Emission of SO2, NO
x
, mercury
(Hg), and arsenic (As) from flue gas has become a great public concern
due to their hazards for human health and ecosystems. Simultaneous
removal of multipollutants (two or more of SO2, NO
x
, Hg, and As) has good development prospects
due to its simple system and low cost. Although many multipollutant
simultaneous removal technologies have been developed, green oxidation
absorption is one of the most promising technologies because it can
not only make full use of the existing WFGD devices, but also its
treatment process is clean. This review analyzes the latest research
advances in the removal of SO2, NO
x
, Hg, and As from flue gas using green oxidation absorption
technologies. The performance, mechanism, and kinetics of SO2, NO
x
, Hg, and As removal are reviewed.
The merits and drawbacks of these green oxidation absorption technologies
and the potential research directions are commented on. This review
indicates that each technology has its own advantages and disadvantages
in terms of removal efficiency, cost, reliability, and product post-treatment.
Photochemical and electrochemical removal technologies have a high
free radical yield and pollutant removal efficiency, but they have
complex systems, high energy consumption, or unreliable systems. Metal
oxide-activated peroxide oxidation technology has a good prospect
due to its simple process, low device requirements, and recyclability
of catalysts. However, it also has shortcomings such as a low free
radical yield and easy deactivation of catalysts. Other technologies
also have some disadvantages, such as high cost, low free radical
yield, difficult separation of products, complex equipment, and/or
low reliability. Synergic use of multitechnologies may be a promising
strategy because it can make up for the shortcomings of each technology.