Cheng Rong, Xia Jincheng, Wen Junying, Xu Pingping, Zheng Xiang
School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China.
School of Architectural Equipment Engineering, Zhejiang College of Construction, Hangzhou 311231, China.
Nanomaterials (Basel). 2022 Apr 13;12(8):1335. doi: 10.3390/nano12081335.
Volatile organic compounds (VOCs) in indoor air are considered a major threat to human health and environmental safety. The development of applicable technologies for the removal of VOCs is urgently needed. Nowadays, photocatalytic oxidation (PCO) based on metal-containing photocatalysts has been regarded as a promising method. However, unmodified photocatalysts are generally limited in applications because of the narrow light response range and high recombination rate of photo-generated carriers. As a result, nano metal-containing photocatalysts doped with elements or other materials have attracted much attention from researchers and has developed over the past few decades. In addition, different doping types cause different levels of catalyst performance, and the mechanism for performance improving is also different. However, there are few reviews focusing on this aspect, which is really important for catalyst design and application. This work aims to give a comprehensive overview of nano metal-containing photocatalysts with different doping types for the removal of VOCs in an indoor environment. First, the undoped photocatalysts and the basic mechanism of PCO is introduced. Then, the application of metal doping, non-metal doping, co-doping, and other material doping in synthetic metal-containing photocatalysts are discussed and compared, respectively, and the synthesis methods, removal efficiency, and mechanisms are further investigated. Finally, a development trend for using nano metal-containing photocatalysts for the removal of VOCs in the future is proposed. This work provides a meaningful reference for selecting effective strategies to develop novel photocatalysts for the removal of VOCs in the future.
室内空气中的挥发性有机化合物（VOCs）被认为是对人类健康和环境安全的重大威胁。迫切需要开发适用的VOCs去除技术。如今，基于含金属光催化剂的光催化氧化（PCO）被视为一种有前景的方法。然而，未经改性的光催化剂由于光响应范围窄和光生载流子复合率高，在应用中通常受到限制。因此，掺杂元素或其他材料的纳米含金属光催化剂在过去几十年中引起了研究人员的广泛关注并得到了发展。此外，不同的掺杂类型导致催化剂性能水平不同，性能提升的机制也不同。然而，很少有综述关注这一方面，而这对于催化剂的设计和应用非常重要。这项工作旨在全面概述不同掺杂类型的纳米含金属光催化剂在室内环境中去除VOCs的情况。首先，介绍了未掺杂的光催化剂和PCO的基本机制。然后，分别讨论和比较了金属掺杂、非金属掺杂、共掺杂以及其他材料掺杂在合成含金属光催化剂中的应用，并进一步研究了合成方法、去除效率和机制。最后，提出了未来使用纳米含金属光催化剂去除VOCs的发展趋势。这项工作为未来选择有效的策略来开发用于去除VOCs的新型光催化剂提供了有意义的参考。
