Photocatalytic Activity of Nanocomposites Based on Titania Nanorods and Nanotubes Doped with Ag and Reduced Graphene Oxide Nanoparticles

Timur Serikov, A.S. Kayumova, А.S. Baltabekov, L.F. Ilina, P.A. Zhanbirbayeva

2023

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DOI 10.1134/s2635167623700040
Data confidence 70 medium
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Abstract

Abstract Films formed by TiO2 nanotubes (TNT) and nanorods (TNR) and crystallized to the rutile phase have been synthesized. TNT and TNR with rutile phase were used to form nanocomposite materials with the addition of Ag and reduced graphene oxide (rGO) nanoparticles. It has been found that with the addition of Ag and rGO nanoparticles, the photocatalytic activity of nanocomposite materials increases due to the improvement of electron transport and the expansion of spectral sensitivity in the visible range, both for nanotubes and TiO2 nanorods. Films made of TiO2 nanorods and nanocomposite materials based on them demonstrate higher photocatalytic activity than films made of TiO2 nanotubes and composite materials based on it. Thus, at a lighting duration of 100 min in the presence of a TNR/Ag/rGO film, the degradation of Methylene blue was 81%, and for TNT/Ag/rGO—67%. In addition, the results of the assessment of photocatalytic activity by the photocurrent response showed that TNR/Ag/rGO generate an electric current 1.5 times higher than TNT/Ag/rGO. The low photocatalytic activity of TNT and composite materials based on them is associated with a smaller surface area of the nanocomposite, high resistance values and electron lifetime.