Key Words:Tungsten compounds;Carbon nitride - Decontamination - Photocatalytic activity - Water pollution - Water recycling
Abstract:A strong interfacial contact of heterostructured photocatalysts plays a key role in charges migration, thus promoting photocatalytic performance. Benefiting from the unique two-dimensional (2D) morphology and abundant terminals, 2D/2D "face-to-face" WO<inf>3</inf>·H<inf>2</inf>O/g-C<inf>3</inf>N<inf>4</inf> heterostructured self-assemblies were fabricated employing tungsten oxide hydrate (WO<inf>3</inf>·H<inf>2</inf>O) nanoplates and graphitic carbon nitride (g-C<inf>3</inf>N<inf>4</inf>) sheets as precursors. Compared to pristine WO<inf>3</inf>·H<inf>2</inf>O and g-C<inf>3</inf>N<inf>4</inf>, the binary WO<inf>3</inf>·H<inf>2</inf>O/g-C<inf>3</inf>N<inf>4</inf> heterostructures exhibit excellent photocatalytic performance towards water decontamination, using organic dye rhodamine B/methyl orange as probes. It is found that WO<inf>3</inf>·H<inf>2</inf>O/g-C<inf>3</inf>N<inf>4</inf> with 20 wt% mass ratio (WHC-20) possesses the best photocatalytic activities, with about 3.05 times higher than that of pristine g-C<inf>3</inf>N<inf>4</inf>. The remarkable increase performance is attributed to the enhanced evolution of superoxide radicals (·O<inf>2</inf><sup>−</sup>) via photoreduction in adsorbed oxygen molecules (O<inf>2</inf><sup>−</sup>), which are promoted by efficient Z-scheme charges separation and rapid electrons transfer at 2D/2D interface. Given the low-cost, facile synthetic procedure and recycling stability, the heterostructured WO<inf>3</inf>·H<inf>2</inf>O/g-C<inf>3</inf>N<inf>4</inf> could be served as a promising photocatalyst to deal with water contamination.<br/> © 2019, Springer Science+Business Media, LLC, part of Springer Nature.
Volume:55
Issue:10
Translation or Not:no