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Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions

1
Department of Petroleum and Natural Gas Technology, Technological Educational Institute of Kavala, Kavala 65404, Greece
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Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
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Materials 2013, 6(1), 184-197; https://doi.org/10.3390/ma6010184
Received: 13 November 2012 / Revised: 6 January 2013 / Accepted: 8 January 2013 / Published: 10 January 2013
The present study presents the effective use of nanocrystalline akaganeite for the adsorption of an anionic (SDS), a cationic (CTAB), and a nonionic (tween80) surfactant from wastewater. Equilibrium experiments, as well as thermodynamic analysis, were performed. The maximum SDS adsorption occurs at the lowest pH value (5), the opposite is observed for CTAB (pH = 11), while for tween80, the change of pH value did not affect the adsorption. The equilibrium data could be described by Freundlich and Langmuir isotherms. The maximum adsorption capacity at 25 °C (pH = 8) was 823.96 mg/g for SDS, 1007.93 mg/g for CTAB, and 699.03 mg/g for tween80. The thermodynamic parameters revealed the exothermic and spontaneity nature of the process. Also, FTIR measurements established that surfactants are adsorbed on the surface of akaganeite, replacing adsorbed water. View Full-Text
Keywords: akaganeite; removal; adsorption; surfactant akaganeite; removal; adsorption; surfactant
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Kyzas, G.Z.; Peleka, E.N.; Deliyanni, E.A. Nanocrystalline Akaganeite as Adsorbent for Surfactant Removal from Aqueous Solutions. Materials 2013, 6, 184-197.

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