Synthesis of FeO@SiO₂–DNA core–shell engineered nanostructures for rapid adsorption of heavy metals in aqueous solutions

Abstract

Facile synthesis of well-dispersed and magnetic FeO@SiO2–DNA nanostructures with electrostatic active sites for interaction and rapid adsorption of heavy metals.

Environmental Sustainability Evaluation of Iron Oxide Nanoparticles Synthesized via Green Synthesis and the Coprecipitation Method: A Comparative Life Cycle Assessment Study

“…citratus extract for the green synthesis . From Figure a, an average diameter size of around 9 ± 4 nm was determined, whereas as shown in Figure b, the IONPs presented a similar average of 10 ± 4 nm . The crystal structure was corroborated corresponding to the planes of superparamagnetic iron metal oxides (Fe 3 O 4 and γ-Fe 2 O 3 phases) obtained from both methods.…”

“… 46 From Figure 1 a, an average diameter size of around 9 ± 4 nm was determined, 46 whereas as shown in Figure 1 b, the IONPs presented a similar average of 10 ± 4 nm. 47 The crystal structure was corroborated corresponding to the planes of superparamagnetic iron metal oxides (Fe 3 O 4 and γ-Fe 2 O 3 phases) obtained from both methods. Moreover, a dense agglomeration was observed due to the strong dipole–dipole interaction between nanoparticles, which is typical for IONPs with a high surface reactivity.…”

“…Moreover, a dense agglomeration was observed due to the strong dipole–dipole interaction between nanoparticles, which is typical for IONPs with a high surface reactivity. 46 , 47 …”

“…The crystal structure was corroborated corresponding to the planes of superparamagnetic iron metal oxides (Fe 3 O 4 and γ-Fe 2 O 3 phases) obtained from both methods. Moreover, a dense agglomeration was observed due to the strong dipole–dipole interaction between nanoparticles, which is typical for IONPs with a high surface reactivity. , …”

“…The coprecipitation reaction was carried out considering a 2:1 molar ratio of iron(III) and iron(II) chlorides, respectively. 47 Here, two 50 mL solutions of 0.52 M iron(III) and 0.26 M iron(II) were prepared individually and then mixed under mechanical stirring and heated up to 85 °C for 1 h. The pH was adjusted by adding 100 mL of 1 M NaOH solution. The purification process was the same one employed for the green synthesis, using washes with distilled water and ethanol, and centrifugation.…”