Flower-like BiOBr decorated stainless steel wire-mesh as immobilized photocatalysts for photocatalytic degradation applications

• Published in: Applied surface science Vol. 494; pp. 492 - 500
• Main Authors: Chang, Chi-Jung, Chao, Pei-Yao, Lin, Kuen-Song
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.11.2019
• Subjects: Calcination; Facet effect; Flower-like BiOBr; Immobilized photocatalyst; Wire mesh; Calcination; Wire mesh; Immobilized photocatalyst; Facet effect; Flower-like BiOBr
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2019.07.203

Stainless steel wire mesh/bismuth oxybromide (BiOBr) were synthesized as immobilized photocatalysts. The effects of conductive wire mesh substrate and calcination on the photocatalytic performance were investigated. The morphology, crystal structure, composition, and optical properties of hierarchical wire mesh/BiOBr photocatalyst were investigated. The degradation of 99% dye can be achieved within 50 min by S250 photocatalyst which was calcined at 250 °C. The recycled photocatalyst also shows good stability. The activity of the immobilized photocatalysts was enhanced by increasing the surface area (flower-like texture of BiOBr), facilitating separation of photogenerated charge carriers (good contact between BiOBr and conductive stainless steel wire mesh), and improving the crystal properties (facet effect, dominant (001) facets by calcination). This study provides a way to optimizing the activity of immobilized photocatalysts for the treatment of hazardous pollutants in wastewater. [Display omitted] •BiOBr/stainless steel interface helps the separation of photogenerated carriers.•Calcined photocatalysts with dominant (001) facet have high activity (facet effect).•Flower-like BiOBr and wire-mesh substrate lead to the high surface area of the photocatalyst.•Lots of transport paths for dye molecules, large contact area, and BiOBr-stainless steel interface lead to high activity.•Degradation of 99% dye can be achieved within 50 min by S250 photocatalyst.