LBJG-028 Two-step method to prepare the direct Z-scheme heterojunction hierarchical flower-like 2 Ag@AgBr/Bi2MoO6 microspheres photocatalysts for waste water treatment under visible light
作者：Two-step method to prepare the direct Z-scheme heterojunction hierarchical flower-like Ag@AgBr/Bi2Mo
關鍵字：Z-scheme heterojunction; Flower-like photocatalyst; Hierarchical hollow microspheres; Visible-light response; Ag@AgBr/Bi2MoO6
論文來源：期刊
具體來源：Journal of Materials Science: Materials in Electronics
發表時間：2020年
In this study, a novel Z-scheme Ag@AgBr/Bi 2 MoO 6 heterojunction photocatalyst
was synthesized via a two-step process: the hierarchical flower-like Bi 2 MoO 6
microspheres were synthesized; Ag and AgBr were decorated to Bi 2 MoO 6
microspheres. As an environmentally friendly catalyst, it can selectively achieve the
conversion of organic pollutants without producing by-products via solar energy
irradiation. Visible light excites Bi 2 MoO 6 and AgBr nanoparticles to generate
electron-hole pairs. Due to the high conductivity of Ag nanoparticles, electrons are
conducted to AgBr via Ag nanoparticles and recombined electrostatically with hole of
AgBr, which effectively inhibits the recombination of photo-generated hole-electron
pairs. The unique electron transport path and flower-like microsphere structure allow
free radicals to fully react with organic matter. The enhanced photocatalytic
performance of the photocatalyst was evaluated by photodegradation of RB-19 under
visible light irradiation. After 120 min irradiation, the degradation rate of Ag@AgBr/Bi 2
MoO 6 to RB-19 reached 98.7%, which is much greater than the degradation
performance of AgBr/Bi 2 MoO 6 and Bi 2 MoO 6 . At the same time, after five
cycles of testing, the ternary composite still has a degradation rate of 70%. In addition,
the results of capture experiments showed that ?O 2 - and h + are the main active
substances for the decomposition of RB-19 dye molecules. The Mott-Schottky diagram
explains the band structure of the catalyst. So, this study provides a new method for
preparing Z-type photocatalysts and opens up new possibilities for selective organic
conversion.