Adsorption of nickel(II) ions from aqueous solutions using Malatya clay: Equilibrium, kinetic, and thermodynamic studies

Abstract

This paper evaluates Malatya clay (MC) for the removal of Ni(II) ions from aqueous solutions. For adsorption efficiency, the impacts of several factors, such as pH, starting metal ion concentration, and contact duration, were examined. The optimal initial Ni(II) ion concentration was determined to be 5 mg/L, the adsorption contact duration was 360 min, and the solution's pH was 6.27. Using scanning electron microscopy, energy dispersive spectroscopy, and Fourier transform infrared spectroscopy, the surface characteristics of Malatya clay were examined. The isotherm data fit the Langmuir isotherm model, indicating chemical adsorption and likely irreversibility of the process, according to the results. At 298, 308, and 318 K, the adsorption capacities of Ni(II) were determined to be 10.267, 11.834, and 12.285 mg/g, respectively. Adsorption kinetic data revealed that the adsorption of Ni(II) metal ions followed the pseudo‐second‐order kinetic model. According to thermodynamic studies, Ni(II) ion adsorption on the MC is spontaneous and endothermic. MC has proven to be an effective and alternative material for the removal of Ni(II) ions from aqueous media due to its excellent removal ability, availability, and low cost, as well as its features such as being able to be used without any chemical treatment and being environmentally friendly.

Iodine and Nickel Ions Adsorption by Conjugated Copolymers Bearing Repeating Units of Dicyclopentapyrenyl and Various Thiophene Derivatives

“…On the other hand, conjugated copolymers TPP1 and TPP2 portray nickel ions' equilibrium adsorption capacities, q e (mg g −1 ), of 27 mg g −1 and 40 mg g −1 , respectively (Figure 9). g −1 ) for Ni 2+ from the aqueous solution, reaching up to 48.5 mg g −1 , which is promising, especially when compared with several values that have been reported in the literature [59][60][61][62][63]. On the other hand, conjugated copolymers TPP1 and TPP2 portray nickel ions' equilibrium adsorption capacities, qe (mg g −1 ), of 27 mg g −1 and 40 mg g −1 , respectively (Figure 9).…”

“…for Ni 2+ from the aqueous solution, reaching up to 48.5 mg g −1 , which is promising, especially when compared with several values that have been reported in the literature [59][60][61][62][63]. On the other hand, conjugated copolymers TPP1 and TPP2 portray nickel ions' equilibrium adsorption capacities, q e (mg g −1 ), of 27 mg g −1 and 40 mg g −1 , respectively (Figure 9).…”

Kinetic, Isothermal, and Thermodynamic Analyses of Adsorption of Humic Acid on Quaternized Porous Cellulose Beads

“…As shown in Figure 7, the activation energy decreased with an increase in the content of quaternary ammonium groups, and their values were much higher than 4.2 kJ/mol. If an adsorbate molecule is held on the adsorbent surface mainly by van der Waals type of interaction, the activation energy is usually no more than 4.2 kJ/mol [50][51][52]. Therefore, the results shown in Figure 7 indicate that HA adsorption on the quaternized cellulose beads is controlled by chemical reaction.…”

“…where A is a term that includes factors like the frequency of collisions (g/mol•s) and R is the universal gas constant (8.314 J/K•mol) [50][51][52]. Since a good linear relationship held between 1/T and ln k 2 , the activation energy was calculated from the slope.…”