Volume: 2, 2023
2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland:
ENVIRONMENT – PLANT – ANIMAL – PRODUCT
Abstract number: E005
DOI: https://doi.org/10.24326/ICDSUPL2.E005
Published online: 19 April 2023
ICDSUPL, 2, E005 (2023)
Modified zeolite materials NaX and NaA as adsorbents for sulfamethoxazole
Monika Białoszewska1*, Lidia Bandura1, Wojciech Franus1
1 Department of Geotechnical Sciences, Faculty of Civil Engineering and Architecture, Lublin University of Technology, Nadbystrzycka 40, 20-618 Lublin, Poland
* Corresponding author: m.bialoszewska@pollub.pl
Abstract
The use of antibiotics has reduced mortality and morbidity from epidemic and infectious diseases. This benefits were thought to be more important than their toxicity. This fact is a major reason for the overconsumption of antibiotics, which have contributed to the spread of antibiotic-resistant bacteria (ARBs) in the environment. It is necessary to develop effective methods of removing antibiotics and adsorption is one of them. Popular adsorbents are zeolites, which are crystalline aluminosilicates. However, it is necessary to modify their surface to improve sorption properties towards organic compounds. An example of interesting modifiers are cyclodextrins, which are cup-shaped cyclic oligosaccharides with a hydrophobic interior and hydrophilic exterior, capable to form host-guest inclusion complexes. The aim of this study was to modify fly ash-derived zeolites NaX and NaA using β-cyclodextrin, and to evaluate the sorption capacity of NaX-CD and NaA-CD towards sulfamethoxazole (SMX). All materials were characterized using XRD, SEM, FTIR and N2 adsorption/desorption isotherms. The effect of pH, dosage, contact time and initial concentration were studied as well as adsorption efficacy after 5 cycles of regeneration. XRD analysis indicates no destructive effect of the modification on the zeolites structure, while FTIR and SEM confirm the effectiveness of the modification. The highest removal level of SMX on the NaX-CD (46-47%) was obtained at pH=4.5-5, while on the NaA-CD 40-42% at pH=2.4-2.8. The sorption equilibrium established after 3h and 2h for NaX-CD and NaA-CD, respectively. The isotherm data showed the best correlation with the Freundlich model, indicating multilayer adsorption on a heterogeneous adsorbent surface. Ethanol regeneration studies confirmed reusability of hybrid materials, preserving their sorption properties. To summarize, modified zeolite made from waste fly ash can be applied alternatively to other adsorbents (e.g., carbon-based) for removing organic pollutants from aqueous media.
The „Fly ash as the precursors of functionalized materials for applications in environmental engineering, civil engineering and agriculture” no. POIR.04.04.00-00-14E6/18-00 project is carried out within the TEAM-NET programme of the Foundation for Polish Science co-financed by the European Union under the European Regional Development Fund.
How to cite
M. Białoszewska, L. Bandura, W. Franus, 2023. Modified zeolite materials NaX and NaA as adsorbents for sulfamethoxazole. In: 2nd International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL2.E005