SnS/MWNTs/sponge electrode combined with plasma dielectric barrier discharge catalytic system: CO reduction and pollutant degradation.

SnS nanosheets combined with multi-walled carbon nanotubes (MWNTs) were made into sponge electrodes which were used for CO reduction reaction (CORR) in dielectric barrier discharges (DBD) system. The amounts of formate and formaldehyde produced by CO reduction with SnS/MWNTs/sponge electrode were 299.52 and 31.62 μmol h, which were higher than that of MWNTs/sponge electrodes. The addition of pollutants had different degrees of inhibitory effect on CO reduction, among which addition of bisphenol A (BPA) had the smallest effect that the degradation rate of BPA was 94.37% and the C1 products remained 204.43 μmol after 60 min discharge. The mechanism of CORR was studied by quencher experiment, and the main contribution order of the active substance in DBD system for CORR is: H>e>·OH>·O. It was found that the degradation process of pollutants consumed H and e in solution, thereby inhibiting CORR. Generally, the SnS/MWNTs/sponge electrode provided a reference for the design of catalysts for CO reduction and pollutant degradation in plasma gas-liquid system.