Enhanced visible light photocatalytic activity of TiO2 nanotube arrays modified with CdSe nanoparticles by electrodeposition method

Controlled deposition and enhanced visible light photocatalytic performance of Pt-modified TiO2 nanotube arrays

“…7, we can see that without Pt modification, TiO 2 NTAs showed almost no visible light response. The visible light photodegradation rate of TiO 2 NTAs was only 2.0% after irradiated for 2 h, which was due to the absorption of MO on TiO 2 NTAs [29]. After Pt modification, photodegradation rate of all the samples increased sharply with time increasing.…”

Capability of coupled CdSe/TiO2 heterogeneous structure for photocatalytic degradation and photoconductivity

“…The coupling of the semiconductors has a beneficial role in improving charge separation [ 22 ]. The excited electrons can transfer quickly from the CdSe conductive band to TiO 2 conductive band, and holes accumulate in the valence band of CdSe, because conductive band (CB) of CdSe is more negative than that of TiO 2 , which prevent electron-hole recombination [ 23 , 24 ].…”

A research on the visible light photocatalytic activity and kinetics of CdS/CdSe co-modified TiO 2 nanotube arrays

“…No obvious morphological change of samples can be observed after reused for 5, 10 and 15 times, indicating the good binding among CdS, CdSe NPs and TiO 2 nanotubes and excellent photocatalytic stability of CdSe/CdS/TiO 2 NTAs. Moreover, compared with CdSe/TiO 2 or CdS/TiO 2 NTAs, CdSe/CdS/TiO 2 NTAs show longer service life [21,22].…”

“…However, the relatively wide band gap of TiO 2 (3.2 eV for Anatase) limits the absorption band in the UV range (wavelength ≤ 380 nm). In order to improve the photocatalytic efficiency under visible light, different methods have been employed including coupling with noble metal deposition (Pt [16], Au [17]), non-metallic ion-doping (N [18,19], S [20]) and low band gap semiconductors (CdS [21], CdSe [22], PbS [23]). In these methods, coupling TiO 2 NTAs with low band gap semiconductor nanoparticles is known as a good choice.…”

“…Chang-Sung Lim and co-workers studied the photodegradation of CdSe/TiO 2 photocatalyst which was prepared by a facile solvothermal method, photocatalytic degradation of methylene blue (MB) solution was 42% under visible light [28]. In our previous work, CdS NPs were deposited onto TiO 2 NTAs using a CBD method and a photodegradation rate of 96.7% was achieved after 3 h visible light irradiation [22], CdSe NPs were deposited onto TiO 2 NTAs using a potentiostatic method in a typical threeelectrode cell and a photodegradation rate of 94.0% was achieved after 2 h visible light irradiation [21].…”