College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China.
Molecules. 2023 Jan 18;28(3):972. doi: 10.3390/molecules28030972.
Photocatalytic oxidation is considered one of the most effective ways to remove formaldehyde from indoor air. However, the use of powder photocatalysts is limited by their low adsorption capacity and strong aggregation tendency. Hence, there is a need for a composite material with good cycling stability and high degradation efficiency. In the present study, a unique wood-based composite is produced by arranging Cu-TiO nanoparticles on porous structured wood. The porous structure of wood can adsorb formaldehyde, and the abundant functional groups on the surface can act as a reaction platform for anchoring the Cu-TiO nanoparticles. Cu doping facilitates electron interaction between TiO and Cu, promotes the transfer of charge carriers, lowers the electron-hole recombination rate, and improves the photocatalytic degradation efficiency of formaldehyde. The photocatalytic efficiency of the wood-based composites was highest (85.59%) when the n(Cu)/n(Ti) ratio was 7%. After nine cycles, the wood composites still had a high degradation rate, indicating good recyclability. Overall, this wood composite is an eco-friendly and promising material for indoor air filtration.
光催化氧化被认为是去除室内空气中甲醛的最有效方法之一。然而，粉末光催化剂的使用受到其低吸附能力和强烈聚集倾向的限制。因此，需要一种具有良好循环稳定性和高降解效率的复合材料。本研究通过在多孔结构木材上排列 Cu-TiO 纳米粒子来制备独特的基于木材的复合材料。木材的多孔结构可以吸附甲醛，表面丰富的官能团可以作为固定 Cu-TiO 纳米粒子的反应平台。Cu 掺杂促进了 TiO 和 Cu 之间的电子相互作用，促进了载流子的转移，降低了电子-空穴复合率，提高了甲醛的光催化降解效率。当 n(Cu)/n(Ti) 比为 7%时，基于木材的复合材料的光催化效率最高（85.59%）。经过九次循环后，木材复合材料仍具有较高的降解率，表明其具有良好的可回收性。总的来说，这种木材复合材料是一种环保且有前途的室内空气过滤材料。
