“…TiO 2 with various morphologies, such as nanorods, nanotubes, nanosheets, and nanowires, have been prepared and investigated as phocatalysts [9][10][11][12][13][14][15][16][17][18]. TiO 2 immobilized on substrates [19,20] as well as TiO 2 into thin film [13] have also been studied.…”
Abstract:Highly crystallized C-doped mesoporous anatase TiO 2 is prepared using a multi-walled carbon nanotube (MWCNT) mat as both a "rigid" pore template and a carbon doping source. SEM and TEM characterization shows that the MWCNT template imposed a pore structure in reverse of that of the MWCNT mat. The pore walls are formed by chain-like interconnected TiO 2 nanocrystals with an average diameter about 10 nm, and pores are derived from spaces occupied by MWCNTs before removal. XRD characterization shows that TiO 2 is crystallized with a pure anatase phase. XPS characterization reveals that the relative carbon content in the TiO 2 is related to the duration of TiO 2 /MWCNT composite annealing before removal of MWCNT template. Three plateau of adsorption from 450-800 nm in UV-Vis spectra in comparison to that of P25; and display visible light photocatalytic activity for decomposition of methyl orange (MO) in relationship with the carbon content and crystallinity of the anatase TiO 2 .
“…TiO 2 with various morphologies, such as nanorods, nanotubes, nanosheets, and nanowires, have been prepared and investigated as phocatalysts [9][10][11][12][13][14][15][16][17][18]. TiO 2 immobilized on substrates [19,20] as well as TiO 2 into thin film [13] have also been studied.…”
Abstract:Highly crystallized C-doped mesoporous anatase TiO 2 is prepared using a multi-walled carbon nanotube (MWCNT) mat as both a "rigid" pore template and a carbon doping source. SEM and TEM characterization shows that the MWCNT template imposed a pore structure in reverse of that of the MWCNT mat. The pore walls are formed by chain-like interconnected TiO 2 nanocrystals with an average diameter about 10 nm, and pores are derived from spaces occupied by MWCNTs before removal. XRD characterization shows that TiO 2 is crystallized with a pure anatase phase. XPS characterization reveals that the relative carbon content in the TiO 2 is related to the duration of TiO 2 /MWCNT composite annealing before removal of MWCNT template. Three plateau of adsorption from 450-800 nm in UV-Vis spectra in comparison to that of P25; and display visible light photocatalytic activity for decomposition of methyl orange (MO) in relationship with the carbon content and crystallinity of the anatase TiO 2 .
“…5,14,15 In addition to this, the TiO 2 photocatalyst has also been extensively studied with novel heterostructure functional materials, such as narrow band-gap semiconductors, metal and non-metal elements and dye molecules to increase the efficiency and range of photon absorption. [16][17][18] Carbon based materials, such as graphene oxide, graphene sheets and graphene quantum dots anchored with the TiO 2 photocatalyst are highlighted as cost-effective UV driven photocatalysts in the visible region with enhanced activity due to their retarded charge recombination, increased reaction sites and expanded light absorption range properties. 19,20 These nanostructures concentrate organics near the photocatalyst surface, which could facilitate the effective photodegradation of pollutants under UV light.…”
a Herein, a novel strategy has been proposed to fabricate graphene quantum dots (GQDs) infilled titanium dioxide (TiO 2 ) nanotube arrays (NTAs) hybrid structure for dye degradation of methylene blue (MB) under UV light (365 nm) irradiation. GQDs are infilled inside the TiO 2 NTAs (via anodic oxidation of a Ti sheet) through an impregnation method. Moreover, the morphology of the TiO 2 NTAs is well maintained after filling the GQDs inside, which is favorable for mass transfer. The peak intensity of photoluminescence (PL) spectra of the GQDs infilled TiO 2 NTAs catalyst is lower than that of annealed TiO 2 NTAs and a strong violet UV emission is obtained at 387 nm upon 252 nm deep UV excitation. The photocatalytic activities of the TiO 2 NTAs are evaluated in terms of the efficiencies of photo-decomposition and adsorption of MB in aqueous solution under UV light irradiation, after the impregnation of GQDs inside the TiO 2 NTAs. The highly-efficient photocatalytic activity is attributed to the broad absorption in the visible wavelength region, large photo-induced charge separation through the transfer of photogenerated electrons from the TiO 2 NTAs to GQDs, as well as the strong adsorption capacity of the GQDs to MB molecules. Thus, the GQDs infilled TiO 2 NTAs could be widely used as a photocatalyst for treating organic contaminants in the field of environmental protection.
“…However, the disadvantages of easy-to-lost based on the matrix limit its application. At present, the effective way to solve this problem is to load the NT on inorganic materials such as glass, cement and ceramic [7][8][9][10]. The cement-based materials have special porous structure characteristics, which can enhance the capacity of absorbing pollutants and then can improve the efficiency of photocatalysis [11].…”
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