Directed Assembly of Bifunctional Silica–Iron Oxide Nanocomposite with Open Shell Structure

Abstract

The synthesis of nanocomposite with controlled surface morphology plays a key role for pollutant removal from aqueous environments. The influence of the molecular size of the polyelectrolyte in synthesizing silica-iron oxide core-shell nanocomposite with open shell structure was investigated by using dynamic light scattering, atomic force microscopy, and quartz crystal microbalance with dissipation (QCM-D). Here, poly(diallydimethylammonium chloride) (PDDA) was used to promote the attachment of iron oxide nanoparticles (IONPs) onto the silica surface to assemble a nanocomposite with magnetic and catalytic bifunctionality. High molecular weight PDDA tended to adsorb on silica colloid, forming a more extended conformation layer than low molecular weight PDDA. Subsequent attachment of IONPs onto this extended PDDA layer was more randomly distributed, forming isolated islands with open space between them. By taking amoxicillin, an antibiotic commonly found in pharmaceutical waste, as the model system, better removal was observed for silica-iron oxide nanocomposite with a more extended open shell structure.

Deposition behavior of residual aluminum in drinking water distribution system: Effect of aluminum speciation

“…The slope of ΔD to Δf was steepest with Al o , followed by Al 30 and Al 13 , which indicated that the deposited layer of Al 13 was the most rigid and a most soft dissipative film was formed for Al o . For Al 13 and Al 30 , with direct inspection, the slope of ΔD to Δf exhibited a linear relationship, which meant that no conformational alternation occurred during the deposition process (Che et al, 2014). With respect to Al o , the slope became larger with increasing | Δf | , which meant that the film became more loosely attached to the surface (Li et al, 2014).…”

Synergistic effects of nanoparticle heating and amoxicillin on H. pylori inhibition

“…[50] On the other hand, amoxicillin molecules were detected to have a zeta potential level showing small positive charges. [51] We postulate that Mn0.3Fe2.7O4@SiO2 NPs and amoxicillin can be coupled directly by electrostatic interactions to form amoxicillin loaded Mn0.3Fe2.7O4@SiO2. The zeta potential was measured to confirm the coupling.…”

Plantain Peel Mediated Green Synthesis Iron Oxide Nanoparticles, Surface Functionalization, and Them Performance towards Methylene Blue and Methyl Orange Dye Removal

“…As a result, chemical synthesis methods are exploited to synthesize FeONPs. The common ways to synthesize FeONPs chemically are co-precipitation [11], sol-gel method [12], microemulsion [13], thermal decomposition [14], and sonochemical synthesis [15]. Inevitably, there are also some drawbacks on it which are the adoption of toxic reducing agents such as sodium borohydride and hydrazine hydrate [16], and pollution caused by the iron precursor chemicals [10].…”