Synthesis and characterization of a new inorganic material of fluor/hydroxyapatite CSH mixtures from blast furnace slag and their application in the removal of a cationic dye (methyleneblue) in aqueous solution
H. Agourrame , A.El Amri , H. Ez-zaki , N. Khachani , A. Diouri , A. Zarrouk
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Abstract
The study focuses on addressing wastewater contamination caused by increasing industrial activities by developing cost-effective, eco-friendly, and renewable materials. It investigates the use of white and black electric arc furnace slag (EAFS) from SONASID-Jorf steel in Morocco to prepare hydroxyapatite (HAP)/CSH and fluorapatite (FA)/CSH mixtures. These materials are evaluated for their adsorption properties using methylene blue (MB) as a model compound. The indicated phases were effectively formed by synthesizing activated slag with alkali activator utilizing a wet precipitation method. Characterization through X-ray diffraction (XRD), and scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy revealed the development of phases consisting of a combination of the hydroxyapatite (HAP)/CSH and fluorapatite (FA)/CSH phases. This study encompassed various factors such as initial contact time, dye concentrations, pH, sorbent doses, and the temperature of the initial dye solution. Adsorption isotherms, including Freundlich and Langmuir models, were utilized to describe the adsorption data. The maximum adsorption capacities for the different materials investigated were determined to be 114.15 mg/g and 147.05 mg/g at pH = 5. In all optimal conditions, the corresponding removal efficiencies for (HAP)/CSH and (FA)/CSH were found to be 85.94 % and 95.12 %, respectively. The adsorption kinetics of the mixtures was adapted to the pseudo-second-order model. The maximum experimental adsorption capacities predicted by the Langmuir model. The values of thermodynamic parameters revealed that the adsorption of the mixtures was exothermic, favorable, and spontaneous in nature. The results underscore the significant potential of mixtures as promising adsorbents for efficiently removing MB from aqueous solutions.
期刊介绍：
Launched in January 1998, Inorganic Chemistry Communications is an international journal dedicated to the rapid publication of short communications in the major areas of inorganic, organometallic and supramolecular chemistry. Topics include synthetic and reaction chemistry, kinetics and mechanisms of reactions, bioinorganic chemistry, photochemistry and the use of metal and organometallic compounds in stoichiometric and catalytic synthesis or organic compounds.
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