Defect-engineering of Pt/Bi₄NbO₈Br heterostructures for synergetic promotional photocatalytic removal of versatile organic contaminants

Abstract

Defective Pt/Bi4NbO8Br composites were fabricated via a facile in situ chemical reduction method. The synergistic effect of Pt and oxygen vacancies endows the hybrid photocatalysts with enhanced efficiency for versatile organic pollutant removal.

Zinc Vacancy Promotes Photo‐Reforming Lignin Model to H2 Evolution and Value‐Added Chemicals Production

“…And then, Pt was loaded on the V Zn ‐ZIS nanosheets by the impregnation method, and the existence of Zn vacancies has the tendency to anchor Pt atom (Pt/V Zn ‐ZIS), which could stabilize the Zn defects in turn. [ 17,20 ]…”

“…[ 16 ] It has been found that the dispersion of metal atoms can be effectively promoted on defect‐rich supports, and exposing more active sites. Besides that, cation defects have the ability to anchor metal atoms, [ 17 ] and it can not only further improve the stability of cation defects, but also form Schottky junction, which effectively promote electron transfer at the metal‐semiconductor interface. [ 18 ]…”

“…[16] It has been found that the dispersion of metal atoms can be effectively promoted on defect-rich supports, and exposing more active sites. Besides that, cation defects have the ability to anchor metal atoms, [17] and it can not only further improve the stability of cation defects, but also form Schottky junction, which effectively promote electron transfer at the metalsemiconductor interface. [18] In this work, Pt atom uniformly anchored onto zinc-vacancyriched ZnIn 2 S 4 (Pt/V Zn -ZIS) photocatalyst was constructed by modulating the coordination environment of ZIS and using impregnation method.…”

Highly selective photocatalytic oxidation of 5-hydroxymethylfurfural by interfacial Pt–O bonding Pt–Ov–BiOBr

“…The reaction activity diminishes sharply when the Pt loading exceeds 3 wt% because the larger Pt loading inhibits the active site of the Ov-BiOBr surface cavities employed for HMF oxidation. 39 As can be seen, the loading increases a little from 1 wt% to 3 wt% conversions, and the selectivity is flat. The simultaneous operation of the Pt-Ov-BiOBr selective oxidation reaction and degradation reaction may have prevented 100% selectivity from being achieved.…”

New insights into the synthesis of Sillén–Aurivillius oxyhalides: molten salts induce interlayer halogen competing reaction

“…However, high temperature also induces the loss of halogen [X] elements, creating deep-level defects, which serve as recombination centers, hindering the transport of photogenerated charge carriers and reducing the photocatalytic performance. 23,24 Based on this, the molten-salt synthesis (MSS) method has been widely used for the fabrication of Sillén–Aurivillius oxyhalides given that it can offer a special liquid reaction environment that expedites the diffusion rate of reactive elements and motivates the formation of high-purity and uniform reaction products. 25,26 Because Sillén–Aurivillius oxyhalides contain halogen elements (F, Cl, Br, and I), most Bi-based materials are grown with the same molten salt as halogen.…”