ABSTRACT Novel bio-adsorbents based on abundant and invasive plants such as reeds represent an original and ecological route for the development of innovative biomaterials. Sustainable, eco-efficient, and facile processes have been suggested to improve the adsorptive performances and physicochemicalproperties of reedparticles. The morphological, textural, and physicochemical characteristics of the prepared reed-based adsorbents, namely untreated reed particles (RP), NaOH-treated RP (NaOH-RP), and sodium dodecyl sulphate impregnated RP (SDS-RP) were assessed by SEM, FTIR, XRD, BET, and TGA/DTG. The adsorptive performances of RP, NaOH-RP, and SDS-RP were evaluated for a triphenylmethane dye (Malachite Green, MG) elimination from water.The experimental results and kinetic models proved the improvement of MG uptake by modified reed-based adsorbents.The maximum MG uptake capacity of NaOH-RP and SDS-RP materials reached 82.64 and 102.88mgg−1, respectively, but it only attaineda value of 75.93mgg−1 for RPat the same conditions. The used reed-based adsorbents can regenerate four times with an MG removal capacity permanently superior to 80%. Besides, their experimental data obeyed the Freundlich equation and the pseudo2ndorder kinetic model, indicating the heterogeneous multilayer adsorption of MG onto reed-based materials. The adsorption/desorption, kinetic, isotherm, and thermodynamic studies, and physicochemical characterisations revealed that electrostatic interactions might be the governing mechanism of MG dye adsorption onto RP, NaOH-RP, and SDS-RP. Nonetheless, interactions such as H-bonding interactions, π-π stacking interactions, and hydrophobic interactions would also exist.
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