Enhanced photocatalytic degradation of dyes over graphene/Pd/TiO2 nanocomposites: TiO2 nanowires versus TiO2 nanoparticles

We report hydrothermal and photodeposition methods that embeds Pd nanoparticles and graphene sheets into TiO2 photocatalyst homogeneously without any functionalizing the surface or using a surfactant

Hamed Safajou; Hossein Khojasteh; Masoud Salavati-Niasari; Sobhan Mortazavi-Derazkola

2017

Scholarcy highlights

  • Increasing environmental pollutions caused by heavy metals, pesticides, organic wastes and dyes in rivers and seas have provided the serious motivation to starting fundamental and applied research related to the area of environmental protection
  • Because of small amount and weak intensity of graphene and palladium impurity, no diffraction peaks associates to carbon or palladium species have been observed. 3.2
  • The method that we developed has some advantages for synthesizing novel TiO2, graphene and palladium nanocomposites for using as photocatalysts
  • After that, palladium ions were exposed with UV irradiation, the ions reduced to metallic palladium and deposited on TiO2 surface efficiently
  • Palladium species acts as an electron acceptor by collecting the photo-induced electrons and graphene acts as high electrical conductive path for photo-generated electrons resulting to producing active sites for dye degradation and promoting dye decomposition
  • In contrast to Gr/Pd/TiO2-NPs, Gr/Pd/TiO2-NWs have much higher surface area with an enormous number of active sites leading to more efficient activity in degradation of rhodamine B
  • Results indicate that Gr/Pd/TiO2-NWs photocatalyst has great potential for recycling and stability over five separation cycles

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