Details

Autor(en) / Beteiligte

• Huy, Bui The
• Nguyen, X. Cuong
• Bui, Vu Khac Hoang
• Tri, Nguyen Ngoc
• Rabani, Iqra
• Tran, Nhu Hoa Thi
• Ly, Quang Viet
• Truong, Hai Bang

Titel

Photocatalytic degradation of antibiotic sulfamethizole by visible light activated perovskite LaZnO3

Ist Teil von

• Journal of environmental sciences (China), 2024-10, Vol.144, p.212-224

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Perovskite LaZnO3 photocatalyst was synthesized for SMZ removal under visible light.•Good light absorption and suitable energy levels eased the creation of radicals.•Degradation pathways were unraveled using RP-HPLC/Q-TOF-MS and DFT computation.•Toxicity of SMZ and its intermediates was evaluated using QSAR. In this work, the perovskite LaZnO3 was synthesized via sol-gel method and applied for photocatalytic treatment of sulfamethizole (SMZ) antibiotics under visible light activation. SMZ was almost completely degraded (99.2% ± 0.3%) within 4 hr by photocatalyst LaZnO3 at the optimal dosage of 1.1 g/L, with a mineralization proportion of 58.7% ± 0.4%. The efficient performance of LaZnO3 can be attributed to its wide-range light absorption and the appropriate energy band edge levels, which facilitate the formation of active agents such as ·O2−, h+, and ·OH. The integration of RP-HPLC/Q-TOF-MS and DFT-based computational techniques revealed three degradation pathways of SMZ, which were initiated by the deamination reaction at the aniline ring, the breakdown of the sulfonamide moieties, and a process known as Smile-type rearrangement and SO2 intrusion. Corresponding toxicity of SMZ and the intermediates were analyzed by quantitative structure activity relationship (QSAR), indicating the effectiveness of LaZnO3-based photocatalysis in preventing secondary pollution of the intermediates to the ecosystem during the degradation process. The visible-light-activated photocatalyst LaZnO3 exhibited efficient performance in the occurrence of inorganic anions and maintained high durability across multiple recycling tests, making it a promising candidate for practical antibiotic treatment. [Display omitted]