Wang Fengguang, Zhou Feng, Zhan Su, He Qiuchen, Song Yupeng, Zhang Chenglin, Lai Jianfu
Key Laboratory of Ship-Machinery Maintenance and Manufacture for Ministry of Transport, Dalian Maritime University, Dalian, 116026, PR China.
Key Laboratory of Ship-Machinery Maintenance and Manufacture for Ministry of Transport, Dalian Maritime University, Dalian, 116026, PR China.
Environ Res. 2021 Jul;198:111256. doi: 10.1016/j.envres.2021.111256. Epub 2021 May 8.
The use of photocatalytic technology to kill bacteria on marine vessel surface coatings has been paid more attention by research scholars. In this paper, petal-like microspheres with Ag nanoparticles were prepared by a simple one-step process combining the hydrothermal method and photodeposition. The 0.7% Ag/BiOCO composite photocatalyst exhibited the highest photocatalytic efficiency for bacterial removal under visible light irradiation and had the highest photogenerated carrier separation efficiency, and the sterilization rate was doubled compared with that of pure BiOCO, reaching 95%. Using X-ray photoelectron spectroscopy, scanning electron microscopy and transmission electron microscopy, the existence of Ag nanoparticles was confirmed, and their size was approximately 10 nm. The surface plasmon resonance (SPR) effect of Ag nanoparticles was investigated by ultraviolet-visible diffuse reflectance spectroscopy (DRS). It was shown that the surface plasmon resonance effect of Ag improved the spectral utilization of the Ag/BiOCO composite photocatalyst and enhanced the stability of the catalyst. This caused the Ag/BiOCO composite photocatalyst to have superior photocatalytic activity to pure BiOCO. The results of electrochemical impedance characterization and transient photocurrent response show that 0.7% Ag/BiOCO has a high efficiency of photogenerated carrier separation. By the free radical capture test, hydroxyl radicals were the primary active substance, and Ag improved the photocatalytic sterilization activity.
光催化技术用于杀灭船舶表面涂层上的细菌已受到研究学者的更多关注。本文通过水热法和光沉积相结合的简单一步法制备了负载银纳米颗粒的花瓣状微球。0.7%Ag/BiOCO复合光催化剂在可见光照射下对细菌去除表现出最高的光催化效率，具有最高的光生载流子分离效率，杀菌率比纯BiOCO提高了一倍，达到95%。利用X射线光电子能谱、扫描电子显微镜和透射电子显微镜，证实了银纳米颗粒的存在，其尺寸约为10nm。通过紫外-可见漫反射光谱（DRS）研究了银纳米颗粒的表面等离子体共振（SPR）效应。结果表明，银的表面等离子体共振效应提高了Ag/BiOCO复合光催化剂的光谱利用率，增强了催化剂的稳定性，使得Ag/BiOCO复合光催化剂具有优于纯BiOCO的光催化活性。电化学阻抗表征和瞬态光电流响应结果表明，0.7%Ag/BiOCO具有高效的光生载流子分离效率。通过自由基捕获试验表明，羟基自由基是主要的活性物质，银提高了光催化杀菌活性。
