Advanced oxidation (H₂O₂ and/or UV) of functionalized carbon nanotubes (CNT-OH and CNT-COOH) and its influence on the stabilization of CNTs in water and tannic acid solution.
The properties of carbon nanotubes (CNTs) functionalized with -OH and -COOH groups during simulated water treatment with H2O2 and/or UV were tested. There following properties of CNTs were investigated: specific surface area, elemental composition (CHN), dynamic light scattering, Raman spectroscopy, X-ray photoelectron spectroscopy and changes in the CNTs structure were observed using transmission electron microscopy. Treatment of CNTs with H2O2 and/or UV affected their properties. This effect, however, was different depending on the functionalization of CNTs and also on the factor used (UV and/or H2O2). H2O2 plays a key role as a factor modifying the surface of CNT-OHs, whereas the properties of CNT-COOHs were most affected by UV rays. A shortening of the nanotubes, exfoliation, the opening of their ends, and changes in the surface charge were observed as a result of the action of UV and/or H2O2. The changes in observed parameters may influence the stability of the aqueous suspensions of CNTs.
Department of Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska Square 3, 20-031 Lublin, Poland. Electronic address: bczech@hektor.umcs.lublin.pl.
Bożena
B
Czech
Department of Environmental Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska Square 3, 20-031 Lublin, Poland.
Patryk
P
Oleszczuk
Department of Interfacial Phenomena, Faculty of Chemistry, Maria Curie-Skłodowska Square 3, 20-031 Lublin, Poland.
Agnieszka
A
Wiącek
D006861:Hydrogen Peroxide / Q000737:chemistry; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010084:Oxidation-Reduction; D012996:Solutions; D013059:Spectrum Analysis, Raman; D013535:Suspensions; D013634:Tannins / Q000737:chemistry*; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D037742:Nanotubes, Carbon; D012996:Solutions; D013535:Suspensions; D013634:Tannins; D014867:Water; D006861:Hydrogen Peroxide
CNTs; H(2)O(2); UV; Water treatment