Low frequency ultrasound (42 kHz) assisted degradation of Acid Blue 113 in the presence of visible light driven rare earth nanoclusters loaded TiO 2 nanophotocatalysts

Panneerselvam Sathishkumar, Ramalinga Viswanathan Mangalaraja, Oscar Rozas, Héctor D. Mansilla, M. A. Gracia-Pinilla, Sambandam Anandan

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

An attempt has been made to render the visible light driven photocatalytic activity to the TiO2 nanocatalysts by loading 1 wt% of rare earth (RE) nanoclusters (Gd3+, Nd3+ and Y3+) using a low frequency (42 kHz) producing commercial sonicator. The STEM-HAADF analysis confirms that the RE nanoclusters were residing at the surface of the TiO 2. Transmission electron microscopic (TEM) and X-ray diffraction (XRD) analyses confirm that the loading of RE nanoclusters cannot make any significant changes in the crystal structure of TiO2. However, the optical properties of the resulted nanocatalysts were significantly modified and the nanocatalysts were employed to study the sonocatalytic, photocatalytic and sonophotocatalytic decolorization as well as mineralization of Acid Blue 113 (AB113). Among the experimented nanocatalysts maximum degradation of AB113 was achieved in the presence Y3+-TiO2 nanocatalysts. The decolorization of AB113 in the presence and absence of Y3+ loaded TiO2 ensues the following order sonolysis < photocatalysis < sonocatalysis < sonophotocatalysis. The sonophotocatalytic decolorization of AB113 shows 1.4-fold (synergy index) enhanced rate when compared with the two corresponding individual advanced oxidation processes. The sonophotocatalytic mineralization shows that 65% of total organic carbon (TOC) can be removed from AB113 after the 5 h of continuous irradiation however the mineralization cannot be able to show the synergetic effect.

Original languageEnglish
Pages (from-to)1675-1681
Number of pages7
JournalUltrasonics Sonochemistry
Volume21
Issue number5
DOIs
StatePublished - Sep 2014
Externally publishedYes

Keywords

  • Acid Blue 113
  • Mineralization and combined AOPs
  • Sonophotocatalysis

Fingerprint

Dive into the research topics of 'Low frequency ultrasound (42 kHz) assisted degradation of Acid Blue 113 in the presence of visible light driven rare earth nanoclusters loaded TiO 2 nanophotocatalysts'. Together they form a unique fingerprint.

Cite this