Ethyl Acetate—Propionic Acid as Green Mobile Phase System for Selective Densitometric Identification of Maltose with Preliminary Separation on Silica High-Performance Thin-Layer Chromatographic Plates

JPC – Journal of Planar Chromatography – Modern TLC - A mobile phase system comprising of ethyl acetate and propionic acid in 1:1 (v/v) ratio was identified as the most suitable green...     

Thin Layer Chromatography of Synthetic Dyes on Antimonic Acid and on Admixture of Antimonic Acid and Silica Gel ‘G’ in a Mixed Solvent System

Abstract

Thin layer chromatography of synthetic dyes have been performed on antimonic acid and on admixture of antimonic acid and silica gel ‘G’ in a mixed solvent system i. e. Butanol: Acetic acid: water (25:5:10). The separation potential of antimonic acid and silica gel ‘G’ has been explored. Several important separations of closely related dyes have been achieved as a result of such studies.     

Dynamic Adsorption and Desorption Behaviors of Cu(II), Ag(I), and Au(III) on Silica Gel Microspheres Encapsulated by Salicylic Acid–Functionalized Polystyrene

Composite material silica gel microspheres encapsulated by salicylic acid functionalized polystyrene(SG–PS–azo–SA) have been synthesized, and the dynamic adsorption and desorption properties of this silica gel matrix inorganic–organic composite material for Cu(II), Ag(I), and Au(III) have been investigated. The results displayed that SG–PS–azo–SA had excellent adsorption for Cu(II), and the film diffusion dominated the adsorption process of SG–PS–azo–SA for Cu(II), Ag(I), and Au(III). These metal ions could be desorbed with the eluent solution of 2.5 mol/L HCl, 3% thiourea in 0.5 mol/L HCl, and 0.5% thiourea in 1 mol/L HCl, respectively. When the elution was carried out for 30 min, 30 min, and 132 min, the desorption ratio ω could reach 91.1%, 99.4%, and 60.84%, respectively. Thus, silica gel encapsulated by polystyrene coupled with salicylic acid (SG–PS–azo–SA) is favorable and useful for the removal of metal ions Cu(II), Ag(I), and Au(III), and the high adsorption capacity make it a promising candidate material for the metal ions removal.