Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts
In this study, magnetic CuFe<sub>2</sub>O<sub>4</sub>, MgFe<sub>2</sub>O<sub>4</sub>, and ZnFe<sub>2</sub>O<sub>4</sub> nanosphere photocatalysts were prepared by the sol–gel method at 300 °C, 400 °C, and 500 °C, respectively (n...
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MDPI AG
2023-10-01
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| author | Xianyong Guo Fan Gao Haoxuan Cui Jiaxuan Liu Hairong Wang Lixin Liang Yinghai Wu Li Wan Jing Wang Cuiya Zhang Guangjing Xu |
| author_facet | Xianyong Guo Fan Gao Haoxuan Cui Jiaxuan Liu Hairong Wang Lixin Liang Yinghai Wu Li Wan Jing Wang Cuiya Zhang Guangjing Xu |
| author_sort | Xianyong Guo |
| collection | DOAJ |
| description | In this study, magnetic CuFe<sub>2</sub>O<sub>4</sub>, MgFe<sub>2</sub>O<sub>4</sub>, and ZnFe<sub>2</sub>O<sub>4</sub> nanosphere photocatalysts were prepared by the sol–gel method at 300 °C, 400 °C, and 500 °C, respectively (named as CF300, CF400, CF500, MF300, MF400, MF500, ZF300, ZF400, and ZF500). The characterization by X-ray diffraction (XRD) revealed that the optimal calcination temperature was 400 °C. Then, CF400, MF400, and ZF400 were used to treat high-concentration ammonia nitrogen wastewater (HCAW, 1000 mg/L) at different pH levels. The result showed that the optimal pH for CF400, MF400 and ZF400 to degrade HCAW was 9.0, and CF400 required a shorter illumination time (80 min) than MF400 and ZF400 (120 min) to completely remove ammonia nitrogen from HCAW. However, CF400 was unstable and decomposed, and a blue substance was observed during the magnetic recovery experiment. The recovery rate of ZF400 (66.7%) was higher than MF400 (53.2%) with no decomposition phenomenon, and the ammonia nitrogen removal rate of ZF400 remained above 90% after five cycles. Additionally, the ammonia nitrogen removal rate of ZF400 could reach 80.2% when the ammonia nitrogen concentration was as high as 5000 mg/L. Therefore, compared with CF400 and MF400, ZF400 was more suitable for treating HCAW. |
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| last_indexed | 2024-03-10T20:49:10Z |
| publishDate | 2023-10-01 |
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| series | Water |
| spelling | doaj.art-c47e58302d4148a6902e8e2508638e882023-11-19T18:30:39ZengMDPI AGWater2073-44412023-10-011520363810.3390/w15203638Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere PhotocatalystsXianyong Guo0Fan Gao1Haoxuan Cui2Jiaxuan Liu3Hairong Wang4Lixin Liang5Yinghai Wu6Li Wan7Jing Wang8Cuiya Zhang9Guangjing Xu10College of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, ChinaShihezi Tai’an Construction and Engineering Company, Shihezi 832000, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine and Civil Engineering, Dalian Ocean University, Dalian 116023, ChinaCollege of Marine Technology and Environment, Dalian Ocean University, Dalian 116023, ChinaIn this study, magnetic CuFe<sub>2</sub>O<sub>4</sub>, MgFe<sub>2</sub>O<sub>4</sub>, and ZnFe<sub>2</sub>O<sub>4</sub> nanosphere photocatalysts were prepared by the sol–gel method at 300 °C, 400 °C, and 500 °C, respectively (named as CF300, CF400, CF500, MF300, MF400, MF500, ZF300, ZF400, and ZF500). The characterization by X-ray diffraction (XRD) revealed that the optimal calcination temperature was 400 °C. Then, CF400, MF400, and ZF400 were used to treat high-concentration ammonia nitrogen wastewater (HCAW, 1000 mg/L) at different pH levels. The result showed that the optimal pH for CF400, MF400 and ZF400 to degrade HCAW was 9.0, and CF400 required a shorter illumination time (80 min) than MF400 and ZF400 (120 min) to completely remove ammonia nitrogen from HCAW. However, CF400 was unstable and decomposed, and a blue substance was observed during the magnetic recovery experiment. The recovery rate of ZF400 (66.7%) was higher than MF400 (53.2%) with no decomposition phenomenon, and the ammonia nitrogen removal rate of ZF400 remained above 90% after five cycles. Additionally, the ammonia nitrogen removal rate of ZF400 could reach 80.2% when the ammonia nitrogen concentration was as high as 5000 mg/L. Therefore, compared with CF400 and MF400, ZF400 was more suitable for treating HCAW.https://www.mdpi.com/2073-4441/15/20/3638high-concentration ammonia nitrogenphotocatalystferritestabilityrecovery rate |
| spellingShingle | Xianyong Guo Fan Gao Haoxuan Cui Jiaxuan Liu Hairong Wang Lixin Liang Yinghai Wu Li Wan Jing Wang Cuiya Zhang Guangjing Xu Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts Water high-concentration ammonia nitrogen photocatalyst ferrite stability recovery rate |
| title | Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts |
| title_full | Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts |
| title_fullStr | Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts |
| title_full_unstemmed | Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts |
| title_short | Visible-Light-Driven Photocatalytic Degradation of High-Concentration Ammonia Nitrogen Wastewater by Magnetic Ferrite Nanosphere Photocatalysts |
| title_sort | visible light driven photocatalytic degradation of high concentration ammonia nitrogen wastewater by magnetic ferrite nanosphere photocatalysts |
| topic | high-concentration ammonia nitrogen photocatalyst ferrite stability recovery rate |
| url | https://www.mdpi.com/2073-4441/15/20/3638 |
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