Abstract
Carbon-based nanomaterials with functionalized surface are widely used in water treatment, agriculture, hydrogen storage, and biology. The current study deals with characterization of engineered multi-wall carbon nanotubes (MWCNT) prior and after chemical modification in nitric acid for 1 and 2 h. It was shown that MWCNT surface area increased from 70 m2/g (pristine material) to 149 m2/g after 2 h modification, and the surface became hydrophilic. According to back-titration method the functional surface group concentration increased almost three times after 2 h treatment compared to 1 h modification. The results of thermogravimetric analysis (TGA) have shown good correspondence with functional COOH-group concentration of samples. Total pore volume and specific surface area were calculated using non-local density functional theory (NLDFT) and Brunaeur-Emmet-Teller (BET) models. Studied functionalized MWCNTs form stable water dispersions and show great potential for biological agricultural applications.
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Acknowledgements
This work was supported by the Federal Target Program “Investigations and developments along priority avenues for the advancement of science and technology of Russia in the 2014–2020 period” (grant agreement no. 14.575.21.0087 dated 21.10.2014, Project ID-RFMEFI57514X0087).
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Muratov, D.S., Stolyarov, R.A. & Gromov, S.V. Surface Structure and Adsorption Characteristics of COOH-Functionalized Multi-Wall Carbon Nanotubes. BioNanoSci. 8, 668–674 (2018). https://doi.org/10.1007/s12668-017-0442-y
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DOI: https://doi.org/10.1007/s12668-017-0442-y