Abstract
H2O2 is the cornerstone of the modern chemical industry and has a wide range of applications. Graphite felt coated with carbon oxide black can be used as an efficient cathode material to produce H2O2. The electrode can be used to remove Hg0 in the gas phase. Through the characterization of the catalyst, it was observed that oxidized carbon black has more functional groups and defects than carbon black. The increase of −C = O can promote oxygen reduction reaction, and then produce H2O2 through electrochemical two-electron oxygen reduction, and finally show better Hg0 removal performance. The oxidative removal of Hg0 was 81.5 % after 60 min at current density = 9.2 mA/cm2, electrolyte concentration = 0.06 mol/L and pH = 4.6. which is 33.5 % higher than that of original graphite felt, and it still has good stability and repeatability after 7 repetitions. At the same time, DFT calculation revealed that the incorporation of CB into C = O promoted the conversion of O2 to H2O2. Finally, this study opens up a new way for efficient, rapid, green, clean, and sustainable removal of Hg0 from the gas phase.
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