García-Criado Noelia, Martín-Pozo Laura, Martín Julia, Santos Juan Luis, Aparicio Irene, Alonso Esteban
Departamento de Química Analítica, Escuela Politécnica Superior, Universidad de Sevilla, E-41011 Seville, Spain.
Antibiotics (Basel). 2025 Apr 10;14(4):395. doi: 10.3390/antibiotics14040395.
The persistence of tetracycline residues in aquatic environments poses substantial risks to ecosystems and public health, emphasizing the need for effective removal strategies. This study examines the use of purified stevensite (ST), a natural clay mineral, as an efficient and cost-effective adsorbent for removing tetracycline antibiotics from contaminated water. Batch experiments were conducted to assess the adsorption kinetics, isotherms, and influence of environmental factors. Material characterization studies were performed before and after tetracycline adsorption. ST demonstrated optimal removal efficiency at an acidic pH, achieving over 99% elimination of both tetracyclines and their metabolites at an adsorbent dose of 2 g L and antibiotic concentration of 5 mg L. Equilibrium was reached within 30 min. Regeneration experiments confirmed that ST retained over 90% of its adsorption capacity after five adsorption-desorption cycles. Surface characterization revealed that ST's large surface area, high cation exchange capacity, and potential for hydrogen bonding may explain its high adsorption capabilities. The material was tested on real samples of tap water, surface water, and wastewater, demonstrating an effective removal rate over 99%. With its high efficiency, low cost and favourable reusability, purified ST is a promising option for large-scale wastewater treatment, contributing to safer water resources and improved environmental protection.
四环素残留物在水生环境中的持久性对生态系统和公众健康构成了重大风险，这凸显了有效去除策略的必要性。本研究考察了纯化的片钠铝石（ST），一种天然粘土矿物，作为从受污染水中去除四环素类抗生素的高效且经济有效的吸附剂的应用。进行了批量实验以评估吸附动力学、等温线以及环境因素的影响。在四环素吸附前后进行了材料表征研究。ST在酸性pH值下表现出最佳去除效率，在吸附剂剂量为2 g/L和抗生素浓度为5 mg/L时，对四环素及其代谢物的去除率均超过99%。30分钟内达到平衡。再生实验证实，经过五个吸附-解吸循环后，ST保留了其超过90%的吸附容量。表面表征表明，ST的大表面积、高阳离子交换容量以及氢键形成潜力可能解释了其高吸附能力。该材料在自来水、地表水和废水的实际样品上进行了测试，去除率超过99%。由于其高效、低成本和良好的可重复使用性，纯化的ST是大规模废水处理的一个有前景的选择，有助于实现更安全的水资源和更好的环境保护。
