Hydrothermal preparation of ZnO:CNT and TiO2:CNT composites and their photocatalytic applications

Photocatalytic Carbon‐Nanotube–TiO2 Composites

“…Although the most common method is the sol-gel route, [15,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] there are reports where the coating has been accomplished by the hydrothermal method. [20,26,27,32,34,35] One of the most published configurations has titania nanoparticles bounded to the surface of the CNTs. This is typically achieved by nucleating and growing titania on dispersed CNTs in a liquid medium.…”

“…[23,26,28,30,31] Recently, CNTs have also been coated via hydrothermal methods. [20,26,27,32,34,35] Hydrothermal processes use mostly titanium tetrachloride [27,31] and TiOSO 4 . [32] Regardless of the chosen conditions and chemistry, the final material is mostly amorphous TiO 2 with seeds of anatase.…”

“…The most common method of assessing the activity of a nanocomposite photocatalyst is by measuring the time dependence of the concentration loss of an organic compound under UV irradiation. This can be done with a dye [32,34,35,[40][41][42] or, alternatively, with potential pollutants, such as phenol. [15,21,35] Recently, there have also been reports of degrading toxic gases such NO x .…”

Carbon Nanotubes and Carbon Nanotubes/Metal Oxide Heterostructures: Synthesis, Characterization and Electrochemical Property

“…In this simplest case of hydrothermal synthesis, pristine or acid-treated CNTs were added to an aqueous solution of the precursor and treated in an autoclave at temperatures between 100 and 240 °C to produce crystalline films of ZnO [180], TiO 2 [181], or Fe 2 O 3 [182]. These works consistently produced dense coatings of spherical or slightly elongated nanoparticles.…”

Study on the synthesis of ZnO/K2SO4 composite material by sol–gel method and its photocatalytic properties

“…ZnO is a natural n-type semiconductor that is chemically stable and environmentally friendly. Several research papers related to removal of toxic and hazardous compounds (such as phenol and dyes) from water using ZnO as photocatalyst have been published during the last decade [2][3][4]. However, before the method can be used practically in the real world, the degradation efficiency still needs to be further improved by modifying ZnO photocatalysts using methods such as noble-metal deposition [5], ion doping [6], or coupled metal dioxide [7].…”