Journal
CHEMICAL ENGINEERING JOURNAL
Volume 417, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127987
Keywords
Defect engineering; Molybdenum disulfide; Reduction of Fe3+; Persulfate activation
Categories
Funding
- National Key Research and Development Program of China [2016YFC0400708]
- National Natural Science Foundation of China [51572089]
- Natural Science Foundation of Guangdong Province, China [2019A1515011761]
- Foundation of Science and Technology Planning Project of Guangzhou, China [201804010398]
- State Key Laboratory of Pulp and Paper Engineering [2020C01]
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Introducing S defects in MoS2 as a co-catalyst in Fe3+/PS system can significantly enhance the persulfate activation efficiency, thereby improving the performance of Fe3+/PS system.
Advanced oxidation processes (AOPs) based on persulfate (PS) has attracted great attention because of its outstanding performance for decomposing chlorinated aromatic hydrocarbons in wastewater. While Fe-based materials can effectively activate PS and are environment-friendly, the low stability of Fe2+ and little activation capability of Fe3+ limit the broad applications of Fe2+ (or Fe3+) activated PS system in practical applications. In this work, taking molybdenum disulfide (MoS2) as the co-catalyst in Fe3+/PS system, we report a strongly enhanced persulfate activation efficiency of Fe3+/PS system by engineering S defects in MoS2. The combination of experiments and density functional theory (DFT) calculation demonstrate that S defects in MoS2 modify the surface charge distribution, leading to the formation of an electron deficient center near S defect and increasing the electron density near Mo site. As a result, more Fe3+ in Fe3+/PS system is reduced into Fe2+ by MoS2 with S defects, resulting in more reactive oxygen species generated. Furthermore, S defects promote the adsorption of Fe3+ on the MoS2 surface, which further enhance the activating performance for PS through promoting to form cycle of Fe3+/Fe2+. This work provides a new strategy for improving co-catalytic properties of MoS2 and expands the application of Fe3+/PS system for contaminants remediation.
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