Synergistic degradation of NO and C7H8 for inhibition of O-3 generation
Li, Kanglu 1Wang, Hong 1Chen, Lvcun 1Li, Jieyuan 1Dong, Fan1
扫码查看
点击上方二维码区域，可以放大扫码查看
作者信息
1. Univ Elect Sci & Technol
折叠
Abstract
NOx and VOCs are primary air pollutants and their photochemical reactions would generate secondary pollutants like O-3 with NO2 intermediate as the direct precursor. Here we apply a highly efficient In(OH)(3) photocatalyst to degrade mixed NO and C7H8 for inhibition of photochemical O-3 generation. The dual pollutants show synergistic interaction from the adsorption process to photocatalytic reaction. C7H8 and NO exhibit non-competitive adsorption and coupling reaction effects on In(OH)(3) surface. The coupling intermediate C7H7NOH would be oxidized to nitrotoluene and further decomposed into CO2 and nitrates. Meanwhile, the protons and electrons released during the oxidation of C7H8 can reduce NO to NH4+. Gibbs free energy calculation reveals that the coupling and reduction reactions are more favorable than the oxidation of NO to NO2. The new conversion path of NO on In(OH)(3) when C7H8 coexists could enable an increase of NO conversion efficiency to 100.0% and a decrease of NO2 selectivity to only 3.7%, thus highly inhibiting the formation of O-3.
Key words
Air purification/VOCs/NOx/O-3 generation/Synergistic control/IN-SITU DRIFTS/PHOTOCATALYTIC OXIDATION/CARBON NITRIDE/TOLUENE/OZONE/TEMPERATURE/ADSORPTION/AIR
NSTL
Elsevier