Evaluation of potato peel as a novel adsorbent for the removal of Cu(II) from aqueous solutions: equilibrium, kinetic, and thermodynamic studies

Abstract

A B S T R A C TIn this study, potato peel (PP) was evaluated for its ability to remove Cu(II) ions from synthetic aqueous solutions under various operating conditions in a batch process. The effect of experimental parameters such as adsorbent dose (0.25-1.5), initial pH (2-5), stirring speed (0-800 rpm), temperature (25-55˚C), ionic strength (0.25-5 g/400 mL), adsorbent particle size (0.16-1.5 mm), and initial Cu(II) concentrations (25-300 mg/L) on the removal of Cu(II) was investigated. The adsorption kinetics uptake for Cu(II) by PP at various initial metal ions concentrations was analyzed using the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. It was found that the pseudo-second-order kinetic equation was the best applicable model to describe the adsorption kinetic data. The experimental data were analyzed by four adsorption isotherms, namely the Langmuir, Freundlich, Temkin, and Elovich models. Equilibrium data fitted well both to the Langmuir and Freundlich models with a maximum adsorption capacity of 84.74 mg/g at 25˚C. Thermodynamic parameters of Cu(II) adsorption on PP have also been calculated. These results demonstrate that the PP is a suitable adsorbent for the removal of Cu(II) ions from aqueous solutions.

Adsorption of Cu onto Maize Husk Lignocellulose in Single and Binary Cu-Zn Solution Systems: Equilibrium, Isotherm, Kinetic, Thermodynamic and Mechanistic Studies

“…The ground maize husk was sieved to particle size of 30 mesh using American Society for Testing and Materials (ASTM) standard sieves. The powdered husk was then stored in a moisture free and air tight plastic container and used as adsorbent in all adsorption studies [2].…”

“…Aliquots from each flask were removed and the copper concentration in the solution determined using Agilent 240 AA atomic absorption spectrophotometer. This procedure was repeated with 50 mL of equimolar solution of Cu and Zn ions containing 10, 20, 30, 40 and 50 mg/L of each ion [2].…”

“…3 [15]. q e = (2) log q e = log K F + log C e (3) Where K F is a constant indicative of the relative adsorption capacity of the adsorben and the magnitude of n gives an indication of the favorability of the adsorption given as follows: n = 1 (linear); n < 1 (chemical process) and n > 1 (physical process) [21,22]. The linear plot of ln q e versus C e for Cu in the single and binary solution systems are shown in Fig.…”

“…Toxic heavy metals not only contaminate earth's waters, but also underground water in trace amounts [1]. The metals with significant toxicity to humans and the environment include: chromium (Cr), copper (Cu), lead (Pb), cadmium (Cd), mercury (Hg), zinc (Zn), manganese (Mn) and nickel (Ni) [2]. These heavy metals are reported as priority pollutants because they are not biodegradable and are highly persistent in the environment [3].…”

Removal of Cu(II) from aqueous solutions by using marble waste

“…Tropikal ağaç talaşı 32.05 [36] Yerfıstığı kabuğu 10.15 [37] Patates kabuğu 84.74 [38] Çay atıkları 8.64 [39] Elma Atıkları 10.81 [40] Eğrelti otu 11.73 [41] Portakal kabuğu 106.12 [42] Muz kabuğu 87.94 [42] Hindistan cevizi kabuğu 66.65 [42] Mermer atıkları 208.33 Bu çalışma…”