Abstract
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 m2/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.
Highlights
Water is an essential resource for man and his environment; for this reason, its contamination has become one of the challenges that the world must meet for its wellbeing [1,2,3]
Characterization of blast furnace (BF) slag The chemical composition of BF slag is reported in Table 1, where we find a dominance of the SiO2 (41.1%), CaO (37.2%), and Al2O3 (8.2%)
In this work, the nickel adsorption by BF slag from aqueous solution was investigated as a function of contact time, stirring speed, initial pH, temperature, particle size, and initial concentration in batch adsorption technique
Summary
Water is an essential resource for man and his environment; for this reason, its contamination has become one of the challenges that the world must meet for its wellbeing [1,2,3]. It is unavoidable to remove the metal ions from water environment by efficient and rigorous methods such as chemical precipitation [8], coagulation/flotation [9], membrane technologies [10], ion exchange [11], electrochemical technologies [12], and adsorption phenomenon [13,14,15,16].
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