Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers

Jun Chen; Xiaoqin Hong; Qingdong Xie; Diankai Li; Qianfeng Zhang

doi:10.2166/wst.2014.361

Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers

Water Sci Technol. 2014;70(7):1236-43. doi: 10.2166/wst.2014.361.

Authors

Jun Chen¹, Xiaoqin Hong¹, Qingdong Xie¹, Diankai Li², Qianfeng Zhang¹

Affiliations

¹ School of Chemistry and Chemical Engineering, Institute of Molecular Engineering & Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China E-mail: junchen@ahut.edu.cn.
² School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China.

PMID: 25325549
DOI: 10.2166/wst.2014.361

Abstract

Polyaniline/sepiolite (PANI/sepiolite) nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. The effect of aniline/sepiolite weight ratio on the nanostructure of PANI/sepiolite composites was investigated by field-emission scanning electron microscopy. The adsorption of Cr(VI) onto the PANI/sepiolite nanofibers was highly dependent on pH values. The pseudo-second-order and Langmuir isothermal models can well describe the adsorption kinetics and adsorption isotherm, respectively. The maximum adsorption capacity of the PANI/sepiolite nanofibers for Cr(VI) was up to 206.6 mg/g at 25 °C and increased with the increase in temperature. Desorption experiments indicated that PANI/sepiolite can be regenerated and reused for two consecutive cycles with no loss of its removal efficiency. PANI/sepiolite nanofibers can be used as a highly efficient and economically viable adsorbent for Cr(VI) removal due to their excellent adsorption characteristics.