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In situ turning defects of exfoliated TiC MXene into Fenton-like catalytic active sites. | LitMetric

In situ turning defects of exfoliated TiC MXene into Fenton-like catalytic active sites.

Proc Natl Acad Sci U S A

College of Environmental Science and Engineering, Biomedical Multidisciplinary Innovation Research Institute, Shanghai East Hospital, Tongji University, Shanghai 200092, China.

Published: January 2023

AI Article Synopsis

Article Abstract

Controllable in situ formation of nanoclusters with discrete active sites is highly desirable in heterogeneous catalysis. Herein, a titanium oxide-based Fenton-like catalyst is constructed using exfoliated TiC MXene as a template. Theoretical calculations reveal that a redox reaction between the surface Ti-deficit vacancies of the exfoliated TiC MXene and HO molecules facilitates the in situ conversion of surface defects into titanium oxide nanoclusters anchoring on amorphous carbon (TiO@C). The presence of mixed-valence Ti (δ = 0, 2, 3, and 4) within TiO@C is confirmed by X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) characterizations. The abundant surface defects within TiO@C effectively promote the generation of reactive oxygen species (ROS) leading to superior and stable Fenton-like catalytic degradation of atrazine, a typical agricultural herbicide. Such an in situ construction of Fenton-like catalysts through defect engineering also applies to other MXene family materials, such as VC and NbC.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9910593PMC
http://dx.doi.org/10.1073/pnas.2210211120DOI Listing

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