Pt/PtOx Nanoparticle-Decorated BiVO4 Pinelike Structure for Enhanced Sulfamethoxazole Mineralization under Visible Light Irradiation
Source abstract
Abstract
Effective charge separation is an important factor for enhancing the activity of BiVO 4 photocatalysts. In this study, we present selective and random deposition of Pt/PtO x nanoparticles on the surface of BiVO 4 pinelike architectures (Pt/PtO x /BiVO 4 ) to improve charge separation. The effectiveness of the charge separation achieved through noble metal decoration depends on the specific loading location on the surface of the BiVO 4 crystal. The photocatalytic activity of the Pt/PtO x /BiVO 4 samples was investigated through the photodegradation of sulfamethoxazole (SMX) under visible light irradiation. Pt/PtO x decorated on the BiVO 4 {040} facet catalyst (Pt/PtO x /BiVO 4 -PD) resulted in higher approximately 1.5 times higher SMX photodegradation compared to that of Pt/PtO x randomly decorated Pt/PtO x on BiVO 4 (Pt/PtO x /BiVO 4 -R) and approximately 23 times higher than that of bare BiVO 4 . In addition, Pt/PtO x /BiVO 4 -PD achieved 83% total organic carbon (TOC) removal, whereas Pt/PtO x /BiVO 4 -R and BiVO 4 achieved TOC removal rates of 68 and 8%, respectively. The three-dimensional excitation-emission matrix fluorescence spectra further confirmed the high degree of mineralization achieved by the Pt/PtO x /BiVO 4 -PD. The establishment of a Schottky barrier at the interface between the Pt/PtO x and BiVO 4 {040} facets provides an efficient route for transferring and accumulating photoinduced electrons from the conduction band of BiVO 4 to the Pt/PtO x nanoparticles. The holes (h + ) and superoxide ( • O 2 – ) radicals were identified as the primary active species during the SMX elimination reaction over the Pt/PtO x /BiVO 4 -PD photocatalyst. A liquid chromatography–mass spectroscopy system was employed to analyze the intermediate products of SMX present in the solution following the reaction. This investigation can provide offer insights into the development of heterojunction photocatalysts for antibiotic photodegradation in aqueous media through the synthesis of a heterojunction photocatalyst.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Gas Sensing Nanomaterials and Sensors
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Environmental Engineering, College of Environmental and Marine, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Republic of Korea
Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam
Faculty of Environmental and Food Engineering, Nguyen Tat Thanh University, Ho Chi Minh City 700000, Vietnam
Funding
Pukyong National University
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