NDLI: Magnetic polyaniline nanocomposites toward toxic hexavalent chromium removal

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Magnetic polyaniline nanocomposites toward toxic hexavalent chromium removal

Content Provider	Royal Society of Chemistry (RSC)
Author	Wei, Suying Colorado, Henry A. Huang, Yudong Gu, Hongbo Haldolaarachchige, Neel Walters, Bryan Rapole, Sowjanya B. Sharma, Jaishri Luo, Zhiping Guo, Zhanhu Cao, Dongmei Young, David P.
Copyright Year	2012
Abstract	The removal of toxic hexavalent chromium (Cr(VI)) from polluted water by magnetic polyaniline (PANI) polymer nanocomposites (PNCs) was investigated. The PNCs were synthesized using a facile surface initiated polymerization (SIP) method and demonstrated unique capability to remove Cr(VI) from polluted solutions with a wide pH range. Complete Cr(VI) removal from a 20.0 mL neutral solution with an initial Cr(VI) concentration of 1.0–3.0 mg L−1 was observed after a 5 min treatment period with a PNC load of 10 mg. The PNC dose of 0.6 g L−1 was found to be sufficient for complete Cr(VI) removal from 20.0 mL of 9.0 mg L−1 Cr(VI) solution. The saturation magnetization was observed to have no obvious decrease after treatment with Cr(VI) solution, and these PNCs could be easily recovered using a permanent magnet and recycled. The Cr(VI) removal kinetics were determined to follow pseudo-first-order behavior with calculated room temperature pseudo-first-order rate constants of 0.185, 0.095 and 0.156 min−1 for the solutions with pH values of 1.0, 7.0 and 11.0, respectively. The Cr(VI) removal mechanism was investigated by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and energy-filter transmission electron microscopy (EFTEM). The results showed that PANI was partially oxidized after treatment with Cr(VI) solution, with Cr(VI) being reduced to Cr(III). The EFTEM observation indicated that the adsorbed Cr(III) had penetrated into the interior of the PNCs instead of simply adsorbing on the PNC surface. This synthesized material was found to be easily regenerated by 1.0 mol L−1p-toluene sulfonic acid (PTSA) or 1.0 mol L−1 hydrochloric acid (HCl) and efficiently reused for further Cr(VI) removal.
Starting Page	11007
Ending Page	11018
Page Count	12
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	2
Issue Number	29
Journal	RSC Advances
DOI	10.1039/c2ra21991c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Infrared spectroscopy PNC Stable isotope ratio Polymerization Polymer Fourier-transform infrared spectroscopy Photoemission spectroscopy Polyaniline Hydrochloric acid PNC Financial Services Transmission electron microscopy Fourier Saturation (magnetic) Chromium X-ray photoelectron spectroscopy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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