Kinetics and Equilibrium Study of Nickel(ii) Removal Using Peat Moss

Abstract

In this study, the removal of nickel(II) ions from aqueous solutions using peat moss sampled from Poiana Stampei (Romania) under different experimental conditions (different initial concentrations of metal ion and contact time) was investigated, in batch experiments. The kinetics of adsorption process was followed based on the amount of nickel(II) ions retained at various time intervals, and the experimental results were analyzed using three kinetic models: pseudo-first order, pseudo-second order and intra-particle diffusion models. The rate constants of adsorption process for all these kinetic models were calculated. Good correlation coefficients were obtained for the pseudo-second order kinetic model, showing that nickel(II) uptake process followed the pseudo-second order rate expression. Adsorption isotherms were expressed by Langmuir and Freundlich adsorption models. The Langmuir model fit the experimental data with high correlation coefficient and better than Freundlich model and the maximum adsorption capacity was obtained as 32.89 mg/g, at 65 °C. The effect of temperature on nickel(II) adsorption process was also investigated and various thermodynamic parameters (∆G, ∆H and ∆S) have been calculated.

Arsenic, antimony, and nickel leaching from northern peatlands treating mining influenced water in cold climate

“…Ni adsorption on peat moss has been shown to increase with temperature (Bulgariu et al, 2010) however no such effect was clear from the current experiments. The difference between findings may be due to a number of factors such as the solution chemistry (containing only Ni), concentrations used (exponentially higher than this study) and the treatment of peat (dried, grounded and sieved) used in the other study.…”

Contribution to Modelling the Effect of Temperature on Removal of Nickel Ions by Adsorption on Nano-Bentonite

“…Comparison of the highest capability of different sorbents for Ni(II): The removal power of nano-bentonite and other some sorbent materials for exclusion of Ni(II) presented in literature [26][27][28][29][30][31][32][33][34] are given in Table-5. It is noted that the sorption ability of nano-bentonite in the direction of Ni(II) is similar or even superior than another existing sorbents.…”

Novel chitosan-functionalized samarium-doped cobalt ferrite for adsorptive removal of anionic dye from aqueous solutions

“…The energy values (E S ), reported in Table 3, ranged from 9.85 to 11.78 (kJ/mol) depending on temperature. These values are included into the range of 8e16 kJ/mol suggesting that the ion exchange mechanism is predominant [33] for this adsorption system. The thermodynamic parameters for Orange II adsorption onto CoFe 1.98 Sm 0.02 O 4 @CS-ECH were calculated using the equations reported in Ref.…”