Facile fabrication of Ni-Fe-layered double hydroxide for boosted adsorption of Alizarin Red S dye in water

Articles in Press

Document Type : Research Article

Authors

1 Processes, Energetic, Environment and Electric Systems (PEESE), National School of Engineers, Gabes University, Gabes 6072, Tunisia

2 Department of Chemical Engineering, Universitat Rovira i Virgili, 43007, Tarragona, Spain

10.30492/ijcce.2024.2015602.6311

Abstract

This work aims to design layered double hydroxide (Ni-Fe-CO3) via simple co-precipitation route for the elimination of Alizarin Red S (ARS) dye from water. The physicochemical properties of Ni-Fe-CO3 adsorbent were studied using different spectroscopic and analytical techniques. The adsorptive ability of Ni-Fe-CO3 was evaluated for the removal of ARS under different conditions in order to understand the mechanistic pathways. Ni-Fe-CO3 showed high adsorption capacity up to 454.45 mg/g within just 1 h. It was found that the raise in the medium temperature from 20°C to 40°C boosts the adsorption ability, while above this value, there was no change in the adsorption capacity. The capacity of adsorption was found to be 157.97 to 55.38 mg/g at pH 2 to 9, respectively. The surface chemistry of the adsorbent and the dye charge in solution are significantly responsible for the pH dependency of dye adsorption. The analysis of adsorption data utilized different isotherm models shows that Freundlich isotherm is the most pertinent to the adsorption process. In accordance with the kinetic studies, the pseudo-second-order kinetic model, which also takes into account intra-particle diffusion in the adsorption process, may adequately describe the behavior of adsorption. The thermodynamic characteristics, such as ΔH°, ΔS°, and ΔG°, were found to be endothermic, spontaneous, and practicable. Even through the synthesis process is simple via the use of low-cost elements, the adsorption ability was comparatively high compared to the previous reported materials. Bridging between the lost cost of the process and high effectiveness is the best way to transfer the use of emerging materials to real world use.

Keywords

Iranian Journal of Chemistry and Chemical Engineering

Articles in Press, Accepted Manuscript
Available Online from 08 April 2024

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