Morphology of ZnS Particles Produced from Various Zinc Salts by Homogeneous Precipitation
Abstract
The primary purpose of the present study was to investigate the role of supporting anions on the kinetics of precipitation and on the morphology of the particles formed. To do this, zinc sulfide was precipitated by thermal decomposition of thioacetamide (TAA) in acidic aqueous solutions where sulfate, acetate, chloride and nitrate ions were employed as supporting anions. Colloidal sols of ZnS were prepared by thermal decomposition of thioacetamide in acidic zinc solutions. Precipitation was carried out in the presence of nitrate, acetate, chloride and sulfate ions. Particle morphology was influenced by the chemical nature of the anions present in the solution as well as the rate of sulfide ion generation. Spherical, monodisperse particles having a specific type of particle size distribution, i.e., monosized, bimodal or continuous distribution, with mean sizes in the range of 0.15 micrometers to 3 micrometers, were formed depending on the anion type and sulfide ion generation rate. Individual particles always consisted of clusters of sphalerite crystallites except when sulfide ions were generated at low rates and sulfate ions were present. In such cases a mixture of alpha and beta ZnS were formed. Keywords: Colloides.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 14, 1988
- Accession Number
- ADA202748
Entities
People
- Ahmet Celikkaya
- Mufit Akinc
Organizations
- Iowa State University