Kinetic studies of Ni(II) ions adsorption from aqueous solutions using the blast furnace slag (BF slag)

• Published in: Journal of engineering and applied science (Online) Vol. 68; no. 1; pp. 1 - 18
• Main Authors: Chouchane, Toufik, Khireddine, Ouahida, Boukari, Atmen
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.12.2021; Springer Nature B.V; SpringerOpen
• Subjects: Adsorbents; Adsorption; Agitation; Aqueous solutions; Blast furnace chemistry; Blast furnace slags; Efficiency; Engineering; Equilibrium; Kinetics; Metals; Nickel; Particle diffusion; Slag; Water; Work stations; Algeria; Water; Slag; Nickel; Kinetics; Adsorption
• ISSN: 1110-1903; 2536-9512
• DOI: 10.1186/s44147-021-00039-3

In this work, we used the blast furnace slag for the nickel adsorption in aqueous solution. The physico-chemical characterization showed that the BF slag consists mainly of the silica, lime, and alumina. The specific surface area of the BF slag grains is of the order of 275.8 m 2 /g. The optimum elimination parameters are the agitation speed 200 rpm, pH 4.5, the adsorption temperature 20 °C, and particle size between 200 and 500 μm. The adsorption capacity and the efficiency of nickel removal by the BF slag after 90 min of agitation are respectively 53.58 mg/g and 92.7%. The experimental adsorption data showed that the pseudo-second-order model was the most appropriate in nickel adsorption kinetics; the adsorption isotherm could be described well by the Langmuir model indicating that the process was monolayer, and intra-particle diffusion is not the sole mechanism involved in this process. Thermodynamic study showed that the Ni(II) elimination by BF slag process is spontaneous, exothermic, and less entropic.