Hydrothermal synthesis of Se-doped MoS2 quantum dots heterojunction for highly efficient photocatalytic degradation

• Published in: Materials letters 2021-05, Vol.291, p.129537, Article 129537
• Main Authors: Chen, Linjer, Chen, Chiu-Wen, Dong, Cheng-Di
• Format: Article
• Language: English
• Subjects: Catalytic activity; Degradation; Electron paramagnetic resonance; Electron spin; Electrons; Heterojunctions; Materials science; Nanocomposites; Photocatalysis; Photodegradation; Pollutants; Quantum confinement; Quantum dots; Semiconductors; Spin resonance; Synthesis
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2021.129537

[Display omitted] •A new MoSSe QDs was synthesized via simple hydrothermal process.•Photocatalysts exhibits increased specific surface area and photoabsorption.•QDs effectively degraded Congo red (CR) under visible irradiation.•Cycle experiments revealed the outstanding photo-stability and reusability.•The role of O2−, and holes play in photodegradation process is further explored. In this work, we were demonstrated that the synthesis and photocatalytic performance of MoSSe quantum dots (QDs) for degradation of organic pollutants. Congo red (CR) solution was taken as the target compound to check the photocatalysis. As intended, the MoSSe QDs observe enhanced photocatalytic activity approximately 5.26–6.25 times higher compared to bulk components after 60 min under visible light. In addition, the radical-trapping tests and electron spin resonance also demonstrate that superoxide radicals and photo-induced holes are primary reactive species for photodegradation. MoSSe QDs exhibited great photodegradation of CR under simulated sunlight, which mostly refer to the quantum confinement effect from high specific surface area and excellent separation of the photo-induced electron and hole pairs.