Volume: 1, 2022
1st International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: ENVIRONMENT  – PLANT  – ANIMAL  – PRODUCT

Abstract number: E007

DOI: https://doi.org/10.24326/ICDSUPL1.E007

Published online: 26 April 2022

ICDSUPL, 1, E007 (2022)

Goethite coating with polyanions and polycations – zeta potential study

Magdalena Medykowska1*, Katarzyna Szewczuk-Karpisz2, Katarina Jerin3, Davor Kovačević3, Małgorzata Wiśniewska1

1 Department of Radiochemistry and Environmental Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, Maria Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland

2 Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland

3 Division of Physical Chemistry, Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, HR-1001 Zagreb, Croatia

* Corresponding author:  m.medykowska@poczta.umcs.lublin.pl


The aim of the conducted research was to obtain a novel material capable of removing soil contaminants. This is particularly relevant to the current situation where we are struggling with environmental degradation, exacerbated by human activities related to various types of industry and intensive agriculture. Goethite is a common and widespread mineral occurring in in many regions of Poland; it is also present in the USA, Germany, Great Britain, the Czech Republic, Slovakia, Algeria, Morocco, Canada, and Russia. During the experiments, goethite was coated with polymer (polyelectrolyte) layers, which allowed to create new adsorbent materials with different properties. One anionic polymer – poly(4-styrenesulfonate) (PSS) and one cationic polymer – poly(diallyldimethylammonium) (PDADMAC) were selected for this purpose. Both polyelectrolytes are popular and readily available, making the application potential of this research relatively high. The coating process was monitored based on the changes in the zeta potential of the goethite suspensions. For these measurements, the zeta potential analyzer “Zeta Plus” (BROOKHAVEN INSTRUMENTS CORPORATION) was used. Moreover, to adjust the appropriate pH of the system for the coating process a lab pH meter (METROHM 827) with combined micro electrode 6.0234.100 3M KCl was used. The change in the sign of zeta potential of goethite observed after the adsorption process confirmed the formation of polymer layer on the surface of solid particles. For example, at pH 5 the zeta potential of the goethite sample without polyelectrolyte was equal to +20.9 mV, with adsorbed PSS – -57.3 mV, whereas with PSS+PDADMAC layers – +53.4 mV. This type of research can contribute to the development of adsorbents based on natural solids with much better properties than uncoated minerals.

How to cite

M. Medykowska, K. Szewczuk-Karpisz, K. Jerin, D. Kovačević, M. Wiśniewska, 2022. Goethite coating with polyanions and polycations – zeta potential study. In: 1st International PhD Student’s Conference at the University of Life Sciences in Lublin, Poland: Environment – Plant – Animal – Product. https://doi.org/10.24326/ICDSUPL1/E007

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