Enhanced photocatalytic activity and mechanism of Ti3C2−OH/Bi2WO6:Yb3+, Tm3+ towards degradation of RhB under visible and near infrared light irradiation. (January 2020)

• Record Type: Journal Article
• Authors: Fang, Hongjun; Pan, Yusong; Yin, Minyuan; Pan, Chengling
• Is Part Of: Materials research bulletin. Volume 121(2020)
• Publication Date: 2020-01
• Subjects: Ti3C2−OH Mxene -- Ti3C2−OH/Bi2WO6:Yb3+, Tm3+ -- Photocatalysis -- RhB; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2019.110618
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: Ti3 C2 -OH/Bi2 WO6 :Yb 3+, Tm 3+ was prepared via a facile hydrothermal method. Ti3 C2 -OH/Bi2 WO6 :Yb 3+, Tm 3+ composites accompanied 2D/2D heterojunction with grid-like porous hierarchical structure. Ti3C2 -OH/Bi2 WO6 :Yb 3+, Tm 3+ composite shows significant enhancement on photocatalytic activity. Abstract: It is an effective method to explore full spectrum responsive photocatalyst for improving their photocatalytic activity. Herein, Ti3 C2 −OH/Bi2 WO6 :Yb 3+, Tm 3+ composites were successfully synthesized via a facile hydrothermal method. The resultant Ti3 C2 −OH/Bi2 WO6 :Yb 3+, Tm 3+ composites accompanied 2D/2D heterojunction with grid-like porous structure present a significant enhancement of photoactivity towards degradation of RhB under visible and NIR light irradiation. Specifically, the 0.2-Y/T-TB2.8 composite exhibits the best photocatalytic activity for RhB removal, in which the RhB degradation efficiency was 99.8% (Vis-NIR, 30 min), 91% (Vis, 30 min), and 48% (NIR, 160 min). The excellent photocatalytic activity of the composite is attributed to the grid-like porous structure endowing it with an enhanced RhB adsorption, favorable charge separation resulting from the outstanding conductivity of the Ti3 C2 −OH, and up-conversion mechanism via energy level transition of Yb 3+ /Tm 3+ . In addition, the radical capture experiments verified that the hole (h + ) plays the important role for degradation of RhB.