Step-like-scheme (S-scheme) heterojunctions have demonstrated
their
superiority in regulating the directional migration of photo-generated
carriers for artificial photosynthesis. However, adjusting the S-scheme
charge transfer at the nanostructure interface of the heterostructure
is a big challenge. Herein, a novel S-scheme AgBr–polyimide
(PI) heterojunction was prepared by in situ deposition of AgBr nanoparticles
on polyimide conjugated polymer, which was employed as a base material
to anchor AgBr nanoparticles via nitrogen–metal bonds. The
optimized AgBr–PI sample, coupling 50 wt % AgBr with PI, shows
the highest photocatalytic activity, which could completely remove
10 ppm biphenyl A (BPA) within 15 min under simulated solar visible
light. The improvement of the photocatalytic performance was attributed
to the valid S-scheme charge transfer mode through building strong
interfacial interaction between AgBr and PI, which accelerated the
charge separation and retained strong redox abilities. At the same
time, the S-scheme charge transfer mechanism is confirmed by electron
paramagnetic resonance and in situ irradiated X-ray photoelectron
spectroscopy.
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