Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System
In order to improve the catalytic activity of cobalt molybdate (CoMoO<sub>4</sub>), a PDS-activated and UV-vis assisted system was constructed. CoMoO<sub>4</sub> was prepared by coprecipitation and calcination, and characterized by XRD, FTIR, Raman, SEM, TEM, XPS, TGA Zeta po...
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/1420-3049/27/24/8642 |
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| author | Huimin Zhou Yang Qiu Chuanxi Yang Jinqiu Zang Zihan Song Tingzheng Yang Jinzhi Li Yuqi Fan Feng Dang Weiliang Wang |
| author_facet | Huimin Zhou Yang Qiu Chuanxi Yang Jinqiu Zang Zihan Song Tingzheng Yang Jinzhi Li Yuqi Fan Feng Dang Weiliang Wang |
| author_sort | Huimin Zhou |
| collection | DOAJ |
| description | In order to improve the catalytic activity of cobalt molybdate (CoMoO<sub>4</sub>), a PDS-activated and UV-vis assisted system was constructed. CoMoO<sub>4</sub> was prepared by coprecipitation and calcination, and characterized by XRD, FTIR, Raman, SEM, TEM, XPS, TGA Zeta potential, BET, and UV-Vis DRS. The results showed that the morphology of the CoMoO<sub>4</sub> nanolumps consisted of stacked nanosheets. XRD indicated the monoclinic structures with C2/m (C<sup>3</sup><sub>2h</sub>, #12) space group, which belong to α-CoMoO<sub>4</sub>, and both Co<sup>2+</sup> and Mo<sup>6+</sup> ions occupy distorted octahedral sites. The pH of the isoelectric point (pHIEP) of CMO-8 at pH = 4.88 and the band gap of CoMoO<sub>4</sub> was 1.92 eV. The catalytic activity of CoMoO<sub>4</sub> was evaluated by photo-Fenton degradation of Congo red (CR). The catalytic performance was affected by calcination temperature, catalyst dosage, PDS dosage, and pH. Under the best conditions (0.8 g/L CMO-8, PDS 1 mL), the degradation efficiency of CR was 96.972%. The excellent catalytic activity of CoMoO<sub>4</sub> was attributed to the synergistic effect of photo catalysis and CoMoO<sub>4</sub>-activated PDS degradation. The capture experiments and the ESR showed that superoxide radical (·O<sub>2</sub><sup>−</sup>), singlet oxygen (<sup>1</sup>O<sub>2</sub>), hole (h<sup>+</sup>), sulfate (SO<sub>4</sub><sup>−</sup>·), and hydroxyl (·OH<sup>−</sup>) were the main free radicals leading to the degradation of CR. The results can provide valuable information and support for the design and application of high-efficiency transition metal oxide catalysts. |
| first_indexed | 2024-03-09T16:03:25Z |
| format | Article |
| id | doaj.art-91ed80cdede24dbc947f2c62219161f8 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T16:03:25Z |
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| series | Molecules |
| spelling | doaj.art-91ed80cdede24dbc947f2c62219161f82023-11-24T16:54:57ZengMDPI AGMolecules1420-30492022-12-012724864210.3390/molecules27248642Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton SystemHuimin Zhou0Yang Qiu1Chuanxi Yang2Jinqiu Zang3Zihan Song4Tingzheng Yang5Jinzhi Li6Yuqi Fan7Feng Dang8Weiliang Wang9Institute 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, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaMiddle School of Gantian, Chenzhou 424400, 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, ChinaSchool of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266525, ChinaIn order to improve the catalytic activity of cobalt molybdate (CoMoO<sub>4</sub>), a PDS-activated and UV-vis assisted system was constructed. CoMoO<sub>4</sub> was prepared by coprecipitation and calcination, and characterized by XRD, FTIR, Raman, SEM, TEM, XPS, TGA Zeta potential, BET, and UV-Vis DRS. The results showed that the morphology of the CoMoO<sub>4</sub> nanolumps consisted of stacked nanosheets. XRD indicated the monoclinic structures with C2/m (C<sup>3</sup><sub>2h</sub>, #12) space group, which belong to α-CoMoO<sub>4</sub>, and both Co<sup>2+</sup> and Mo<sup>6+</sup> ions occupy distorted octahedral sites. The pH of the isoelectric point (pHIEP) of CMO-8 at pH = 4.88 and the band gap of CoMoO<sub>4</sub> was 1.92 eV. The catalytic activity of CoMoO<sub>4</sub> was evaluated by photo-Fenton degradation of Congo red (CR). The catalytic performance was affected by calcination temperature, catalyst dosage, PDS dosage, and pH. Under the best conditions (0.8 g/L CMO-8, PDS 1 mL), the degradation efficiency of CR was 96.972%. The excellent catalytic activity of CoMoO<sub>4</sub> was attributed to the synergistic effect of photo catalysis and CoMoO<sub>4</sub>-activated PDS degradation. The capture experiments and the ESR showed that superoxide radical (·O<sub>2</sub><sup>−</sup>), singlet oxygen (<sup>1</sup>O<sub>2</sub>), hole (h<sup>+</sup>), sulfate (SO<sub>4</sub><sup>−</sup>·), and hydroxyl (·OH<sup>−</sup>) were the main free radicals leading to the degradation of CR. The results can provide valuable information and support for the design and application of high-efficiency transition metal oxide catalysts.https://www.mdpi.com/1420-3049/27/24/8642CoMoO<sub>4</sub>PDSCongo redphoto-Fenton |
| spellingShingle | Huimin Zhou Yang Qiu Chuanxi Yang Jinqiu Zang Zihan Song Tingzheng Yang Jinzhi Li Yuqi Fan Feng Dang Weiliang Wang Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System Molecules CoMoO<sub>4</sub> PDS Congo red photo-Fenton |
| title | Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System |
| title_full | Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System |
| title_fullStr | Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System |
| title_full_unstemmed | Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System |
| title_short | Efficient Degradation of Congo Red in Water by UV-Vis Driven CoMoO<sub>4</sub>/PDS Photo-Fenton System |
| title_sort | efficient degradation of congo red in water by uv vis driven comoo sub 4 sub pds photo fenton system |
| topic | CoMoO<sub>4</sub> PDS Congo red photo-Fenton |
| url | https://www.mdpi.com/1420-3049/27/24/8642 |
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