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Micropollutants pre‐concentration using adsorption–desorption cycles: application to chlorinated paraffins and alkyl‐phenol derivatives
Author(s) -
Patiño Yolanda,
Díaz Eva,
Ordóñez Salvador
Publication year - 2017
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5083
Subject(s) - adsorption , desorption , chemistry , activated carbon , carbon nanotube , alkyl , phenol , chemical engineering , graphite , chromatography , organic chemistry , engineering
BACKGROUND Pre‐concentration of two different emerging pollutants – an endocrine disruptor and a chlorinated paraffin – was carrxbied out by adsorption/desorption cycles onto carbonaceous materials – activated carbon (GF‐40), multiwall carbon nanotubes (MWCNT) and a high surface area graphite (HSAG‐500). The breakthrough curves were modeled by Bed Depth Service Time (BDST), Thomas and Yoon‐Nelson models. RESULTS MWCNT presents for both compounds the highest normalized adsorption capacity. Although GF‐40 offers 100% elution efficiency, no pre‐concentration was obtained with this adsorbent. In contrast, pre‐concentration was reached with MWCNT and HSAG‐500. The best results were obtained with MWCNT, with a pre‐concentration factor of 3.4 for 1,8‐dichlorooctane and 2.8 for 2‐(4‐methylphenoxy)ethanol. BDST and Thomas models can predict the adsorption capacity and Yoon‐Nelson the time required to reach the 50% adsorbate breakthrough. CONCLUSIONS Pre‐concentration was reached using MWCNT and HSAG‐500 as adsorbent. MWCNT is the best adsorbent, since this material presents the highest normalized adsorption capacity and concentration factor. © 2016 Society of Chemical Industry