Preparation Of ZnS Nanoparticles And Its Application To Treatment Of Fortincture Waste Water

ZnS semiconductor nanoparticles have special properties in some fields such as photoelectricity, magnetism, catalyse and energetics and so on, which is closely related to their different structures and morphologies. So it is very necessary for the industrialization to prepare ZnS semiconductor nanoparticles with controllable particle size, shape and crystallinity and their assemble products.First, according to the theoretical analysis and experimental study, the mechanism for structure and morphology control of ZnS nanoparticles prepared by homogeneous precipitation was revealed, and then the growth unit model and growth mechanism model were established. In the solution, colloidal core and anion coordination tetrahedron were co-existing. When the supersaturation was higher, the growth of particleswas mainly subject to colloidal core and poor crystallinity products were obtained. On the contrary, anion coordination tetrahedron played a more important role and powders with rule shape and better crystallinity were obtained. These growth units were absorbed and join the crystal lattice on the growth interface through collision and aggregation.The powders with better crystallinity and double cone or tetrahedron shape were obtained after amorphous ZnS was treated by solventthermal method. This technology had such advantages asmoving water and impurities, protecting CdS from oxidation and easy recycling organic reagent and so on.The experimental results of photocatalytic decomposition fortincture solution shew ZnS nanoparticls with lower than 10nm size and their assembling products had excellent photocatalytic decomposition rate for tincture solution.