Title :

Photodegradation of Rhodamine B in Aqueous Solution Using TiO₂ Polymorphs: EPR Spectroscopy Investigation

Author(s) :

Ahouari, Hania [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 [LASIRE]
Samraoui, Zainab [Auteur]
Soualah, Ahcène [Auteur]
Ben Tayeb Meziane, Karima [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Journal title :

Water Air Soil Pollut.

Abbreviated title :

Water Air Soil Pollut.

Volume number :

235

Pages :

-

Publication date :

2024-01-20

ISSN :

0049-6979

English keyword(s) :

EPR spectroscopy
TiO2 semiconductors
UV illumination
Holes/electrons pairs
Rhodamine B photodegradation

HAL domain(s) :

Chimie/Chimie théorique et/ou physique

English abstract : [en]

In this study, we reported the photocatalytic removal of Rhodamine B dye from aqueous solution by TiO2 polymorph powders under UV light illumination. The work primarily highlights the physico-chemical properties of TiO2 ...
Show more >In this study, we reported the photocatalytic removal of Rhodamine B dye from aqueous solution by TiO2 polymorph powders under UV light illumination. The work primarily highlights the physico-chemical properties of TiO2 semiconductors. X-ray diffraction (XRD) patterns confirmed the presence of anatase, rutile, and a mixture anatase–rutile phases. The nitrogen gas sorption analysis gives BET surface area with highest value obtained with anatase polymorph (74 m²/g). According to the ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS) study, anatase, rutile, and mixture had band gap energies of 3.35, 2.99, and 3.20 eV, respectively. The photoluminescence and the spin trapping results showed a weaker recombination of photoinduced charge carriers and a highest amount of hydroxyl OH• and superoxide O2−• radicals with anatase polymorph. The effect of the catalyst nature and loading on the photocatalytic degradation of Rhodamine B were investigated. The results demonstrated that the maximum rate of Rhodamine B degradation was 99.4% with anatase, 74.7% for mixture, and 67.3% for rutile after 145 min of UV illumination, under the optimum condition (initial dye concentration = 20 µM, catalyst dose = 0.123 g/L). Electron paramagnetic resonance and trapping experiments of free radical confirmed that singlet oxygen ¹O2 and h⁺ are the main reactive species, while •OH and •O2⁻ had displayed a more moderate effect. Graphical AbstractShow less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Research team(s) :

Propriétés magnéto structurales des matériaux (PMSM)

Submission date :

2024-02-28T23:56:31Z
2024-03-22T10:22:52Z