LAUSR

Abstract Integrated pollutant removal technology has gradually become a research focus due to its simple layout and low operating cost. The research and development of this technology does not only benefit the operation of coal-fired power plants but also provide an idea for the removal of pollutants from numerous industrial boilers. In this paper, the recent development of mainstream advanced oxidation-integrated gas removal technology, which includes non-thermal plasma, chlorine-based, sulfur-based, ozone oxidation absorption, and Fenton-based methods, was comprehensively reviewed. The advantages and disadvantages of these methods were illustrated, and the superiority of the application prospects of Fenton-based methods was clarified. Then, two studies focusing on multi-air-pollutant removal mechanism during Fenton-based processes were discussed in detail, including the catalytic reaction mechanism of NO and the catalytic mechanism of different metal-element doping catalysts. The mechanisms of different doping metal elements were classified into four aspects: (1) redox pairing formed by transition metals; (2) induction of photocatalytic reaction to generate conduction band electrons; (3) formation of electrochemical corrosion units; and (4) optimization of the physical and chemical characteristics of the catalyst to promote H2O2 adsorption and dissociation. The industrialization prospects were systematically analyzed, and the operation cost only accounted for 20% of the traditional wet flue gas desulfurization and selective catalytic reduction removal system. Meanwhile, two feasibility Fenton-based industrial design ideas were proposed. The challenges and suggestions on oxidants, catalysts, and economic operation for future application were analyzed, thus providing inspirations for multi-air-pollutant removal.