Facile construction of 3D hierarchical flake ball-shaped γ-AgI/Bi_2WO_6 Z-scheme heterojunction towards enhanced visible-light photocatalytic performance

摘要

In this work, a series of 3D hierarchical gamma-AgI/Bi2WO6 (AB) Z-scheme heterojunctions with intimate interface contact was synthesized by facile hydrothermal and precipitation method. The optimal proportion of gamma-AgI/Bi2WO6 exhibited superior photocatalytic property during the removal of Rhodamine B (RhB), tetracycline (TC) and ciprofloxacin (CIP). The outstanding photocatalytic capability was probably responsible for the intimate contact among Bi2WO6 flake ball-shaped and gamma-AgI nanoparticle, which could heighten the responsive range of visible-light, promote the separation of photo-generated carriers and fully utilize the strong redox ability of composites. Additionally, the function of active species in the photodegradation was also researched through exploiting trapping tests and electron spin resonance experiments to reveal the vital effect of holes (h(+)) and superoxide anion radicals (center dot O-2(-)). Moreover, the possible Z-scheme photocatalytic mechanism with an internal electric field was also proposed. This study spreads an effective strategy for reasonably devising the Bi2WO6-based photocatalytic system to decontaminate multiple pollutants.