M. Adamczak, G. Kamińska, J. Bohdziewicz
Silesian University of Technology, Institute of Water and Wastewater Engineering, Gliwice, PL
INFLUENCE OF POLYMER AND CARBON NANOTUBES CONCENTRATION IN NANOCOMPOSITE POLYMER MEMBRNES FOR CAFFEINE RETENTION DURING ULTRAFILTRATION PROCESS
Caffeine is a substance that belongs to group of microcontaminants. However it is seen as relatively harmless and easy to decompose in environment. Furthermore caffeine achieve very high concentrations in surface waters so it is important to study the possibilities of its removal. This study presents the estimation of caffeine removal during ultrafiltration process. Within the framework of this research nanocomposite membranes were prepared from poly(ethersulfone) (PES) with addition of carboxylated single-walled carbon nanotubes (SWCNT-COOH). Modification of nanotubes concentration and contribution of polymer in membrane-forming solution allowed to achieve high caffeine retention with preservation of optimal flux during filtration. Caffeine rejection varied from 68% to 100%. It depended on separation properties of each membrane. Characteristic of studied membranes by the measurement of their porosity and hydrophilicity was also determined in this study.
Keywords: caffeine, ultrafiltration, carbon nanotubes, nanocomposite membranes