Removal of PFOS using polypropylene coated with amphiphilic cyclodextrins
Year: 2024
Type: conference-paper
Abstract: Per- and polyfluoroalkyl substances (PFAS) are a group of manmade organofluoride compounds, which are bio accumulative, environmentally persistent and toxic to humans [1]. Membranes with low molecularweight cut-off (NF and RO) have shown high retention of PFAS. However, the filtration is energy intensive and has low water recovery [2]. The use of higher molecular-weight cut-off membranes (UF and MF) combined with the selective adsorbent cyclodextrins, should offer the possibility of a selective PFAS capture with both highly efficient removal, low energy consumption and complete water recovery. The modification of polymeric materials with cyclodextrins can be obtained by a simple and fast coating method [3]. Amphiphilic cyclodextrins (ACDs) with different degree of substitution (DS) were synthesised and immobilized on non-woven polypropylene cloth by dip coating for 10s in a mixture of ACD, ethanol and water. Ethanol/water ratios of 20/80, 70/30 and 90/10 were investigated for each ACD, representing an unstable suspension, stable suspension and solution, respectively. The removal of perfluorooctanesulfonic acid (PFOS) was investigated in a static adsorption experiment, where the removed concentration after 1h was determined. It was demonstrated that the ACD coated polypropylene has a PFOS removal which is approximately 25 times higher than the non-coated polypropylene.
Institution: Aalborg University
Language: English
Subfield: Environmental Chemistry
Field: Environmental Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W4412217367