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Sulfated BiWO(SBiWO)was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO(BiWO).The characterization results verified that sulfate anion mainly anchored on the catalyst surface greatly extended the visiblelight-responsive range without destroying the crystal lattice.Moreover,the SBiWO-based photoactivities were evaluated with the removal of Malachite Green(MG)under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps(MPEDL-2)and under visible light(λ>420nm).The results demonstrated that the kinetic constant was increased 2.25 times,varying from 0.1478(BiWO)to 0.3328min-1(SBiWO-1).Similar results were also obtained for the visible light-driven reaction.Furthermore,radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1.This indicated that the sulfating process increased the generation of reactive oxygen species,which was further verified by molecular probe with salicylic acid.Thus,more blue-shifting at λ=618nm was observed over SBiWO.On the basis of the above results,the photocatalytic mechanism over the sulfated catalyst was also discussed.
Sulfated BiWO (SBiWO) was synthesized by an impregnation method to enhance the visible-light-driven photoactivities of BiWO (BiWO). The characterization results verified that the sulfate anion mainly anchored on the catalyst surface greatly extended the visible light-responsive range without destroying the crystal lattice.Moreover, the SBiWO-based photoactivities were evaluated with the removal of Malachite Green (MG) under UV-Vis irradiation emitted from two microwave-powered electrodeless discharge lamps (MPEDL-2) and under visible light (λ> 420 nm) results demonstrated that the kinetic constant was increased 2.25 times, varying from 0.1478 (BiWO) to 0.3328 min-1 (SBiWO-1) .Similar results were also obtained for the visible light-driven reaction .Furthermore, radical scavengers such as t-butanol restricted the visible-light induced degradation of MG over BiWO and SBiWO-1.This indicated that the sulfating process increased the generation of reactive oxygen species, which was further verified by molecular probe with salicylic acid. Thus, more blue-shifting at λ = 618 nm was observed over SBiWO. On the basis of the above results, the photocatalytic mechanism over the sulfated catalyst was also discussed.