Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol
The photocatalytic degradation of organic pollutants is an effective method of controlling environmental pollution. ZnO nanoparticles (ZnO NPs) were prepared by the solvothermal method and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (X...
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MDPI AG
2021-11-01
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| author | Ying Wang Chuanxi Yang Yonglin Liu Yuqi Fan Feng Dang Yang Qiu Huimin Zhou Weiliang Wang Yuzhen Liu |
| author_facet | Ying Wang Chuanxi Yang Yonglin Liu Yuqi Fan Feng Dang Yang Qiu Huimin Zhou Weiliang Wang Yuzhen Liu |
| author_sort | Ying Wang |
| collection | DOAJ |
| description | The photocatalytic degradation of organic pollutants is an effective method of controlling environmental pollution. ZnO nanoparticles (ZnO NPs) were prepared by the solvothermal method and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS). The results showed that the ZnO NPs had a uniform size of 25–40 nm, hexagonal wurtzite structure, and a band gap of 2.99 eV. The photocatalytic degradation of methyl orange (MO) and <i>p</i>-nitrophenol (PNP) was used as a model reaction to evaluate the photocatalytic activity of ZnO NPs. The photocatalytic degradation rates (pseudo-first-order kinetics) of MO and PNP were 92% (0.0128 min<sup>−</sup><sup>1</sup>) and 56.2% (0.0042 min<sup>−</sup><sup>1</sup>), respectively, with a 25 W ultraviolet lamp, MO/PNP concentration = 20 mg/L, ZnO NPs dose = 1.5 g/L, and time = 180 min. The photocatalytic mechanism of ZnO NPs and degradation pathways of MO and PNP were also proposed. The results provide valuable information and guidance for the treatment of wastewater via photocatalytic methods. |
| first_indexed | 2024-03-10T04:58:25Z |
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| id | doaj.art-a7ed9b5fdc834b619b2e09a334c2b285 |
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| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T04:58:25Z |
| publishDate | 2021-11-01 |
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| series | Water |
| spelling | doaj.art-a7ed9b5fdc834b619b2e09a334c2b2852023-11-23T02:00:24ZengMDPI AGWater2073-44412021-11-011322322410.3390/w13223224Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-NitrophenolYing Wang0Chuanxi Yang1Yonglin Liu2Yuqi Fan3Feng Dang4Yang Qiu5Huimin Zhou6Weiliang Wang7Yuzhen Liu8Institute of Environment and Ecology, Shandong Normal University, Jinan 250358, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaInstitute of Environment and Ecology, Shandong Normal University, Jinan 250358, ChinaKey Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Shandong University, Jinan 250061, ChinaInstitute of Environment and Ecology, Shandong Normal University, Jinan 250358, ChinaInstitute of Environment and Ecology, Shandong Normal University, Jinan 250358, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaCollege of Geography and Environment, Shandong Normal University, Jinan 250358, ChinaThe photocatalytic degradation of organic pollutants is an effective method of controlling environmental pollution. ZnO nanoparticles (ZnO NPs) were prepared by the solvothermal method and characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV–visible diffuse reflectance spectroscopy (UV–Vis DRS). The results showed that the ZnO NPs had a uniform size of 25–40 nm, hexagonal wurtzite structure, and a band gap of 2.99 eV. The photocatalytic degradation of methyl orange (MO) and <i>p</i>-nitrophenol (PNP) was used as a model reaction to evaluate the photocatalytic activity of ZnO NPs. The photocatalytic degradation rates (pseudo-first-order kinetics) of MO and PNP were 92% (0.0128 min<sup>−</sup><sup>1</sup>) and 56.2% (0.0042 min<sup>−</sup><sup>1</sup>), respectively, with a 25 W ultraviolet lamp, MO/PNP concentration = 20 mg/L, ZnO NPs dose = 1.5 g/L, and time = 180 min. The photocatalytic mechanism of ZnO NPs and degradation pathways of MO and PNP were also proposed. The results provide valuable information and guidance for the treatment of wastewater via photocatalytic methods.https://www.mdpi.com/2073-4441/13/22/3224ZnOsolvothermalmethyl orange<i>p</i>-nitrophenol |
| spellingShingle | Ying Wang Chuanxi Yang Yonglin Liu Yuqi Fan Feng Dang Yang Qiu Huimin Zhou Weiliang Wang Yuzhen Liu Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol Water ZnO solvothermal methyl orange <i>p</i>-nitrophenol |
| title | Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol |
| title_full | Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol |
| title_fullStr | Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol |
| title_full_unstemmed | Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol |
| title_short | Solvothermal Synthesis of ZnO Nanoparticles for Photocatalytic Degradation of Methyl Orange and <i>p</i>-Nitrophenol |
| title_sort | solvothermal synthesis of zno nanoparticles for photocatalytic degradation of methyl orange and i p i nitrophenol |
| topic | ZnO solvothermal methyl orange <i>p</i>-nitrophenol |
| url | https://www.mdpi.com/2073-4441/13/22/3224 |
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