אסיף מאגר המחקר החקלאי

Removal of diclofenac potassium from wastewater using clay-micelle complex

Year:

2012

Source of publication :

Authors :

Volume :

33

Co-Authors:

Karaman, R., Faculty of Pharmacy, Al-Quds University, Jerusalem, Israel
Khamis, M., Department of Chemistry and Chemical Technology, Al-Quds University, Jerusalem, Israel
Quried, M., Centre of Chemical and Biological Analysis, Al-Quds University, Israel, Department of Agriculture, Forestry and Environment, University of Basilicata, Via dell'Ateneo Lucano 10, 85100, Potenza, Italy
Halabieh, R., Department of Chemistry and Chemical Technology, Al-Quds University, Jerusalem, Israel
Makharzeh, I., Department of Chemistry and Chemical Technology, Al-Quds University, Jerusalem, Israel
Manassra, A., Department of Chemistry and Chemical Technology, Al-Quds University, Jerusalem, Israel
Abbadi, J., Centre of Chemical and Biological Analysis, Al-Quds University, Israel
Qtait, A., Faculty of Pharmacy, Al-Quds University, Jerusalem, Israel
Bufo, S.A., Department of Agriculture, Forestry and Environment, University of Basilicata, Via dell'Ateneo Lucano 10, 85100, Potenza, Italy
Nasser, A., Institute of Soil, Water and Environmental Sciences, Volcani Centre, Bet Dagan, Israel
Nir, S., Department of Soil and Water Sciences, R.H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Rehovot 76100, Israel

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Abstract:

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 100m 3. © 2012 Taylor & Francis.

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