Pham Thanh-Dong, Lee Byeong-Kyu
Department of Civil and Environmental Engineering, University of Ulsan, Daehakro 93, Namgu, Ulsan 680-749, Republic of Korea.
Chem Eng J. 2015 Sep 1;275:357-365. doi: 10.1016/j.cej.2015.04.055. Epub 2015 Apr 16.
We investigated a novel approach by synthesizing an integrated material, which could act as both adsorbent and photocatalytic material, for bioaerosol purification under visible light conditions. Ag was used as a dopant agent to enhance photocatalytic activity of TiO, leading to high photocatalytic activity of the doped TiO even under visible light. Under visible light, the doped TiO photocatalyst could produce oxy radicals, oxidative agents, that participate in oxidation reactions to decompose important organic components of bacteria, leading to death or removal of bacteria from an aerosol. Adsorption property was integrated into the enhanced TiO photocatalyst by using polyurethane (PU), a honeycomb structure material, as a substrate for coating process of the doped TiO. Three materials including pristine PU, TiO coating on PU (TiO/PU), and Ag-doped TiO coating on PU (Ag-TiO/PU) were used to remove in an aerosol under visible light. Under dark conditions, the removal capacities of in the aerosol by PU, TiO/PU, and Ag-TiO/PU were 1.2 × 10, 2.7 × 10, and 6.2 × 10 (CFU/cm), respectively. Under visible light irradiation, the removal capacities of in an aerosol by PU, TiO/PU, and Ag-TiO/PU were 1.2 × 10, 2.7 × 10, and 1.8 × 10 (CFU/cm), respectively. The improvement of the removal capacity by TiO/PU and Ag-TiO/PU, versus PU, is due to adsorption alone and the combination of adsorption plus photocatalytic activity, respectively.
我们研究了一种新方法，即合成一种集成材料，该材料可同时作为吸附剂和光催化材料，用于可见光条件下的生物气溶胶净化。银用作掺杂剂以增强二氧化钛的光催化活性，使得即使在可见光下掺杂的二氧化钛也具有高光催化活性。在可见光下，掺杂的二氧化钛光催化剂可产生氧自由基，即氧化剂，这些氧化剂参与氧化反应以分解细菌的重要有机成分，从而导致细菌死亡或从气溶胶中去除。通过使用聚氨酯（PU）（一种蜂窝结构材料）作为掺杂二氧化钛涂层过程的基材，将吸附性能集成到增强的二氧化钛光催化剂中。使用三种材料，包括原始PU、PU上的二氧化钛涂层（TiO/PU）和PU上的银掺杂二氧化钛涂层（Ag-TiO/PU），在可见光下去除气溶胶中的[具体物质未提及]。在黑暗条件下，PU、TiO/PU和Ag-TiO/PU对气溶胶中[具体物质未提及]的去除能力分别为1.2×10、2.7×10和6.2×10（CFU/cm）。在可见光照射下，PU、TiO/PU和Ag-TiO/PU对气溶胶中[具体物质未提及]的去除能力分别为1.2×10、2.7×10和1.8×10（CFU/cm）。TiO/PU和Ag-TiO/PU相对于PU去除能力的提高，分别是由于单独的吸附以及吸附加光催化活性的组合。
