Adsorptive Removal of Cadmium and Copper from Water by Mesoporous Silica Functionalized with N-(Aminothioxomethyl)-2-Thiophen Carboxamide
Publication: Journal of Environmental Engineering
Volume 139, Issue 10
Abstract
Copper and cadmium ions were removed from aqueous solutions by adsorption onto a new organic-inorganic hybrid material. N-(aminothioxomethyl)-2-thiophen carboxamide (TAC) was covalently anchored on SBA-15 mesoporous silica. Various characterization techniques [X-ray diffraction, nitrogen adsorption-desorption, thermogravimetric analysis, , nuclear magnetic resonance (NMR), and Fourier-transform infrared (FTIR) spectroscopy] have proved that the organic ligand was successfully anchored and the ordering of the inorganic support was preserved during the chemical modifications. Metal cations in aqueous solution were adsorbed onto this material with multichelating atoms by a complexation mechanism. Adsorption capacity for the divalent copper and cadmium cations were 0.74 and , respectively. Cu(II) was selectively eliminated from contaminated water with Cu(II) and Cd(II). TAC-functionalized silica sorbent presented a good regeneration capacity without significantly losing its adsorption capacity and could be used for the development of an in-flow wastewater purification technology.
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Acknowledgments
I. Georgescu wishes to acknowledge the EURODOC ‘‘Doctoral Scholarships for research performance at European level’’ project for support.
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Published In
Journal of Environmental Engineering
Volume 139 • Issue 10 • October 2013
Pages: 1285 - 1296
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© 2013 American Society of Civil Engineers.
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Received: Nov 12, 2012
Accepted: May 22, 2013
Published online: May 24, 2013
Published in print: Oct 1, 2013
Discussion open until: Oct 24, 2013
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