Three-phase nanocomposites of two nanoclays and TiO2: Synthesis, characterization and photacatalytic activities

Dimitrios Papoulis, Sridhar Komarneni, Dionisios Panagiotaras, Elias Stathatos, Konstantinos C. Christoforidis, Marcos Fernández-García, Huihui Li, Yin Shu, Tsugio Sato, Hiroaki Katsuki

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Abstract

For the first time two different nanoclay minerals were combined with nanophase anatase for the synthesis of three-phase nanocomposites with improved photocatalytic properties. The novel halloysite (H)+palygorskite (Pal)-TiO2 nanocomposites were prepared using palygorskite and halloysite from Greece. Three nanocomposites were synthesized using [Hal+Pal] to TiO2 mass ratios of [10+20]:70, [15+15]:70 and [20+10]:70, respectively by depositing anatase form of TiO2 on the clay surfaces using titanium isopropoxide as a precursor under hydrothermal treatment at 180°C. Phase composition, particle morphology and physical properties of these three-phase nanocomposites were characterized by XRD, ATR-FTIR, SEM, TEM, DR-UV-Vis, N2-adsorption/desorption isotherms. The photocatalytic activities of three-phase clay-titania nanocomposites in decomposing NOx gas and toluene vapor were determined. The three-phase clay-titania nanocomposites showed significantly higher photocatalytic activity in decomposing inorganic and organic pollutants compared to that of either palygorskite- or halloysite-TiO2 nanocomposites under both UV- and visible-light irradiation. These studies led to a new class of clay-based nanocomposite materials with advanced photocatalytic properties.

Original languageEnglish (US)
Pages (from-to)526-533
Number of pages8
JournalApplied Catalysis B: Environmental
Volume147
DOIs
StatePublished - Apr 5 2014

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Environmental Science(all)
  • Process Chemistry and Technology

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    Papoulis, D., Komarneni, S., Panagiotaras, D., Stathatos, E., Christoforidis, K. C., Fernández-García, M., Li, H., Shu, Y., Sato, T., & Katsuki, H. (2014). Three-phase nanocomposites of two nanoclays and TiO2: Synthesis, characterization and photacatalytic activities. Applied Catalysis B: Environmental, 147, 526-533. https://doi.org/10.1016/j.apcatb.2013.09.025