Amino-functionalized silica magnetite nanoparticles for the simultaneous removal of pollutants from aqueous solution

•New functionalized magnetic sorbent was synthesized by the assistance of ultrasound.•Sorbent can be regenerated and recovered easily by magnetic separation.•Fast simultaneous removal of RB5 and SDBS was achieved for the first time.•Pseudo-second-order model was fitted well for the kinetics of adsor...

Full description

Saved in:
Bibliographic Details
Published in:Applied surface science 2015-04, Vol.333, p.68-77
Main Authors: Hozhabr Araghi, Samira, Entezari, Mohammad H.
Format: Article
Language:English
Subjects:
Adsorption
Amino-functionalized silica magnetite
Aqueous solutions
Magnetite
Nanoparticles
Organic pollutants
Pollutants
Silicon dioxide
Sorbents
Surface chemistry
Ultrasound
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:•New functionalized magnetic sorbent was synthesized by the assistance of ultrasound.•Sorbent can be regenerated and recovered easily by magnetic separation.•Fast simultaneous removal of RB5 and SDBS was achieved for the first time.•Pseudo-second-order model was fitted well for the kinetics of adsorption.•The rate constant of adsorption for SDBS was higher than RB5. Amino-functionalized silica magnetite nanoparticles (A-S-MNPs) have been prepared through coating of sono-synthesized magnetite nanoparticles (MNPs) in a basic medium by SiO2. Then, the resultant silica magnetite nanoparticles (S-MNPs) were modified with 3-aminpropyltriethoxysilane (APTES). The modification was carried out by the organic solvent method in dry hexane to graft amine groups on the surface. The adsorption behavior of this novel magnetic sorbent was studied for the simultaneous removal of two organic pollutants containing the sulfonate group, e.g., Reactive Black 5 (RB5) and sodium dodecylbenzenesulfonate (SDBS) in aqueous solutions. The results show that a pseudo-second-order model fits well the experimental data and the rate constant of adsorption for SDBS is higher than for RB5. The adsorption capacity was obtained by the Langmuir isotherm. The qmax was 83.33 and 62.5mg/g for RB5 and SDBS at pH 2 and 298K, respectively. Furthermore, the loaded A-S-MNPs can be recovered easily from aqueous solution by magnetic separation and regenerated by simply washing with 0.1M NaOH solution. Therefore, the synthesized novel magnetic sorbent can be used as an effective and recyclable adsorbent for the simultaneous removal of dye and surfactant from aqueous solutions.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.01.211