화학공학소재연구정보센터
Journal of Materials Science, Vol.55, No.10, 4238-4250, 2020
2D/2D WO3 center dot H2O/g-C3N4 heterostructured assemblies for enhanced photocatalytic water decontamination via strong interfacial contact
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" WO3 center dot H2O/g-C3N4 heterostructured self-assemblies were fabricated employing tungsten oxide hydrate (WO3 center dot H2O) nanoplates and graphitic carbon nitride (g-C3N4) sheets as precursors. Compared to pristine WO3 center dot H2O and g-C3N4, the binary WO3 center dot H2O/g-C3N4 heterostructures exhibit excellent photocatalytic performance towards water decontamination, using organic dye rhodamine B/methyl orange as probes. It is found that WO3 center dot H2O/g-C3N4 with 20 wt% mass ratio (WHC-20) possesses the best photocatalytic activities, with about 3.05 times higher than that of pristine g-C3N4. The remarkable increase performance is attributed to the enhanced evolution of superoxide radicals (center dot O-2(-)) via photoreduction in adsorbed oxygen molecules (O-2(-)), 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 WO3 center dot H2O/g-C3N4 could be served as a promising photocatalyst to deal with water contamination.