Controlling NOx is not only the key to improving air quality but it is also an important issue for air pollution control. In view of the performance of the wet oxidation absorption method in NOx removal, it has attracted extensive attention and has been widely studied. This article reviews the research progress of NOx removal from flue gas. The wet oxidation absorption method is mainly divided into three categories: direct oxidation absorption technique, catalytic oxidation absorption technique, and high energy ion oxidation absorption technique, which are discussed and analyzed comprehensively and systematically in this article. The development of this method in the future is discussed as well. It is believed that it has multiple advantages, as it possesses simple technological processes, high denitration rate, and easy to realize resource recycling and nonsecondary pollution. The wet oxidation absorption method is one of the more promising methods in terms of reducing operational costs and increasing NO oxidation degree and NOx removal rate.
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