Sistanizadeh Aghdam Mohammad, Cheraghi Mehrdad, Sobhanardakani Soheil, Mohammadi Ali Akbar, Lorestani Bahareh
Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran.
Department of Environmental Health Engineering, Neyshabur University of Medical Sciences, Neyshabur, Iran.
Sci Rep. 2025 Feb 11;15(1):5112. doi: 10.1038/s41598-025-89322-4.
Pharmaceuticals are known as challenging class of water pollutants that threaten worldwide waterbodies. Even in negligible concentrations, antibiotics could lead to the development of antibiotic resistance genes. In environmental and health protection against antibiotics, adsorption is a promising technique, and designing effective, sustainable, and non-toxic adsorbents is crucial. Herein, a magnetic chitosan@Ag-multiwalled carbon nanotube nanocomposite (MC@Ag-MWCN) was synthesized and applied to eliminate a common antibiotic ciprofloxacin (CIP) from aqueous solutions. FESEM, TEM, XRD and FTIR, techniques characterized the as-synthesized MC@Ag-MWCN. The study evaluates the efficacy of the various key factors such as pH, varied initial CIP concentrations, nanocomposite doses and contact time in CIP uptake. Experimental equilibrium and kinetic data were analyzed utilizing four commonly used isotherm models: Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. Notably, the Langmuir isotherm model fitted best to CIP removal data by MC@Ag-MWCN with a qe of 31.26 mg/g. Also, the adsorption data correlated well with the pseudo-second-order kinetics model. Adsorption mechanism the removal of CIP using the MC@Ag-MWCN nanocomposite occurs through a combination of physical and chemical interactions, facilitated by the composite's structural and chemical properties. In conclusion, MC@Ag-MWCN shows promising adsorptive characteristics against recalcitrant antibiotic CIP.
药物被认为是一类具有挑战性的水污染物，威胁着全球水体。即使浓度极低，抗生素也可能导致抗生素抗性基因的产生。在针对抗生素的环境和健康保护方面，吸附是一种很有前景的技术，设计有效、可持续且无毒的吸附剂至关重要。在此，合成了一种磁性壳聚糖@银-多壁碳纳米管纳米复合材料（MC@Ag-MWCN），并将其应用于从水溶液中去除常见抗生素环丙沙星（CIP）。采用场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）技术对合成的MC@Ag-MWCN进行了表征。该研究评估了pH值、不同的初始CIP浓度、纳米复合材料剂量和接触时间等各种关键因素对CIP吸附的效果。利用四种常用的等温线模型：朗缪尔（Langmuir）、弗伦德利希（Freundlich）、坦金（Temkin）和杜宾宁-拉杜舍维奇（Dubinin-Radushkevich）对实验平衡和动力学数据进行了分析。值得注意的是，朗缪尔等温线模型最适合MC@Ag-MWCN去除CIP的数据，qe为31.26 mg/g。此外，吸附数据与准二级动力学模型相关性良好。吸附机制利用MC@Ag-MWCN纳米复合材料去除CIP是通过物理和化学相互作用的结合实现的，这得益于复合材料的结构和化学性质。总之，MC@Ag-MWCN对难降解抗生素CIP显示出有前景的吸附特性。
