Novel diatom-FeOx composite as highly active catalyst in photodegradation of Rhodamine-6G

Krishna Prasad Gannavarapu, Megha Thakkar, Sidhartha Veerapaga, Liping Wei, Rajesh Babu Dandamudi, Somenath Mitra

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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-FeOx composites, which is 52% higher than 0.0273 min-1 for granular FeOx 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.

Original languageEnglish (US)
Pages (from-to)247-255
Number of pages9
JournalNanotechnology Reviews
Issue number3
StatePublished - Jun 27 2018

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Medicine (miscellaneous)
  • Materials Science (miscellaneous)
  • Energy Engineering and Power Technology
  • Engineering (miscellaneous)
  • Process Chemistry and Technology


  • Rh-6G
  • diatom silica
  • nanoporous silica
  • photodegradation
  • silica-FeO composites


Dive into the research topics of 'Novel diatom-FeOx composite as highly active catalyst in photodegradation of Rhodamine-6G'. Together they form a unique fingerprint.

Cite this