Title : Enhanced antibiotic detoxification from aqueous solution through graphene oxide adsorbents enriched with deep eutectic solvent
Abstract:
The persistent presence of antibiotics in aquatic environment has become a pressing environmental issue, particularly due to the risk of promoting antibacterial resistance, which can negatively impact both aquatic ecosystems and human health[1]. Traditional water treatment methods often inadequate for the effective removal of these antibiotics. This study introduces a novel approach leveraging the unique properties of deep eutectic solvents (DESs) impregnated graphene oxide (GO) for the enhanced removal of pharmaceutical compounds from aqueous solutions. Graphene oxide(GO), among various carbon-based adsorbents, has emerged as a preferred choice due to its extensive large surface area and superior adsorption capabilities impart an excellent scaffold for water purification applications[2]. However, its efficacy can be significantly enhanced when modified with DESs, which are known for their superior solvation properties and environmental sustainability [3]. This combination has not been extensively explored in the context of pharmaceutical compound removal. In this work, a series of DESs-impregnated GO materials synthesized using a straightforward impregnation method, which were characterized through Fourier-Transform Infrared Spectroscopy (FTIR), UV-Vis Spectroscopy, Total Organic Content (TOC), Scanning Electron Microscopy (SEM), and X- ray Diffraction (XRD). The performance of these materials was evaluated through batch adsorption experiments targeting pharmaceutical compounds especially antibiotics. Key parameters, such as contact time, pH, and adsorbent dosage, were optimized to achieve maximal removal efficiency. The pristine GO and DESs-impregnated GO demonstrated superior adsorption capabilities of 86.75 mg/g and 98.40 mg/g respectively for targeted antibiotic from aqueous solution. The adsorption kinetics and isotherms were analyzed, revealing that the adsorption process follows a pseudo-first-order kinetic model and fits the Langmuir isotherm, indicating monolayer adsorption on a homogeneously distributed surface.
The study showcases the potential of DESs-impregnated GO as a highly effective adsorbent for the removal of antibiotic from water. The findings suggest that this novel adsorbent could offer a sustainable and efficient solution for water purification, addressing the growing concern over pharmaceutical pollutants.
