Journal
JOURNAL OF CHEMICAL AND ENGINEERING DATA
Volume 59, Issue 7, Pages 2275-2282Publisher
AMER CHEMICAL SOC
DOI: 10.1021/je500319a
Keywords
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Funding
- National Natural Science Foundation of China [21207001]
- Natural Science Fund of Anhui Provincial Education committee of P. R. China [KJ2012Z036]
- Anhui Province College Outstanding Young Talent Fund of P.R. China [2012SQRL032ZD]
- National Undergraduate Training Programs for Innovation and Entrepreneurship [201310360026]
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Polypyrrole-sepiolite nanofibers were prepared by in situ chemical oxidation polymerization in the presence of sepiolite. The nanostructure of PPy-sepiolite nanofibers was confirmed by field-emission scanning electron microscopy. The adsorption of Cr(VI) onto the PPy-sepiolite nanofibers was highly pH dependent and the adsorption kinetics followed the pseudo-second-order model. The Langmuir isothermal model well described the adsorption isotherm data and the maximum adsorption capacity increased with the increase of temperature. The maximum adsorption capacity of the PPy-sepiolite nanofibers for Cr(VI) was up to 302 mg.g(-1) at 25 degrees C. Thermodynamic investigation indicated that the adsorption process is spontaneous and endothermic. Desorption experiment showed PPy-sepiolite can be regenerated and reused for four consecutive cycles without obvious loss of its removal efficiency. The excellent adsorption characteristic of PPy-sepiolite will render it a highly efficient and economically viable adsorbent for Cr(VI) removal.
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