Experimental data and modeling of sulfadiazine adsorption onto raw and modified clays from Tunisia

Samiha Hamdi; Mohamed Mosbahi; Manel Issaoui; Ana Barreiro; Raquel Cela-Dablanca; Jihen Brahmi; Ali Tlili; Faker Jamoussi; María J Fernández-Sanjurjo; Avelino Núñez-Delgado; Esperanza Álvarez-Rodríguez; Hakima Gharbi-Khelifi

doi:10.1016/j.envres.2024.118309

Experimental data and modeling of sulfadiazine adsorption onto raw and modified clays from Tunisia

Environ Res. 2024 May 1:248:118309. doi: 10.1016/j.envres.2024.118309. Epub 2024 Jan 30.

Affiliations

¹ Department of Biotechnology, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, 9100, Sidi Bouzid, Tunisia; Department Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002 Lugo, Spain; Laboratory of Nutrition - Functional Foods and Health (NAFS)-LR12ES05, Faculty of Medicine, University of Monastir, Avenue Avicenne, 5019, Monastir, Tunisia; Laboratory of Transmissible Diseases and Biologically Active Substances LR99ES27 Faculty of Pharmacy of Monastir, University of Monastir, Avenue Avicenne, 5019, Monastir, Tunisia. Electronic address: samihahamdi2020@gmail.com.
² Dpartment of Geology, GEOGLOB Research Unit, Faculty of Science and Technology of Sfax, Sokra Street 3038 Sfax, Tunisia.
³ Department of Biotechnology, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, 9100, Sidi Bouzid, Tunisia; Laboratory of Nutrition - Functional Foods and Health (NAFS)-LR12ES05, Faculty of Medicine, University of Monastir, Avenue Avicenne, 5019, Monastir, Tunisia.
⁴ Department Soil Science and Agricultural Chemistry, Engineering Polytechnic School, University of Santiago de Compostela, 27002 Lugo, Spain.
⁵ Department of Biotechnology, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, 9100, Sidi Bouzid, Tunisia.
⁶ Georesources Laboratory, CERTE, Borj Cedria, Bp 273, 8020, Solimen, Tunisia.
⁷ Department of Biotechnology, Faculty of Science and Technology of Sidi Bouzid, University of Kairouan, 9100, Sidi Bouzid, Tunisia; Laboratory of Transmissible Diseases and Biologically Active Substances LR99ES27 Faculty of Pharmacy of Monastir, University of Monastir, Avenue Avicenne, 5019, Monastir, Tunisia.

PMID: 38301763
DOI: 10.1016/j.envres.2024.118309

Abstract

In recent years, the increasing detection of emerging pollutants (particularly antibiotics, such as sulfonamides) in agricultural soils and water bodies has raised growing concern about related environmental and health problems. In the current research, sulfadiazine (SDZ) adsorption was studied for three raw and chemically modified clays. The experiments were carried out for increasing doses of the antibiotic (0, 1, 5, 10, 20, and 40 μmol L^-1) at ambient temperature and natural pH with a contact time of 24 h. The eventual fitting to Freundlich, Langmuir and Linear adsorption models, as well as residual concentrations of antibiotics after adsorption, was assessed. The results obtained showed that one of the clays (HJ1) adsorbed more SDZ (reaching 99.9 % when 40 μmol L^-1 of SDZ were added) than the other clay materials, followed by the acid-activated AM clay (which reached 99.4 % for the same SDZ concentration added). The adsorption of SDZ followed a linear adsorption isotherm, suggesting that hydrophobic interactions, rather than cation exchange, played a significant role in SDZ retention. Concerning the adsorption data, the best adjustment corresponded to the Freundlich model. The highest Freundlich KF scores were obtained for the AM acid-treated and raw HJ1 clays (606.051 and 312.969 Lⁿ μmol^1-n kg^-1, respectively). The Freundlich n parameter ranged between 0.047 and 1.506. Regarding desorption, the highest value corresponded to the AM clay, being generally <10 % for raw clays, <8 % for base-activated clays, and <6 % for acid-activated clays. Chemical modifications contributed to improve the adsorption capacity of the AM clay, especially when the highest concentrations of the antibiotic were added. The results of this research can be considered relevant as regard environmental and public health assessment since they estimate the feasibility of three Tunisian clays in SDZ removal from aqueous solutions.

Keywords: Adsorption; Antibiotics; Chemical modification; Clays; Desorption; Sulfadiazine.

MeSH terms

Adsorption
Anti-Bacterial Agents*
Clay
Sulfadiazine*
Tunisia

Substances

Clay
Sulfadiazine
Anti-Bacterial Agents