Geopolymers
Inorganic polymeric new materials
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Lucas Bomfim Bolzon
Lucas Bomfim Bolzon
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, 70904-970, Brasilia, D.C., Brazil
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Alexandre G. S. Prado
Alexandre G. S. Prado
QuiCSI Team, Institute of Chemistry, University of Brasilia, C.P. 4478, 70904-970, Brasilia, D.C., Brazil
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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).
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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;82:219–224. .
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4. Tanabe, K. Catalytic application of niobium compounds. Catal Today. 2003;78:65–77. .
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5. Filipek, E, Piz, M. The reactivity of SbVO5 with T-Nb2O5 in solid state in air. J Therm Anal Calorim. 2010;101:447–453. .
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7. Datka, J, Turek, AM, Jehng, JM, Wachs, IE. Acidic properties of supported niobium oxide catalysts-an infrared spectroscopy investigation. J Catal. 1992;135:186–199. .
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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;237:115–119. .
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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;186:202–206. .
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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;15:8553–8557. .
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11. Kosmulski, M. Oxide electrolyte interface electric double layer in mixed solvent systems. Colloids Surf A. 1995;95:81–100. .
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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;67:967–983. .
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13. Kallay, N, Madic, T, Kucej, K, Preocanin, T. Enthalpy of interfacial reactions at TiO2 aqueous interface. Colloids Surf A. 2003;230:3–11. .
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14. Wisniewska, M. Studies of temperature influence on adsorption behaviour of nonionic polymers at the zirconia-solution interface. J Therm Anal Calorim. 2010;101:743–751. .
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15. Wisniewska, M. Temperature effect on adsorption properties of silica-polyacrylic acid interface. J Therm Anal Calorim. 2010;101:753–760. .
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16. Costa, LL, Prado, AGS. TiO2 nanotubes as recyclable catalyst for efficient photocatalytic degradation of indigo carmine dye. J Photochem Photobiol A. 2009;201:45–49. .
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17. Prado, AGS, Costa, LL. Photocatalytic decolouration of malachite green dye by application of TiO2 nanotubes. J Hazard Mater. 2009;169:297–301. .
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| 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 |
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| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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