Construction of BiOI/TiO2 flexible and hierarchical S-scheme heterojunction nanofibers membranes for visible-light-driven photocatalytic pollutants degradation

Visible-Light-Active BiOI/TiO2 Heterojunction Photocatalysts for Remediation of Crude Oil-Contaminated Water

“…This is because the flat-band potential of the photocatalysts in the electrolyte solution is almost the same as the Fermi level of the photocatalysts. 60,61 Figure 7A,B shows the FEGSEM images of the as-prepared TiO 2 and 4 × BiOI/TiO 2 photocatalysts. From the FESEM images, typical features of the TiO 2 films revealed a spherical morphology of the coated nanoparticles.…”

Bismuth Oxyhalide-Based Materials (BiOX: X = Cl, Br, I) and Their Application in Photoelectrocatalytic Degradation of Organic Pollutants in Water: A Review

“…Herein, two semiconductors—one dedicated to oxidation reactions (more positive valence band) and one reduction semiconductor (more negative conduction band)—come together and generate an interface with a strong redox potential; this is because, the photoexcited electrons are kept in the conduction band of the reduction photocatalyst and the holes are kept in the valence band of the oxidation photocatalyst ( Xu et al, 2020 ). In addition, a spontaneous diffusion of the remaining electrons and holes from the reducing semiconductor to the oxidizing semiconductor and vice versa occurs, causing the bands to bend in the interface to maintain Fermi level equilibrium ( Liao et al, 2021 ). Related studies have examined the S-scheme heterojunction of the ternary composite Bi 7 O 9 I 3 /g-C 3 N 4 /Bi 3 O 4 Cl synthesized via the oil bath method ( Yuan et al, 2022 ).…”

“…BiOI is a p-type semiconductor, with an even narrower bandgap energy than BiOCl and BiOBr (approximately 1.70 eV), and thus, has been considered one of the most promising materials for environmental remediation in both photocatalytic and photoelectrocatalytic systems ( Zhang et al, 2008 ; Hu et al, 2014 ; Huang et al, 2017 ). Recently, numerous studies have focused on the design of new BiOI-based materials to treat different pollutants through photocatalytic processes, in which BiOI/TiO 2 heterojunctions ( Liao et al, 2021 ) and Z-type Fe 3 O 4 /BiOCl/BiOI heterostructures ( Dang et al, 2022 ) are included. Additionally, semiconductors based on non-stoichiometric bismuth oxyiodides (Bi x O y I z ), also called bismuth-rich bismuth oxyiodides, whose structures exhibit improved stability and whose band structures are more suitable for photocatalytic processes has been reported ( Liu and Zhang, 2014 ; Jin et al, 2017 ).…”

Preparation and performance of aerogel-based BiOI/TiO2 heterojunction photoelectrocatalytic electrodes

“…24 Furthermore, the suitable energy band structure of the BiOI can modify titania to form a p-n type heterojunction, thus facilitating e À separation and transfer. 25,26 In addition, carbon materials typically have good electrical conductivity, adsorption properties, and a rich internal structure. 27,28 This allows for the better adsorption of pollutants and the use of light energy and facilitates the rapid transfer of photogenerated carriers.…”