Issue 56, 2014

Polyaniline coating on carbon fiber fabrics for improved hexavalent chromium removal

Abstract

Carbon fabrics (CFs) loaded with 5.0, 10.0, 15.0 and 20.0 wt% polyaniline (PANI) (PANI/CF) prepared by soaking carbon fiber fabrics in 1.0 wt% PANI m-cresol solution have demonstrated superior hexavalent chromium (Cr(VI)) removal performance compared to the as-received CFs. The PANI/CF nanocomposites were noticed to remove Cr(VI) from solutions with an initial Cr(VI) concentration of 1.0 mg L-1 within 15 min, which is faster than the conventional active carbon (6 h) and the as-received CFs (>1 h). A better Cr(VI) removal efficiency was observed in the acidic solutions than in the basic solutions. A pseudo-second-order behavior was justified for the PANI/CF with a much higher removal rate (0.06 g mg-1 min-1) than the reported ~0.03 g mg-1 min-1 for the active carbon. The adsorption isotherm study demonstrated that the adsorbents follow the Langmuir model with a calculated maximum adsorption capacity of 18.1 mg g-1 for the 10.0 wt% PANI/CF. The Cr(VI) removal mechanisms explored by FT-IR and XPS involve the reduction of Cr(VI) to Cr(III) by PANI. The PANI/CF adsorbents have demonstrated easy recycling capability for up to five cycles with a Cr(VI) removal rate at above 91%.

Graphical abstract: Polyaniline coating on carbon fiber fabrics for improved hexavalent chromium removal

Supplementary files

Article information

Article type
Paper
Submitted
26 Feb 2014
Accepted
19 Jun 2014
First published
19 Jun 2014

RSC Adv., 2014,4, 29855-29865

Polyaniline coating on carbon fiber fabrics for improved hexavalent chromium removal

B. Qiu, C. Xu, D. Sun, H. Wei, X. Zhang, J. Guo, Q. Wang, D. Rutman, Z. Guo and S. Wei, RSC Adv., 2014, 4, 29855 DOI: 10.1039/C4RA01700E

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