Photocatalytic Oxidation of Urea on Surface-Modified Bi 2 WO 6 with trans -4-Stilbenecarboxaldehyde

MADRIZ, LOREAN; PARRA, MARIANO; GARCÍA EINSCHLAG, FERNANDO S.; NÚÑEZ, OSWALDO; CABRERIZO, FRANCO M.; VARGAS, RONALD

JOURNAL OF PHYSICAL CHEMISTRY C

AMER CHEMICAL SOC

Año: 2021 vol. 125 p. 12682 - 12689

1932-7447

Modification of the Bi2WO6 surface with trans-4-stilbenecarboxaldehyde (4SCA) by the equilibrium adsorptionmethod and its application in photoredox reactions under solarirradiation were studied. The modification of the surface of Bi2WO6 atacidic pH implied an acetal-type interaction with the aldehyde, andthen the separation of the solid at neutral pH guaranteed theirreversible covalent functionalization. Langmuir isotherm measurementsand infrared spectroscopy support the surface modification.Studies based on stationary and time-resolved photoluminescencespectroscopy showed the effect on the dynamics (lifetime) of chargecarrier deactivation due to surface modification. A higher rate offormation of the hydroxyl radical using Bi2WO6−4SCA as compared