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Mechanistic insight into pyrene removal by natural sepiolites

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Abstract

This paper investigates the sorption characteristics and mechanisms of pyrene onto two types of natural sepiolite-brown (B-Sep) and white (W-Sep). The effects of relevant properties such as clay content, surface area, pore diameter and volume, divalent cations, and organic carbon content were investigated by single component batch adsorption systems. The results suggest that pyrene has high affinity for both sepiolite and its sorption behavior could be mainly affected by exchangeable strongly hydrated cations such as Ca2+ and H2O in the zeolite-like channels and by open channel defects (OCD) structures but no so much by the large number of Si-OH groups located on the sepiolite’s basal surfaces. Mesoporosity rather than surface area largely controls the sorption capacity and intensity of both sepiolites. This is shown by the increase in pore volume that exhibited the greatest increase in BET surface area. Particle size and morphological changes of both sepiolites following pyrene adsorption determined by FE-SEM showed that the sepiolite fibers are much longer than their widths, which are only several laths (several nanometers). This is a result of growth, mostly along the c-axis, at the expense of the diffusion of pyrene molecules through aqueous solution. As a consequence, a significant fibrous morphology is produced following the adsorption of pyrene by both sepiolites.

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Acknowledgments

This research was supported by The Scientific and Technological Research Council of Turkey (TUBITAK) within the scope of International Postdoctoral Research Fellowship Programme. The work was undertaken in The Department of Civil & Environmental Engineering, University of Surrey, UK.

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  1. Department of Mining Engineering, Faculty of Engineering, Afyon Kocatepe University, 03200, Afyonkarahisar, Turkey

    Eyüp Sabah

  2. Department of Civil and Environmental Engineering, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, UK

    Sabeha Ouki

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Sabah, E., Ouki, S. Mechanistic insight into pyrene removal by natural sepiolites. Environ Sci Pollut Res 24, 21680–21692 (2017). https://doi.org/10.1007/s11356-017-9524-1

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