Comparative studies on structural, magnetic and adsorptive properties of fused Fe2O3@ SiO2and rattle shapedSiO2@Fe2O3nanospheres with reversal of core-shell

Synthesis of core-shell nanocomposites is an important domain due to their applications as nanoadsorbents for heavy metal ions. In the present work, rattle type SiO2@Fe2O3 core-shell nanospheres were synthesized by surfactant assisted direct precipitation of SiO2 on Fe2O3 nanoparticles. Whereas, fus...

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Bibliographic Details
Published in:Materials chemistry and physics 2020-02, Vol.242, p.122548, Article 122548
Main Authors: Kaur, Jaskirat, kaur, Manpreet
Format: Article
Language:English
Subjects:
Adsorption
Adsorptivity
Cd(II) ion
Comparative studies
Core-shell reversal
Fe2O3–SiO2
Heavy metals
Ions
Magnetic properties
Metal ions
Morphology
Nanocomposites
Nanoparticles
Nanospheres
Silicon dioxide
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Summary:Synthesis of core-shell nanocomposites is an important domain due to their applications as nanoadsorbents for heavy metal ions. In the present work, rattle type SiO2@Fe2O3 core-shell nanospheres were synthesized by surfactant assisted direct precipitation of SiO2 on Fe2O3 nanoparticles. Whereas, fused magnetic nanospheres encapsulating mesoporous silica cores i.e. Fe2O3@SiO2 were formed by sonication method. Different techniques viz. SEM-EDX, TEM, XRD, BET and VSM were used for the confirmation of structure, crystallinity, surface morphology and magnetic properties of nanospheres. Effect of pH, contact time, adsorbent dose and temperature on Cd(II) adsorption was evaluated. The experimental data was fitted using Langmuir, Freundlich and D-R isotherm models. Monolayer adsorption efficiency (qm) for Fe2O3@SiO2 (769.0 mgg−1) was higher than SiO2@Fe2O3 (370.0 mgg−1) nanospheres, signifying better adsorption of Fe2O3@SiO2. The results confirmed that the reversal of core-shell can play an important role to effectively tune the properties of Fe2O3–SiO2 nanospheres for efficient removal of heavy metal ions. [Display omitted] •Core-shell reversal of Fe2O3–SiO2 nanospheres was successfully achieved.•Rattle type SiO2@Fe2O3 and fused core-shell Fe2O3@SiO2 nanospheres were formed.•Fe2O3@SiO2nanospheres displayed higher removal efficiency for Cd(II) ions than SiO2@Fe2O3 nanospheres.•Adsorption isotherms, kinetics and thermodynamic studies were performed to explain the observed trend.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2019.122548