rGO doped S0.05N0.1/TiO2 accelerated visible light driven photocatalytic degradation of dimethyl sulfide and dimethyl disulfide.

In this study, modification of TiO 2 was carried out by doping of non-metal elements (S and N) and various contents of reduced graphene oxide (rGO) for photocatalytic degradation of dimethyl sulfide (DMS) and dimethyl disulfide (DMDS). Among the tested photocatalyst, 0.1wt%rGO/S 0.05 N 0.1 TiO 2 had the best photocatalytic degradation efficiencies for both DMS and DMDS. Reduction of band gap and increment in surface area might be related to the improvement in photocatalytic activity. Examination was followed by the study of various parameters influence, reaction kinetics, and proposed reaction mechanism using 0.1wt%rGO/S 0.05 N 0.1 TiO 2. Dry and 1% relative humidity in gases promoted photocatalytic activity yet higher water vapor contents led to adsorption competition and reduced DMS and DMDS conversion. Langmuir-Hinshelwood kinetics model 4 presented the best suited result for photocatalytic degradation of DMS and DMDS using 0.1wt%rGO/S 0.05 N 0.1 TiO 2. Furthermore, proposed reaction mechanism for each type of pollutant was assembled from byproducts analysis during the reaction. [Display omitted] • rGO elevated specific surface area and electron transfer capacity of photocatalyst. • Enhancement on photocatalytic activity occurred due to formation of chemical defects. • The best DMS and DMDS photocatalytic degradation was done by 0.1 wt%rGO/S 0.05 N 0.1 TiO 2. • SO 2 , CO 2 , HCHO, CH 3 OOH, CH 3 OH, CO, and MSA were detected as products of DMDS. • DMS degradation generated SO 2 , CO 2 , DMDS, DMSO, DMSO 2 , CO, and MSA. [ABSTRACT FROM AUTHOR]