Abstract
Adsorption together with size exclusion and charge attraction/repulsion has to be taken into account when considering removal of pharmaceuticals as emerging contaminants from water by reverse osmosis and nanofiltration membranes. Glucocorticosteroids (hydrocortisone (HYDRO), dexamethasone (DEXA)), anesthetics (procaine, lidocaine) with relatively weak hydrophobicities (1 < log K O/W < 3), and membranes (XLE, LFC–1, CPA3, SWC1, NF90, and NF270) have been investigated in this study. Adsorption was studied by measuring the concentration of compounds in feed and permeate and by monitoring changes in membrane flux in the batch mode operation during 24 h. A decrease in the feed concentrations for HYDRO and DEXA (log K O/W < 2) was observed. The loss of these compounds in feed was associated with irreversible adsorption onto an NF270 and a CPA3 membrane. Therefore, when considering removal of pharmaceuticals with lower hydrophobicity, adsorption has to be particularly taken into account for membranes with bigger pores in the selective layer. Also, a high dipole moment and low water solubility affected adsorption on the membranes. For smaller and slightly more hydrophobic pharmaceuticals (log K O/W > 2), an increase in the feed concentration was obtained. Firstly, these compounds instantly adsorbed to the membrane. Secondly, the compounds diffused through the polymer matrix and desorbed to the permeate side after equilibrium had been reached.
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Acknowledgments
This work has been supported by the Croatian Ministry of Science, Education and Sports Projects: 125-1253008-3009, Membrane and adsorption processes for removal of organic compounds in water treatment; 125-1253008-1350, Advanced analytical methods for pharmaceuticals determination in the environment; and Bilateral project HR-SLO, Determination of toxicity and physico-chemical properties of pharmaceuticals.
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Dolar, D., Košutić, K. & Ašperger, D. Influence of Adsorption of Pharmaceuticals onto RO/NF Membranes on Their Removal from Water. Water Air Soil Pollut 224, 1377 (2013). https://doi.org/10.1007/s11270-012-1377-0
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DOI: https://doi.org/10.1007/s11270-012-1377-0