Natural and modified clays as low-cost and ecofriendly materials to remove salinomycin from environmental compartments

作者：Samiha Hamdi, Ainoa Míguez-González, Raquel Cela-Dablanca, Ana Barreiro, María J. Fernández‐Sanjurjo, Avelino Núñez‐Delgado, Esperanza Álvarez‐Rodríguez · 发表于：Journal of Environmental Management · 年份：2024 · DOI：10.1016/j.jenvman.2024.122158 · 被引用次数：10 · 研究领域：Pharmaceutical and Antibiotic Environmental Impacts、Synthesis and Biological Evaluation、Antimicrobial agents and applications

Antibiotics in the environment represent a substantial pollution threat. Among these emerging pollutants, ionophore anticoccidials are of special concern due to their potential ecological impact, persistence in the environment, and role in promoting antimicrobial resistance. To investigate the adsorption/desorption of the ionophore antibiotic salinomycin (SAL) on/from raw and modified clay adsorbents, batch-type experiments were performed using 0.5 g of clay adsorbent mixed with 10 mL of increasing doses of SAL solutions for each sample, at room temperature, with a contact time of 24 h. All measurements were conducted in triplicate employing HPLC-UV equipment. Three different natural (raw) and modified clay samples were investigated, which were denominated as follows: AM (with 51% calcite), HJ1 (with 32% kaolinite), and HJ2 (with 32% microcline). The experiments were carried out using three pH ranges: between 3.33 and 4.49 for acid-activated clays, 8.39–9.08 for natural clays, and 9.99–10.18 for base-activated clays. The results indicated that, when low concentrations of the antibiotic were added (from 5 to 20 μmol L −1 ), more than 98% of SAL was strongly adsorbed by almost all clays, irrespective of the physicochemical and mineralogical composition of the clays or their pH values. When higher SAL concentrations were added (40 and 100 μmol L −1 ), the adsorption of the antibiotic showed pH-dependent ligand adsorption mechanisms: (i) highly decreased as the pH raised (for the...