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Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water

Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water
Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water
The preparation and testing of thiol-functionalised silica-coated magnetite nanoparticles (TF-SCMNPs) is described. The characteristics of these particles are assessed at different stages in the production process using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and a magnetometer. The particles were found to be almost spherical with a uniform mesoporous structure with a pore size of ?2.1 nm. The particles were strongly responsive to an external magnetic field making separation from solution possible in less than 1 min. The adsorption characteristics of the particles were quantified in a series of isotherm experiments using Hg(II) solution concentrations between 40 and 1000 ?g l?1 at adsorbent concentrations of 4 and 8 mg l?1. The adsorption capacity was higher than for other commonly used adsorbents with 90% of Hg(II) removed during the first 5 min and equilibrium in less than 15 min. Both the Langmuir and Freundlich isotherm models were applied to the isotherm data and the maximum adsorption capacity was achieved when the ratio of adsorbent to adsorbate was low. Both temperature and pH had an effect on adsorption but when the TF-SCMNPs were used for removal of Hg(II) from tap water and bottled water, which contained other ions, there appeared to be no interference. Hg(II) could be successfully desorbed using thiourea in a 3 M HCl solution; this did not result in the destruction of the nanoparticles and they could subsequently be reused without loss of their activity in repetitive adsorption tests.
0043-1354
3913-3922
Hakami, Othman
aca77a89-5fda-4553-851a-b88f479f0161
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Hakami, Othman
aca77a89-5fda-4553-851a-b88f479f0161
Zhang, Yue
69b11d32-d555-46e4-a333-88eee4628ae7
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f

Hakami, Othman, Zhang, Yue and Banks, Charles J. (2012) Thiol-functionalised mesoporous silica-coated magnetite nanoparticles for high efficiency removal and recovery of Hg from water. Water Research, 46 (12), 3913-3922. (doi:10.1016/j.watres.2012.04.032).

Record type: Article

Abstract

The preparation and testing of thiol-functionalised silica-coated magnetite nanoparticles (TF-SCMNPs) is described. The characteristics of these particles are assessed at different stages in the production process using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier Transform Infrared Spectroscopy (FTIR), and a magnetometer. The particles were found to be almost spherical with a uniform mesoporous structure with a pore size of ?2.1 nm. The particles were strongly responsive to an external magnetic field making separation from solution possible in less than 1 min. The adsorption characteristics of the particles were quantified in a series of isotherm experiments using Hg(II) solution concentrations between 40 and 1000 ?g l?1 at adsorbent concentrations of 4 and 8 mg l?1. The adsorption capacity was higher than for other commonly used adsorbents with 90% of Hg(II) removed during the first 5 min and equilibrium in less than 15 min. Both the Langmuir and Freundlich isotherm models were applied to the isotherm data and the maximum adsorption capacity was achieved when the ratio of adsorbent to adsorbate was low. Both temperature and pH had an effect on adsorption but when the TF-SCMNPs were used for removal of Hg(II) from tap water and bottled water, which contained other ions, there appeared to be no interference. Hg(II) could be successfully desorbed using thiourea in a 3 M HCl solution; this did not result in the destruction of the nanoparticles and they could subsequently be reused without loss of their activity in repetitive adsorption tests.

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TF-SCMNPs_for_high_efficiency_removal_and_recovery_of_Hg_from_water___Hakami_et_al,_scholar_text.pdf - Accepted Manuscript
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Published date: August 2012
Organisations: Centre for Environmental Science

Identifiers

Local EPrints ID: 343498
URI: http://eprints.soton.ac.uk/id/eprint/343498
ISSN: 0043-1354
PURE UUID: 3e1abbc2-46d4-4878-a907-f6292cc97e54
ORCID for Yue Zhang: ORCID iD orcid.org/0000-0002-5068-2260

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Date deposited: 08 Oct 2012 11:07
Last modified: 17 Dec 2019 01:49

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Author: Othman Hakami
Author: Yue Zhang ORCID iD

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