Abstract

The combination of semiconductor and metal nanocomponents represents an effective way for design of photocatalysts with high efficiency. It is expected that this strategy can be applied to design photo-regulated nanozymes. To prove this concept, BiOBr/PtRu hybrid nanostructures have been fabricated by depositing PtRu nanoparticles on BiOBr nanosheets through a templating co-reduction method. The formation of BiOBr/PtRu hybrid nanostructures was confirmed by TEM, XRD and XPS. BiOBr/PtRu hybrid nanostructures exhibited excellent enzyme-like activities (peroxidase, oxidase, ferroxidase) as well as the ability to scavenge DPPH free radicals. When exposed to light irradiation (λ > 420 nm), it was found that BiOBr/PtRu hybrid nanostructures not only exhibit improved photocatalytic degradation, but also exhibit enhanced peroxidase- and oxidase-like activity. Due to the photocatalytic effect and the higher charge separation and utilization efficiency caused by heterojunctions, a light-enhanced enzyme-like activity mechanism was proposed. These results will be of value to design high efficiency nanozymes using light for biological and environmental applications.

摘要

半导体和金属纳米组分的结合代表了一种高效设计光催化剂的有效途径。预计该策略可用于设计光调节纳米酶。为了证明这一概念，通过模板共还原方法将 PtRu 纳米颗粒沉积在 BiOBr 纳米片上，制备了 BiOBr/PtRu 混合纳米结构。BiOBr/PtRu 杂化纳米结构的形成通过 TEM、XRD 和 XPS 证实。BiOBr/PtRu 杂化纳米结构表现出优异的类酶活性（过氧化物酶、氧化酶、亚铁氧化物酶）以及清除 DPPH 自由基的能力。当暴露于光照射 ( λ > 420 nm)，发现 BiOBr/PtRu 杂化纳米结构不仅表现出改善的光催化降解，而且表现出增强的过氧化物酶和氧化酶样活性。由于异质结的光催化作用和更高的电荷分离和利用效率，提出了一种光增强的类酶活性机制。这些结果对于利用光设计用于生物和环境应用的高效纳米酶具有价值。