Qian Yuhang, Ma Dongge, Zhong Junbo
Department of Chemistry, College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing, China.
College of Chemical Engineering, Sichuan University of Science and Engineering, Zigong, China.
Front Chem. 2021 Nov 15;9:749839. doi: 10.3389/fchem.2021.749839. eCollection 2021.
With their outstanding diversities in both structures and performances, newly emerging metal-organic frameworks (MOFs) materials are considered to be the most promising artificial catalysts to meet multiple challenges in the fields of energy and environment. Especially in absorption and conversion of solar energy, a variety of MOFs can be readily designed to cover and harvest the sun irradiation of ultraviolet (UV), visible and near-infrared region through tuning both organic linkers and metal nodes to create optimal photocatalytic efficiency. Nowadays, a variety of MOFs were successfully synthesized as powerful photocatalysts for important redox reactions such as water-splitting, CO reduction and aqueous environmental pollutants detoxification. MOFs applications in indoor-air VOCs pollutants cleaning, however, are less concerned partially because of limited diffusion of both gaseous pollutant molecules and photo-induced active species in very porous MOFs structures. In this mini-review, we focus on the major breakthroughs of MOFs as photocatalysts for the effective removal of indoor-air VOCs such as aldehydes, aromatics and short-chain alcohols. According to their nature of photoactive centers, herein MOFs photocatalysts are divided into two categories to comment, that is, MOFs with variable valence metal nodes as direct photoactive centers and MOFs with non-variable valence metal nodes but after combining other photoactive variable valence metal centers as excellent concentrated and concerted electron-transfer materials. The mechanisms and current challenges of the photocatalytic degradation of indoor-air VOC pollutants by these MOFs will be discussed as deeply as possible.
新兴的金属有机框架（MOFs）材料在结构和性能上具有突出的多样性，被认为是应对能源和环境领域多重挑战最具潜力的人工催化剂。特别是在太阳能吸收与转换方面，通过调整有机连接体和金属节点以创造最佳光催化效率，可轻松设计出多种MOFs来覆盖和捕获紫外（UV）、可见光及近红外区域的太阳辐射。如今，已成功合成多种MOFs作为强大的光催化剂用于水分解、CO还原及水环境污染物解毒等重要氧化还原反应。然而，MOFs在室内空气中挥发性有机化合物（VOCs）污染物净化方面的应用较少受到关注，部分原因是气态污染物分子和光致活性物种在极多孔的MOFs结构中的扩散受限。在这篇综述中，我们重点关注MOFs作为光催化剂有效去除室内空气中醛类、芳烃和短链醇类等VOCs的主要突破。根据其光活性中心的性质，本文将MOFs光催化剂分为两类进行评述，即具有可变价金属节点作为直接光活性中心的MOFs和具有不变价金属节点但在结合其他光活性可变价金属中心后作为优异的集中和协同电子转移材料的MOFs。将尽可能深入地讨论这些MOFs光催化降解室内空气中VOC污染物的机理及当前面临的挑战。
