Minireview and Perspective of One-Dimensional Manganese Oxide Nanostructures for the Removal of Air Pollutants

With the continuous expansion of the industrial production scale and the rapid development of urbanization, ecological damage and environmental pollution caused by air pollutants have become a non-negligible problem in human society. Catalytic technology is one of the most promising and environmentally friendly measures in the past few decades to deal with airborne pollutants. The exploitation and research of efficient and low-cost catalysts is the determining element for the development of the catalytic oxidation process. One-dimensional (1D) manganese oxide shows high activity, selectivity, and stability, which gives credit to the excellent redox ability and surface acidy of MnOx. Additionally, the defect sites, acid–base characteristics, and valence state of the element are all modulated by the 1D morphologies of these catalysts. As a result, they have been widely employed to reduce air pollution. In this paper, the fabrication process of manganese oxide nanowires, nanorods, and nanosheets is reviewed in detail. Second, we briefly summarize the application of 1D manganese oxide nanostructures for the removal of nitrogen oxides, volatile organic compounds, carbon monoxide, ozone, and other pollutants. Finally, several approaches were proposed for the future research directions of one-dimensional manganese oxide nanostructures, hoping to narrow the gap between the novel manganese oxide-based catalysts and the actual demands and to realize commercialized application in the nearest future.