3PO 4 nanoparticle and La 2Ti 2O 7 nanosheet 0D/2D heterojunctions with improved photocatalytic performance]]>

摘要

AbstractIn this paper, we took the initiative to investigate the synthesis and photocatalytic properties of new solar-light active Ag3PO4/La2Ti2O70D/2D heterojunction photocatalysts with 10?wt% ～70?wt% Ag3PO4loading. 2D La2Ti2O7nanosheets modified by uniformly dispersed super-small Ag3PO4nanoparticles with average particle size as small as 4.9?nm were prepared by an in-situ chemical deposition method, and probed by electron microscopy, X-ray diffraction and UV–vis diffuse reflection spectroscopy. The photocatalytic activities were evaluated using Rhodamine B (RhB) as a target organic pollutant under simulated solar light irradiation. The results show that La2Ti2O7nanosheets modified with proper amount of Ag3PO4nanoparticles exhibited much higher photocatalytic activity. The optimal loading amount of Ag3PO4was observed to be 50?wt% with the best photocatalytic performance, which could degrade almost all RhB dyes within 8?min under sunlight irradiation with the highest rate constant value of 0.5632?min?1. The mechanism accounting for the photocatalytic results were also proposed by PL, transient photocurrent response, radical trapping experiments and electron paramagnetic resonance spectra. Moreover, the photocorrosion of Ag3PO4/La2Ti2O7photocatalysts is efficiently suppressed after depositing thin layers of AgI on Ag3PO4nanoparticles.Graphical abstractDisplay OmittedHighlights?A 0D/2D type Ag3PO4/La2Ti2O7heterojunction was prepared firstly.?50?wt% of Ag3PO4loading composite presents the best photocatalytic activity.?A Z-scheme mechanism was proposed.]]>