School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Faculty of Science, National University of Singapore, Singapore 117543, Singapore.
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China.
J Colloid Interface Sci. 2022 Oct 15;624:713-724. doi: 10.1016/j.jcis.2022.06.007. Epub 2022 Jun 6.
The application of TiO-based photocatalysts in air pollution control has attracted much attention thanks to their advantageous green and sustainable performance. However, how to improve the degradation efficiency under visible light is still challenging. Herein, we report a ternary three-dimensional "PIZZA"-like BiMoO-TiO/diatomite (BTD) composite with high-efficient mineralization and recycling performance towards gaseous formaldehyde (HCHO) under visible light. The high-efficient adsorption-photocatalysis collaborative system with intimate interface combination is successfully established among BiMoO (BMO), TiO and diatomite. The HCHO mineralization rate constant of BTD-1:2 composite is up to around 4.03 times and 2.18 times higher than those of bare BMO and binary BiMoO-TiO composite, respectively. It is indicated that the introduction of diatomite increases active sites and plays the vital role in the improvement of photocatalysis. In addition, the photogenerated holes (h) and hydroxyl radical (OH) are proved to be the main active species for HCHO mineralization. Furthermore, there is a competitive adsorption relationship between water (HO) molecules and HCHO molecules, and both HO molecules and oxygen (O) molecules participated in the reaction of HCHO mineralization based on in-situ DRIFTs spectra analysis. Our work would give a new perspective on gaseous HCHO purification.
基于 TiO2 的光催化剂在空气污染控制中的应用因其具有有利的绿色和可持续性能而引起了广泛关注。然而，如何提高可见光下的降解效率仍然具有挑战性。在此，我们报道了一种具有高效矿化和可回收性能的三元三维“PIZZA”状 BiMoO-TiO/硅藻土（BTD）复合材料，可在可见光下高效去除气态甲醛（HCHO）。在 BiMoO（BMO）、TiO 和硅藻土之间成功建立了高效吸附-光催化协同体系，具有紧密的界面结合。BTD-1:2 复合材料的 HCHO 矿化速率常数分别比纯 BMO 和二元 BiMoO-TiO 复合材料高约 4.03 倍和 2.18 倍。结果表明，硅藻土的引入增加了活性位点，对光催化性能的提高起到了重要作用。此外，实验证明光生空穴（h）和羟基自由基（OH）是 HCHO 矿化的主要活性物质。此外，基于原位 DRIFTs 光谱分析，水分子（HO）和 HCHO 分子之间存在竞争吸附关系，HO 分子和氧气（O）分子都参与了 HCHO 矿化反应。我们的工作为气态 HCHO 的净化提供了新的视角。
