Enhanced photoactivity of Sm, N, P-tridoped anatase-TiO2 nano-photocatalyst for 4-chlorophenol degradation under sunlight irradiation

Copper and nitrogen doping on TiO2 photoelectrodes and their functions in dye-sensitized solar cells

“…TiO 2 has been used as the primary photoelectrode for DSSCs, owing to its low cost and high flexibility, energy conversion efficiency, and physical stability. Therefore, to increase the energy conversion efficiency of DSSCs, some presumable methods have been reported for improving the properties of TiO 2 , such as chemically modified surface, combination with different semiconductors (ZnO, ZrO 2 , Nb 2 O 5 , In 2 O 3 , La 2 O 3 ) [2e4], metal doping (Ag, W, Zn, Cd, Ta, Zr) [2,3,13,14], and nitrogen doping [2,5,15,16].…”

“…These results enhance adsorption rates of dyes and smoothly transfer excited electrons, protecting recombination of electrons. Therefore, addition of nitrogen can produce high efficient DSSCs [2,15,16,46].…”

Visible Light Photocatalytic Degradation of Azo Dye and a Real Textile Wastewater Using Mn, Mo, La/TiO2 /AC Nanocomposite

“…Original scientific paper Received: October 25, 2017 Accepted: May 18, 2018 An important drawback of photocatalytic activities of TiO 2 is a wide band gap (3.2 eV for anatase) that requires UV light during the photocatalytic reaction, or, in other words, only a small fraction of solar energy, about 4-5 %, is adsorbed, which leads to inefficient photocatalytic reaction when using sunlight [24][25][26][27] . The problem of the high recombination rate of electron-hole pairs is charging the carriers separation, leading to their inability to be useful 28 .…”

“…Therefore, in recent years, many methods have been applied to improve the energy band gap and increase the light adsorption by TiO 2 . The modification approaches, such as reduction in particle size, increasing the surface area, doping and loading, all aimed to replace the adsorption of UV by visible light and increase the life-time of electron-hole pairs 25 . Previous studies have shown that doping with metals improved the photocatalytic efficiency of TiO 2 and could be considered as a promising strategy 29 .…”

Effective visible light-active nitrogen and samarium co-doped BiVO4 for the degradation of organic pollutants

“…This effect might be attributed to the N in the BiVO 4lattice because it induces an impurity level just above the valence band[23], thus decreasing the band gap to 2.14 eV. Furthermore, incorporating Sm species in the BiVO 4 introduces an impurity level below the conduction band[24], thus reducing the band gap energy to 2.21-2.14 eV and inducing high absorption in the visible light region. Furthermore, the band gap is 2.26 eV for 1.0Sm-BiVO 4 , which exceeds that of N-1.0Sm-BiVO 4 , thus confirming that nitrogen and samarium co-doping can result in a synergetic effect on the absorbance abilities of BiVO 4 .…”