An Overview: Recent Development of Titanium Oxide Nanotubes as Photocatalyst for Dye Degradation

Table 5

Summary of the works reported on the different anionic-doped TiO₂ photocatalysts.

Anionic	Authors	Findings	Reference
N	Dong et al. (2009)	N-doped TiO2 nanotubes exhibit enhanced photocatalytic degradation of methyl orange under visible light irradiation by narrowing the band gap energy	[132]
N and C	Liu et al. (2009)	The C–N doping shifts the absorption edge of TiO2 nanotubes to the visible light regions and promotes the charge carrier transfer from the TiO2 surface to the electrolyte. The C–N doped TiO2 higher photocatalytic activity in the degradation of methyl orange than the undoped TiO2 nanotubes	[133]
N	Lai et al. (2010)	The N-doped titanium dioxide nanotubes exhibited higher photocatalytic activity in degrading methyl orange under UV and simulated sunlight irradiation	[134]
N	Peng et al. (2010)	N-doped titanate nanotubes completely degraded methyl orange within 240 minutes under 15 W fluorescent lamps	[135]
N and Zr	Liu et al. (2010)	N/Zr-codoped TiO2 nanotubes significantly improved the photocatalytic efficiency of TiO2 nanotube arrays under both UV and visible light irradiation	[136]
N	Z. He and H. Y. He (2011)	The N-doped TiO2 nanotubes with 25.7 at.% nitrogen content were capable of degrading methyl orange under visible and sunlight irradiation	[137]
N and C	Wang et al. (2011)	The photocatalytic activity of the codoped TiO2 nanotubes with C and N shows a superior photocatalytic activity in degradation of Rhodamine B under visible light irradiation	[102]
N	Wang et al. (2012)	N-doped TiO2 nanotubes associated with iron oxide photocatalyst successfully decomposed methyl orange in air under visible light irradiation	[138]
N	Lv et al. (2012)	N-doped TiO2 nanotubes showed further enhancement in photodegradation activity of methylene blue in the visible region.	[139]
N and F	Lee at al. (2012)	F–N-codoped TiO2 nanotubes effectively photodegraded the aniline blue dye within 200 min under visible light irradiation	[140]
F and S	Liao et al. (2012)	The binary F- and S-doped TiO2 nanotubes were capable of degrading methyl orange using xenon lamp to simulate natural sunlight	[141]
N	Dang et al. (2012)	N-doped TiO2 nanotube array films effectively degraded 81% of methyl orange in 150 min under visible light irradiation	[142]
N and S	Wang et al. (2013)	Thiourea-doped TiO2 nanotubes composed of N and S successfully decomposed 81.5% of methyl orange under visible light illumination within 90 min	[143]
N	Yuan et al. (2013)	The N-doped TiO2 exhibited higher photocatalytic degradation of methyl orange as compared to undoped TiO2 under UV and visible light irradiation	[144]