|
authors |
Lourenco, MAO; Figueira, P; Pereira, E; Gomes, JRB; Lopes, CB; Ferreira, P |
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nationality |
International |
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journal |
CHEMICAL ENGINEERING JOURNAL |
|
author keywords |
Adsorption; Hybrid materials; Periodic mesoporous organosilicas; Mercury; Water treatment |
|
keywords |
HEAVY-METAL IONS; PHENYLENE-SILICA; ORGANIC GROUPS; AQUEOUS-MEDIA; LARGE-PORE; ADSORPTION; ADSORBENT; HG(II); REMEDIATION; FRAMEWORKS |
|
abstract |
Pristine, amino monofunctionalized and amino and thiol bifunctionalized phenylene-bridged periodic mesoporous organosilicas (Ph-PMO) were synthetized by a simple methodology without any protection/deprotection steps. The Ph-PMO materials were characterized and their potential as new sorbents for Hg(II) was investigated for low-contamination scenarios. The materials have well-ordered mesostructures as confirmed by powder X-ray diffraction and transmission electron microscopy analyses. C-13 and Si-29 solid-state NMR confirm the amination of the phenylene bridge of the simple Ph-PMO to form the amine-functionalized PMO (NH2-Ph-PMO) and the grafting of the thiol silylated ligand to the free silanols of the NH2-Ph-PMO to obtain the bifunctional (NH2-Ph-PMO-SH). For the initial conditions tested, the bifunctional material showed excellent Hg(II) removal efficiency (98%) and Hg(II) uptake time (30 min). The sorption kinetics were also investigated by three of the most studied kinetic models, and the pseudo-second-order kinetic model was the one that better described the kinetic sorption process of Hg(II) ions onto all PMO. (C) 2017 Elsevier B.V. All rights reserved. |
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publisher |
ELSEVIER SCIENCE SA |
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issn |
1385-8947 |
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isbn |
1873-3212 |
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year published |
2017 |
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volume |
322 |
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beginning page |
263 |
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ending page |
274 |
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digital object identifier (doi) |
10.1016/j.cej.2017.04.005 |
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web of science category |
Engineering, Environmental; Engineering, Chemical |
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subject category |
Engineering |
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unique article identifier |
WOS:000401594200027
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