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Superior photocatalytic properties of carbonized PANI/TiO2 nanocomposites

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2017
Authors
Radoicic, Marija
Ciric-Marjanovic, Gordana
Spasojevic, Vuk
Ahrenkiel, Scott Phillip
Mitrić, Miodrag
Novaković, Tatjana
Šaponjić, Zoran
Article (Published version)
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Abstract
A simple bottom-up method for the preparation of novel and very efficient photocatalytic nanocomposite system based on carbonized form of polyaniline (PANI) and colloidal TiO2 nanocrystals has been developed. The carbonized PANI/TiO2 nanocomposites were synthesized in a two-step procedure. Firstly, non-carbonized PANI/TiO2 nanocomposites were synthesized by the chemical oxidative polymerization of aniline (ANI) with ammonium peroxydisulfate, in the presence of colloidal TiO2 nanoparticles (TiO2 NPs) (d 4.5 nm). Initial [TiO2 NANI] mole ratios were 20, 50, and 80. In the second step, following the polymerization process, the carbonization of PANI/TiO2 nanocomposites was performed by thermal treatment in an inert atmosphere at 650 degrees C. The morphological and structural properties of the carbonized nanocomposites were studied using transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and Raman spectroscopy. The accomplishment of c...omplete carbonization of PANI in PANI/TiO2 nanocomposites was confirmed by Raman spectroscopy. The appearance of anatase and rutile crystal forms in TiO2 NPs upon carbonization, with mass ratio depending on the initial molar ratio of ANI and TiO2 NPs was revealed by XRD measurements, TEM, SEM and Raman spectroscopy. The photocatalytic activities of carbonized PANI/TiO2 nanocomposites were evaluated following the photocatalytic degradation processes of Rhodamine B and Methylene blue. Carbonized PANI/TiO2 nanocomposites showed higher photocatalytic efficacy compared to bare TiO2 NPs and non-carbonized PANI/TiO2 nanocomposites. The porosity and surface structure of carbonized PANI/TiO2 nanocomposites, as well as crystalline structure of TiO2, affect photocatalytic activity of nanocomposites.

Keywords:
Photocatalysis / TiO2 / Carbonized polyaniline
Source:
Applied Catalysis B-Environmental, 2017, 213, 155-166
Publisher:
  • Elsevier Science Bv, Amsterdam
Projects:
  • Size-, shape- and structure- dependent properties of nanoparticles and nanocomposites (RS-172056)
  • Electroconducting and redox-active polymers and oligomers: synthesis, structure, properties and applications (RS-172043)
  • Materials of Reduced Dimensions for Efficient Light Harvesting and Energy conversion (RS-45020)
Note:
  • The peer-reviewed version: http://cer.ihtm.bg.ac.rs/handle/123456789/3018

DOI: 10.1016/j.apcatb.2017.05.023

ISSN: 0926-3373

WoS: 000402633300016

Scopus: 2-s2.0-85018897251
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URI
http://cer.ihtm.bg.ac.rs/handle/123456789/2238
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  • Radovi istraživača / Researchers' publications
Institution
IHTM

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