Synergetic photocatalytic effect between 1T@2H-MoS2 and plasmon resonance induced by Ag quantum dots

摘要

Semiconductor phase transitions and plasma noble metal quantum dots (QDs) for visible-lightdriven photocatalysts have attracted significant research interest. In this study, novel microwave hydrothermal and photo-reduction methods are proposed to synthesise a visible-light-driven plasma photocatalytic lT@2H-MoS2/Ag composite. Photoelectrochemical results show that the introduction of the IT phase and Ag significantly enhances the light response range and charge separation. The IT phase can act as a co-catalyst to provide a high electron concentration. Ag QDs can effectively improve the light absorption and catalytic effect. The synergistic effect between the 1T@2H-MoS2 microspheres and localised surface plasmon resonance of the Ag QDs can effectively enhance the photocatalytic activity of lT@2H-MoS2/Ag. The developed lT@2H-MoS2/Ag composite is superior, not only with respect to a visible-light photocatalytic degradation of conventional dyes, but also in the photocatalytic reduction of Cr(VI). Compared with 2H-MoS2, the catalytic efficiency of lT@2H-MoS2/Ag for Cr(VI) and MB is increased by 81% and 41%, respectively. This study demonstrates that the introduction of 1T-MoS2 and Ag QDs can significantly enhance the catalytic properties of 2H-MoS2 The microwave and photoreduction technologies can be employed as green, safe, simple, and rapid methods for the synthesis of noble metal plasma composites.