New reagents for artificial precipitation technologies: hybrid powders AgI-SiO2

Abstract

Hybrid powder materials (HPs) of the AgI-SiO2 (AgI-MCM41), where SiO2 is mesoporous mesophase silicon dioxide MСM41, were synthesized using the method of hydrothermal template cocondensation (HTS method). The HPs have a high potential of application in artificial precipitation technologies. The correlation between the concentration of silicon dioxide and silver iodide precursors and morphological, structural and textural, rheological characteristics of the synthesized AgI-MCM41 HPs was studied. Most attention is paid to the formation of a hexagonal crystal structure (β-form, Iodargyrite) of silver iodide and maintaining maximum development (high values of specific surface area) for the AgI-MCM41 system. The phase state of AgI and MCM41 in the hybrid composition was studied by scanning electron microscopy. The optimal component ratio necessary for the formation of
the hexagonal structure of silver iodide was estimated. Such parameters as the value of specific surface area, pore volume and pore size were taken into account in the study of surface development. Sorption isotherms are described. Morphological features of the obtained AgI-MCM41 HPs were studied by scanning electron microscopy. A number of rheological parameters (such as volatility, fluidity) for synthesized powders was investigated, which allow predicting their performance properties. The condensation capabilities of the synthesized AgI-MCM41 HPs are described.