Amine-functionalized silica particles with magnetic core as magnetically removable adsorbents of Ag(I) ions

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 Fe 3 O 4 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.

Green wastewater treatment of repurposed COVID-19 therapy (levofloxacin) using synthesized magnetite pectin nanoparticles, comparison with mesoporous silica nanoparticles

“…On the other hand, the coated Fe 3 O 4 showed a value of – 27 mV reflecting the negative charge imparted by the pectin coated and the enhanced stability of the colloidal dispersion relative to bare particles. For comparison purpose the Zp values of the mesoporous silica was measured to be − 17.7 mV in agreement with the values reported in literature [ 36 , 37 ].…”

Efficient removal of aqueous Pb(II) using partially reduced graphene oxide-Fe3O4

“…Various methods including chemical precipitation, ion exchange, membrane separation, flocculation, electrolysis, and adsorption (Canivet et al., 2014; Gdula et al., 2017; Manisha, 2013) were employed for treating heavy metal pollution. Among these methods, adsorption technique is considered to be one of the most promising strategies because of its safe, low-cost, simple, and efficient merits.…”

Application of Response Surface Methodology and Desirability Function in the Optimization of Adsorptive Remediation of Arsenic from Acid Mine Drainage Using Magnetic Nanocomposite: Equilibrium Studies and Application to Real Samples

“…This is because they have a high surface area-to-volume ratio that enables a much greater extraction capacity and efficiency as well as an easily modifiable surface functionality to improve the selectivity [21,22]. These nanoadsorbents include functionalized poly(glycidyl methacrylate) [23], functionalized nickel-iron oxide nanoparticles [24], starch-bridged magnetite nanoparticles [10] and amine functionalized silica particles with a magnetic core [25].…”