ANALYSIS OF CR(III) IONS ADSORPTION ON THE SURFACE OF ALGAE: IMPLICATIONS FOR THE REMOVAL OF HEAVY METAL IONS FROM WATER

Tattibayeva Z. Tazhibayeva S. Kujawski W. Zayadan B. Мusabekov K. Adilbekova A.
2021 Technology Center

Eastern-European Journal of Enterprise Technologies
2021 #4 Issue 10-112 14 - 23 pp.

For purposeful control of the adsorption process, a comprehensive study of the properties of the original cells and the effect of metal ions on them is necessary. In this regard, the features of the adsorption of Cr(III) ions on the cell surface of Spirulina platensis algae were studied. FTIR spectroscopy revealed that the main functional groups responsible for the binding of Cr(III) ions are carboxyl, hydroxyl, amino, and phosphate groups on the surface of algae. The adsorption data were processed using the Langmuir and Freundlich models. It is shown that the maximum adsorption of Cr(III) ions on the surface of algae cells is 31.25 mg/g. The Freundlich constant 1/n is 0.65. The study of the effect of the concentration of Cr(III) ions on the Zeta-potential of algae cells revealed an abnormal increase in the ne ga-tive value of the (Formula presented) - potential at 10^-5 mol/L, caused by the release of an additional amount of anionic functional groups to the surface. A further increase in the concentration of Cr(III) ions in the algae suspension leads to a decrease in the Z - potential and recharge of the surface at C>10^-2 mol/L. It was found that the adsorption of Cr(III) ions also affects the morphology of the cell surface. If before contact with Cr(III) ions, the surface of algae cells is represented as a uniform green grid, after adsorption of Cr(III) ions, the surface becomes green-brown, with swollen spirals. The study of the effect of pH on the adsorption and desorption processes shows an increase in the desorption of Cr(III) ions from the surface of algae during acidification of the medium. The adsorption reaches a maximum value in the pH range of 6-7. In the region of optimal Cr(III)/biosorbent ion ratios, the recovery rate of Cr(III) reaches 98.5-99.3 %

adsorption , algae , Cr(III) ions , removal degree , Spirulina platensis , Zeta-potential

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Postgraduate Student, Department of Analytical, Colloid Chemistry and Technology of Rare Elements, Al-Farabi Kazakh National University, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan
Doctor of Chemical Sciences, Professor, Department of Analytical, Colloid Chemistry and Technology of Rare Elements, Al-Farabi Kazakh National University, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan
Doctor of Chemical Sciences, PhD Professor, Department of Physical Chemistry and Physical, Chemistry of Polymers Nicolaus Copernicus, University in Torun, Gagarina str. 11, Torun, Poland, 87—100
Doctor of Biological Sciences, Professor Department of Biotechnology, Al-Farabi Kazakh National University, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan
Associate Professor, Department of Analytical, Colloid Chemistry and Technology of Rare Elements, Al-Farabi Kazakh National University, Al-Farabi ave. 71, Almaty, 050040, Kazakhstan

Postgraduate Student
Doctor of Chemical Sciences
Doctor of Chemical Sciences
Doctor of Biological Sciences
Associate Professor

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