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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 6, 2013
Accepted March 25, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Functionalized nanostructured silica by tetradentate-amine chelating ligand as efficient heavy metals adsorbent : Applications to industrial effluent treatment

Afsaneh Shahbazi Habibollah Younesi^1† Alireza Badiei²

Environmental Sciences Research Institute, Shahid Beheshti University, G.C., Tehran 1983963113, Iran ¹Department of Environmental Science, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, P. O. Box 46414-356, Noor, Iran ²School of Chemistry, College of Science, University of Tehran, P. O. Box 14155-6455, Tehran, Iran

Korean Journal of Chemical Engineering, September 2014, 31(9), 1598-1607(10), 10.1007/s11814-014-0089-0

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Abstract

Organofunctionalized nanostructured silica SBA-15 with tri(2-aminoethyl)amine tetradentate-amine ligand was synthesized and applied as adsorbent for the removal of Cu2+, Pb2+, and Cd2+ from both synthetic wastewater and real paper mill and electroplating industrial effluents. The prepared materials were characterized by XRD, N2 adsorption-desorption, TGA, and FT-IR analysis. The Tren-SBA-15 was found to be a fast adsorbent for heavy metal ions from single solution with affinity for Cu2+, Pb2+, than for Cd2+ due to the complicated impacts of metal ion electronegativity. The kinetic rate constant decreased with increasing metal ion concentration due to increasing of ion repulsion force. The equilibrium batch experimental data is well described by the Langmuir isotherm. The maximum adsorption capacity was 1.85 mmol g^(-1) for Cu2+, 1.34 mmol g^(-1) for Pb2+, and 1.08 mmol g^(-1) for Cd2+ at the optimized adsorption conditions (pH=4, T=323 K, t=2 h, C0=3 mmol L^(-1), and adsorbent dose=1 g L^(-1)). All Gibbs energy was negative as expected for spontaneous interactions, and the positive entropic values from 103.7 to 138.7 J mol^(-1) K^(-1) also reinforced this favorable adsorption process in heterogeneous system. Experiment with real wastewaters showed that approximately a half fraction of the total amount of studied metal ions was removed within the first cycle of adsorption. Hence, desorption experiments were performed by 0.3M HCl eluent, and Tren-SBA-15 successfully reused for four adsorption/desorption cycles to complete removal of metal ions from real effluents. The regenerated Tren-SBA-15 displayed almost similar adsorption capacity of Cu2+, Pb2+, and Cd2+ even after four recycles. The results suggest that Tren-SBA-15 is a good candidate as an adsorbent in the removal of Cu2+, Pb2+, and Cd2+ from aqueous solutions.

Keywords

SBA-15 Heavy Metal Ion Removal Regeneration Isotherm Kinetic Thermodynamics

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