Batch Adsorption and Mechanism of Cr(VI) Removal from Aqueous Solution by Polyaniline/Humic Acid Nanocomposite
Publication: Journal of Environmental Engineering
Volume 137, Issue 12
Abstract
Polyaniline (PANI) and humic acid (HA) composite sorbents were prepared by adding different amount of HA into the chemical oxidation process of PANI. The sorbents were characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and adsorption and desorption. Batch adsorption results showed that the sorbent PANI/HA-1 had the best affinity to Cr(VI) in aqueous solution. The adsorption kinetics results of Cr(VI) indicated that the adsorption reached equilibrium within 120 min, and adsorption rate could be described by pseudo second order kinetics. Sorption of Cr(VI) onto PANI/HA-1 fitted the Freundlich adsorption model better than the Langmuir adsorption model. The results of zeta potential measurement and batch experiments showed that the PANI/HA-1 was stable in the pH range of 4–7. The desorption results indicated NaOH eluent had better desorption rate than HCl eluent. The electrochemical-controlled desorption result showed that the loaded Cr(VI) on the PANI/HA-1 could be removed from the matrix, although the desorption rate was not as high as using the eluents. An adsorption mechanism was proposed on the basis of X-ray photoelectron spectroscopy (XPS) and zeta potential measurement results.
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Acknowledgments
This work was supported by the Foundation of The State Key Laboratory of Pollution Control and Resource Reuse of China, and the Scientific Research Foundation of Graduate School of Nanjing University. We are grateful to the anonymous reviewers for their valuable suggestions.
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Published In
Journal of Environmental Engineering
Volume 137 • Issue 12 • December 2011
Pages: 1158 - 1164
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Aug 30, 2010
Accepted: Jun 27, 2011
Published online: Jun 29, 2011
Published in print: Dec 1, 2011
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