Oxidation of multi-walled carbon nanotubes in acidic and basic Piranha mixture

Abstract

Multi-walled carbon nanotubes MWNTs were oxidized by using acid and base Piranha reagent. The acid reagent consists of mixture solution 3:1 H2 SO4 :H2O2 , while the base reagent was NH4OH:H2 O2 . We will discuss our results by using XRD diffraction to also study the effect of oxidizing agents on the surface by measuring the surface area. The ratios of carboxylic groups were discus by making back titration with 0.5 N HCl. The results show a shift in the main of XRD peaks in addition to increasing the agglomerates which causing reduces in the surface area. The effect of oxidizing agents was testing adsorption 40 ppm of Cobalamin which shows enhance with oxidized MWNTs as compare with pristine MWNTs. In addition to MWNTs which treated with acid piranha was more activity to adsorbed Cobalamin than base piranha.