Synthesis and characterization of La2O3/TiO2−xFx and the visible light photocatalytic oxidation of 4-chlorophenol

Visible-light-driven composite La2O3/TiO2 nanotube arrays: Synthesis and improved photocatalytic activity

“…Obviously, the 2-La 2 O 3 /TNTs presents the highest photocurrent of 4.9 mA/cm 2 , almost 3.3 times as high as that of pure TNTs (1.5 mA/cm 2 ). The enhanced photocurrents over La 2 O 3 /TNTs samples imply that loaded La 2 O 3 can facilitate separation of photoinduced electron-hole pairs under visible light [23,29,40]. The more efficient separation of the photogenerated charge carriers is beneficial for its enhanced photocatalytic activity.…”

“…For the La 2 O 3 /TNTs system, La 3 þ doping will form Ti-O-La bonds at the interface and produce a charge imbalance [22,28]. The charge imbalance may provoke the reduction of Ti 4 þ to Ti 3 þ [29][30][31][32]. While a small amount of Ti 3 þ species could improve the optical absorption of TNTs in the visible-light region [16].…”

Silver Orthophosphate Immobilized on Flaky Layered Double Hydroxides as the Visible-Light-Driven Photocatalysts

“…Therefore, a growing interest is also focused on the development of the new photocatalysts that can operate effectively under visible light irradiation. The doping of TiO 2 with foreign elements such as metals and nonmetals to improve the energy band structure of TiO 2 has been extensively investigated [8], and nitrogen doping TiO 2 has been demonstrated as a visible light photocatalyst [9]. However, the absorption edge of N-doped TiO 2 was just extended to the wavelength below 450 nm with a lower absorption constant.…”

Highly efficient visible light TiO2 photocatalyst prepared by sol–gel method at temperatures lower than 300°C

“…Consequently, much attention has been paid to investigations on TiO 2 nanoparticles. However, the major drawback of TiO 2 nanoparticles lies in their ineffective use of visible light as irradiation source because the band gap of anatase TiO 2 (3.2 eV) is so wide that it can only absorb and be excited by UV light with wavelength less than 387 nm, which only occupies about 4-6% of the global solar radiation [4][5][6]. To resolve the above problem, many efforts have been exerted to extend the light absorption of TiO 2 into the visible light region, such as dye sensitization [7][8][9][10], transition metals ion doping [11][12][13][14], non-metals ion doping [15][16][17][18][19][20][21], ion implantation [22], metal deposition [23][24][25][26], semiconductor composite [27][28][29][30] and conjugated polymer modification [31][32][33][34].…”