STUDY OF SORPTION PROPERTIES OF CARBON NANOTUBES

FOR WATER PURIFICATION FROM INORGANIC IMPURITIES

Irina V. Zaporotskova

Doctor of Sciences (Physics and Mathematics), Professor,

Director of the Institute of Priority Technologies

Volgograd State University

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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Tatyana A. Ermakova

Candidate of Sciences (Chemistry), Associate Professor,

Department of Forensic Examination and Physical Materials Science,

Volgograd State University

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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Olesya A. Kakorina

Candidate of Sciences (Physics and Mathematics),

Acting Head of Information Security Department

Volgograd State University

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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Vladimir V. Akatiev

Senior Lecturer, Department of Forensic Examination and Physical Materials Science,

Volgograd State University

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Prosp. Universitetsky, 100, 400062 Volgograd, Russian Federation

Lilia V. Kamyshanova

Senior Lecturer,

Volgograd Institute of Management, Branch of the Russian Presidential Academy

of National Economy and Public Administration

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Gagarina St, 8, 400066 Volgograd, Russian Federation

Abstract. Studies of adsorption properties of carbon nanotubes with respect to inorganic molecules have been 
carried out. Theoretical quantum-chemical calculations of the interaction of the most common impurity molecules 
in water with carbon nanotubes were made. Analysis of modern water purification filters shows the general 
disadvantage of all modern filters – they clean water only from a certain type of pollution. In order to clean water 
from a wide range of different pollutants, it is necessary to carry out multistage purification, with different types of 
filters, which is very resource intensive, and takes quite a long time. Using carbon nanomaterials as filters will 
solve this problem. For the study, the most common inorganic substances were chosen, which are most often 
found in drinking water: calcium chloride CaCl2, magnesium chloride MgCl2, sodium chloride NaCl, calcium 
carbonate CaCO3, magnesium carbonate MgCO3, calcium sulfate CaSO4, magnesium sulfate MgSO4. 
Processes of adsorption interaction of selected inorganic impurity molecules to the surface of single-layer carbon 
nanotubes of type (6,6) were investigated. Surface profiles of potential energy of interaction of molecules 
(calcium, magnesium and sodium salts) with surface of carbon nanotube are constructed. The positive effect of 
carbon nanostructures on the process of water purification from inorganic impurities is shown, meaning the 
possibility of using CNT as a filter for water purification.
Key words: sorption, carbon nanotubes, quantum-mechanical calculations, water purification, inorganic impurities, 
magnesium salts, calcium salts, sodium salts.

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