Synthesis and photocatalytic application of ternary Cu–Zn–S nanoparticle-sensitized TiO2 nanotube arrays

A novel photocatalyst is prepared by pulse-electrodeposition of ternary Cu–Zn–S nanoparticles of 2.3 eV bandgap onto the surface of TiO2 nanotube array films. Under AM1.5G illumination the Cu–Zn–S sensitized TiO2 nanotube arrays (Cu–Zn–S/TiO2 NTAs) exhibit a significantly increased capability for photocatalytic degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) and anthracene-9-carboxylic acid (9-AnCOOH). After 150 min illumination 100% of 2,4-D is removed, compared to 51.8% using the non-sensitized TiO2 NTAs; while after 60 min illumination 100% of 9-AnCOOH is removed, compared to 68.5% using the non-sensitized TiO2 NTAs. Herein we consider synthesis details and application of the material system.

► An enhanced photocatalytic activity of Cu–Zn–S/TiO2 NTAs catalyst was fabricated by pulse electrodeposition method. ► The new catalyst was successfully applied in the photodegradation of 2,4-D and 9-AnCOOH under AM1.5G illumination. ► Photoelectrocatalytic process with excellent stability was established.