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- Title
Novel diatom-FeO<italic><sub>x</sub></italic> composite as highly active catalyst in photodegradation of Rhodamine-6G.
- Authors
Gannavarapu, Krishna Prasad; Thakkar, Megha; Veerapaga, Sidhartha; Wei, Liping; Dandamudi, Rajesh Babu; Mitra, Somenath
- Abstract
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−1 for diatom-FeO<italic>x</italic> composites, which is 52% higher than 0.0273 min−1 for granular FeO<italic>x</italic> at 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.
- Subjects
DIATOM frustules; SILICA; CATALYSTS; PHOTODEGRADATION; RHODAMINES
- Publication
Nanotechnology Reviews, 2018, Vol 7, Issue 3, p247
- ISSN
2191-9089
- Publication type
Article
- DOI
10.1515/ntrev-2017-0218