Pd nanoparticles decorated BiVO4 pine architectures for photocatalytic degradation of sulfamethoxazole

• Published in: Chemosphere (Oxford) Vol. 321; p. 138118
• Main Authors: Le-Duy, Nhat, Hoang, Lan-Anh T., Nguyen, Trinh Duy, Lee, Taeyoon
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.04.2023
• Subjects: Antibiotic elimination; BiVO4 pine architectures; Heterojunction; Pd nanoparticle; Visible-light irradiation; Antibiotic elimination; Visible-light irradiation; BiVO4 pine architectures; Pd nanoparticle; Heterojunction
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2023.138118

Sulfamethoxazole (SMX) has been extensively detected in wastewater treatment plant effluents and surface water. Because of its potential risks to ecology and health, treatment for eliminating SMX is urgently required. In this study, we report the application of Pd nanoparticles decorated on BiVO4 pine architecture for the photocatalytic degradation of SMX. The results showed that the barer BiVO4 and Pd–BiVO4 eliminated SMX under visible-light irradiation. After 210 min of irradiation, 98.8% of SMX was substantially eliminated by Pd–BiVO4, whereas bare BiVO4 can degraded approximately 36.3% of SMX. Pd–BiVO4 also exhibited a high mineralization rate (84% of total organic carbon (TOC) removal) compared to bare BiVO4 (51% of TOC removal). Through three-dimensional excitation-emission matrix fluorescence spectra, SMX with high fluorescence intensity can be degraded to non-fluorescence intermediate products, further confirming the high mineralization of SMX over Pd–BiVO4 catalyst. Well-dispersed Pd nanoparticles on the {040} facet of BiVO4 pine architecture can support the recombination of photogenerated charge carriers because of the formation of the Schottky junction at the Pd–BiVO4 interface. Besides, the active species trapping tests indicated that •O2− and h+ radicals dominate SMX photodegradation over Pd–BiVO4. The main degradation intermediates of SMX in the reaction solution was also identified through ultra-performance liquid chromatography-quadrupole time-of-flight mass spectrometry analysis. This investigation can provide insight into designing metallic/semiconductor junctions for antibiotic elimination in water media. [Display omitted] •Pd–BiVO4 heterojunction photocatalyst is prepared via photoreduction method.•Pd nanoparticles is well-dispersed on the {040} facet of BiVO4 pine architecture.•Pd–BiVO4 exhibits a better SMX removal and mineralization rate compared to BiVO4.•The formation of the Schottky junction at the Pd–BiVO4 interface is confirmed.