ENHANCED PLASMONIC ACTIVITY IN AG-MODIFIED MnO2/SiO2 SPHERES FOR RAPID MITIGATION OF ANTIBIOTIC RESISTANCE

Kasimayan Uma, Yu-Hung Chen, Yu-Ching Chen, Xiu-Jia Guan, Zong-Liang Tseng, Lung-Chien Chen and Shun-Hsyung Chang
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Kasimayan Uma: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan
Yu-Hung Chen: ��Department of Microelectronics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan
Yu-Ching Chen: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan
Xiu-Jia Guan: ��Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, Taiwan
Zong-Liang Tseng: ��Organic Electronics Research Center, Ming Chi University of Technology, New Taipei City, Taiwan
Lung-Chien Chen: Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei, Taiwan
Shun-Hsyung Chang: ��Department of Microelectronics Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, Taiwan

Surface Review and Letters (SRL), 2025, vol. 32, issue 07, 1-8

Abstract: Ternary SiO2/MnO2–Ag composites were synthesized and evaluated as photocatalysts for the degradation of antibiotic Tetracycline (TC) in aqueous solution. Morphological and optical analyses demonstrated that MnO2 nanoparticles were efficiently tailored on the adsorbed sites of SiO2 spheres, while plasmonic metallic silver nanoparticles (Ag NPs) were coated on the surface of the SiO2/MnO2 composite. The SiO2/MnO2–Ag ternary composition, as obtained, exhibited remarkable photocatalytic activity in the degradation of TC (91.3%) antibiotic, surpassing the performance of individual SiO2, MnO2, and SiO2/MnO2 catalysts. This higher photocatalytic efficiency is primarily attributed to two key factors: enhanced photo-absorption capabilities facilitated by the presence of Ag nanoparticles, and the substantial mitigation of photoinduced electron and hole recombination through efficient charge transfer at the Schottky junction. SiO2 plays a pivotal role by acting as a template that accelerates the separation of electron–hole pairs, while Ag metal serves as an electron sink, thereby bolstering interfacial charge transfer.

Keywords: Photocatalysis; SiO2 sphere; MnO2; plasmonic silver; antibiotics (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1142/S0218625X25400025

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