Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway
A highly efficient and stable CeO2-based material has been developed for photocatalytic degradation of antibiotics in water. In this study, we investigated the defects due to metal-support interaction between Ag and CeO2 in the Ag/CeO2 nanocomposites. Here we introduced oxygen vacancies in CeO2 by i...
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Elsevier
2025-03-01
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| Series: | Chemical Engineering Journal Advances |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666821125000031 |
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| author | Ajit Kumar Dhanka Emerson C. Kohlrausch Raghabendra Samantray Vinod Kumar Balaram Pani Nityananda Agasti |
| author_facet | Ajit Kumar Dhanka Emerson C. Kohlrausch Raghabendra Samantray Vinod Kumar Balaram Pani Nityananda Agasti |
| author_sort | Ajit Kumar Dhanka |
| collection | DOAJ |
| description | A highly efficient and stable CeO2-based material has been developed for photocatalytic degradation of antibiotics in water. In this study, we investigated the defects due to metal-support interaction between Ag and CeO2 in the Ag/CeO2 nanocomposites. Here we introduced oxygen vacancies in CeO2 by incorporating Ag on the surface of CeO2. Notably, the addition of Ag to CeO2 reduces the band gap energy to 2.90 eV, accompanied by an increase in Ce3+ content which is correlated with an increase in oxygen vacancies. X-ray photoelectron spectroscopy (XPS), Raman and EPR studies substantiated the increase in surface oxygen vacancies in CeO2 induced by the interaction between Ag and CeO2. Oxygen vacancies in Ag/CeO2 act as trapping sites for photogenerated electrons and successfully restrain the recombination of photogenerated electron and hole pairs, thereby exhibiting improved catalytic activity of Ag/CeO2 nanocomposites. Ag/CeO2 nanocomposites exhibited better catalytic performance than pristine CeO2, which is attributed to the enhanced oxygen vacancies in the nanocomposites. We investigated the effect of silver (Ag) on increasing oxygen vacancies in Ag/CeO2.Trapping experiments were conducted to identify the reactive species participating in the photocatalytic degradation process. A plausible mechanism is proposed based on critical analysis of the results from the characterization techniques of the nanocomposites and photocatalytic experiments. The possible degradation pathways for Ciprofloxacin along with the degradation intermediates have been proposed based on High resolution mass spectroscopy (HRMS) analysis. This study provides insights on structural characteristics of defective CeO2, in-depth photocatalytic mechanism and degradation pathway of ciprofloxacin, that could facilitate the exploration of other ceria-based nanocomposites for catalytic applications. |
| format | Article |
| id | doaj-art-388e506768604118ab4d020f484a9673 |
| institution | Kabale University |
| issn | 2666-8211 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Chemical Engineering Journal Advances |
| spelling | doaj-art-388e506768604118ab4d020f484a96732025-02-03T04:17:04ZengElsevierChemical Engineering Journal Advances2666-82112025-03-0121100706Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathwayAjit Kumar Dhanka0Emerson C. Kohlrausch1Raghabendra Samantray2Vinod Kumar3Balaram Pani4Nityananda Agasti5Department of Chemistry, University of Delhi, North Campus, Delhi 110007, IndiaSchool of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UKSchool of Applied Sciences, KIIT University, Bhubaneswar 751024, IndiaSpecial Centre for Nano Science, Jawaharlal Nehru University, Delhi 110067, IndiaDepartment of Chemistry, Bhashkaracharya College of Applied Sciences, University of Delhi, Dwarka, New Delhi 110075, IndiaDepartment of Chemistry, Deen Dayal Upadhyaya College, University of Delhi, Dwarka, New Delhi 110078, India; Corresponding author at: Department of Chemistry, Deen Dayal Upadhyaya College, University of Delhi, Sector-3, Dwarka, New Delhi 110078, India.A highly efficient and stable CeO2-based material has been developed for photocatalytic degradation of antibiotics in water. In this study, we investigated the defects due to metal-support interaction between Ag and CeO2 in the Ag/CeO2 nanocomposites. Here we introduced oxygen vacancies in CeO2 by incorporating Ag on the surface of CeO2. Notably, the addition of Ag to CeO2 reduces the band gap energy to 2.90 eV, accompanied by an increase in Ce3+ content which is correlated with an increase in oxygen vacancies. X-ray photoelectron spectroscopy (XPS), Raman and EPR studies substantiated the increase in surface oxygen vacancies in CeO2 induced by the interaction between Ag and CeO2. Oxygen vacancies in Ag/CeO2 act as trapping sites for photogenerated electrons and successfully restrain the recombination of photogenerated electron and hole pairs, thereby exhibiting improved catalytic activity of Ag/CeO2 nanocomposites. Ag/CeO2 nanocomposites exhibited better catalytic performance than pristine CeO2, which is attributed to the enhanced oxygen vacancies in the nanocomposites. We investigated the effect of silver (Ag) on increasing oxygen vacancies in Ag/CeO2.Trapping experiments were conducted to identify the reactive species participating in the photocatalytic degradation process. A plausible mechanism is proposed based on critical analysis of the results from the characterization techniques of the nanocomposites and photocatalytic experiments. The possible degradation pathways for Ciprofloxacin along with the degradation intermediates have been proposed based on High resolution mass spectroscopy (HRMS) analysis. This study provides insights on structural characteristics of defective CeO2, in-depth photocatalytic mechanism and degradation pathway of ciprofloxacin, that could facilitate the exploration of other ceria-based nanocomposites for catalytic applications.http://www.sciencedirect.com/science/article/pii/S2666821125000031Ag/CeO2CeriaMetal-support interactionDefectsOxygen vacanciesAntibiotics |
| spellingShingle | Ajit Kumar Dhanka Emerson C. Kohlrausch Raghabendra Samantray Vinod Kumar Balaram Pani Nityananda Agasti Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway Chemical Engineering Journal Advances Ag/CeO2 Ceria Metal-support interaction Defects Oxygen vacancies Antibiotics |
| title | Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway |
| title_full | Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway |
| title_fullStr | Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway |
| title_full_unstemmed | Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway |
| title_short | Harnessing defects in Ag/CeO2 for enhanced photocatalytic degradation of antibiotic in water: Structural characteristics, in-depth insights on mechanism, degradation pathway |
| title_sort | harnessing defects in ag ceo2 for enhanced photocatalytic degradation of antibiotic in water structural characteristics in depth insights on mechanism degradation pathway |
| topic | Ag/CeO2 Ceria Metal-support interaction Defects Oxygen vacancies Antibiotics |
| url | http://www.sciencedirect.com/science/article/pii/S2666821125000031 |
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