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Selective hydroxyl generation for efficient pollutant degradation by electronic structure modulation at Fe sites.
- Source :
- Proceedings of the National Academy of Sciences of the United States of America; 6/27/2023, Vol. 120 Issue 26, p1-10, 42p
- Publication Year :
- 2023
-
Abstract
- Hydrogen peroxide (H<subscript>2</subscript>O2) is an important green oxidant in the field of sewage treatment, and how to improve its activation efficiency and generate free radicals with stronger oxidation performance is a key issue in current research. Herein, we synthesized a Cu-doped α-Fe<subscript>2</subscript>O<subscript>3</subscript> catalyst (7% Cu-Fe<subscript>2</subscript>O<subscript>3</subscript>) for activation of H<subscript>2</subscript>O<subscript>2</subscript> under visible light for degradation of organic pollutants. The introduction of a Cu dopant changed the d-band center of Fe closer to the Fermi level, which enhanced the adsorption and activation of the Fe site for H<subscript>2</subscript>O<subscript>2</subscript>, and the cleavage pathway of H<subscript>2</subscript>O<subscript>2</subscript> changed from heterolytic cleavage to homolytic cleavage, thereby improving the selectivity of ⋅OH generation. In addition, Cu doping also promoted the light absorption ability of α-Fe<subscript>2</subscript>O<subscript>3</subscript> and the separation of hole-electron pairs, which enhanced its photocatalytic activities. Benefiting from the high selectivity of ⋅OH, 7% Cu-Fe<subscript>2</subscript>O<subscript>3</subscript> exhibited efficient degradation activities against ciprofloxacin, the degradation rate was 3.6 times as much as that of α-Fe<subscript>2</subscript>O<subscript>3</subscript>, and it had good degradation efficiency for a variety of organic pollutants. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00278424
- Volume :
- 120
- Issue :
- 26
- Database :
- Complementary Index
- Journal :
- Proceedings of the National Academy of Sciences of the United States of America
- Publication Type :
- Academic Journal
- Accession number :
- 165102763
- Full Text :
- https://doi.org/10.1073/pnas.2305378120