Abstract

Titanium dioxide (TiO2) nanoparticles were successfully attached to the outer surface of one dimensional oxidized multi-walled carbon nanotubes (MWCNTs) via sol-gel technique. It was well-established that calcination temperature played a critical role in controlling the crystallinity and phase of MWCNTs/TiO₂ composites. Thus, the effects of calcination temperature on the resulting MWCNTs/TiO₂ were illustrated. The phase transition of MWCNTs/TiO₂ composites was determined using XRD analysis. The photocatalytic activity evaluation of MWCNTs/TiO₂ composites was conducted under degradation of organic dye (methyl orange solution). The results revealed that annealed MWCNTs/TiO₂ composites showed significantly enhanced photocatalytic activity due to the highly crystalline anatase TiO₂ structures.

Keywords: Methyl orange, MWCNTs, Sol-gel, TiO₂.

Graphical Abstract