Photocatalytic activity of transition metal substituted AM-6 under UV and visible light irradiation

Mariam N. Ismail, Juliusz Warzywoda, Rumeysa Tekin, Albert Sacco

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The photocatalytic activity of isomorphously substituted transition metal (TM) ions into the vanadosilicate AM-6 framework, at TM/V ratios of 0.025-0.10, has been investigated. All 0.025TM-substituted AM-6 products showed enhanced photocatalytic activity under UV light irradiation which was attributed to the bandgap photoexcitation of these products. The photocatalytic activity decreased with increasing TM concentrations (TM > 0.025). Under visible light irradiation, only 0.025Cr-AM-6 showed enhanced photocatalytic activity (k = 4.6 × 10−3 min−1 ± 4.0 × 10−4 min−1). This was attributed to the electron excitation for the interfacial charge-transfer in the visible light region. 0.025Fe-AM-6 (k = 3.1 × 10−3 min−1 ± 4.0 × 10−4 min−1), 0.025Co-AM-6 (k = 3.4 × 10−3 min−1 ± 6.0 × 10−4 min−1), and unmodified AM-6 (k = 2.9 × 10−3 min−1 ± 7.0 × 10−4 min−1) were inactive towards the photodegradation of methylene blue under visible light irradiation (direct photolysis k = 2.8 × 10−3 min−1 ± 4.0 × 10−4 min−1). This was likely attributed to the ineffectiveness of the electron excitation for the interfacial charge-transfer, as suggested by the UV–vis spectroscopic analyses.

Original languageEnglish
Pages (from-to)206-214
Number of pages9
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume353
DOIs
StatePublished - Feb 15 2018

Keywords

  • AM-6
  • Bandgap energy
  • Methylene blue
  • Photocatalysis
  • Transition metals
  • Vanadosilicate

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