Controllable fabrication of immobilized ternary CdS/Pt–TiO₂ heteronanostructures toward high-performance visible-light driven photocatalysis

Abstract

Immobilized TiO2 nanotube arrays (NTAs) co-modified with Pt and CdS nanoparticles were fabricated by using the combination of photoreduction and chemical bath deposition methods. XRD, SEM, TEM, XPS, UV-Vis and EDX methods were employed to characterize the microstructure and composition of samples, and the results showed that CdS and Pt NPs were uniformly deposited on the surface of TiO2 nanotubes. The CdS/Pt/TiO2 NTAs exhibited a much higher photocatalytic activity compared to pure TiO2 NTAs and binary CdS (or Pt)/TiO2 NTAs under visible light irradiation. A kinetic study showed that the rate constants of Pt/TiO2, CdS/TiO2 and CdS/Pt/TiO2 NTAs are 0.00736, 0.01717 and 0.02077 min(-1), respectively, revealing a remarkable kinetic enhancement in the ternary heteronanostructures due to the synergistic effect of the three components. Besides, the CdS/Pt/TiO2 NTAs exhibit high stability after being used 22 times. Thus we proposed that such ternary heteronanostructures show great promise as immobilized catalysts for high efficient visible-light-driven photocatalysis.

Recent Advances and Applications of Semiconductor Photocatalytic Technology

“…In multicomponent modified TiO 2 , as compared to one-component modified TiO 2 , different components can be combined with one another such that the catalyst has different degrees of improvement in light absorption performance and electron-hole separation efficiency. Gao et al [273] used photoreduction deposition and chemical bath deposition to prepare Pt and CdS nanoparticles on co-modified TiO 2 nanotubes. The decomposition rate of methyl orange dye with Pt and CdS co-modified TiO 2 nanotubes reached 91.9% under visible light.…”

Facile strategy for the fabrication of noble metal/ZnS composites with enhanced photocatalytic activities

“…It has been found that there are many methods for fabricating noble metal/sulde composites, such as the microwave assisted reduction method, the photoreduction coupled water bath method, and the in situ deposition method. [21][22][23][24][25][26] However, the above mentioned methods have some disadvantages, such as a complicated operation, high cost, and can be difficult to control. Therefore, it is highly desirable to nd a simple and fast technique to obtain noble metal/sulde composites.…”

Photocatalytic Behaviors of TiO2 Nanoblets Coated with MoS2 Nanosheets for Solar‐Driven Photocatalysis

“…Since the pioneering work of Fujishima and Honda in 1972, using TiO 2 as a photocatalyst became widely concerned . However, there were two key barriers to restrict the wide application of TiO 2 photocatalyst . On the one hand, TiO 2 is a wide‐band‐gap semiconductor with a wide bandgap of ∼3.2 eV, which limits the absorption of visible light.…”

“…However, there were two key barriers to restrict the wide application of TiO 2 photocatalyst . On the one hand, TiO 2 is a wide‐band‐gap semiconductor with a wide bandgap of ∼3.2 eV, which limits the absorption of visible light. On the other hand, the recombination rate of photogenerated electrons and holes in TiO 2 was rather high to lead to seriously lowered photocatalytic performance .…”

“…On the one hand, TiO 2 is a wide‐band‐gap semiconductor with a wide bandgap of ∼3.2 eV, which limits the absorption of visible light. On the other hand, the recombination rate of photogenerated electrons and holes in TiO 2 was rather high to lead to seriously lowered photocatalytic performance . In order to improve photocatalytic performance of TiO 2 , many methods have been tried, such as ion‐doping, modification with noble metal, and semiconductor materials composition etc .…”