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.
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Research Article|
August 21 2014
Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers
Jun Chen
;
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
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Xiaoqin Hong
;
Xiaoqin Hong
1
School of Chemistry and Chemical Engineering, Institute of Molecular Engineering & Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Qingdong Xie
;
Qingdong Xie
1
School of Chemistry and Chemical Engineering, Institute of Molecular Engineering & Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Diankai Li
;
Diankai Li
2
School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan 243002, China
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Qianfeng Zhang
Qianfeng Zhang
1
School of Chemistry and Chemical Engineering, Institute of Molecular Engineering & Applied Chemistry, Anhui University of Technology, Ma'anshan 243002, China
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Water Sci Technol (2014) 70 (7): 1236-1243.
Article history
Received:
June 08 2014
Accepted:
August 06 2014
Citation
Jun Chen, Xiaoqin Hong, Qingdong Xie, Diankai Li, Qianfeng Zhang; Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers. Water Sci Technol 1 October 2014; 70 (7): 1236–1243. doi: https://doi.org/10.2166/wst.2014.361
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Jun Chen, Xiaoqin Hong, Qingdong Xie, Diankai Li, Qianfeng Zhang; Highly efficient removal of chromium(VI) from aqueous solution using polyaniline/sepiolite nanofibers. Water Sci Technol 1 October 2014; 70 (7): 1236–1243. doi: https://doi.org/10.2166/wst.2014.361
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