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Mechanistic insight into pyrene removal by natural sepiolites

Sabah, E and Ouki, Sabeha (2017) Mechanistic insight into pyrene removal by natural sepiolites Environmental Science and Pollution Research, 24 (27). pp. 21680-21692.

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Eyup Sabah & sabeha Ouki ESPR-D-17-00244_R1 (1).pdf - Accepted version Manuscript
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Sabah & Ouki Supplementary material(revised).pdf - Accepted version Manuscript
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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 behaviour 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 nanometres). 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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
NameEmailORCID
Sabah, EUNSPECIFIEDUNSPECIFIED
Ouki, SabehaS.Ouki@surrey.ac.ukUNSPECIFIED
Date : 29 July 2017
Identification Number : 10.1007/s11356-017-9524-1
Copyright Disclaimer : The final publication is available at Springer via http://dx.doi.org/10.1007/s11356-017-9524-1
Uncontrolled Keywords : Natural sepiolite Pyrene Adsorption Porous adsorbent Mechanistic Aqueous systems
Depositing User : Melanie Hughes
Date Deposited : 03 Aug 2017 10:56
Last Modified : 04 Oct 2017 08:03
URI: http://epubs.surrey.ac.uk/id/eprint/841833

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