Two-Dimensional Silver Bismuth Oxide/Bismuth Molybdate Z-Scheme Heterojunctions with Rich Oxygen Vacancies for Improved Pollutant Degradation and Bacterial Inactivation

Abstract

The effective removal of organic pollutants and bacteria are of great significance considering the hazards to the environment and human health. The two-dimensional AgBiO3/Bi2MoO6 heterojunction with rich oxygen vacancies was successfully fabricated via a hydrothermal method and systematically characterized by various analytical techniques. The photocatalytic experimental results revealed that the addition of AgBiO3 improved the photocatalytic performance of Bi2MoO6, and the AgBiO3/Bi2MoO6-10 heterojunction possessed the best degradation effect toward RhB (72%) within 100 min, with 1.38 and 1.44 times higher activity than pure Bi2MoO6 and AgBiO3, respectively. The bacteria were completely inactivated within 90 min by AgBiO3/Bi2MoO6-10 heterojunction. The reason for the enhancement of photocatalytic activity was the synergistic effect between AgBiO3 and Bi2MoO6. The constructed Z-scheme heterojunction with oxygen vacancies improved the separation efficiency of photo-induced electrons and holes and broadened the range of visible-light absorption. The trapping experiments and ESR indicated that superoxide radical and holes were the main reactive species.