Direct evidence of the photocatalytic generation of reactive oxygen species (ROS) in a Bi2W2O9 layered-structure

Visible‐Light‐Assisted Photocatalytic Degradation of Phenolic Compounds Using Bi2S3/Bi2W2O9 Heterostructure Materials as Photocatalyst

“…However for BS20BWO photocatalyst significant decrease in the absorption intensity has occurred (Figure S8d). In presence of superoxide radicals, the NBT molecule is selectively reduced to purple formazan which accounts for the observed decrease in the absorption intensity . The absorption spectra of NBT suggest that O 2 .− radicals are formed in aqueous suspension of BS20BWO whereas for pure BWO the formation of this radical is not facilitated.…”

“…OH) and superoxide radicals (O 2 .− ) in aqueous suspension of BS20BWO photocatalyst is studied further by using spectroscopic method. Terephthalic acid (TA) and nitroblue tetrazolium (NBT) are used as probe molecules for spectroscopic identification of hydroxyl and superoxide radicals, respectively (Figure S8) ,. The .…”

“…Because of the unique layered structure, Bi 2 W 2 O 9 has been used as a precursor to prepare (W 2 O 7 ) 2– nanosheets by acid treatment followed by exfoliation of the layer structure ,. Although, Bi 2 W 2 O 9 possesses desirable characteristics for photocatalytic oxidation reactions, very few studies have been reported so far highlighting its photocatalytic property ,. Kudo et.…”

“…have reported that Bi 2 W 2 O 9 exhibited nearly 10 times higher photocatalytic efficiency than Bi 2 WO 6 for hydrogen evolution reaction under UV light illumination . Similarly, Bi 2 W 2 O 9 synthesized by co‐precipitation has been studied for rhodamine B, marine plankton and ciprofloxacin drug mineralization from aqueous media . The method of synthesis has been found to be a crucial factor in influencing the photocatalytic efficiency.…”

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

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J o u r n a l P r e -p r o o f 2 Graphical Abstract Highlights  Photoactive TiO2 nanomaterials can solve the actual microbial infectious defies  The microbial cell/TiO2 surface approach is key to get the photo-kill mechanism  Microbial preparation requires a reproducible protocol for proper characterization  Advanced surface characterization techniques can unravel the photo-kill mechanism  Generation of ROS, physical injuries and biocidal features confirm the annihilation J o u r n a l P r e -p r o o f Abstract The approach of this timely review considers the current literature that is focused on the interface nanostructure/cell-wall microorganism to understand the annihilation mechanism. The photogenerated hole can migrate to the surface of the material and react with water molecules or hydroxyl ions to produce hydroxyl radicals, while the photoexcited electron in the conduction band can react with the adsorbed molecular oxygen to produce superoxide ions [8]. The key parameters of the tailoring the surface of the photoactive nanostructures such as the metal functionalization with bacteriostatic properties, hydrophilicity, textural porosity, morphology and the formation of heterojunction systems, can achieve the effective eradication of the microorganisms under natural conditions, ranging from practical to applications in environment, agriculture, and so on.

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