Shaha Chironjit Kumar, Karmaker Subarna, Saha Tapan Kumar
Department of Chemistry, Jahangirnagar University, Savar, Dhaka, 1342, Bangladesh.
Veterinary Drug Residue Analysis Division, Institute of Food and Radiation Biology, Atomic Energy Research Establishment (AERE), Gonokbari, Savar, Dhaka, 1349, Bangladesh.
Heliyon. 2024 Nov 10;10(22):e40319. doi: 10.1016/j.heliyon.2024.e40319. eCollection 2024 Nov 30.
Water pollution by antibiotic residues poses a potential threat to environmental and human health. Graphene-based materials are highly stable, recyclable and effective adsorbents for efficiently removing antibiotics from polluted water. In this study, the adsorption behavior of levofloxacin onto sulfonated graphene oxide (SGO) was investigated by varying the contact period, solution pH, adsorbent quantity, levofloxacin concentration, inorganic ions, and solution temperature. Spectroscopic and microscopic techniques were employed to confirm the adsorptive interaction between levofloxacin and SGO. The adsorption process was most accurately characterized by the pseudo-second-order kinetic model and the Langmuir isotherm model, as indicated by their high correlation coefficients ( ) and low root-mean-square error (RMSE) values. The maximal quantity of levofloxacin that can be adsorbed onto SGO was determined to be 1250 μmol/g at pH 4 and 25 °C using the Langmuir model. Thermodynamic studies reveal that the process of levofloxacin adsorption onto SGO is endothermic and spontaneous in nature. Taking into consideration the results of adsorption, desorption and regeneration studies, it is proposed that SGO can be applied as an economic viable agent for the adsorptive removal of levofloxacin from the aqueous environment.
抗生素残留造成的水污染对环境和人类健康构成潜在威胁。基于石墨烯的材料是高效、稳定、可回收的吸附剂，能有效去除污水中的抗生素。本研究通过改变接触时间、溶液pH值、吸附剂用量、左氧氟沙星浓度、无机离子和溶液温度，研究了左氧氟沙星在磺化氧化石墨烯（SGO）上的吸附行为。采用光谱和显微镜技术证实了左氧氟沙星与SGO之间的吸附相互作用。吸附过程最准确地由伪二级动力学模型和朗缪尔等温线模型表征，其相关系数高且均方根误差（RMSE）值低。使用朗缪尔模型确定，在pH值为4和25℃时，SGO对左氧氟沙星的最大吸附量为1250μmol/g。热力学研究表明，左氧氟沙星在SGO上的吸附过程是吸热的且自发的。考虑到吸附、解吸和再生研究的结果，建议将SGO用作从水环境中吸附去除左氧氟沙星的经济可行剂。
