TY - JOUR
T1 - Removal of diclofenac potassium from wastewater using clay-micelle complex
AU - Karaman, Rafik
AU - Khamis, Mustafa
AU - Quried, Mohannad
AU - Halabieh, Rawan
AU - Makharzeh, Iman
AU - Manassra, Adnan
AU - Abbadi, Jehad
AU - Qtait, Alaa
AU - Bufo, Sabino Aurelio
AU - Nasser, Ahmed
AU - Nir, Shlomo
PY - 2012/6/1
Y1 - 2012/6/1
N2 - The presence of an ionized carboxyl group in the widely used non-steroidal anti-inflammatory (NSAID) drug diclofenac potassium results in a high mobility of diclofenac and in its low sorption under conditions of slow sand filtration or subsoil passage. No diclofenac degradation was detected in pure water or sludge during one month. Tertiary treatments of wastewater indicated that the effective removal of diclofenac was by reverse osmosis, but the removal by activated carbon was less satisfactory. This study presents an efficient method for the removal of diclofenac from water by micelle-clay composites that are positively charged, have a large surface area and include large hydrophobic domains. Adsorption of diclofenac in dispersion by charcoal and a composite micelle (otadecyltrimethylammonium [ODTMA] and clay [montmorillonite]) was investigated. Analysis by the Langmuir isotherm revealed that charcoal had a somewhat larger number of adsorption sites than the composite, but the latter had a significantly larger binding affinity for diclofenac. Filtration experiments on a solution containing 300ppm diclofenac demonstrated poor removal by activated carbon, in contrast to very efficient removal by micelle-clay filters. In the latter case the weight of removed diclofenac exceeded half that of ODTMA in the filter. Filtration of diclofenac solutions at concentrations of 8 and 80ppb yielded almost complete removal at flow rates of 30 and 60mLmin -1. One kilogram of ODTMA in the micelle-clay filter has been estimated to remove more than 99% of diclofenac from a solution of 100ppb during passage of more than 100m3.
AB - The presence of an ionized carboxyl group in the widely used non-steroidal anti-inflammatory (NSAID) drug diclofenac potassium results in a high mobility of diclofenac and in its low sorption under conditions of slow sand filtration or subsoil passage. No diclofenac degradation was detected in pure water or sludge during one month. Tertiary treatments of wastewater indicated that the effective removal of diclofenac was by reverse osmosis, but the removal by activated carbon was less satisfactory. This study presents an efficient method for the removal of diclofenac from water by micelle-clay composites that are positively charged, have a large surface area and include large hydrophobic domains. Adsorption of diclofenac in dispersion by charcoal and a composite micelle (otadecyltrimethylammonium [ODTMA] and clay [montmorillonite]) was investigated. Analysis by the Langmuir isotherm revealed that charcoal had a somewhat larger number of adsorption sites than the composite, but the latter had a significantly larger binding affinity for diclofenac. Filtration experiments on a solution containing 300ppm diclofenac demonstrated poor removal by activated carbon, in contrast to very efficient removal by micelle-clay filters. In the latter case the weight of removed diclofenac exceeded half that of ODTMA in the filter. Filtration of diclofenac solutions at concentrations of 8 and 80ppb yielded almost complete removal at flow rates of 30 and 60mLmin -1. One kilogram of ODTMA in the micelle-clay filter has been estimated to remove more than 99% of diclofenac from a solution of 100ppb during passage of more than 100m3.
KW - diclofenac potassium
KW - kinetic studies of NSAID agents
KW - micelle-clay complex
KW - removal of anti-inflammatory drugs
KW - wastewater treatment
UR - http://www.scopus.com/inward/record.url?scp=84862289807&partnerID=8YFLogxK
U2 - 10.1080/09593330.2011.619582
DO - 10.1080/09593330.2011.619582
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C2 - 22856300
AN - SCOPUS:84862289807
SN - 0959-3330
VL - 33
SP - 1279
EP - 1287
JO - Environmental Technology (United Kingdom)
JF - Environmental Technology (United Kingdom)
IS - 11
ER -