Preliminary selection of clay minerals for the removal of pharmaceuticals, bisphenol A and triclosan in acidic and neutral aqueous solutions

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  • Katarzyna Styszko, AGH University of Science and Technology, Faculty of Energy Research and Fuels, Department of Coal Chemistry and Environmental Sciences, Krakow
  • ,
  • Katarzyna Nosek, AGH University of Science and Technology, Faculty of Energy Research and Fuels, Department of Coal Chemistry and Environmental Sciences, Krakow, Polen
  • Monika Motak, AGH University of Science and Technology, Department of Fuels Technology, Danmark
  • Kai Bester

Abstract Pharmaceuticals, personal care products and endocrine disruptors demonstrate huge potential to cause adverse ecological health effects at very low concentration in aquatic environment. There is a need to improve current purification technologies used in sewage and drinking-water treatment plants. This article aims at providing new insights into the recent development of natural and modified clay-based sorbents for the removal of aqueous contaminants such as pharmaceuticals and personal care products. The removal of six widely used pharmaceuticals: ibuprofen, diclofenac, ketoprofen, carbamazepine, as well as endocrine disrupting chemicals - bisphenol A and a bactericidal agent, triclosan - was examined by sorption onto eight adsorbents. Sorption was performed using natural and modified clay minerals - montmorillonite (Mt), vermiculite (VER), bentonite (B), kaolinite (K), commercial acid activated montmorillonites K10 and K30, and two carbonaceous-mineral nanocomposites, MtG5%T, BAlG3%C. This study showed that among the tested natural clays, vermiculite is the most promising sorbent for the removal of pharmaceuticals in purification processes. Among the modified clay minerals, the best results were achieved for carbonaceous bentonite and two acid activated montmorillonites K10 and K30. However, the removal of acidic pharmaceuticals on montomorillonite K10 and carbonaceous bentonite was strongly dependent on the pH value. In the case of vermiculite and acid-modified montmorillonite K30, the sorption of the selected compounds was not significantly affected by pH, which is crucial in wastewater treatment. The sorption constant divided by the specific surface area (Kd/A) is proposed to assess whether the surface area or chemical properties of the materials control the sorption process. Kd/A values were relatively high in the case of vermiculite, so it should be noticed that individual and specific surface properties of vermiculite were of crucial importance for sorption.

OriginalsprogEngelsk
Artikelnummer4095
TidsskriftComptes Rendus Chimie
Vol/bind18
Nummer10
Sider (fra-til)1134-1142
Antal sider9
ISSN1631-0748
DOI
StatusUdgivet - 1 okt. 2015
BegivenhedInternational Symposium on Air & Water Pollution Abatement Catalysis: Catalytic pollution control for stationary and mobile sources - AGH University of Science and Technology, Kraków, Polen
Varighed: 1 sep. 20145 sep. 2014

Konference

KonferenceInternational Symposium on Air & Water Pollution Abatement Catalysis
LokationAGH University of Science and Technology
LandPolen
ByKraków
Periode01/09/201405/09/2014

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