Abstract
In this work, hierarchical TiO2 nanolace (NL-TiO2) films have been synthesized by a two-step anodization technique. This was followed by a reduction in a hydrogen atmosphere to prepare the reduced black version of such hierarchical nanolaces (NL-TiO2-x). The FESEM images confirmed highly-ordered nanolace arrays structure for all the synthesized films. The Ti3+ ions/oxygen vacancies were confirmed using XPS spectra. The photoelectrochemical properties of NL-TiO2-x showed superior character in comparison with NL-TiO2 by the virtue of the promoted electron-hole separation efficiency, which induced by the Ti3+ ions/oxygen vacancies in NL-TiO2-x. The data showed that the NL-TiO2-x film annealed at 650 °C attained the maximum photoelectrochemical properties with a significant ABPE and IPCE of 0.58% and 52.51%, respectively. The applied photocatalytic reduction of Cr (VI) as an environmental contaminant to Cr (III) was effectively done using NL-TiO2-x and NL-TiO2 annealed at 650 °C with a photocatalytic reduction rate 48.15% and 27.5%, respectively.
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