Carbon nanotubes (CNTs) are a promising class of nanomaterials that possess the capability to purify wastewater from synthetic dyes such as methylene blue (MB). The efficiency to retain redox active MB dye provides insights to the development of novel cylindrical carbon-based nanomaterial for water purification from dye contaminants. Noncovalent interactions of methylene blue cation (MB<sup>+</sup>) adsorbed onto the curvature surface of semiconducting single-walled carbon nanotubes (SWCNTs) is characterized by using vibrational sum-frequency generation (VSFG) spectroscopy. This SFG technique looks at the vibrations specific to the surface and provides vibrational spectra of molecules solely at the interface. The adsorption of MB dye on the unique curvature surface of SWCNTs in solution has not yet been characterized, which limits the further advancement of the fabricated nanocomposites. Information from spectral measurements may provide insight to characterize the interfacial organization of MB<sup>+</sup> ion adsorbed on SWCNTs in solution, and will attract further electrochemical studies and waste purification of cationic dyes.

Investigating adsorption of methylene blue on single-walled carbon nanotubes using vibrational sum-frequency generation

2019 Spring National Meeting

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