Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin Province 130022, PR China.
Key Laboratory of Bionic Engineering (Ministry of Education), College of Biological and Agricultural Engineering, Jilin University, Changchun, Jilin Province 130022, PR China.
J Colloid Interface Sci. 2019 Feb 1;535:516-523. doi: 10.1016/j.jcis.2018.10.020. Epub 2018 Oct 10.
We present a facile two-step procedure for synthesizing spiky nanohybrids of titanium dioxide/gold (TiO/Au) nanoparticles. In this process, spiky TiO is obtained using a hydrothermal method, followed by the introduction of plasmonic Au nanoparticles (AuNPs) via a photoreduction approach in which titanium fluoride and chloroauric acid tetrahydrate are used as raw materials. The photodegradation property of the resulting sample was evaluated according to the removal of Rhodamine B (RhB) and ciprofloxacin (CIP) via excitation with visible light. Additionally, the antimicrobial property of the spiky TiO/Au nanoparticles was examined with respect to the suppression of the growth of Escherichia coli (E. coli). Compared with commercial TiO, the spiky TiO/Au nanoparticles exhibited a significantly enhanced photocatalytic efficiency in persistent organic pollutant degradation and bacteria inactivation under simulated environmental conditions. The photocatalysis mechanism primarily entails the combination of AuNPs with spiky TiO nanoparticles, which increases the optical path owing to the unique spiky structures of the latter. This results in an improved light-harvesting efficiency based on the localized surface plasmon resonance (LSPR) of AuNPs and the promotion of the charge-separation efficiency through electron-trap processes. These nanoparticles realize the objective of effectively addressing the inherent weaknesses of bare TiO and potentially facilitate new fitting approaches for applications in sewage treatment and marine antifouling paint.
我们提出了一种简便的两步法来合成二氧化钛/金（TiO/Au）纳米粒子的刺状纳米杂化材料。在这个过程中，通过水热法获得刺状的 TiO，然后通过光还原法引入等离子体金纳米粒子（AuNPs），其中使用氟化钛和四水合氯金酸作为原料。根据罗丹明 B（RhB）和环丙沙星（CIP）的去除情况，通过可见光激发来评估所得样品的光降解性能。此外，还研究了刺状 TiO/Au 纳米粒子的抗菌性能，以抑制大肠杆菌（E. coli）的生长。与商业 TiO 相比，在模拟环境条件下，刺状 TiO/Au 纳米粒子在持久性有机污染物降解和细菌失活方面表现出显著增强的光催化效率。光催化机制主要涉及 AuNPs 与刺状 TiO 纳米粒子的结合，由于后者的独特刺状结构，增加了光程。这导致基于 AuNPs 的局域表面等离子体共振（LSPR）的光捕获效率提高，并通过电子陷阱过程促进电荷分离效率。这些纳米粒子有效地解决了裸 TiO 的固有弱点，并为污水处理和海洋防污涂料等应用提供了新的适配方法。
