Persulfate activation by two-dimensional MoS 2 confining single Fe atoms: Performance, mechanism and DFT calculations

• Published in: Journal of hazardous materials Vol. 389; p. 122137
• Main Authors: Huang, Li-Zhi, Zhou, Chu, Shen, Miaolong, Gao, Enlai, Zhang, Chunbo, Hu, Xin-Ming, Chen, Yiqun, Xue, Yingwen, Liu, Zizheng
• Format: Journal Article
• Language: English
• Published: Netherlands 05.05.2020
• Subjects: Single-atom catalyst; Co-catalysis; Persulfate activation; Advanced oxidation process
• ISSN: 1873-3336

Developing efficient catalysts for persulfate (PS) activation is important for the potential application of sulfate-radical-based advanced oxidation process. Herein, we demonstrate single iron atoms confined in MoS nanosheets with dual catalytic sites and synergistic catalysis as highly reactive and stable catalysts for efficient catalytic oxidation of recalcitrant organic pollutants via activation of PS. The dual reaction sites and the interaction between Fe and Mo greatly enhance the catalytic performance for PS activation. The radical scavenger experiments and electron paramagnetic resonance results confirm and SO rather than HO is responsible for aniline degradation. The high catalytic performance of Fe Mo S was interpreted by density functional theory (DFT) calculations via strong metal-support interactions and the low formal oxidation state of Fe in Fe Mo S . Fe Mo S /PS system can effectively remove various persistent organic pollutants and works well in a real water environment. Also, Fe Mo S can efficiently activate peroxymonosulfate, sulfite and H O , suggesting its potential practical applications under various circumstances.