In Situ Calorimetric Measurements of the Enthalpy of Oxidation of Methyl Orange in an Aqueous Solution over Titanium Dioxide Photocatalyst

Autor:	R. R. Mansurov, S. D. Chernyuk, Alexander P. Safronov
Rok vydání:	2021
Předmět:	inorganic chemicals Isothermal microcalorimetry chemistry.chemical_compound Aqueous solution chemistry Reagent Enthalpy Titanium dioxide Photocatalysis Methyl orange Physical and Theoretical Chemistry Redox Nuclear chemistry
Zdroj:	Russian Journal of Physical Chemistry A. 95:2148-2153
ISSN:	1531-863X 0036-0244
Popis:	Isothermal microcalorimetry is used to study the oxidation of methyl orange (MO) dye in an aqueous solution under the action of a redox system (Fenton’s reagent, Fe2+/H2O2), and in an aqueous suspension of P25 titanium dioxide nanoparticles that display photocatalytic activity upon UV irradiation. A calorimetric cell of original design is used that allows the stirring of TiO2 suspensions containing methyl orange dye with simultaneous UV irradiation. It is shown that the oxidation of MO is in both cases accompanied by a considerable release of heat. The enthalpy of oxidation of the dye is calculated with allowance for the degree of MO conversion: −(10.6 ± 0.06) × 106 J/mol for the oxidation of MO with Fenton’s reagent and −(8.3 ± 0.18) × 106 J/mol for the photocatalytic oxidation of MO when using titanium dioxide particles.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4ce5b8ffa127afec63d254a6a082753b https://doi.org/10.1134/s0036024421100186 Zobrazit plný text záznamu Full text from SpringerLink