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Ke X, Tang C, Xiong R, Xiao Y, Cheng B, Lei S. Three-Dimensional Multihierarchical Hexagonal/Cubic ZnIn 2S 4 S-Scheme Heterophase Junction for Superior Photocatalysis. Inorg Chem 2024; 63:2157-2173. [PMID: 38206809 DOI: 10.1021/acs.inorgchem.3c04102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2024]
Abstract
It is an important strategy to design composite materials with a special microstructure and a tunable electronic structure through structural compatibility. In this work, a novel hexagonal/cubic ZnIn2S4 polymorphic heterophase junction with a three-dimensional multihierarchical structure is successfully constructed by in situ growth of hexagonal ZnIn2S4 nanosheets on the surface of cubic ZnIn2S4 flower-like microspheres prepared by topological chemical synthesis. On the one hand, the multihierarchical architecture provides large specific surface area, abundant active sites, and excellent light trapping capability. On the other hand, the construction of a direct S-scheme heterophase junction enables the formation of a special charge-transfer channel under the force of a built-in electric field, which not only improves the separation efficiency of carriers but also ensures the stronger reaction activity of charges. The prepared ZnIn2S4 heterophase junction composite photocatalyst exhibits greatly boosted photocatalytic efficiency in rhodamine B degradation, hexavalent chromium reduction, and water splitting for hydrogen production, which are 12.3, 6.5, and 3.1 times higher than that of pure hexagonal ZnIn2S4 and 8.1, 5.1, and 2.3 times higher than that of pure cubic ZnIn2S4, respectively, demonstrating its significant potential for applications in energy and environmental fields.
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Affiliation(s)
- Xiaoxue Ke
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
| | - Changcun Tang
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
| | - Renzhi Xiong
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
| | - Yanhe Xiao
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
| | - Baochang Cheng
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
| | - Shuijin Lei
- School of Physics and Materials Science, Nanchang University, Nanchang 330031, China
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Ashraf W, Parvez SH, Khanuja M. Synthesis of highly efficient novel two-step spatial 2D photocatalyst material WS 2/ZnIn 2S 4 for degradation/reduction of various toxic pollutants. ENVIRONMENTAL RESEARCH 2023; 236:116715. [PMID: 37481055 DOI: 10.1016/j.envres.2023.116715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2023] [Revised: 07/10/2023] [Accepted: 07/19/2023] [Indexed: 07/24/2023]
Abstract
In this article, we report the synthesis, characterization of novel biofriendly 2D/2D heterostructure WS2/ZnIn2S4 material in which 2D WS2 nanosheets are uniformly distributed spatially onto the spherically arranged 2D leaves of ZnIn2S4. We then studied the in-depth photocatalytic degradation activity of this novel nanocomposite and its pristine component materials on cationic dye: malachite green, anionic dye: congo red and reduction of heavy metal: chromium(VI) and the degradation efficiency of composite material was also tested on rhodamine-B, methylene blue, methyl orange dyes and acetaminophen/paracetamol drug. Form factor, structure factor and shape factor analysis has been carried out using X-ray diffractometry (XRD). Bond vibrations, functional groups and phonon vibration mode analysis has been done based on Fourier transform infrared (FTIR) spectroscopy and Raman spectroscopy. Morphological and compositional analysis has been done using field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDAX) and X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM). Surface area and pore size/distribution was characterized using Brunauer-Emmett-Teller (BET) method and Barrett-Joyner-Halenda Model. Degradation pathways and intermediate products are proposed using the high-performance liquid chromatography (HPLC). Photocatalytic activity of the nanocomposite WS2/ZnIn2S4 is compared with pristine ZnIn2S4 and pristine WS2, which shows more than 50% enhancement in both efficiency and rate of degradation/reduction for all the pollutants. A scavenger study was carried out to get insight of primary and secondary reactive oxygen species (ROS) taking part in degradation. Exciton lifetime, surface charge and stability, and flat band positions were studied based on time-correlated single photon counting (TCSPC) also known as time-resolved photoluminescence (TRPL), zeta potential, and Mott-Schottky respectively. Rate kinetics study was performed to analyze the physical and chemical behaviour of the nanocomposite with pollutants in consideration. Results show ∼100%, ∼90%, and ∼95% degradation efficiency by the heterostructure for malachite green (MG), congo red (CR), and reduction of heavy metal chromium (Cr(VI)) respectively within 5 min, which is a huge improvement as compared to pristine WS2 and pristine ZnIn2S4, both of which show the efficiencies of only ∼25% to∼75% in all the cases.
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Affiliation(s)
- Waseem Ashraf
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi, 110025, India.
| | - Syed Hasan Parvez
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi, 110025, India
| | - Manika Khanuja
- Centre for Nanoscience and Nanotechnology, Jamia Millia Islamia, New Delhi, 110025, India.
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Mykhailovych V, Caruntu G, Graur A, Mykhailovych M, Fochuk P, Fodchuk I, Rotaru GM, Rotaru A. Fabrication and Characterization of Dielectric ZnCr 2O 4 Nanopowders and Thin Films for Parallel-Plate Capacitor Applications. MICROMACHINES 2023; 14:1759. [PMID: 37763922 PMCID: PMC10534308 DOI: 10.3390/mi14091759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 09/04/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023]
Abstract
We report here the successful shape-controlled synthesis of dielectric spinel-type ZnCr2O4 nanoparticles by using a simple sol-gel auto-combustion method followed by successive heat treatment steps of the resulting powders at temperatures from 500 to 900 °C and from 5 to 11 h, in air. A systematic study of the dependence of the morphology of the nanoparticles on the annealing time and temperature was performed by using field effect scanning electron microscopy (FE-SEM), powder X-ray diffraction (PXRD) and structure refinement by the Rietveld method, dynamic lattice analysis and broadband dielectric spectrometry, respectively. It was observed for the first time that when the aerobic post-synthesis heat treatment temperature increases progressively from 500 to 900 °C, the ZnCr2O4 nanoparticles: (i) increase in size from 10 to 350 nm and (ii) develop well-defined facets, changing their shape from shapeless to truncated octahedrons and eventually pseudo-octahedra. The samples were found to exhibit high dielectric constant values and low dielectric losses with the best dielectric performance characteristics displayed by the 350 nm pseudo-octahedral nanoparticles whose permittivity reaches a value of ε = 1500 and a dielectric loss tan δ = 5 × 10-4 at a frequency of 1 Hz. Nanoparticulate ZnCr2O4-based thin films with a thickness varying from 0.5 to 2 μm were fabricated by the drop-casting method and subsequently incorporated into planar capacitors whose dielectric performance was characterized. This study undoubtedly shows that the dielectric properties of nanostructured zinc chromite powders can be engineered by the rational control of their morphology upon the variation of the post-synthesis heat treatment process.
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Affiliation(s)
- Vasyl Mykhailovych
- Department of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University of Suceava, 13, University St., No. 13, 720229 Suceava, Romania
- Department of General Chemistry and Material Science, Yuriy Fedkovych Chernivtsi National University, 2, Kotsjubynskyi St., 58012 Chernivtsi, Ukraine
- Physical, Technical and Computer Science Institute, Yuriy Fedkovych Chernivtsi National University, 2, Kotsjubynskyi St., 58012 Chernivtsi, Ukraine
| | - Gabriel Caruntu
- Department of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University of Suceava, 13, University St., No. 13, 720229 Suceava, Romania
- Department of Chemistry and Biochemistry, Central Michigan University, 1200 S. Franklin St., Mount Pleasant, MI 48859, USA
- Science of Advanced Materials Program, Central Michigan University, 1200 S. Franklin St., Mount Pleasant, MI 48859, USA
| | - Adrian Graur
- Department of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University of Suceava, 13, University St., No. 13, 720229 Suceava, Romania
| | - Mariia Mykhailovych
- Department of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University of Suceava, 13, University St., No. 13, 720229 Suceava, Romania
- Department of General Chemistry and Material Science, Yuriy Fedkovych Chernivtsi National University, 2, Kotsjubynskyi St., 58012 Chernivtsi, Ukraine
| | - Petro Fochuk
- Department of General Chemistry and Material Science, Yuriy Fedkovych Chernivtsi National University, 2, Kotsjubynskyi St., 58012 Chernivtsi, Ukraine
| | - Igor Fodchuk
- Physical, Technical and Computer Science Institute, Yuriy Fedkovych Chernivtsi National University, 2, Kotsjubynskyi St., 58012 Chernivtsi, Ukraine
| | - Gelu-Marius Rotaru
- Faculty of Mechanical Engineering Mechatronics and Management & Research Center MANSiD, Stefan cel Mare University, 720229 Suceava, Romania
| | - Aurelian Rotaru
- Department of Electrical Engineering and Computer Science & Research Center MANSiD, Stefan cel Mare University of Suceava, 13, University St., No. 13, 720229 Suceava, Romania
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