2023

Marković, Miljan 
Gorgievski, Milan 
Štrbac, Nada 
Grekulović, Vesna 
Božinović, Kristina 
Zdravković, Milica 
Vuković, Milovan 

MDPI, Switzerland

Metals

13

2

206

English

M22 - Paper in a prominent international journal

The study on the biosorption of copper ions using raw eggshells as an adsorbent is presented in this paper. The influence of different process parameters, such as: initial pH value of the solution, initial Cu2+ ions concentration, initial mass of the adsorbent, and stirring rate, on the biosorption capacity was evaluated. The SEM-EDS analysis was performed before and after the biosorption process. SEM micrographs indicate a change in the morphology of the sample after the biosorption process. The obtained EDS spectra indicated that K, Ca, and Mg were possibly exchanged with Cu2+ ions during the biosorption process. The equilibrium analysis showed that the Langmuir isotherm model best describes the experimental data. Four kinetic models were used to analyze the experimental data, and the results revealed that the pseudo-first order kinetic model is the best fit for the analyzed data. Calculated thermodynamic data indicated that the biosorption process is spontaneous, and that copper ions are possibly bound to the surface of the eggshells by chemisorption. The biosorption process was optimized using Response Surface Methodology (RSM) based on the Box-Behnken Design (BBD), with the selected factors: adsorbent mass, initial metal ion concentration, and contact time.

biosorption, response surface methodology, Box-Behnken design, eggshell, equilibrium, kinetics, thermodynamics, copper ions

DOI

10.3390/met13020206

ISSN

2075-4701

URI

https://www.mdpi.com/2075-4701/13/2/206/htm
https://repozitorijum.tfbor.bg.ac.rs/handle/...