Novel green synthesis of a Ni–Fe LDH/date seeds nanocomposite for the removal of ciprofloxacin and levofloxacin from aqueous solutions

Le résumé fourni par la source

The proliferation of antibiotics such as ciprofloxacin (CIP) and levofloxacin (LEV) in aquatic ecosystems poses serious ecological and health risks. Therefore, developing sustainable and low-cost adsorbents for their removal is of great environmental importance. This study presents a novel Ni‒Fe layered double hydroxide/date seed nanocomposite (Ni‒Fe LDH/DS) synthesized by combining date seed waste with Ni‒Fe LDH to improve the adsorption capacity and achieve desalination. A novel green synthesis route was developed to prepare a Ni–Fe LDH/date seed nanocomposite capable of simultaneously removing CIP and LEV. Characterization via XRD, FTIR, and FESEM/EDS confirmed their layered structure, functional groups (-OH, -COO⁻), and homogeneous surface morphology. Batch experiments revealed optimal CIP and LEV removal at pH 7, with efficiencies of 99.98% and 96.23%, respectively. The process adhered to the Langmuir model and pseudo-first-order kinetics, with maximum capacities of 601.20 mg/g and 506.40 mg/g for CIP and LEV, respectively. Thermodynamic analysis confirmed exothermic, spontaneous adsorption. The nanocomposite demonstrated exceptional desalination performance, removing up to 99.8% of the ions, and maintained over 80% efficiency after five regeneration cycles. The estimated cost of the nanocomposite was approximately $3.31 per gram. Cytotoxicity tests revealed that the nanocomposite (CC50 = 427.56±10.42 µg/ml) had better biocompatibility than did pristine Ni-Fe LDH (CC50 = 377.44 µg/ml), confirming its safety for environmental applications. Greenness and whiteness assessments via the MoGAPI and RGB12 strategies highlighted the method’s sustainability. This work highlights an eco-friendly and cost-effective solution for removing antibiotics from wastewater.

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