Electronic properties and photodegradation ability of V–TiO2 for aniline. (April 2023)

• Record Type: Journal Article
• Authors: Gao, Chunhong; Liu, Jinjia; Jia, Meilin; Sa, Gala; Xu, Aiju
• Is Part Of: Dyes and pigments. Volume 212(2023)
• Publication Date: 2023-04
• Subjects: Hydrothermal method -- Photocatalytic mechanism -- Aniline -- DFT -- Photodegradation; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2023.111115
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Photocatalytic technology has broad prospects in the degradation of organic pollutants due to its green, energy-saving and high-efficiency characteristics. In this study, TiO2 and V–TiO2 were prepared by hydrothermal method, and the catalysts were tested by experimental and theoretical calculations under a 400 W metal halide lamp degradation efficiency for aniline (30 mg/L). The synthetic photocatalysts were characterized by XRD, HRTEM, FT-IR, XPS, UV–Vis DRS, PL, EIS, and photocurrent, the results showed that the edges of the V-doped TiO2 absorption band were redshifted, the band gap value were reduced, the photocatalytic activity were improved, and the PL showed e − /h + had the lowest composite rate for 1.5 mol%V–TiO2 and broadens the optical response range. 1.5 mol% V was the optimal value for photodegrading aniline, and moderate V modification can significantly inhibit the complexation of e − /h + pairs. Finally, stability measurements performed over 5 cycles show that 1.5 mol%V–TiO2 has excellent stability. The calculation results show that the optical band gap of V–TiO2 were significantly reduced, the photocatalytic performance of V–TiO2 were greatly enhanced. Highlights: Metal V-doped modulates the electronic structure of TiO2 and broadens the optical response range. An increase in V–TiO2 specific surface area can provide more active sites. The effect of V on the electronic properties of TiO2 was studied, and a DFT calculation was performed. Synergy between V–TiO2 and aniline to improve photodegradation efficiency. V-doped TiO2 catalysts exhibit impressive cyclic stability.