Hydrothermal Synthesis and Characterization of Cu2+/F- Co-Doped Titanium Dioxide (TiO2) Nanotubes as Photocatalyst for Methyl Orange Degradation

作者：Razali Mohd Hasmizam^*; Noor Ahmad Fauzi Mohd; Yusoff Mahani

来源：Science of Advanced Materials, 2017, 9(6): 1032-1041.

DOI：10.1166/sam.2017.3071

• Hydrothermal
• TiO2 Nanotubes
• Photocatalyst
• Methyl Orange
• Degradation

Cu2+/F- co-doped titanium dioxide (TiO2) nanotubes were synthesized using simple hydrothermal method. The hydrothermal was carried out at 150 degrees C for 24 hours using commercial TiO2 powder (MERCK) as TiO2 nanotubes precursor and Cu(NO3)(2) and NH4F as Cu2+ dopant and F- co-dopant respectively in 100 ml NaOH (10 M). The co-doped TiO2 nanotubes photocatalyst were characterized by X-ray diffraction (XRD), nitrogen gas adsorption, transmission electron microscopy (TEM) and Energy Dispersive Spectroscopy (EDS). XRD analysis reveals a new TiO2 hexagonal phase was obtained after Cu2+ and F- co-doping. Pure TiO2 nanotubes is anatase TiO2 (tetragonal) phase. TEM results show that the samples possessed hollow tubular morphology with the outer diameter within 8-10 nm and several hundred nanometer in length. The surface area of Cu2+/Fco- doped TiO2 nanotubes was found to be higher than undoped and single metal ion (Cu2+) doped TiO2 nanotubes. However all studied nanotube samples show large surface area (>= 200 m(2)/g) attributed to their hollow tubular structure. XPS study suggests the co-doping of TiO2 with Cu2+ and F- initiated the formation of Ti3+ besides the existences Ti4+, which assisted the photodegradation of MO. Cu2+ doping was incorporated into interstitial positions of TiO2 lattice, while F- co-doping highly dispersed into TiO2 by replacing and occupied the oxygen site in the TiO2 crystal lattice to form solid solution of TiO2-xFx.

• 出版日期2017-6