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Birdeanu M, Fratilescu I, Epuran C, Mocanu L, Ianasi C, Lascu A, Fagadar-Cosma E. Nanomaterials Based on Collaboration with Multiple Partners: Zn 3Nb 2O 8 Doped with Eu 3+ and/or Amino Substituted Porphyrin Incorporated in Silica Matrices for the Discoloration of Methyl Red. Int J Mol Sci 2023; 24:ijms24108920. [PMID: 37240266 DOI: 10.3390/ijms24108920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/09/2023] [Accepted: 05/16/2023] [Indexed: 05/28/2023] Open
Abstract
Designing appropriate materials destined for the removal of dyes from waste waters represents a great challenge for achieving a sustainable society. Three partnerships were set up to obtain novel adsorbents with tailored optoelectronic properties using silica matrices, Zn3Nb2O8 oxide doped with Eu3+, and a symmetrical amino-substituted porphyrin. The pseudo-binary oxide with the formula Zn3Nb2O8 was obtained by the solid-state method. The doping of Zn3Nb2O8 with Eu3+ ions was intended in order to amplify the optical properties of the mixed oxide that are highly influenced by the coordination environment of Eu3+ ions, as confirmed by density functional theory (DFT) calculations. The first proposed silica material, based solely on tetraethyl orthosilicate (TEOS) with high specific surface areas of 518-726 m2/g, offered better performance as an adsorbent than the second one, which also contained 3-aminopropyltrimethoxysilane (APTMOS). The contribution of amino-substituted porphyrin incorporated into silica matrices resides both in providing anchoring groups for the methyl red dye and in increasing the optical properties of the whole nanomaterial. Two different types of methyl red adsorption mechanisms can be reported: one based on surface absorbance and one based on the dye entering the pores of the adsorbents due to their open groove shape network.
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Affiliation(s)
- Mihaela Birdeanu
- National Institute for Research and Development in Electrochemistry and Condensed Matter, Plautius Andronescu Street 1, 300224 Timisoara, Romania
| | - Ion Fratilescu
- Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania
| | - Camelia Epuran
- Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania
| | - Liviu Mocanu
- National Institute for Research and Development in Electrochemistry and Condensed Matter, Plautius Andronescu Street 1, 300224 Timisoara, Romania
| | - Catalin Ianasi
- Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania
| | - Anca Lascu
- Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania
| | - Eugenia Fagadar-Cosma
- Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania
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Faisal M, Iqbal A, Adam F, Jothiramalingam R. Effect of Cu doping on the photocatalytic activity of InVO 4 for hazardous dye photodegradation under LED light and its mechanism. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 84:576-595. [PMID: 34388120 DOI: 10.2166/wst.2021.244] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Cu doped InVO4 (xCu-InVO4 (x = 0.06-0.15 wt %) was synthesized by a facile one-pot hydrothermal method for the removal of methylene blue (MB) under LED light irradiation. The X-ray photoelectron spectroscopy (XPS) analysis indicated the coexistence of V5+ and V4+ species due to the O-deficient nature of the xCu-InVO4. The synthesized photocatalysts displayed a morphology of spherical and square shaped particles (20-40 nm) and micro-sized rectangle rods with a length range of 100-200 μm. The xCu-InVO4 exhibited superior adsorption and photodegradation efficiency compared to pristine InVO4 and TiO2 due to the presence of O2 vacancies, V4+/V5+ species, and Cu dopant. The optimum reaction conditions were found to be 5 mg L-1 (MB concentration), pH 6, and 100 mg of photocatalyst mass with a removal efficiency and mineralization degree of 100% and 96.67%, respectively. The main active species responsible for the degradation of MB were •OH radicals and h+. Reusability studies indicated that the 0.13Cu-InVO4 was deactivated after a single cycle of photocatalytic reaction due to significant leaching of V4+ and Cu2+ species.
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Affiliation(s)
- Mohamed Faisal
- School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - Anwar Iqbal
- School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - Farook Adam
- School of Chemical Sciences, Universiti Sains Malaysia, Penang 11800, Malaysia
| | - R Jothiramalingam
- Surfactant Research Chair, Department of Chemistry, College of Sciences, King Saud University, Riyadh 11451, Saudi Arabia
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Huang S, Xiahou J, Zhu Q, Takei T, Kim BN, Li JG. Malate-aided selective crystallization and luminescence comparison of tetragonal and monoclinic LaVO 4:Eu nanocrystals. Dalton Trans 2021; 50:10147-10158. [PMID: 34231601 DOI: 10.1039/d1dt01644j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With malate (Mal2-) as a new type of chelate, tetragonal (t-) and monoclinic (m-) structured LaVO4:Eu crystals (∼10-60 nm) were selectively crystallized as nanosquares and nanorods via a hydrothermal reaction at 200 °C for 24 h. The effects of the Mal2-:(La,Eu)3+ molar ratio, solution pH and Eu3+ content on the phase structure and crystal morphology were systematically investigated and elucidated. The competition between OH- and Mal2- toward rare earth ions was discussed to play a critical role in phase selection, and the t-phase can only be fabricated at pH ∼ 6-8 with the assistance of Mal2-. The optimal Eu3+ content for luminescence was determined to be ∼5 at% under the VO43- → Eu3+ energy transfer mechanism. Experimental comparison showed that t-(La0.95Eu0.05)VO4 (λex = 275 nm, λem = 620 nm) emits ∼5.3 times as strong as m-(La0.95Eu0.05)VO4 does (λex = 313 nm, λem = 616 nm), while theoretical analysis revealed that the 5D0 level of Eu3+ has a quantum efficiency of ∼80% for the former and ∼70% for the latter. Besides, the t- and m-(La0.95Eu0.05)VO4 nanocrystal phosphors were analyzed to have fluorescence lifetimes of ∼1.53 ± 0.01 and 2.28 ± 0.01 ms for their 620 and 616 nm red emissions, respectively.
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Affiliation(s)
- Sai Huang
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China and Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
| | - Junqing Xiahou
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Qi Zhu
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China
| | - Toshiaki Takei
- International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan
| | - Byung-Nam Kim
- Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
| | - Ji-Guang Li
- Research Center for Functional Materials, National Institute for Materials Science, Namiki 1-1, Tsukuba, Ibaraki 305-0044, Japan.
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Shi H, Yang J, Yu Z, Song Y, Bun Pun EY, Zhao X, Lin H. Wide visible-range fluorescence of Eu 3+ located in the macroscopic bi-layer ceramic/glass composite. RSC Adv 2020; 10:19474-19481. [PMID: 35515427 PMCID: PMC9054051 DOI: 10.1039/d0ra01236j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 05/06/2020] [Indexed: 11/23/2022] Open
Abstract
The Eu3+ doped fluoride bi-layer ceramic/glass composite (GCZBL-Eu) was prepared by a one-step method and the effective wide visible-range fluorescence was recorded. The de-population rates of the 5D0, 5D1, 5D2, and 5D3 multi-levels in the glass layer (GZBL-Eu) were estimated to be 214, 746, 1163, and 680 s-1, respectively, and that in the ceramic layer (CZBL-Eu) were 211, 730, 1075, and 654 s-1, which implies multi-channel radiative transitions due to the non-radiative relaxation limitation of low OH content and low phonon energy. Simultaneously, the quantum efficiencies of the 5D0 levels in GZBL-Eu and CZBL-Eu were as high as 98.5% and 94.8%, respectively, thus demonstrating the effectiveness of the radiative transition emissions from Eu3+. Besides, GCZBL-Eu with the glass forming layer increases the emission intensity by 24% compared to CZBL-Eu, which is attributed to the multiple-cycle reflection in the composite structure of the glass-ceramic transition region, and the color coordinates of CZBL-Eu (0.483, 0.385) and GCZBL-Eu (0.469, 0.389) show that they can release yellowish-white light. The hetero-structured GCZBL-Eu provides a new approach for laser lighting, fluorescent display, and up-conversion applications.
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Affiliation(s)
- Haifeng Shi
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
| | - Jiaxin Yang
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
| | - Zhimin Yu
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
| | - Yu Song
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
| | - Edwin Yue Bun Pun
- Department of Electronical Engineering and State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong P. R. China
| | - Xin Zhao
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
| | - Hai Lin
- School of Textile and Material Engineering, Dalian Polytechnic University Dalian 116034 P. R. China
- Department of Electronical Engineering and State Key Laboratory of Terahertz and Millimeter Waves, City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong P. R. China
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Botella P, Enrichi F, Vomiero A, Muñoz-Santiuste JE, Garg AB, Arvind A, Manjón FJ, Segura A, Errandonea D. Investigation on the Luminescence Properties of InMO 4 (M = V 5+, Nb 5+, Ta 5+) Crystals Doped with Tb 3+ or Yb 3+ Rare Earth Ions. ACS OMEGA 2020; 5:2148-2158. [PMID: 32064375 PMCID: PMC7016905 DOI: 10.1021/acsomega.9b02862] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/16/2019] [Indexed: 06/03/2023]
Abstract
We explore the potential of Tb- and Yb-doped InVO4, InTaO4, and InNbO4 for applications as phosphors for light-emitting sources. Doping below 0.2% barely change the crystal structure and Raman spectrum but provide optical excitation and emission properties in the visible and near-infrared (NIR) spectral regions. From optical measurements, the energy of the first/second direct band gaps was determined to be 3.7/4.1 eV in InVO4, 4.7/5.3 in InNbO4, and 5.6/6.1 eV in InTaO4. In the last two cases, these band gaps are larger than the fundamental band gap (being indirect gap materials), while for InVO4, a direct band gap semiconductor, the fundamental band gap is at 3.7 eV. As a consequence, this material shows a strong self-activated photoluminescence centered at 2.2 eV. The other two materials have a weak self-activated signal at 2.2 and 2.9 eV. We provide an explanation for the origin of these signals taking into account the analysis of the polyhedral coordination around the pentavalent cations (V, Nb, and Ta). Finally, the characteristic green (5D4 → 7F J ) and NIR (2F5/2 → 2F7/2) emissions of Tb3+ and Yb3+ have been analyzed and explained.
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Affiliation(s)
- Pablo Botella
- Department of Engineering
Sciences and Mathematics, Luleå University
of Technology, SE-97187 Luleå, Sweden
| | - Francesco Enrichi
- Department of Engineering
Sciences and Mathematics, Luleå University
of Technology, SE-97187 Luleå, Sweden
- Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, via Torino 155, 30172 Venezia, Italy
| | - Alberto Vomiero
- Department of Engineering
Sciences and Mathematics, Luleå University
of Technology, SE-97187 Luleå, Sweden
- Department of Molecular Sciences and Nanosystems, Ca’ Foscari University of Venice, via Torino 155, 30172 Venezia, Italy
| | - Juan E. Muñoz-Santiuste
- Departamento de Física,
MALTA Consolider Team, Escuela Politécnica Superior, Universidad Carlos III de Madrid, Avenida de la Universidad 30, E-28913 Leganés, Spain
| | - Alka B. Garg
- High Pressure and Synchrotron Radiation Physics Division and Process Development
Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Ananthanarayanan Arvind
- High Pressure and Synchrotron Radiation Physics Division and Process Development
Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Francisco J. Manjón
- Instituto de Diseño para la Fabricación
y Producción Automatizada, MALTA Consolider Team, Universitat Politècnica de València, Camí de Vera s/n, 46022 València, Spain
| | - Alfredo Segura
- Departamento de Física Aplicada-ICMUV, Universidad de Valencia, MALTA Consolider Team, Edificio de Investigación, C. Dr. Moliner 50, 46100 Burjassot, Spain
| | - Daniel Errandonea
- Departamento de Física Aplicada-ICMUV, Universidad de Valencia, MALTA Consolider Team, Edificio de Investigación, C. Dr. Moliner 50, 46100 Burjassot, Spain
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