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Pham MT, Tran DPH, Bui XT, You SJ. Rapid fabrication of MgO@g-C 3N 4 heterojunctions for photocatalytic nitric oxide removal. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2022; 13:1141-1154. [PMID: 36320428 PMCID: PMC9592965 DOI: 10.3762/bjnano.13.96] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 10/06/2022] [Indexed: 06/16/2023]
Abstract
Nitric oxide (NO) is an air pollutant impacting the environment, human health, and other biotas. Among the technologies to treat NO pollution, photocatalytic oxidation under visible light is considered an effective means. This study describes photocatalytic oxidation to degrade NO under visible light with the support of a photocatalyst. MgO@g-C3N4 heterojunction photocatalysts were synthesized by one-step pyrolysis of MgO and urea at 550 °C for two hours. The photocatalytic NO removal efficiency of the MgO@g-C3N4 heterojunctions was significantly improved and reached a maximum value of 75.4% under visible light irradiation. Differential reflectance spectroscopy (DRS) was used to determine the optical properties and bandgap energies of the material. The bandgap of the material decreases with increasing amounts of MgO. The photoluminescence spectra indicate that the recombination of electron-hole pairs is hindered by doping MgO onto g-C3N4. Also, NO conversion, DeNOx index, apparent quantum efficiency, trapping tests, and electron spin resonance measurements were carried out to understand the photocatalytic mechanism of the materials. The high reusability of the MgO@g-C3N4 heterojunction was shown by a five-cycle recycling test. This study provides a simple way to synthesize photocatalytic heterojunction materials with high reusability and the potential of heterojunction photocatalysts in the field of environmental remediation.
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Affiliation(s)
- Minh-Thuan Pham
- Department of Civil Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan 32023, Taiwan
| | - Duyen P H Tran
- Department of Civil Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan 32023, Taiwan
| | - Xuan-Thanh Bui
- Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City 700000, Viet Nam
| | - Sheng-Jie You
- Department of Environmental Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
- Center for Environmental Risk Management, Chung Yuan Christian University, Taoyuan 32023, Taiwan
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Solar-Energy-Driven Cu-ZnO/TiO2 Nanocomposite Photocatalyst for the Rapid Degradation of Congo Red Azo Dye. Catalysts 2022. [DOI: 10.3390/catal12060605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
This study effectively demonstrates the sonochemical synthesis of visible-light-responsive Cu-ZnO/TiO2 ternary Z-scheme heterojunction nanocomposite photocatalyst. The as-prepared photocatalyst was comprehensively characterized by techniques including high-resolution transmission electron microscopy (HRTEM), field emission scanning electron microscopy (FE-SEM) with energy dispersive X-ray analysis (EDX) and elemental dot mapping, X-ray diffraction (XRD), UV-Vis-diffuse reflectance spectroscopy (UV-Vis-DRS), Brunauer–Emmett–Teller (BET) surface area, and Fourier-transform infrared spectroscopy (FTIR). The photocatalytic activity of the Cu-ZnO/TiO2 nanocomposite photocatalyst was assessed for the degradation of Congo red (CR), an azo dye, under direct sunlight. The pseudo-first-order rate constant for CR degradation was found to be 0.09 min−1. The outcome implies that the synthesised nanocomposite photocatalyst demonstrates excellent photocatalytic activity under direct sunlight as 98% degradation of CR dye was achieved in approximately 20 min using the Cu-ZnO/TiO2 nanocomposite photocatalyst. Furthermore, its high recoverability and reusability of five times indicate its excellent catalytic potential.
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Wang Y, Chang F, Wei Z, Yang C, Liu DG, Yan T, Pang Q, Chen S. Photocatalytic NO removal by WO 3 samples prepared via a ball milling treatment under different parameters. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2068586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Yuqing Wang
- School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai, P.R. China
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Fei Chang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Zhixun Wei
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Cheng Yang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Deng-guo Liu
- Shanghai Environmental Monitoring Center, Shanghai, P.R. China
| | - Tianyi Yan
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Qingyun Pang
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, P.R. China
| | - Shengwen Chen
- School of Environmental and Materials Engineering, Shanghai Polytechnic University, Shanghai, P.R. China
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Van Pham V, Truong TK, Le HV, Nguyen HT, Tong HD, Cao TM. Enhancing Green Product Generation of Photocatalytic NO Oxidation: A Case of WO 3 Nanoplate/g-C 3N 4 S-Scheme Heterojunction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:4138-4146. [PMID: 35324210 DOI: 10.1021/acs.langmuir.2c00371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nitric oxide (NO) removal by photocatalytic oxidation over g-C3N4 has achieved more efficient results. However, there is a concern about the high NO-to-NO2 conversion yield of products, which is not suitable for the photocatalytic NO reaction. In this study, we modify g-C3N4 by WO3 nanoplates for the first time for photocatalytic NO oxidation over a WO3/g-C3N4 composite to enhance the green product selectivity under atmospheric conditions. The results indicate that the photocatalytic efficiency for NO removal by the WO3/g-C3N4 composite is drastically improved and achieves 52.5%, which is approximately 2.1 times higher than that of pure g-C3N4. Significantly, the green product (NO3-) selectivity of the WO3/g-C3N4 composite is 8.7 times higher than that of pure g-C3N4, and the selectivity remained high even after five cycles of photocatalytic tests. We also conclude that the enhanced green product selectivity of photocatalytic NO oxidation by the WO3/g-C3N4 composite is due to the separation and acceleration of the photogenerated charges of the WO3/g-C3N4 S-scheme heterojunction.
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Affiliation(s)
- Viet Van Pham
- University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 700000, Vietnam
- Vietnam National University Ho Chi Minh City, Thu Duc, Ho Chi Minh City 700000, Vietnam
| | - Thao Kim Truong
- University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 700000, Vietnam
- Vietnam National University Ho Chi Minh City, Thu Duc, Ho Chi Minh City 700000, Vietnam
| | - Hai Viet Le
- University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 700000, Vietnam
- Vietnam National University Ho Chi Minh City, Thu Duc, Ho Chi Minh City 700000, Vietnam
| | - Hoang Thai Nguyen
- University of Science, VNU-HCM, 227 Nguyen Van Cu Street, District 5, Ho Chi Minh City 700000, Vietnam
- Vietnam National University Ho Chi Minh City, Thu Duc, 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 7500, Vietnam
| | - Thi Minh Cao
- HUTECH University, 475A Dien Bien Phu Street, Binh Thanh District, Ho Chi Minh City 700000, Vietnam
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