Sorption of the emerging pollutant oxytetracycline on eggshell. Experimental and theoretical approaches

IF 6.3 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
M.L. Montes, M.A. Taylor, R.E. Alonso
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引用次数: 0

Abstract

The constant use of drugs for health treatments increases the presence of antibiotics, analgesics, antipyretics and hormones in wastewater and water bodies, negatively affecting the biosphere. Among the emerging pollutant sources, the main are wastewater, hospital effluents, agriculture, animal breeding and improper management of industrial effluents. Therefore, it is essential to develop or adapt methods to remove these pollutants from environmental matrices. This work studies experimental and theoretically the removal of the widely used antibiotic oxytetracycline (OTC) from water through its sorption by a globally abundant solid waste: eggshell (ES). Experimentally, the OTC sorption by ES powders has been performed at different OTC concentrations. The obtained isotherm has been fitted by the Langmuir, Freundlich and Sips models. Theoretically, first principles calculations to model the OTC molecule on different CaCO3 surfaces were done. Experimentally the maximum sorption capacity was 15 ± 3 mg/g at RT, disclosed by the best model representing the data, the Langmuir one at a single site. Theoretically OTC sorption involves the interaction between Ca2 + of ES and O atoms of OTC. Therefore, ES waste is a promising material for low-cost remediation technologies based on the sorption process for the treatment of waters containing OTC.

Abstract Image

新出现的污染物土霉素在蛋壳上的吸附。实验和理论方法
由于不断使用药物进行健康治疗,废水和水体中的抗生素、镇痛药、解热镇痛药和激素的含量不断增加,对生物圈造成了负面影响。在新出现的污染源中,主要是废水、医院污水、农业、动物饲养和工业废水的不当管理。因此,必须开发或调整各种方法来清除环境基质中的这些污染物。本研究通过实验和理论研究了全球大量固体废物蛋壳(ES)对水中广泛使用的抗生素土霉素(OTC)的吸附去除。实验中,在不同的 OTC 浓度下,ES 粉末对 OTC 进行了吸附。获得的等温线与 Langmuir、Freundlich 和 Sips 模型相吻合。理论上,对不同 CaCO3 表面上的 OTC 分子进行了第一性原理计算。实验结果表明,在 RT 条件下,最大吸附容量为 15 ± 3 mg/g。理论上,OTC 吸附涉及 ES 的 Ca2 + 与 OTC 的 O 原子之间的相互作用。因此,对于基于吸附过程的低成本修复技术而言,ES 废物是一种很有前途的材料,可用于处理含有 OTC 的水体。
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来源期刊
Applied Surface Science
Applied Surface Science 工程技术-材料科学:膜
CiteScore
12.50
自引率
7.50%
发文量
3393
审稿时长
67 days
期刊介绍: Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.
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