Synthesis of zinc sulfide nanoparticles stabilized by sodium dodecylsulfate micelles and evaluation of photocatalytic activity

摘要

Zinc sulfide nanoparticles have beensynthesized using sodium dodecylsulfate micelles as a stabilizing agent. The as-prepared nanoparticles are characterized by ultraviolet-visiblespectroscopy, energy dispersive X-ray spectroscopy, X-ray diffraction andtransmission electron microscopy. The photocatalytic activity of the ZnSnanoparticles has been evaluated by monitoring the degradation of methyl orangewith a UV-visible spectrophotometer. The effect of ZnS concentration on thephotocatalytic degradation of the dye has been investigated. Under optimumexperimental conditions, 98% of the dye is degraded in the presence of thephotocatalyst during 10 min of irradiation with ultraviolet light. The turnoverfrequency for methyl orange degradation per mg of ZnS is calculated to be 6×1013molecules s-1. The effect of SDS concentration on thephotocatalytic degradation of the dye has also been investigated. The resultssuggest that SDS micelles do not catalyze the degradation of the dye. Themechanism of the photocatalytic degradation of methyl orange has beendiscussed.