Abstract
Adsorption of silver ions over amine-functionalized silica particles with magnetic core has been studied. This adsorbent has been synthesized via sol–gel method, in the presence of Fe3O4 particles as magnetic cores. As a comparison, magnetic silica adsorbent with non-functionalized surface was also synthesized. As-obtained materials have been characterized by elemental analysis, acid–base titration, nitrogen sorption measurements, X-ray photoelectron spectroscopy and scanning electron microscopy. What is more, parameters of electrical double layer at the silica adsorbent/electrolyte solution interface were also examined. Kinetic of adsorption and isotherms of silver ions were determined. The obtained adsorption of Ag(I) ions for the studied materials was in the range of about 0.2–0.3 mmol/g.
Highlights
Keywords Magnetic nanoparticles, silica, core/shell particles, amine-functional groups, Ag(I) ions adsorption
In order to create silica layer onto as-synthesized magnetite nanoparticles, sol–gel method was employed (Mel’nik et al, 2012; Melnyk et al, 2016). This method is based on the hydrolysis and co-condensation of tetraethyl orthosilicate and a proper organosilane-containing amine-functional groups ((3-Aminopropyl)triethoxysilane), in the presence of catalyst
The process of surrounding the magnetic cores by silica shell leads to decrease spherical shape and causes higher polydispersity of the core/shell silica particles (Figure 1(b) and (c)). Such phenomenon could be explained that the generating silica shell on the surface of magnetic cores covers single magnetite particle and its aggregates formed due to strong magnetic interactions between Fe3O4 particles
Summary
Keywords Magnetic nanoparticles, silica, core/shell particles, amine-functional groups, Ag(I) ions adsorption Adsorption onto silica materials with magnetic core. Two adsorbents were synthesized: properties of functionalized with amine groups material (A) were compared with its pristine counterpart (S).
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