| Autor: |
Gannavarapu, Krishna Prasad, Thakkar, Megha, Veerapaga, Sidhartha, Wei, Liping, Dandamudi, Rajesh Babu, Mitra, Somenath |
| Zdroj: |
Nanotechnology Reviews; June 2018, Vol. 7 Issue: 3 p247-255, 9p |
| Abstrakt: |
We report the study of nanoporous silica-iron oxide composite generated from diatom frustules as a highly active catalyst for the photodegradation of the dye Rhodamine-6G. The unique architecture and high surface area of diatoms were utilized to immobilize iron oxide on their surface to form the composite. Photodegradation was carried out under 365-nm radiation and was observed using the absorption spectrum of the dye. The reaction was found to follow pseudo-first-order kinetics. The results were compared with commercially available granular iron oxide. The rate constant K (min−1) for photodegradation by the diatom composite was found to be as high as 0.0584 min−1for diatom-FeOxcomposites, which is 52% higher than 0.0273 min−1for granular FeOxat a dye concentration of 0.02 mm. The unique structural morphology and the synthetic strategy have led to the composites showing superior activity in the degradation of the dye Rhodamine-6G. |
| Databáze: |
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