CONVERSION OF NOX GASES TO NITRATE IONS BY OXIDATION WITH PERSULFATE SPECIES FOR AIR PURIFICATION

Abstract

The absorption and oxidation of NOx gases by potassium persulfate has been implemented to remove the NOx gases from the air by forced ventilation through wet silica gel beads soaked with K2S2O8 /K2CO3 and (NH4)2S2O8 /K2CO3 .The influence conditions: air flow, duration, cartridge packing, concentration of solution on the efficiency of NOx capturing was studied. The ability to absorb NOx gases and convert into nitrate ions was confirmed, however low efficiency ≅0.1% indicates that improvements of the method are required. The increase of duration decreases the efficiency, and increase of the packing increases the efficiency of absorption, however the exact magnitudes appear inconsistent.