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Ag plasmonic nanoparticles and oxygen vacancies co-modified TiO2 nanoflowers for enhanced solar-driven photocatalytic water purification

IF 2.6 4区材料科学 Q3 CHEMISTRY, MULTIDISCIPLINARY

Journal of Nanoparticle Research Pub Date : 2025-08-26 DOI:10.1007/s11051-025-06418-8

Xiqiang Mao, Jun Li, Lei Wu, Sujing Zou, Xue Lu, Shaoyi Li, Jian Yang, Ximei Fan

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引用次数: 0

Abstract

The water pollution caused by industrial wastewater is becoming increasingly serious, and efficient and sustainable remediation strategies need to be developed. This study improved the photocatalytic performance of TiO₂ through defect engineering and precious metal modification. Oxygen vacancies were introduced into TiO₂ nanoflowers through NaBH₄ reduction, leading to a decrease in the band gap of TiO₂ from 3.02 to 2.88 eV, thereby broadening its light absorption range. Additionally, the introduced oxygen vacancy defect states suppressed the recombination of electrons and holes. Subsequently, Ag nanoparticles were photo-deposited on the surface, synthesizing Ag/TiO_2-x nanoflowers. The localized surface plasmon resonance (LSPR) effect of the Ag nanoparticles significantly enhanced the material’s visible-light absorption performance. Overall, due to the synergistic effect of oxygen vacancies and Ag nanoparticles, the photocatalytic degradation performance of Ag/TiO_2-x nanoflowers in degrading RhB under simulated sunlight has been significantly enhanced compared to that of pure TiO₂ nanoflowers. The degradation rate of Rhodamine B (RhB) by optimized 1%-Ag/TiO_2-x under simulated sunlight reached 84.7%, with a rate constant (k = 0.0287 min⁻¹) 4.1 times higher than that of pristine TiO₂. The possible mechanism for this enhancement in the photocatalytic activity of the Ag/TiO_2-x is explained.

查看原文本刊更多论文

银等离子体纳米粒子和氧空位共修饰TiO2纳米花用于增强太阳能驱动光催化水净化

工业废水对水体的污染日益严重，需要制定高效、可持续的治理策略。本研究通过缺陷工程和贵金属修饰提高了TiO2的光催化性能。通过NaBH4还原在TiO2纳米花中引入氧空位，使TiO2的带隙从3.02 eV减小到2.88 eV，从而拓宽了其光吸收范围。此外，氧空位缺陷态的引入抑制了电子和空穴的复合。随后，Ag纳米粒子被光沉积在表面，合成了Ag/TiO2-x纳米花。银纳米粒子的局部表面等离子体共振（LSPR）效应显著提高了材料的可见光吸收性能。综上所述，由于氧空位和Ag纳米粒子的协同作用，Ag/TiO2-x纳米花在模拟阳光下降解RhB的光催化降解性能比纯TiO2纳米花明显增强。优化后的1%-Ag/TiO2-x在模拟阳光下对罗丹明B （Rhodamine B, RhB）的降解率达到84.7%，速率常数（k = 0.0287 min−1）是原始TiO2的4.1倍。本文还解释了Ag/TiO2-x光催化活性增强的可能机制。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Nanoparticle Research

Journal of Nanoparticle Research 工程技术-材料科学：综合

CiteScore

4.40

自引率

4.00%

发文量

198

审稿时长

3.9 months

期刊介绍： The objective of the Journal of Nanoparticle Research is to disseminate knowledge of the physical, chemical and biological phenomena and processes in structures that have at least one lengthscale ranging from molecular to approximately 100 nm (or submicron in some situations), and exhibit improved and novel properties that are a direct result of their small size. Nanoparticle research is a key component of nanoscience, nanoengineering and nanotechnology. The focus of the Journal is on the specific concepts, properties, phenomena, and processes related to particles, tubes, layers, macromolecules, clusters and other finite structures of the nanoscale size range. Synthesis, assembly, transport, reactivity, and stability of such structures are considered. Development of in-situ and ex-situ instrumentation for characterization of nanoparticles and their interfaces should be based on new principles for probing properties and phenomena not well understood at the nanometer scale. Modeling and simulation may include atom-based quantum mechanics; molecular dynamics; single-particle, multi-body and continuum based models; fractals; other methods suitable for modeling particle synthesis, assembling and interaction processes. Realization and application of systems, structures and devices with novel functions obtained via precursor nanoparticles is emphasized. Approaches may include gas-, liquid-, solid-, and vacuum-based processes, size reduction, chemical- and bio-self assembly. Contributions include utilization of nanoparticle systems for enhancing a phenomenon or process and particle assembling into hierarchical structures, as well as formulation and the administration of drugs. Synergistic approaches originating from different disciplines and technologies, and interaction between the research providers and users in this field, are encouraged.

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