Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass
Improving the photogenerated carrier separation efficiency of individual semiconductor materials has always been a key challenge in photocatalysis. In this study, we synthesized a novel photocatalytic material, N-CQDs/UBWO, in situ by combining nitrogen-doped carbon quantum dots (N-CQDs) derived fro...
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2024-12-01
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| author | Haitao Ren Fan Qi Ke Zhao Du Lv Hao Ma Cheng Ma Mohsen Padervand |
| author_facet | Haitao Ren Fan Qi Ke Zhao Du Lv Hao Ma Cheng Ma Mohsen Padervand |
| author_sort | Haitao Ren |
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| description | Improving the photogenerated carrier separation efficiency of individual semiconductor materials has always been a key challenge in photocatalysis. In this study, we synthesized a novel photocatalytic material, N-CQDs/UBWO, in situ by combining nitrogen-doped carbon quantum dots (N-CQDs) derived from discarded corn stover with ultrathin Bi<sub>2</sub>WO<sub>6</sub> nanosheets (UBWO). Detailed characterization indicates that the random distribution of N-CQDs on the UBWO surface increases the specific surface area of UBWO, which is beneficial for the adsorption and degradation of oxytetracycline (OTC). More importantly, N-CQDs act as electron acceptors, promoting the effective separation of photogenerated charges, prolonging the lifetime of charge carriers in UBWO, and thereby enhancing the degradation efficiency of OTC. As a result, the optimized 3wt%N-CQDs/UBWO could degrade 85% of OTC within 40 min under visible light, with a removal rate four times that of pure Bi<sub>2</sub>WO<sub>6</sub>. The performance of photocatalytic degradation over OTC by 3wt%N-CQDs/UBWO exceeds that of most reported Bi<sub>2</sub>WO<sub>6</sub>-based photocatalysts. The EPR analysis confirmed that ∙O<sub>2</sub><sup>−</sup> and ∙OH are the main active species in the photocatalytic degradation of OTC on 3wt%N-CQDs/UBWO. This study provides insight into designing green, low-cost, and efficient photocatalysts using CQDs derived from waste biomass and the degradation of emerging pollutants like antibiotics. |
| format | Article |
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| language | English |
| publishDate | 2024-12-01 |
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| series | Molecules |
| spelling | doaj-art-81b1d4162fcb49c1ad3575b74a6cff7e2024-12-13T16:28:50ZengMDPI AGMolecules1420-30492024-12-012923572510.3390/molecules29235725Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste BiomassHaitao Ren0Fan Qi1Ke Zhao2Du Lv3Hao Ma4Cheng Ma5Mohsen Padervand6Technological Institute of Materials & Energy Science (TIMES), Xijing University, Xi’an 710123, ChinaState Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300071, ChinaSchool of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi’an 710021, ChinaTechnological Institute of Materials & Energy Science (TIMES), Xijing University, Xi’an 710123, ChinaTechnological Institute of Materials & Energy Science (TIMES), Xijing University, Xi’an 710123, ChinaTechnological Institute of Materials & Energy Science (TIMES), Xijing University, Xi’an 710123, ChinaDepartment of Chemistry, Faculty of Science, University of Maragheh, Maragheh P.O. Box 55181-83111, IranImproving the photogenerated carrier separation efficiency of individual semiconductor materials has always been a key challenge in photocatalysis. In this study, we synthesized a novel photocatalytic material, N-CQDs/UBWO, in situ by combining nitrogen-doped carbon quantum dots (N-CQDs) derived from discarded corn stover with ultrathin Bi<sub>2</sub>WO<sub>6</sub> nanosheets (UBWO). Detailed characterization indicates that the random distribution of N-CQDs on the UBWO surface increases the specific surface area of UBWO, which is beneficial for the adsorption and degradation of oxytetracycline (OTC). More importantly, N-CQDs act as electron acceptors, promoting the effective separation of photogenerated charges, prolonging the lifetime of charge carriers in UBWO, and thereby enhancing the degradation efficiency of OTC. As a result, the optimized 3wt%N-CQDs/UBWO could degrade 85% of OTC within 40 min under visible light, with a removal rate four times that of pure Bi<sub>2</sub>WO<sub>6</sub>. The performance of photocatalytic degradation over OTC by 3wt%N-CQDs/UBWO exceeds that of most reported Bi<sub>2</sub>WO<sub>6</sub>-based photocatalysts. The EPR analysis confirmed that ∙O<sub>2</sub><sup>−</sup> and ∙OH are the main active species in the photocatalytic degradation of OTC on 3wt%N-CQDs/UBWO. This study provides insight into designing green, low-cost, and efficient photocatalysts using CQDs derived from waste biomass and the degradation of emerging pollutants like antibiotics.https://www.mdpi.com/1420-3049/29/23/5725visible-light photocatalysisantibiotic contaminationcarbon quantum dotswaste biomassdegradation mechanism |
| spellingShingle | Haitao Ren Fan Qi Ke Zhao Du Lv Hao Ma Cheng Ma Mohsen Padervand Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass Molecules visible-light photocatalysis antibiotic contamination carbon quantum dots waste biomass degradation mechanism |
| title | Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass |
| title_full | Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass |
| title_fullStr | Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass |
| title_full_unstemmed | Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass |
| title_short | Enhanced Degradation of Oxytetracycline Antibiotic Under Visible Light over Bi<sub>2</sub>WO<sub>6</sub> Coupled with Carbon Quantum Dots Derived from Waste Biomass |
| title_sort | enhanced degradation of oxytetracycline antibiotic under visible light over bi sub 2 sub wo sub 6 sub coupled with carbon quantum dots derived from waste biomass |
| topic | visible-light photocatalysis antibiotic contamination carbon quantum dots waste biomass degradation mechanism |
| url | https://www.mdpi.com/1420-3049/29/23/5725 |
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