In the present study, the HS photolysis using the self-made high-frequency discharge electrodeless lamp (light distribution was 90% at 254 nm and 10% at 185 nm) was studied and simulated by MATLAB software. Firstly, the effects of the initial HS concentration, irradiation time, oxygen content and relative humidity on HS photolysis efficiency were experimentally investigated. The results indicated that the photolysis efficiency decreased from 100% to 90.13% with the increase in the initial concentration from 3 to 30 mg/m, and the main product was HSO. With the relative humidity increased from 0% to 99%, HS photolysis efficiency was obviously improved under different atmospheres (O> air > Ar), indicating the significant effect of relative humidity and oxygen concentration. The simulation results were consistent with the experimental results, indicating the feasibility of the simulation model. Moreover, based on the photoreactions, model simulation and equilibrium analysis of sulphur species, the photodegradation pathway of HS was further inferred. HS was oxidized to HSO by O and other strong oxidizing radicals excited by 185 nm UV light.
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