Comparison of Ag and AgI-Modified ZnO as Heterogeneous Photocatalysts for Simulated Sunlight Driven Photodegradation of Metronidazole
| Autor: | Huiping Deng, Jun Shi, Jia Liu, Yishuai Pan, Kun Fu, Chao Ding |
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| Rok vydání: | 2020 |
| Předmět: |
reactive oxygen species
Ag/ZnO and AgI/ZnO composite photocatalysts Materials science Radical Ms analysis 02 engineering and technology lcsh:Chemical technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences lcsh:Chemistry metronidazole Reaction rate constant lcsh:QD1-999 Molar ratio Photocatalysis lcsh:TP1-1185 Irradiation Physical and Theoretical Chemistry 0210 nano-technology Photodegradation Nuclear chemistry |
| Zdroj: | Catalysts Volume 10 Issue 9 Catalysts, Vol 10, Iss 1097, p 1097 (2020) |
| ISSN: | 2073-4344 |
| DOI: | 10.3390/catal10091097 |
| Popis: | Ag and AgI-modified ZnO composites (Ag/ZnO and AgI/ZnO) were synthesized in facile ways. The photocatalysts were used for the photodegradation of metronidazole (MNZ) under the irradiation of simulated sunlight. The results of experiments showed that both Ag/ZnO and AgI/ZnO had a specific molar ratio to reach the best performance. Ag/ZnO performed better in the photodegradation of MNZ than AgI/ZnO under the same conditions. The reaction rate constant of AgI/ZnO was less affected by the variation of initial concentration of MNZ or pH values. The main reactive oxygen species of the photocatalytic process are OH, O2&minus and h+, but the free radicals which play the most critical part differ in Ag/ZnO and AgI/ZnO. Several intermediates were revealed by LC&ndash MS/MS analysis. The stability of the photocatalysts was evaluated by a series of repeated MNZ photodegradation experiments. The results showed that AgI/ZnO had better stability than Ag/ZnO. |
| Databáze: | OpenAIRE |
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