Preparation,Characterization And Property Studies Of Micro/Nano ZnS Materials

Micro/nano zinc sulfide semiconductor has been paid extensive attention due to its good optical and photocatalytic properties. While its properties are closely related to its morphology, size and structure and so on. In this article, the morphology, size and structure of products can be controlled by regulating different reaction conditions, which then tailor the properties of products further.Firstly, researches show that in the systems of no adding protactants and adding PVP as the protactant, spherical ZnS particles were all obtained by a hydrothermal method using zinc nitrate and thiourea as the reactants. Meanwhile, researches also show that the crystal type of obtained ZnS materials is all wurtzite. In addition, the size of the products can be controlled to about 1.0 ?m by adjusting reaction temperature, reaction time and so on.Then, core-shell ZnS structures were successfully synthesized by a one-pot hydrothermal route. Zinc nitrate and thiourea were used as the reactants. Simultaneously, sodium dodecyl sulfate was used as the protactant. Results show that both the core and shell consist of the same chemical composition. Moreover, the formation and closure degree of the shell can be easily tailored by adjusting reaction time. Under optimal conditions, core-shell ZnS particles with the diameter of about 3.0 ?m can be obtained. Finally, the prepared samples were used as photocatalysts for degradation of methylene blue solution under UV light irradiation. It turns out that the photocatalytic activities of ZnS particles are closely related to their morphology. Furthermore, the degradation rate of the core-shell ZnS particles could reach 97.3%.