Facile synthesis of bimodal macroporous g-C3N4/SnO2 nanohybrids with enhanced photocatalytic activity

摘要: It is of vital importance to construct highly interconnected, macroporous photocatalyst improve its efficiency and applicability in solar energy conversion environment remediation. Graphitic-like C3N4 (g-C3N4), as an analogy two-dimensional (2D) graphene, identified a visible-light-responsive polymeric semiconductor. Moreover, the feasibility g-C3N4 making porous structures has been well established. However, preparation with abundant networks exposure surface, still constitutes difficulty. To solve it, we report first facile bimodal hybrids in-plane holes, which simply enabled by in-situ modification through thermally treating mixture thiourea SnCl4 (pore modifier) after rotary evaporation. For one hand, formed macropores endow system plentiful active sites short, cross-plane diffusion channels that can greatly speed up mass transport transfer. another, heterojunctions founded between SnO2 consolidate electron transfer reaction reduce recombination probability. As consequence, resulted g-C3N4/SnO2 nanohybrid had high specific surface area (SSA) 44.3 m2/g was quite comparable most nano/mesoporous reported. The interconnected network also rendered intensified light absorption strengthening penetration. Together improved transfer, hybrid exhibited about 2.4-fold increment photoactivity compared pure g-C3N4. Additionally, recyclability such could be guaranteed eight successive uses.