Development of thermally stable fiber-based air filter materials

The hot flue gas from the industry is one of the main factors that cause air pollution. Therefore, the purification of hot flue gas is important for the environment and humankind. The fiber-based air filters have attracted much attention in the field of air purification due to its larger specific surface area and higher porosity. However, most fiber materials cannot withstand such high temperatures. In view of this, this paper reviewed the development of thermally stable fiber-based air filters in recent years. The main topics were focused on the raw materials (organic fibers, inorganic fibers) which can be used in the preparation of thermally stable air filters, preparation technologies (needle punching, spun lace, melt-blown, electrospinning, centrifugal spinning, air jet spinning, etc.) and multifunctional modification (denitration, desulfuration, and VOCs removal, etc.) of thermally stable fiber-based air filters. The shortcomings of thermally stable fiber-based air filters were discussed from the preparation to application. The development of thermally stable fibers, preparation technologies and multi-functionalization would be the key points for thermally stable fiber-based air filters. It was expected that thermally stable fiber-based air filters would gain more applications in the future. © 2023 Chemical Industry Press. All rights reserved.