Abstract
Surface-dispersed Cu2O/Tg-C3N4 composite photocatalysts were synthesized by microwave in-situ liquid-phase depositing of Cu2O nanoparticles upon thermally exfoliated carbon nitride nanoflakes (2Dg-C3N4). The effects of 2Dg-C3N4 pretreatment with ethanol and Cu2O loading on the photocatalytic performance of Cu2O/Tg-C3N4 were investigated. It was demonstrated that the 2Dg-C3N4 pretreatment facilitated the refinement of Cu2O particles and uniform dispersion on the 2Dg-C3N4 surface. The sample with 10.5 % Cu2O (10.5%Cu2O/Tg-C3N4) exhibited the optimal performance in photocatalytic degradation of tetracycline, and its first-order reaction rate constants were 8.6, 8.2, 6.88 and 3.22 times of that of Cu2O, g-C3N4, 7%Cu2O/Tg-C3N4 and 17.5%Cu2O/Tg-C3N4, respectively. The enhanced light absorption and tightly contacted heterojunctions between Cu2O and pretreated 2Dg-C3N4 are the underlying reasons for the remarkable photocatalytic efficiency of 10.5%Cu2O/Tg-C3N4.
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