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Ha Luu TV, Dao NN, Le Pham HA, Nguyen QB, Nguyen VC, Dang PH. One-step hydrothermal preparation of Ta-doped ZnO nanorods for improving decolorization efficiency under visible light. RSC Adv 2023; 13:5208-5218. [PMID: 36777945 PMCID: PMC9912144 DOI: 10.1039/d2ra07655a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 01/19/2023] [Indexed: 02/12/2023] Open
Abstract
In this work, Ta-doped ZnO (Ta-ZnO) nanomaterials were synthesized by the hydrothermal method at different temperatures (110, 150, and 170 °C) for the photodegradation of methylene blue (MB) under visible light. Ta doping significantly affects the crystal defects, optical properties, and MB photocatalytic efficiency of ZnO materials. The optical absorption edge of Ta-ZnO 150 was redshifted compared to undoped ZnO, correlating to bandgap narrowing (E gTa-ZnO = 2.92 eV; E gZnO = 3.07 eV), implying that Ta doped ZnO is capable of absorbing visible light. Besides, Ta-doping was the reason for enhanced blue light emission in the photoluminescence spectrum, which is related to the oxygen defect V 0 O. It is also observed in the XPS spectra, where the percentage of oxygen in the oxygen-deficient regions (O531.5 eV) of Ta-ZnO150 is higher than that of ZnO150. It is an important factor in enhancing ZnO's photocatalytic efficiency. The MB degradation efficiency of Ta-doped ZnO reached the highest for Ta-ZnO 150 and was 2.5 times higher than ZnO under a halogen lamp (HL). Notably, the influence of hydrothermal temperature on the structural, morphological, and photoelectrochemical properties was discussed in detail. As a result, the optimal hydrothermal temperature for synthesizing the nanorod is 150 °C. Furthermore, photocatalytic experiments were also performed under simulated sunlight and natural sunlight. The nature of the photo-oxidative degradation of MB was also investigated.
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Affiliation(s)
- Thi Viet Ha Luu
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh City 700000 Vietnam
| | - Ngoc Nhiem Dao
- Institute of Materials Science, Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi100000Vietnam,Graduate University of Science and Technology, Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi100000Vietnam
| | - Hoang Ai Le Pham
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh City 700000 Vietnam
| | - Quang Bac Nguyen
- Institute of Materials Science, Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi100000Vietnam,Graduate University of Science and Technology, Vietnam Academy of Science and Technology18 Hoang Quoc VietHanoi100000Vietnam
| | - Van Cuong Nguyen
- Faculty of Chemical Engineering, Industrial University of Ho Chi Minh City Ho Chi Minh City 700000 Vietnam
| | - Phuc Huu Dang
- Faculty of Fundamental Science, Industrial University of Ho Chi Minh City Ho Chi Minh City 700000 Vietnam
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Serrano A, Caballero-Calero O, García MÁ, Lazić S, Carmona N, Castro GR, Martín-González M, Fernández JF. Cold sintering process of ZnO ceramics: Effect of the nanoparticle/microparticle ratio. Ann Ital Chir 2020. [DOI: 10.1016/j.jeurceramsoc.2020.05.059] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Arias-Serrano BI, Xie W, Aguirre MH, Tobaldi DM, Sarabando AR, Rasekh S, Mikhalev SM, Frade JR, Weidenkaff A, Kovalevsky AV. Exploring Tantalum as a Potential Dopant to Promote the Thermoelectric Performance of Zinc Oxide. MATERIALS 2019; 12:ma12132057. [PMID: 31248011 PMCID: PMC6651819 DOI: 10.3390/ma12132057] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 06/19/2019] [Accepted: 06/25/2019] [Indexed: 11/16/2022]
Abstract
Zinc oxide (ZnO) has being recognised as a potentially interesting thermoelectric material, allowing flexible tuning of the electrical properties by donor doping. This work focuses on the assessment of tantalum doping effects on the relevant structural, microstructural, optical and thermoelectric properties of ZnO. Processing of the samples with a nominal composition Zn1-xTaxO by conventional solid-state route results in limited solubility of Ta in the wurtzite structure. Electronic doping is accompanied by the formation of other defects and dislocations as a compensation mechanism and simultaneous segregation of ZnTa2O6 at the grain boundaries. Highly defective structure and partial blocking of the grain boundaries suppress the electrical transport, while the evolution of Seebeck coefficient and band gap suggest that the charge carrier concentration continuously increases from x = 0 to 0.008. Thermal conductivity is almost not affected by the tantalum content. The highest ZT~0.07 at 1175 K observed for Zn0.998Ta0.002O is mainly provided by high Seebeck coefficient (-464 V/K) along with a moderate electrical conductivity of ~13 S/cm. The results suggest that tantalum may represent a suitable dopant for thermoelectric zinc oxide, but this requires the application of specific processing methods and compositional design to enhance the solubility of Ta in wurtzite lattice.
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Affiliation(s)
- Blanca I Arias-Serrano
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Wenjie Xie
- Materials and Resources, Techn, Universität Darmstadt, Alarich-Weiss Str.2, DE-64287 Darmstadt, Germany.
| | - Myriam H Aguirre
- Condensed Matter Physics Department, University of Zaragoza and Institute of Material Science of Aragón, ICMA-CSIC, E-50018 Zaragoza, Spain.
- Advanced Microscopy Laboratory, I+D Building-Campus Río Ebro, C/Mariano Esquillor s/n, 50018 Zaragoza, Spain.
| | - David M Tobaldi
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Artur R Sarabando
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Shahed Rasekh
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
- i3N, Physics Department, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Sergey M Mikhalev
- TEMA-NRD, Mechanical Engineering Department, Aveiro Institute of Nanotechnology (AIN), University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Jorge R Frade
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Anke Weidenkaff
- Materials and Resources, Techn, Universität Darmstadt, Alarich-Weiss Str.2, DE-64287 Darmstadt, Germany.
| | - Andrei V Kovalevsky
- CICECO-Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, 3810-193 Aveiro, Portugal.
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