Air Pollution Department, Environmental Research Division, National Research Centre, 33 EL Bohouth St., Dokki, Giza, 12622, Egypt.
Chemistry of Natural and Microbial Products Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, 33 EL Bohouth St., Dokki, Giza, 12622, Egypt.
Environ Sci Pollut Res Int. 2020 Jul;27(19):24507-24517. doi: 10.1007/s11356-020-08779-0. Epub 2020 Apr 19.
Photocatalytic oxidation (PCO) has been described as an advanced technology to remove toxic volatile organic compounds (VOCs) and airborne microorganisms from indoor air environments. This technique is economic, stable, safe, and capable to remove a wide variety of organic contaminants under UV irradiation. This study presents a case study on the effect of a fabricated filter in the removal of toluene at 26 mg/L and disinfection of ambient air under a given operating condition. The principal goals of this study were to synthesize Ag nanoparticles/TiO filter for the first time via the deposition of Ag nanoparticles on a commercial immobilized TiO tissue sheet by impregnation technique and to investigate the performance of this prepared Ag/TiO tissue based filter system for toluene removal as well as to remove airborne microorganisms from indoor air. The results illustrated that under the experimental conditions, Ag/TiO-based filter was able to disinfect well the microorganisms. The performance of Ag/TiO filter shows two different stages; the first one is a slight adsorption phase in dark with approximately 15% of toluene removal within 60 min. The second stage is a photooxidation phase under UV irradiation in which the toluene removal efficiency was significantly enhanced with extension of the operational time and reached 97% during this stage. Additionally, the Ag/TiO filter has a higher disinfection capacity of airborne microorganisms that completely removed to reach 100% after 300 min of application. This filter could be practically introduced as an effective system in industrial, hospital, and home applications for air purification. Graphical abstract.
光催化氧化（PCO）被描述为一种从室内空气环境中去除有毒挥发性有机化合物（VOC）和空气传播微生物的先进技术。该技术经济、稳定、安全，能够在紫外线照射下去除各种有机污染物。本研究介绍了在给定操作条件下，用制造的过滤器去除 26mg/L 的甲苯和对环境空气进行消毒的案例研究。本研究的主要目的是首次通过浸渍技术将 Ag 纳米粒子沉积在商用固定化 TiO 组织片上来合成 Ag 纳米粒子/TiO 过滤器，并研究该制备的 Ag/TiO 组织基过滤器系统对甲苯去除以及从室内空气中去除空气传播微生物的性能。结果表明，在实验条件下，Ag/TiO 基过滤器能够很好地消毒微生物。Ag/TiO 过滤器的性能呈现出两个不同的阶段；第一阶段是在黑暗中轻微的吸附阶段，在 60 分钟内大约去除了 15%的甲苯。第二阶段是在紫外线照射下的光氧化阶段，随着操作时间的延长，甲苯的去除效率显著提高，在这个阶段达到了 97%。此外，Ag/TiO 过滤器对空气传播微生物具有更高的消毒能力，经过 300 分钟的应用后完全去除，达到 100%。该过滤器可实际引入工业、医院和家庭应用中的有效空气净化系统。
