Photodegradation of Rhodamine B in Aqueous Solution Using TiO<sub>2</sub> Polymorphs: EPR Spectroscopy Investigation - Université de Lille Accéder directement au contenu
Article Dans Une Revue Water, Air, and Soil Pollution Année : 2024

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


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 Abstract
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Dates et versions

hal-04516576 , version 1 (22-03-2024)



Hania Ahouari, Zainab Samraoui, Ahcène Soualah, Karima Ben Tayeb Meziane. Photodegradation of Rhodamine B in Aqueous Solution Using TiO2 Polymorphs: EPR Spectroscopy Investigation. Water, Air, and Soil Pollution, 2024, Water Air Soil Pollut., 235, ⟨10.1007/s11270-023-06822-7⟩. ⟨hal-04516576⟩
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