Journal
RSC ADVANCES
Volume 2, Issue 29, Pages 11007-11018Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ra21991c
Keywords
-
Categories
Funding
- National Science Foundation-Chemical and Biological Separation under the EAGER program [CBET 11-37441]
- Texas Hazardous Waste Research Center
- NSF [DMR 10-05764]
- China Scholarship Council (CSC) program
Ask authors/readers for more resources
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-1 p-toluene sulfonic acid (PTSA) or 1.0 mol L-1 hydrochloric acid (HCl) and efficiently reused for further Cr(VI) removal.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available