2017/06/28 by Hamdije Memedi, Katerina Atkovska, Kiril Lisichkov +4 · 1 citation
Environmental Science · Chemistry · #Adsorption and biosorption for pollutant removal #Water Quality Monitoring and Analysis #Adsorption, diffusion, and thermodynamic properties of materials #Freundlich equation #Hexavalent chromium #Adsorption #Langmuir #Bentonite #Aqueous solution #Chromium #Thermogravimetric analysis #Chemistry #Fourier transform infrared spectroscopy #Nuclear chemistry #Chemical engineering #Physical chemistry #Organic chemistry
paper · pdf · doi:10.7251/qol1701041m
openalex publication_date 2017/06/28 · openalex created_date 2025/10/10 · openalex updated_date 2026/06/11
Removing hexavalent chromium from contaminated wastewater is very important because of toxicity to living organisms. Chromium is carcinogenic and mutagenic in very low concentration values (sub-ppm). The ability of the natural mineral (bentonite) for adsorption of hexavalent chromium, Cr(VI), from aqueous solutions was investigated. The influence of different physical and physicochemical parameters (pH, amount of adsorbent, adsorbate initial concentration) was examined. For characterization of adsorbent, classical chemical analysis thermogravimetric analysis (DTA/TGA), XRD analysis, FTIR-analysis and determination of specific surface area by BET were performed. For quantitative monitoring of the dynamics of studied system for the presence of Cr(VI) ions in model solutions, the AAS and UV/Vis analysis were used. The obtained experimental results were used for modeling of the equilibrium of the process through the application of software package MATLAB/Curve Fitting Toolbox., Following adsorption isotherms: Langmuir, Freundlich, Langmuir-Freundlich and Redlich-Peterson, are applied for analyzing the equilibrium of adsorbtion system Cr(VI) ions – bentonite.