Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Water Année : 2023

Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach

Mohammed-Amine Edaala
Lekbira El Mersly
  • Fonction : Auteur
Abdelaziz Aloui Tahiri
  • Fonction : Auteur
Lahssen El Blidi
Maher M Alrashed
  • Fonction : Auteur
Salah Rafqah

Résumé

The aim of this study is to propose a successful method for the treatment of water contaminated by pharmaceutical pollutants through homogeneous photocatalysis in the presence of decatungstate ions (W 10 O 32 4-). Sulfamethazine (SMZ), a sulfonamide antibiotic, was used as a model molecule. The results showed that SMZ could be effectively degraded with this process under simulated solar irradiation. SMZ degradation kinetics were studied with different dioxygen and SMZ concentrations, pH values, and photocatalyst masses. Optimal conditions were determined to be pH 7, [Na 4 W 10 O 32 ] = 0.33 g/L, and [SMZ] = 13.9 mg/L under the aerated condition, resulting in 85% SMZ degradation in 240 min, using a 36W-UVA/UVB light source. Hydroxyl radicals were identified as the major contributors to SMZ elimination. Four photoproducts identified with high-performance liquid chromatography coupled with mass spectrometry were formed by the cleavage of the sulfonamide bond and the hydroxylation of both the aromatic ring and pyrimidine moiety. SMZ was completely mineralized after 90 h of irradiation in the presence of decatungstate anions. These results provided a mechanism for the photocatalytic degradation of SMZ in an aqueous solution. To sustain this mechanism, theoretical studies were carried out using density functional theory calculations. This involved Fukui functional analyses, including ring hydroxylation, C-S bond cleavage, and molecular rearrangement processes.

Domaines

Chimie
Fichier principal
Vignette du fichier
water-15-04058.pdf (4.31 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Licence : CC BY - Paternité

Dates et versions

hal-04426398 , version 1 (30-01-2024)

Licence

Paternité

Identifiants

Citer

Mohammed-Amine Edaala, Lekbira El Mersly, Abdelaziz Aloui Tahiri, Pascal Wong-Wah-Chung, Lahssen El Blidi, et al.. Photocatalytic Degradation of the Antibiotic Sulfamethazine Using Decatungstate Anions in an Aqueous Solution: Mechanistic Approach. Water, 2023, 15, pp.4058. ⟨10.3390/w15234058⟩. ⟨hal-04426398⟩
6 Consultations
6 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More