Nanotechnology and nanomaterials

The influence of synthesis conditions on the structure, morphology and adsorption properties of multi-walled carbon nanotubes
Ivanenko I.M., Dontsova T.A., Voronova A.S. 
Department of Inorganic Substances, Water Purification and General Chemical Technology, National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”. Prosp. Peremohy, 37, Kyiv-03056, Ukraine. 
E-mail: irinaivanenko@hotmail.com.

Multi-walled carbon nanotubes (MWCNs) are becoming more common as effective sorbents, due to a number of distinctive features: high specific surface area, developed a system of cylindrical pores, selectivity to certain types of adsorptives, chemical stability, and mechanical strength. Moreover, in recent years there has been a decrease in the MWCNs cost. This fact, along with that carbon nanotubes have a higher capacity, can cause the replacement of active carbon by MWCNs in various sorption processes from liquid and gaseous media and as stationary phases in chromatography [1-2].
Carbon nanotubes are frame cylindrical nanostructures formed by folding a graphene grid into a seamless cylinder, in which the carbon atoms are arranged in hexagons. Multi-walled carbon nanotubes consist of a multitude of concentric cylinders held by Van der Waals forces. The structural and adsorption properties of carbon nanotubes substantially depend on the method and conditions of synthesis; therefore the establishment of this dependence is an important task, which allows predicting the possibility of using the obtained sample in a particular area [1-2].
The MWCNs were obtained by a CVD-method from acetylene at a temperature of 600, 700, 800 and 900°C onto a bimetallic Mo-Fe catalyst, and cleaned with different ways. The influence of a temperature and cleaning methods on the structure, morphology and adsorption properties of obtained multi-walled carbon nanotubes were studied.

1	Defu G., Meiying L., Hongye H., Junyu C., Jibo D. et all. Facile preparation of functionalized carbon nanotubes with tannins through mussel-inspired chemistry and their application in removal of methylene blue // J. Molec. Liq.-2018.-271.-P.-246-253.
2	Sadegh H., Shahryari-ghoshekandi R., Maazinejad B., Aii V., Tyagi I. et all. Enhanced removal of toxic Congo red dye using multi walled carbon nanotubes: Kinetic, equilibrium studies and its comparison with other adsorbents // J. Molec. Liq.-2015.-212.-P.-266-271.