Authors:
Lucas Bomfim BolzonQuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, 70904-970, Brasilia, D.C., Brazil

Search for other papers by Lucas Bomfim Bolzon in
Current site
Google Scholar
PubMed
Close
and
Alexandre G. S. PradoQuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, 70904-970, Brasilia, D.C., Brazil

Search for other papers by Alexandre G. S. Prado in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

The protonation and deprotonation of the Nb2O5 surface has been followed in order to understand the reactions of surface of this catalyst. The simultaneous potentiometric and conductometric titrations had been carried by using 50 mL of water suspension of Nb2O5 40 g L−1. The oxide was entirely deprotonated when adding 0.4 mL NaOH 1 mol L−1, and later titrated with 0.1 mol L−1. The titration had supplied K1 and K2 and the obtained values were 3.24 × 10−3 and 4.17 × 10−8, respectively. The zero point charge was pHpcz = 4.94. The thermodynamic studies were carried out by using 50 mL of a 40 g/L Nb2O5 aqueous suspension with the pH adjusted to pHPZC value. The suspension was titrated with 0.5 mol/L of HNO3 or NaOH for protonation or deprotonation studies, respectively, in an isoperibol calorimeter CSC ISC-4300. Thus, the obtained thermodynamic values of the protonation and deprotonation of Nb2O5 were ΔdpG = −37.60 kJ/mol, ΔdpH = −23.72 kJ/mol and ΔdpS = 47 J/(mol K).

  • 1. Prado, AGS, Bolzon, LB, Pedroso, CP, Moura, AO, Costa, LL. Nb2O5 as efficient and recyclable photocatalyst for indigo carmine degradation. Appl Catal B. 2008;82:219224. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 2. Nowak, I, Ziolek, M. Niobium compounds: preparation, characterization, and application in heterogeneous catalysis. Chem Rev. 1999;99:36033624. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 3. Tanabe, K, Okazaki, S. Various reactions catalyzed by niobium compounds and materials. Appl Catal A. 1995;133:191218. .

  • 4. Tanabe, K. Catalytic application of niobium compounds. Catal Today. 2003;78:6577. .

  • 5. Filipek, E, Piz, M. The reactivity of SbVO5 with T-Nb2O5 in solid state in air. J Therm Anal Calorim. 2010;101:447453. .

  • 6. Iizuka, T, Ogasawara, K, Tanabe, K. Acidic and catalytic properties of niobium penaoxide. Bull Chem Soc Jpn. 1983;56:29272931. .

  • 7. Datka, J, Turek, AM, Jehng, JM, Wachs, IE. Acidic properties of supported niobium oxide catalysts-an infrared spectroscopy investigation. J Catal. 1992;135:186199. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 8. Prado, AGS, Faria, EA, SouzaDe, JR, Torres, JD. Ammonium complex of niobium as a precursor for the hydrothermal preparation of cellulose acetate/Nb2O5 photocatalyst. J Mol Catal A. 2005;237:115119. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 9. Torres, JD, Faria, EA, SouzaDe, JR, Prado, AGS. Preparation of photoactive chitosan-niobium (V) oxide composites for dye degradation. J Photochem Photobiol A. 2006;186:202206. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 10. Rudzinski, W, Charmas, R, Piasecki, W. Searching for thermodynamic relations in ion adsorption at oxide/electrolyte interfaces studied by using the 2-pK protonation model. Langmuir. 1999;15:85538557. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 11. Kosmulski, M. Oxide electrolyte interface electric double layer in mixed solvent systems. Colloids Surf A. 1995;95:81100. .

  • 12. Gaboriaud, F, Ehrhardt, J. Effects of different crystal faces on the surface charge of colloidal goethite (alpha-FeOOH) particles: an experimental and modeling study. Geochim Cosmochim Acta. 2003;67:967983. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 13. Kallay, N, Madic, T, Kucej, K, Preocanin, T. Enthalpy of interfacial reactions at TiO2 aqueous interface. Colloids Surf A. 2003;230:311. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 14. Wisniewska, M. Studies of temperature influence on adsorption behaviour of nonionic polymers at the zirconia-solution interface. J Therm Anal Calorim. 2010;101:743751. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 15. Wisniewska, M. Temperature effect on adsorption properties of silica-polyacrylic acid interface. J Therm Anal Calorim. 2010;101:753760. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 16. Costa, LL, Prado, AGS. TiO2 nanotubes as recyclable catalyst for efficient photocatalytic degradation of indigo carmine dye. J Photochem Photobiol A. 2009;201:4549. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • 17. Prado, AGS, Costa, LL. Photocatalytic decolouration of malachite green dye by application of TiO2 nanotubes. J Hazard Mater. 2009;169:297301. .

    • Crossref
    • Search Google Scholar
    • Export Citation
  • Collapse
  • Expand

To see the editorial board, please visit the website of Springer Nature.

Manuscript Submission: HERE

For subscription options, please visit the website of Springer Nature.

Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
1
Issues
per Year
24
Founder Akadémiai Kiadó
Founder's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

Monthly Content Usage

Abstract Views Full Text Views PDF Downloads
Aug 2022 0 0 0
Sep 2022 1 0 0
Oct 2022 1 0 0
Nov 2022 0 0 0
Dec 2022 2 0 0
Jan 2023 1 0 0
Feb 2023 0 0 0