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Morphology, structure, and photoactivity of two types of graphene oxide–TiO2 composites

  • Anca Peter EMAIL logo , Leonard Mihaly-Cozmuta , Anca Mihaly-Cozmuta , Camelia Nicula , Agnieszka Jastrzębska , Patrycja Kurtycz and Andrzej Olszyna
Published/Copyright: March 19, 2015
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Chemical Papers
From the journal Chemical Papers Volume 69 Issue 6

Abstract

Two types of graphene oxide-TiO2 composites were prepared: one by including graphene oxide flakes in the TiO2 sol, followed by thermal treatment (GI composite) at 300°C, and the second by including graphene oxide flakes in the calcined (at 500°C) TiO2 xerogel (GII composite). The composites were characterized by SEM, TEM-EDS, TEM-SADP, STEM-HAADF, HRTEM coupled with FT, XRD, and XPS. Photocatalysis results were fitted to different kinetic models (pseudo-first and pseudo-second kinetics, intraparticle Weber-Morris diffusion, film diffusion, and external mass transfer). The results showed that by introducing graphene oxide flakes in the TiO2 sol, followed by thermal treatment at 300°C (GI composite), an efficient graphene oxide-TiO2 catalyst with high specific surface area, heterogeneity, and many graphitized areas can be obtained. Complete crystallization of the composite is not the key issue for the best photoactivity achievement. The rate limiting step in the photocatalytic process is the photooxidation of SA molecules on the TiO2 surface.

Keywords: graphene oxide-TiO2; photocatalytic activity; kinetic model; morpho-structural characterization

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Received: 2014-9-11
Revised: 2014-12-2
Accepted: 2014-12-3
Published Online: 2015-3-19
Published in Print: 2015-6-1

© 2015 Institute of Chemistry, Slovak Academy of Sciences

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https://doi.org/10.1515/chempap-2015-0088
Keywords for this article
graphene oxide-TiO2; photocatalytic activity; kinetic model; morpho-structural characterization

Articles in the same Issue

  1. Laser microsampling and multivariate methods in provenance studies of obsidian artefacts
  2. Ultra-trace arsenic and mercury speciation and determination in blood samples by ionic liquid-based dispersive liquid–liquid microextraction combined with flow injection-hydride generation/cold vapor atomic absorption spectroscopy
  3. Determination of formaldehyde by flow injection analysis with spectrophotometric detection exploiting brilliant green–sulphite reaction
  4. Passive sampling application to control air quality in interior of new vehicles
  5. Low-temperature enzymatic hydrolysis resolution in mini-emulsion media
  6. Performance and characterisation of CeO2–TiO2–WO3 catalysts for selective catalytic reduction of NO with NH3
  7. Catalytic wet peroxide oxidation of m-cresol over Fe/γ-Al2O3 and Fe–Ce/γ-Al2O3
  8. Morphology, structure, and photoactivity of two types of graphene oxide–TiO2 composites
  9. A novel efficient magnetic core–zeolitic shell nanocatalyst system: preparation, characterization and activity
  10. Characterisation and coagulation performance of polysilicate–ferric–zinc
  11. Antioxidant activity of rosemary extracts in solution and embedded in polymeric systems
  12. Comparison of selected aroma compounds in cultivars of sea buckthorn (Hippophae rhamnoides L.)
  13. Thio-click approach to the synthesis of stable glycomimetics
  14. Synthesis of ether-linked [60]fullerene glycoconjugates by nucleophilic cyclopropanation
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