Removal of Levofloxacin with Three- Dimensional Magnetic Nanoadsorbent based on Graphene Oxide Functionalized with Melamine and Chitosan Dialdehyde: Adsorption Isotherm and Kinetic Studies
Subject Areas : Environment Pullotion (water and wastewater)hafez germani nejad 1 , Amir hessam Hassani 2 * , Homayon Ahmad Panahi 3 , Elham Moniri 4
1 - Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran.
2 - Department of Environmental Engineering, Faculty of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran. *(Corresponding Author)
3 - Department of Chemistry, Islamic Azad University, Central Tehran Branch, Tehran, Iran.
4 - Department of Chemistry, Islamic Azad University, Varamin (Pishva) Branch, Varamin, Iran.
Keywords: Magnetic nanoadsorbent, Fe3O4 nanoparticles, Graphene oxide, Melamine, Chitosan, Levofloxacin, Water pollution,
Abstract :
Background and Objective: Pollution of water resources and the environment by antibiotics is one of the most concerning environmental issues. The most important problems caused by these contaminations are the resistance of bacteria to antibiotics. So, one of the most important health concerns is the removal of antibiotics such as levofloxacin (LEV) from water resources. One of the most important techniques for the removal of antibiotics from water resources is nanoadsorbents.
Material and Methodology: This study focuses on the synthesis of a new graphene oxide-based three-dimensional magnetic nanoadsorbent (3D/Fe/GO/ME/DCS), grafted onto melamine (ME) and chitosan dialdehyde (DCS), and utilized for the efficient removal of LEV from aqueous solutions. The synthesized nanoadsorbent was characterized by scanning electron microscope, x-ray diffraction, Fourier transform infrared spectroscopy, thermal gravimetric analysis, and vibrating sample magnetometer.
Findings: The effects of various parameters such as pH (3-11), initial LEV concentration (1-50 mg L-1), and the amount of adsorbent dosage (0.5-2 g L-1) on the removal efficiency were investigated. The Langmuir model best described the isotherm results (R2 = 0.9947), while the pseudo-second-order model best described the kinetic results (R2 = 0.9996).
Discussion and Conclusion: The maximum adsorption capacity for LEV was 9.72 mg g−1 with an initial concentration of 5 mg L−1 at pH = 7, the adsorbent dosage of 1 g L−1, and contact time of 30 min. According to the obtained data, the prepared nanoadsorbent can be a used for the removal of LEV from aqueous solutions.
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