Laboratoire de Recherche: Caractérisations, Applications Et Modélisation de Matériaux, Faculté Des Sciences de Tunis, Université de Tunis El Manar, Campus universitaire El Manar, Tunis, Tunisia.
Laboratoire d'Automatique, de Génie Des Procédés Et de Génie Pharmaceutique, Université de Lyon 1, UMR 5007 CNRS, 43 bd 11 Novembre, 69622, Villeurbanne, France.
Environ Sci Pollut Res Int. 2022 Nov;29(55):83112-83125. doi: 10.1007/s11356-022-21647-3. Epub 2022 Jun 27.
The presence of antibiotics as micro-contaminants in the water and aqueous environments is a health concern to humans and the ecosystem. Therefore, their elimination by adsorption to available and cheap materials in water treatment plants is a research topic of high relevance. The present paper reports on the adsorption behavior of oxytetracycline on a bio-adsorbent prepared from Posidonia oceanica; an abundant Mediterranean biomass. Characterization of the pretreated Posidonia biomaterial was achieved using several analyses such as Boehm acid-base titration method, pH determination, and analysis techniques (FTIR, C CP-MAS NMR, optical microscopy, and TGA). The pH occurred around pH 2.11. Posidonia biomaterial showed a fast and high uptake rate throughout the adsorption process, which is a definite advantage for analytical applications such as water decontamination. The experimental kinetic data fitted very rightly the pseudo-second-order kinetic model and the equilibrium uptake can adopt the bi-Langmuir isotherm model for all studied pH values which assumes adsorptions at the two localized sites. Maximum adsorption capacities of 11.8 mg∙g and 4.4 mg∙g for the two adsorption sites are reached at pH 6. The oxytetracycline adsorption process onto Posidonia bio-adsorbent is spontaneous (ΔG < 0), exothermic (ΔH < 0), and entropically favorable (ΔS > 0). The effect of pH on adsorption behavior and the thermodynamic parameters of adsorption are consistent with a possible origin of adsorption of oxytetracycline by means of hydrogen bonding interactions between surface hydroxyl and phenolic groups of the biomaterial and oxytetracycline. The proposed green and environmentally friendly biomaterial offers potential benefits as a bio-adsorbent in the remediation of aquatic environments contaminated by various organic materials.
抗生素作为微污染物存在于水和水生态环境中，对人类和生态系统的健康构成了威胁。因此，通过吸附到水处理厂中可用且廉价的材料中来消除抗生素是一个具有高度相关性的研究课题。本文报道了从波西多尼亚海草中制备的生物吸附剂对土霉素的吸附行为；波西多尼亚海草是一种丰富的地中海生物量。预处理后的波西多尼亚生物材料通过几种分析进行了表征，例如Boehm 酸碱滴定法、pH 值测定和分析技术（FTIR、CP-MAS NMR、光学显微镜和 TGA）。pH 值约为 2.11。波西多尼亚生物材料在整个吸附过程中表现出快速和高的吸附速率，这对于水净化等分析应用具有明显的优势。实验动力学数据非常符合准二级动力学模型，平衡吸附可以采用双 Langmuir 等温线模型来描述，该模型假设在两个局部位置进行吸附。在所有研究的 pH 值下，两个吸附位点的最大吸附容量分别达到 11.8mg∙g 和 4.4mg∙g。土霉素在波西多尼亚生物吸附剂上的吸附过程是自发的（ΔG < 0）、放热的（ΔH < 0）和熵有利的（ΔS > 0）。pH 值对吸附行为和吸附热力学参数的影响与土霉素通过生物材料表面羟基和酚基团与土霉素之间的氢键相互作用进行吸附的可能来源一致。这种绿色环保的生物材料作为一种生物吸附剂，在修复受各种有机材料污染的水生态环境方面具有潜在的益处。
