsions of industrial crude oil at 100, 1000 and 10 000 mg L-1, respectively. Removal of oil droplets from wastewater was dominated by a mechanism based on size exclusion. Isotropic PES modified with 2H MoS2 possessed superior oleophilicity, which resulted in low rejection of crude oil. Modified membranes showed excellent fouling resistance for three successive filtration cycles, as evidenced by enhanced antifouling parameters. Our study reveals how the phase composition of MoS2 nanosheets can significantly affect the performance of isotropic PES membranes during the ultrafiltration of oily wastewater.
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Affiliation(s)
- Oscar Kayanja
- Materials Science and Engineering Department, Egypt-Japan University of Science and Technology (E-JUST) 179 New Borg El-Arab City Alexandria Egypt
| | - Mohsen A Hassan
- Materials Science and Engineering Department, Egypt-Japan University of Science and Technology (E-JUST) 179 New Borg El-Arab City Alexandria Egypt
| | - Ahmed Hassanin
- Materials Science and Engineering Department, Egypt-Japan University of Science and Technology (E-JUST) 179 New Borg El-Arab City Alexandria Egypt
- Department of Textile Engineering, Faculty of Engineering, Alexandria University Alexandria 21544 Egypt
| | - Hidenori Ohashi
- Faculty of Engineering, Tokyo University of Agriculture and Technology (TUAT) 2-24-16, Naka-cho, Koganei Tokyo 184-8588 Japan
| | - Ahmed S G Khalil
- Institute of Basic and Applied Sciences, Egypt-Japan University of Science and Technology (E-JUST) 179 New Borg El-Arab City Alexandria Egypt
- Environmental and Smart Technology Group, Faculty of Science, Fayoum University 63514 Fayoum Egypt
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3
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Lee TW, Chen C. Influence of Inorganic Anions on the Chemical Stability of Molybdenum Disulfide Nanosheets in the Aqueous Environment. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:2490-2501. [PMID: 38284181 PMCID: PMC10851429 DOI: 10.1021/acs.est.3c08278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 01/11/2024] [Accepted: 01/12/2024] [Indexed: 01/30/2024]
Abstract
Chemical stability is closely associated with the transformations and bioavailabilities of engineered nanomaterials and is a key factor that governs broader and long-term application. With the growing utilization of molybdenum disulfide (MoS2) nanosheets in water treatment and purification processes, it is crucial to evaluate the stability of MoS2 nanosheets in aquatic environments. Nonetheless, the effects of anionic species on MoS2 remain largely unexplored. Herein, the stability of chemically exfoliated MoS2 nanosheets (ceMoS2) was assessed in the presence of inorganic anions. The results showed that the chemical stability of ceMoS2 was regulated by the nucleophilicities and the resultant charging effects of the anions in aquatic systems. The anions promote the dissolution of ceMoS2 by triggering a shift in the chemical potential of the ceMoS2 surface as a function of the anion nucleophilicity (i.e., charging effect). Fast charging with HCO3- and HPO42-/H2PO4- was validated by a phase transition from 1T to 2H and the emergence of MoV, and it promoted oxidative dissolution of the ceMoS2. Additionally, under sunlight, ceMoS2 dissolution was accelerated by NO3-. These findings provide insight into the ion-induced fate of ceMoS2 and the durability and risks of MoS2 nanosheets in environmental applications.
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Affiliation(s)
- Ting-Wei Lee
- Department of Environmental
Engineering, National Chung Hsing University, Taichung City 402, Taiwan
| | - Chiaying Chen
- Department of Environmental
Engineering, National Chung Hsing University, Taichung City 402, Taiwan
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4
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Ma G, Pan Z, Liu Y, Lu Y, Tao Y. Hydrothermal Synthesis of MoS 2/SnS 2 Photocatalysts with Heterogeneous Structures Enhances Photocatalytic Activity. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4436. [PMID: 37374619 DOI: 10.3390/ma16124436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 06/12/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023]
Abstract
The use of solar photocatalysts to degrade organic pollutants is not only the most promising and efficient strategy to solve pollution problems today but also helps to alleviate the energy crisis. In this work, MoS2/SnS2 heterogeneous structure catalysts were prepared by a facile hydrothermal method, and the microstructures and morphologies of these catalysts were investigated using XRD, SEM, TEM, BET, XPS and EIS. Eventually, the optimal synthesis conditions of the catalysts were obtained as 180 °C for 14 h, with the molar ratio of molybdenum to tin atoms being 2:1 and the acidity and alkalinity of the solution adjusted by hydrochloric acid. TEM images of the composite catalysts synthesized under these conditions clearly show that the lamellar SnS2 grows on the surface of MoS2 at a smaller size; high-resolution TEM images show lattice stripe distances of 0.68 nm and 0.30 nm for the (002) plane of MoS2 and the (100) plane of SnS2, respectively. Thus, in terms of microstructure, it is confirmed that the MoS2 and SnS2 in the composite catalyst form a tight heterogeneous structure. The degradation efficiency of the best composite catalyst for methylene blue (MB) was 83.0%, which was 8.3 times higher than that of pure MoS2 and 16.6 times higher than that of pure SnS2. After four cycles, the degradation efficiency of the catalyst was 74.7%, indicating a relatively stable catalytic performance. The increase in activity could be attributed to the improved visible light absorption, the increase in active sites introduced at the exposed edges of MoS2 nanoparticles and the construction of heterojunctions opening up photogenerated carrier transfer pathways and effective charge separation and transfer. This unique heterostructure photocatalyst not only has excellent photocatalytic performance but also has good cycling stability, which provides a simple, convenient and low-cost method for the photocatalytic degradation of organic pollutants.
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Affiliation(s)
- Guansheng Ma
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
| | - Zhigang Pan
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211800, China
| | - Yunfei Liu
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211800, China
| | - Yinong Lu
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211800, China
| | - Yaqiu Tao
- College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211800, China
- State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing 211800, China
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Mouloua D, Lejeune M, Rajput NS, Kaja K, El Marssi M, El Khakani MA, Jouiad M. One-step chemically vapor deposited hybrid 1T-MoS 2/2H-MoS 2 heterostructures towards methylene blue photodegradation. ULTRASONICS SONOCHEMISTRY 2023; 95:106381. [PMID: 37004414 PMCID: PMC10457596 DOI: 10.1016/j.ultsonch.2023.106381] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 03/11/2023] [Accepted: 03/22/2023] [Indexed: 06/19/2023]
Abstract
The photocatalytic degradation of methylene blue is a straightforward and cost-effective solution for water decontamination. Although many materials have been reported so far for this purpose, the proposed solutions inflicted high fabrication costs and low efficiencies. Here, we report on the synthesis of tetragonal (1T) and hexagonal (2H) mixed molybdenum disulfide (MoS2) heterostructures for an improved photocatalytic degradation efficiency by means of a single-step chemical vapor deposition (CVD) technique. We demonstrate that the 1T-MoS2/2H-MoS2 heterostructures exhibited a narrow bandgap ∼ 1.7 eV, and a very low reflectance (<5%) under visible-light, owing to their particular vertical micro-flower-like structure. We exfoliated the CVD-synthesised 1T-MoS2/2H-MoS2 films to assess their photodegradation properties towards the standard methylene blue dye. Our results showed that the photo-degradation rate-constant of the 1T-MoS2/2H-MoS2 heterostructures is much greater under UV excitation (i.e., 12.5 × 10-3 min-1) than under visible light illumination (i.e., 9.2 × 10-3 min-1). Our findings suggested that the intermixing of the conductive 1T-MoS2 with the semi-conducting 2H-MoS2 phases favors the photogeneration of electron-hole pairs. More importantly, it promotes a higher efficient charge transfer, which accelerates the methylene blue photodegradation process.
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Affiliation(s)
- D Mouloua
- Laboratory of Physics of Condensed Matter, University of Picardie Jules Verne, Scientific Pole, 33 rue Saint-Leu, 80039 Amiens Cedex 1, France; Institut National de la Recherche Scientifique, Centre-Énergie, Matériaux et Télécommunications, 1650, Blvd, Lionel-Boulet, Varennes, QC J3X-1P7, Canada
| | - M Lejeune
- Laboratory of Physics of Condensed Matter, University of Picardie Jules Verne, Scientific Pole, 33 rue Saint-Leu, 80039 Amiens Cedex 1, France
| | - N S Rajput
- Advanced Materials Research Center, Technology Innovation Institute, P.O. Box 9639, Abu Dhabi, United Arab Emirates
| | - K Kaja
- Laboratoire National de métrologie et d'essais (LNE), 29 av. Roger Hennequin, 78197 Trappes, France
| | - M El Marssi
- Laboratory of Physics of Condensed Matter, University of Picardie Jules Verne, Scientific Pole, 33 rue Saint-Leu, 80039 Amiens Cedex 1, France
| | - M A El Khakani
- Institut National de la Recherche Scientifique, Centre-Énergie, Matériaux et Télécommunications, 1650, Blvd, Lionel-Boulet, Varennes, QC J3X-1P7, Canada.
| | - M Jouiad
- Laboratory of Physics of Condensed Matter, University of Picardie Jules Verne, Scientific Pole, 33 rue Saint-Leu, 80039 Amiens Cedex 1, France.
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6
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Dong Z, Wu X, Chen M, Chen H, Huang KJ, Wang L, Xu J. Self-supporting 1T-MoS2@WS2@CC composite materials for potential high-capacity sodium storage system. J Colloid Interface Sci 2023; 630:426-435. [DOI: 10.1016/j.jcis.2022.10.072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 10/12/2022] [Accepted: 10/16/2022] [Indexed: 11/06/2022]
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7
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Effect of sulfur precursors on hydrothermal growth of MoS2 nanostructures and its visible-light-driven photocatalytic activities. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2023.134929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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8
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Kumar P, Kumar U, Huang YC, Tsai PY, Liu CH, Wu CH, Huang WM, Chen KL. Photocatalytic activity of a hydrothermally synthesized γ-Fe2O3@Au/MoS2 heterostructure for organic dye degradation under green light. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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9
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MoS2 and MoS2 Nanocomposites for Adsorption and Photodegradation of Water Pollutants: A Review. Molecules 2022; 27:molecules27206782. [PMID: 36296375 PMCID: PMC9610774 DOI: 10.3390/molecules27206782] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/04/2022] [Accepted: 10/07/2022] [Indexed: 11/30/2022] Open
Abstract
The need for fresh and conveniently treated water has become a major concern in recent years. Molybdenum disulfide (MoS2) nanomaterials are attracting attention in various fields, such as energy, hydrogen production, and water decontamination. This review provides an overview of the recent developments in MoS2-based nanomaterials for water treatment via adsorption and photodegradation. Primary attention is given to the structure, properties, and major methods for the synthesis and modification of MoS2, aiming for efficient water-contaminant removal. The combination of MoS2 with other components results in nanocomposites that can be separated easily or that present enhanced adsorptive and photocatalytic properties. The performance of these materials in the adsorption of heavy metal ions and organic contaminants, such as dyes and drugs, is reviewed. The review also summarizes current progress in the photocatalytic degradation of various water pollutants, using MoS2-based nanomaterials under UV-VIS light irradiation. MoS2-based materials showed good activity after several reuse cycles and in real water scenarios. Regarding the ecotoxicity of the MoS2, the number of studies is still limited, and more work is needed to effectively evaluate the risks of using this nanomaterial in water treatment.
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10
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Alhajri F, Fadlallah MM, Alkhaldi A, Maarouf AA. Hybrid MXene-Graphene/Hexagonal Boron Nitride Structures: Electronic and Molecular Adsorption Properties. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2739. [PMID: 36014604 PMCID: PMC9416010 DOI: 10.3390/nano12162739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 07/27/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
Recent advances in experimental techniques allow for the fabrication of hybrid structures. Here, we study the electronic and molecular adsorption properties of the graphene (G)/hexagonal boron nitride (h-BN)-MXenes (Mo2C) hybrid nanosheets. We use first-principles calculations to explore the structure and electronic properties of the hybrid structures of G-2H-Mo2C and h-BN-2H-Mo2C with two different oxygen terminations of the Mo2C surface. The embedding of G or h-BN patches creates structural defects at the patch-Mo2C border and adds new states in the vicinity of the Fermi energy. Since this can be utilized for molecular adsorption and/or sensing, we investigate the ability of the G-M-O1 and BN-M-O1 hybrid structures to adsorb twelve molecules. Generally, the adsorption on the hybrid systems is significantly higher than on the pristine systems, except for N2 and H2, which are weakly adsorbed on all systems. We find that OH, NO, NO2, and SO2 are chemisorbed on the hybrid systems. COOH may be chemisorbed, or it may dissociate depending on its location at the edge between the G/h-BN and the MXene. NH3 is chemisorbed/physisorbed on the BN/G-M-O1 systems. CO, H2S, CO2, and CH4 are physisorbed on the hybrid systems. Our results indicate that the studied hybrid systems can be used for molecular filtration/sensing and catalysis.
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Affiliation(s)
- Fawziah Alhajri
- Department of Physics, Science College, Imam Abdulrahman Bin Faisal University, Jubail 3196, Saudi Arabia
| | | | - Amal Alkhaldi
- Department of Physics, Science College, Imam Abdulrahman Bin Faisal University, Jubail 3196, Saudi Arabia
| | - Ahmed A. Maarouf
- Department of Physics, Faculty of Basic Sciences, German University in Cairo, New Cairo City 11835, Egypt
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Rahman A, Jennings JR, Tan AL, Khan MM. Molybdenum Disulfide-Based Nanomaterials for Visible-Light-Induced Photocatalysis. ACS OMEGA 2022; 7:22089-22110. [PMID: 35811905 PMCID: PMC9260757 DOI: 10.1021/acsomega.2c01314] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Accepted: 06/08/2022] [Indexed: 05/08/2023]
Abstract
Visible-light-responsive photocatalytic materials have a multitude of important applications, ranging from energy conversion and storage to industrial waste treatment. Molybdenum disulfide (MoS2) and its variants exhibit high photocatalytic activity under irradiation by visible light as well as good stability and recyclability, which are desirable for all photocatalytic applications. MoS2-based materials have been widely applied in various fields such as wastewater treatment, environmental remediation, and organic transformation reactions because of their excellent physicochemical properties. The present review focuses on the fundamental properties of MoS2, recent developments and remaining challenges, and key strategies for tackling issues related to the utilization of MoS2 in photocatalysis. The application of MoS2-based materials in visible-light-induced catalytic reactions for the treatment of diverse kinds of pollutants including industrial, environmental, pharmaceutical, and agricultural waste are also critically discussed. The review concludes by highlighting the prospects of MoS2 for use in various established and emerging areas of photocatalysis.
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Affiliation(s)
- Ashmalina Rahman
- Chemical
Sciences, Faculty of Science, Universiti
Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - James Robert Jennings
- Applied
Physics, Faculty of Science, Universiti
Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
- Optoelectronic
Device Research Group, Universiti Brunei
Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Ai Ling Tan
- Chemical
Sciences, Faculty of Science, Universiti
Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
| | - Mohammad Mansoob Khan
- Chemical
Sciences, Faculty of Science, Universiti
Brunei Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
- Optoelectronic
Device Research Group, Universiti Brunei
Darussalam, Jalan Tungku Link, Gadong, BE 1410, Brunei Darussalam
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K A SR, Adhikari S, Radhakrishnan S, Johari P, Rout CS. Effect of cobalt doping on the enhanced energy storage performance of 2D vanadium diselenide: experimental and theoretical investigations. NANOTECHNOLOGY 2022; 33:295703. [PMID: 35417889 DOI: 10.1088/1361-6528/ac66ee] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 04/13/2022] [Indexed: 06/14/2023]
Abstract
Vanadium Diselenide (VSe2) is a prominent candidate in the 2D transition metal dichalcogenides family for energy storage applications. Herein, we report the experimental and theoretical investigations on the effect of cobalt doping in 1T-VSe2. The energy storage performance in terms of specific capacitance, stability and energy and power density is studied. It is observed that 3% Co doped VSe2exhibits better energy storage performance as compared to other concentrations, with a specific capacitance of ∼193 F g-1in a two-electrode symmetric configuration. First-principles Density Functional Theory based simulations support the experimental findings by suggesting an enhanced quantum capacitance value after the Co doping in the 1T-VSe2. By making use of the advantages of the specific electrode materials, a solid state asymmetric supercapacitor (SASC) is also assembled with MoS2as the negative electrode. The assembled Co-VSe2//MoS2SASC device shows excellent energy storage performance with a maximum energy density of 33.36 Wh kg-1and a maximum power density of 5148 W kg-1with a cyclic stability of 90% after 5000 galvano static charge discharge cycles.
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Affiliation(s)
- Sree Raj K A
- Centre for Nano and Material Science, Jain University, Jain global campus, Jakkasandra, Ramanagaram, Banglore-562112, India
| | - Surajit Adhikari
- Department of Physics, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh-201314, India
| | - Sithara Radhakrishnan
- Centre for Nano and Material Science, Jain University, Jain global campus, Jakkasandra, Ramanagaram, Banglore-562112, India
| | - Priya Johari
- Department of Physics, School of Natural Sciences, Shiv Nadar University, Uttar Pradesh-201314, India
| | - Chandra Sekhar Rout
- Centre for Nano and Material Science, Jain University, Jain global campus, Jakkasandra, Ramanagaram, Banglore-562112, India
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13
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Patriarchea C, Vamvasakis I, Koutsouroubi ED, Armatas GS. Enhancing interfacial charge transfer in mesoporous MoS2/CdS nanojunction architectures for highly efficient visible-light photocatalytic water splitting. Inorg Chem Front 2022. [DOI: 10.1039/d1qi01278a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Mesoporous MoS2-modified CdS nanojunction networks possessing advantageous electronic connectivity and charge transfer behavior at the interfaces deliver highly efficient visible-light photocatalytic H2 production activity from water splitting.
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Affiliation(s)
- Chrysanthi Patriarchea
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Ioannis Vamvasakis
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Eirini D. Koutsouroubi
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
| | - Gerasimos S. Armatas
- Department of Materials Science and Technology, University of Crete, Heraklion 70013, Greece
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14
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Single-Layer MoS2-MoO3-x Heterojunction Nanosheets with Simultaneous Photoluminescence and Co-Photocatalytic Features. Catalysts 2021. [DOI: 10.3390/catal11121445] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Single-layer MoS2-MoO3-x heterojunction nanosheets with visible-light-sensitive band gap energy and average lateral dimensions of ~70 nm were synthesized by using a two-step combined exfoliation method. The exfoliation was initiated from pristine MoS2, while some sulfur sites in expanded MoS2 sheets during exfoliating were substituted by ambient non-thermal oxygen, resulting in formation of α-MoO3-x crystalline domains. The morphological features, crystalline structure, phase formation, number of layers, and optical properties of the MoS2-MoO3-x nanosheets were determined by atomic force microscopy; X-ray diffraction; field emission electron microscopy; transmission electron microscopy; and Raman, UV–visible–NIR, diffuse transmittance, and photoluminescence spectroscopies. The produced α-MoO3-x domains displayed a narrower indirect band gap energy (~1.95 eV) than that of stoichiometric MoO3 (~3 eV), and a broad light absorption range from visible to near-infrared region can act as a plasmonic material facilitating the separation of the photoinduced carriers and enhancing the photocatalytic activity of the MoS2 domain, having ~1.75(2.16) eV indirect (direct) band gap energy. In this regard, the MoS2-MoO3-x heterojunction nanosheets showed single-layer-based excitation-dependent luminescence emissions and visible-light-induced photocatalytic features, at the same time. This study can contribute to promising applications of sheet-like nanomaterials for purposes requiring simultaneous photoluminescence and photocatalytic features, such as in-vivo monitoring and targeting.
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15
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Murugesan RA, Raja KCN. A comparative study on the electrochemical capacitor performance of 1T/2H hybridized phase and 2H pure phase of MoS 2nanoflowers. NANOTECHNOLOGY 2021; 33:035402. [PMID: 34624877 DOI: 10.1088/1361-6528/ac2e24] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 10/07/2021] [Indexed: 06/13/2023]
Abstract
The 1T/2H hybridized and 2H pure phases of MoS2nanoflowers were synthesized in a one-step hydrothermal process with the molybdenum source as sodium molybdate dihydrate and the sulfur source as thiourea. The as-prepared 1T/2H hybridized and 2H pure phases of MoS2were investigated using a thermogravimetry\differential thermal analysis, powder x-ray diffraction, field emission scanning electron microscopy, and energy-dispersive x-ray spectroscopy. The obtained 1T/2H hybridized phases of MoS2were confirmed by the Raman spectroscopy. The electrochemical characteristics of MoS2electrodes were examined using cycle voltammetry, galvanostatic charge-discharge and electrochemical impedance spectroscopy. The electrodes are based on the 1T/2H hybridized phases MoS2with specific capacitance (Cp) of 555.4 F g-1at current densities (Cd) of 0.5 A g-1, capacity retention ratio of 85% after 10 000 cycles were observed that could be a strong potential electrode material for supercapacitors application.
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Affiliation(s)
- Ramesh Aravind Murugesan
- Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore-632014, India
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Omar AMA, Hassen A, Metwalli OI, Saber MR, Mohamed SRE, Khalil ASG. Construction of 2D layered TiO 2@MoS 2heterostructure for efficient adsorption and photodegradation of organic dyes. NANOTECHNOLOGY 2021; 32:335605. [PMID: 33971641 DOI: 10.1088/1361-6528/abff8a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 05/09/2021] [Indexed: 06/12/2023]
Abstract
In this work, heterostructures of coupled TiO2@MoS2with different phases of MoS2were synthesized via hydrothermal technique. The prepared materials were thoroughly characterized using various techniques, including XRD, SEM, transmission electron microscopy, Brunauer-Emmet-Teller, XPS, Zeta potential and UV-vis spectroscopy. The optimized nanocomposites were tested for the photocatalytic degradation of methyl Orange (MO) under visible light as well as the adsorption of Rhodamine b (RhB) and methelene blue (MB) dyes. The TiO2@1T/2H-MoS2heterostructures exhibited a narrow bandgap compared to the other studied nanomaterials. A remarkable photodegradation efficiency of TiO2@1T/2H-MoS2was observed, which completely degraded 20 ppm of MO after 60 min with high stability over four successive cycles. This can be assigned to the formation of unique heterostructures with aligned energy bands between MoS2nanosheets and TiO2nanobelts. The formation of these novel interfaces promoted the electron transfer and increased the separation efficiency of carriers, resulting in high photocatalytic degradation. Furthermore, the adsorption efficiency of TiO2@1T/2H-MoS2was unique, 20 ppm solutions of RhB and MB were removed after 1 and 2 min, respectively. The superior adsorption performance of the TiO2@1T/2H-MoS2can be attributed to its high surface area (279.9 m2g-1) and the rich concentration of active sites. The kinetics and the isothermal analysis revealed that the TiO2@1T/2H MoS2heterstructures have maximum adsorption capacity of 1200 and 970 mg g-1for RhB and MB, respectively. This study provides a powerful way for designing an effective photocatalyst and adsorbent TiO2-based nanocomposites for water remediation.
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Affiliation(s)
- Asmaa M A Omar
- Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
| | - Arafa Hassen
- Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
| | - Ossama I Metwalli
- Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
| | - Mohamed R Saber
- Chemistry Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
| | - Sayed R E Mohamed
- Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
| | - Ahmed S G Khalil
- Physics Department, Faculty of Science, Fayoum University, 63514 Fayoum, Egypt
- Materials Science & Engineering Department, School of Innovative Design Engineering, Egypt-Japan University of Science and Technology (E-JUST), 179 New Borg El-Arab City, Egypt
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Lai MTL, Lee KM, Yang TCK, Pan GT, Lai CW, Chen CY, Johan MR, Juan JC. The improved photocatalytic activity of highly expanded MoS 2 under visible light emitting diodes. NANOSCALE ADVANCES 2021; 3:1106-1120. [PMID: 36133295 PMCID: PMC9417696 DOI: 10.1039/d0na00936a] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 12/27/2020] [Indexed: 06/13/2023]
Abstract
Photocatalytic degradation is a promising method to remove organic pollutants from water. Photocatalysts based on two-dimensional (2D) transition metal dichalcogenides (TMDs) such as MoS2 nanomaterials have gained tremendous popularity. This is due to their narrow band gap and high visible light absorption. Herein, a MoS2 photocatalyst with highly expanded interlayer spaces of 1.51 nm was synthesized in the presence of Pluronic F-127 as a template by a facile one-pot hydrothermal method. This expanded MoS2 (MF-1) managed to photodegrade 98% (2.62 × 10-2 min-1) of methylene blue (MB) dye under irradiation of 1 W visible light-emitting diode (LED) white light. The dominant performance of MF-1 is attributed to the highly expanded interlayer spacing, which exposed more active edge sites. Moreover, the formation of surface defects such as surface cracks and sulfur vacancies (Sv) facilitates the adsorption capacity and in situ generation of reactive oxygen species (ROS). The dominant ROS responsible for the photodegradation of MB is superoxide radical (˙O2 -). The photocatalyst shows good recyclability without deterioration even after five consecutive cycles.
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Affiliation(s)
- Magdeline Tze Leng Lai
- Nanotechnology & Catalysis Research Centre, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia
| | - Kian Mun Lee
- Nanotechnology & Catalysis Research Centre, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia
| | - Thomas Chung Kuang Yang
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology Taipei Taiwan
| | - Guan Ting Pan
- Department of Chemical Engineering and Biotechnology, National Taipei University of Technology Taipei Taiwan
| | - Chin Wei Lai
- Nanotechnology & Catalysis Research Centre, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia
| | - Chia-Yun Chen
- Department of Materials Science and Engineering, National Cheng Kung University Tainan 70101 Taiwan
- Hierarchical Green-Energy Materials (Hi-GEM) Research Center, National Cheng Kung University Tainan 70101 Taiwan
| | - Mohd Rafie Johan
- Nanotechnology & Catalysis Research Centre, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia
| | - Joon Ching Juan
- Nanotechnology & Catalysis Research Centre, Institute for Advanced Studies, University of Malaya 50603 Kuala Lumpur Malaysia
- School of Science, Monash University Malaysia Campus, Jalan Lagoon Selatan 46150 Sunway Selangor Malaysia
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Yuan Y, Guo RT, Hong LF, Ji XY, Li ZS, Lin ZD, Pan WG. Recent advances and perspectives of MoS2-based materials for photocatalytic dyes degradation: A review. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2020.125836] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Khabiri G, Aboraia AM, Omar S, Soliman M, Omar AMA, Kirichkov MV, Soldatov AV. The enhanced photocatalytic performance of SnS 2@MoS 2 QDs with highly-efficient charge transfer and visible light utilization for selective reduction of mythlen-blue. NANOTECHNOLOGY 2020; 31:475602. [PMID: 32615552 DOI: 10.1088/1361-6528/aba212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Molybdenum disulfide (MoS2) has recently been considered as an effective material for potential photocatalytic applications; however, its photocatalytic activity was limited due to the low density of active sites. In this work, MoS2 Quantum dots (QDs) were synthesized via the ultrasonication technique to construct heterostructure with SnS2 nanosheets (SnS2@MoS2 QDs) and the prepared materials were tested for photocatalytic applications for Methylene blue (MB). Pristine SnS2 and SnS2@MoS2 QDs nanocomposite were analyzed by XRD, TEM, PL, and Uv-Vis. Both SnS2 and SnS2@MoS2 QDs exhibited a single trigonal phase with the P-3m1 space group. The TEM analysis confirmed the coupling between the pristine SnS2 and SnS2@MoS2 QDs. The results of photocatalytic activity toward MB indicated that SnS2@MoS2 QDs material exhibits much superior photocatalytic performance compared to pristine SnS2. The excellent photodegradation performance of SnS2@MoS2 QDs is due in the main to the formation of heterojunction between SnS2 and MoS2 QDs with narrow bandgap formation, which results in a facile carriers transfer and thus high photocatalytic efficiency. A representative mechanism of the photodegradation for SnS2@MoS2 QDs photocatalyst was proposed. Such an ultrasonic technique is capable of producing small metallic particle size that can be used to construct new heterostructures for water remediation applications.
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Affiliation(s)
- Gomaa Khabiri
- Smart Materials Research Institute, Southern Federal University, Sladkova 178/24, 344090, Rostov-on-Don, Russia. Physics Department, Center for Environmental and Smart Technology (CEST), Faculty of Science, Fayoum University, Fayoum 63514, Egypt
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Uddin N, Zhang H, Du Y, Jia G, Wang S, Yin Z. Structural-Phase Catalytic Redox Reactions in Energy and Environmental Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1905739. [PMID: 31957161 DOI: 10.1002/adma.201905739] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/11/2019] [Indexed: 06/10/2023]
Abstract
The structure-property engineering of phase-based materials for redox-reactive energy conversion and environmental decontamination nanosystems, which are crucial for achieving feasible and sustainable energy and environment treatment technology, is discussed. An exhaustive overview of redox reaction processes, including electrocatalysis, photocatalysis, and photoelectrocatalysis, is given. Through examples of applications of these redox reactions, how structural phase engineering (SPE) strategies can influence the catalytic activity, selectivity, and stability is constructively reviewed and discussed. As observed, to date, much progress has been made in SPE to improve catalytic redox reactions. However, a number of highly intriguing, unresolved issues remain to be discussed, including solar photon-to-exciton conversion efficiency, exciton dissociation into active reductive/oxidative electrons/holes, dual- and multiphase junctions, selective adsorption/desorption, performance stability, sustainability, etc. To conclude, key challenges and prospects with SPE-assisted redox reaction systems are highlighted, where further development for the advanced engineering of phase-based materials will accelerate the sustainable (active, reliable, and scalable) production of valuable chemicals and energy, as well as facilitate environmental treatment.
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Affiliation(s)
- Nasir Uddin
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Huayang Zhang
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Yaping Du
- School of Materials Science and Engineering, National Institute for Advanced Materials, Center for Rare Earth and Inorganic Functional Materials, Nankai University, Tianjin, 300350, China
| | - Guohua Jia
- Curtin Institute of Functional Molecules and Interfaces, School of Molecular and Life Sciences, Curtin University, Perth, WA, 6845, Australia
| | - Shaobin Wang
- School of Chemical Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia
| | - Zongyou Yin
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
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Omar AM, Metwalli OI, Saber MR, Khabiri G, Ali MEM, Hassen A, Khalil MMH, Maarouf AA, Khalil ASG. Revealing the role of the 1T phase on the adsorption of organic dyes on MoS2 nanosheets. RSC Adv 2019; 9:28345-28356. [PMID: 35529663 PMCID: PMC9071015 DOI: 10.1039/c9ra05427h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/29/2019] [Indexed: 01/02/2023] Open
Abstract
Herein, different phases of MoS2 nanosheets were synthesized, characterized and tested for dye removal from water. The influence of the MoS2 phases as well as the 1T concentration on the adsorption performance of organic dyes MO, RhB and MB was deeply investigated. The results revealed that the 1T-rich MoS2 nanosheets have superior adsorption performance compared to other 2H and 3R phases. The kinetic results of the adsorption process demonstrate that the experimental data followed the pseudo-second order equation. Meanwhile, the adsorption of dyes over the obtained materials was fitted with several isotherm models. The Langmuir model gives the best fitting to the experimental data with maximum a adsorption capacity of 787 mg g−1. The obtained capacity is significantly higher than that of all previous reports for similar MoS2 materials. Computational studies of the 2H and 1T/2H-MoS2 phases showed that the structural defects present at the 1T/2H grain boundaries enhance the binding of hydroxide and carboxyl groups to the MoS2 surface which in turn increase the adsorption properties of the 1T/2H-MoS2 phase. The high adsorption capacity of dyes onto the 1T-rich MoS2 samples is due to the strong binding between the hydroxide/carboxyl groups and the 1T active sites. The capacity can be tuned by controlling the ratio between 1T and 2H phases of MoS2 nanosheets.![]()
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Affiliation(s)
- Asmaa M. Omar
- Environmental and Smart Technology Group (ESTG)
- Physics Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
| | - Ossama I. Metwalli
- Environmental and Smart Technology Group (ESTG)
- Physics Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
| | - Mohamed R. Saber
- Chemistry Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
- Egypt
| | - Gomaa Khabiri
- Environmental and Smart Technology Group (ESTG)
- Physics Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
| | - Mohamed E. M. Ali
- Water Pollution Research Department
- National Research Centre
- Giza
- Egypt
| | - Arafa Hassen
- Environmental and Smart Technology Group (ESTG)
- Physics Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
| | | | - Ahmed A. Maarouf
- Department of Physics
- IRMC
- Imam Abdulrahman Bin Faisal University
- Saudia Arabia
| | - Ahmed S. G. Khalil
- Environmental and Smart Technology Group (ESTG)
- Physics Department
- Faculty of Science
- Fayoum University
- 63514 Fayoum
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