Preparation of Novel Ultrathin Co doped MoS₂ Nanosheets Piezocatalyst for Fast Simultaneous Decomposition of Cr(VI) and MB in Dark

Abstract

Ultrathin Co doped MoS₂ nanosheets(NSs) with thickness of 3.2 nm was used to simultaneously decompose Cr(VI) and MB in dark through ultrasonic vibration-assisted piezocatalytic effect. The significantly enhanced piezocatalytic performance of Co doped MoS₂ NSs was found in comparison to the pristine MoS₂ NSs. The high piezocatalytic activity of Co doped MoS₂ NSs may originate from the large amount of charge carriers due to Co doping. The efficient separation of electron-hole pairs under spontaneous polarization were also investigated in detail, which is responsible for reduction of Cr(VI) and oxidation of methylene blue(MB). The active species trapping experiments demonstrate that e and ^•O₂ ^– are main active substances for Cr(VI) reduction, while h⁺, ^•OH, and ^•O₂ ^– participate in MB degradation.

Keywords

Co doped MoS₂ / Piezocatalytic / Organic dyes / Cr(VI)

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