Simple, mono and bifunctional periodic mesoporous organosilicas for removal of priority hazardous substances from water: The case of mercury(II)
authors Lourenco, MAO; Figueira, P; Pereira, E; Gomes, JRB; Lopes, CB; Ferreira, P
nationality International
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.
publisher ELSEVIER SCIENCE SA
issn 1385-8947
isbn 1873-3212
year published 2017
volume 322
beginning page 263
ending page 274
digital object identifier (doi) 10.1016/j.cej.2017.04.005
web of science category Engineering, Environmental; Engineering, Chemical
subject category Engineering
unique article identifier WOS:000401594200027
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journal impact factor 6.735
5 year journal impact factor 6.496
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