280
Cr(VI) ions of 0.3 and 0.4 mg/l, while it took 120–150 min to reach the steady state
for the concentrations of 0.5 and 0.6 mg/l. The equilibrium of adsorption for the
system Cr(VI)-diatomite was analyzed using the following adsorption isotherms:
Langmuir, Freundlich, Langmuir-Freundlich, and Redlich-Peterson. Best results to
describe the equilibrium of the investigated system are obtained by simulation in
MATLAB/Curve Fitting Toolbox using Redlich-Peterson isotherm. To define the
kinetics of the studied system, the following models are applied for studying the
kinetics of adsorption system Cr(VI) ions-diatomite: model of reaction of pseudofirst and pseudo-second order and model of Elovic. According to the detailed analysis of the applied kinetic models, the best results in terms of describing the kinetics
of adsorption process are provided by models of pseudo-second order and Elovic
that indicate reversible reaction.
The used natural raw material clayey diatomite from North Macedonia represents a very efficient adsorbent for removal of Cr(VI) ions from aqueous solutions,
and, so far, it has not been used in the literature for this purpose which gives to this
work originality in scientific and applicative aspect.
References
Babel S, Opiso EM (2007) Removal of Cr from synthetic wastewater by sorption into volcanic ash
soil. Int J Environ Sci Technol 4:99–107
Bayat B (2002) Comparative study of adsorption properties of Turkish fly ashes. J Hazard Mater
95:275–290
Belousov PE, Krupskaya VV (2019) Bentonite clays of Russia and neighboring countries.
Georesursy 21:79–90
Belousov P, Semenkova A, Egorova T, Romanchuk A, Zakusin S, Dorzhieva O, Tyupina E,
Izosimova Y, Tolpeshta I, Chernov M, Krupskaya V (2019) Cesium sorption and desorption on
glauconite, bentonite, zeolite, and diatomite. Fortschr Mineral 9:625
Biswajit D, Naba KM, Palas R, Soumya C (2013) Equilibrium, kinetic and thermodynamic study
on chromium(VI) removal from aqueous solution using Pistia Stratiotes biomass. Chem Sci
Trans 2:85–104
Case Studies in Environmental Medicine: Chromium toxicity (2000) Agency for Toxic Substances
and Disease Registry, US Department of Health and Human Services, Division of Health
Education and Promotion, Atlanta
Cekova B, Pavlovski B, Spasev D, Reka A (2013) Structural examinations of natural raw materials pumice and trepel from Republic of Macedonia. Proceedings of the XV Balkan Mineral
Processing Congress, Sozopol, pp 73–75
Chakir A, Bessiere J, Kacemi KEL, Marouf B (2002) A comparative study of the removal of trivalent chromium from aqueous solutions by bentonite and expanded perlite. J Hazard Mater
95:29–46
Chatterjee SK, Bhattachacharjee I, Chandra G (2010) Biosorption of heavy metals from industrial
waste water by Geobacillus thermodenitrificans. J Hazard Mater 175:117–125
Chiron N, Guilet R, Deydier E (2003) Adsorption of Cu(II) and Pb(II) onto a grafted silica: isotherms and kinetic models. Water Res 37:3079–3086
Chukanov NV (2014) Infrared spectra of mineral species. Springer Science+Business Media.
Dordrecht, Netherlands
Cieslak-Golonka M (1995) Toxic and mutagenic effects of chromium (VI). A review. Polyhedron
15:3667–3689
H. Memedi et al.
Cr(VI) ions of 0.3 and 0.4 mg/l, while it took 120–150 min to reach the steady state
for the concentrations of 0.5 and 0.6 mg/l. The equilibrium of adsorption for the
system Cr(VI)-diatomite was analyzed using the following adsorption isotherms:
Langmuir, Freundlich, Langmuir-Freundlich, and Redlich-Peterson. Best results to
describe the equilibrium of the investigated system are obtained by simulation in
MATLAB/Curve Fitting Toolbox using Redlich-Peterson isotherm. To define the
kinetics of the studied system, the following models are applied for studying the
kinetics of adsorption system Cr(VI) ions-diatomite: model of reaction of pseudofirst and pseudo-second order and model of Elovic. According to the detailed analysis of the applied kinetic models, the best results in terms of describing the kinetics
of adsorption process are provided by models of pseudo-second order and Elovic
that indicate reversible reaction.
The used natural raw material clayey diatomite from North Macedonia represents a very efficient adsorbent for removal of Cr(VI) ions from aqueous solutions,
and, so far, it has not been used in the literature for this purpose which gives to this
work originality in scientific and applicative aspect.
References
Babel S, Opiso EM (2007) Removal of Cr from synthetic wastewater by sorption into volcanic ash
soil. Int J Environ Sci Technol 4:99–107
Bayat B (2002) Comparative study of adsorption properties of Turkish fly ashes. J Hazard Mater
95:275–290
Belousov PE, Krupskaya VV (2019) Bentonite clays of Russia and neighboring countries.
Georesursy 21:79–90
Belousov P, Semenkova A, Egorova T, Romanchuk A, Zakusin S, Dorzhieva O, Tyupina E,
Izosimova Y, Tolpeshta I, Chernov M, Krupskaya V (2019) Cesium sorption and desorption on
glauconite, bentonite, zeolite, and diatomite. Fortschr Mineral 9:625
Biswajit D, Naba KM, Palas R, Soumya C (2013) Equilibrium, kinetic and thermodynamic study
on chromium(VI) removal from aqueous solution using Pistia Stratiotes biomass. Chem Sci
Trans 2:85–104
Case Studies in Environmental Medicine: Chromium toxicity (2000) Agency for Toxic Substances
and Disease Registry, US Department of Health and Human Services, Division of Health
Education and Promotion, Atlanta
Cekova B, Pavlovski B, Spasev D, Reka A (2013) Structural examinations of natural raw materials pumice and trepel from Republic of Macedonia. Proceedings of the XV Balkan Mineral
Processing Congress, Sozopol, pp 73–75
Chakir A, Bessiere J, Kacemi KEL, Marouf B (2002) A comparative study of the removal of trivalent chromium from aqueous solutions by bentonite and expanded perlite. J Hazard Mater
95:29–46
Chatterjee SK, Bhattachacharjee I, Chandra G (2010) Biosorption of heavy metals from industrial
waste water by Geobacillus thermodenitrificans. J Hazard Mater 175:117–125
Chiron N, Guilet R, Deydier E (2003) Adsorption of Cu(II) and Pb(II) onto a grafted silica: isotherms and kinetic models. Water Res 37:3079–3086
Chukanov NV (2014) Infrared spectra of mineral species. Springer Science+Business Media.
Dordrecht, Netherlands
Cieslak-Golonka M (1995) Toxic and mutagenic effects of chromium (VI). A review. Polyhedron
15:3667–3689
H. Memedi et al.