期刊
APPLIED SURFACE SCIENCE
卷 484, 期 -, 页码 1118-1127出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2019.04.182
关键词
Delafossite; Peroxymonosulfate; Orange I; AOPs
类别
资金
- National Natural Science Foundation of China [51872056, 51178134, 51378141]
- Fundamental Research Funds for the Central Universities (HEUCFG)
- Ten Thousand Talent Program [W02020249]
- Heilongjiang Natural Science Foundation [LC2017020]
Delafossite CuFeO2 is a promising material for heterogeneous activation of peroxymonosulfate (PMS), while effect of different crystal types on its activity has not been reported. In this work, pure rhombohedral CuFeO2 (3R-CFO) and a mixture of rhombohedral and hexagonal phases CuFeO2 ((3R + 2H)-CFO) are successfully synthesized by a simple hydrothermal method, and an efficient PMS activation system is set up. Compared with pure 3R-CFO, the introduction of hexagonal phase (2H-CFO) markedly enhances the removal of Orange I (OI). Visible-light response accelerating PMS conversion is observed, and 3R-CFO plays a critical role in such synergetic reaction under natural light illumination. Moreover, it is uncovered that the mixed (3R + 2H)-CFO crystals enhance the exposed Lewis sites of Cu+ and Fe3+, the concentration of surface hydroxyl groups, and the electron transfer. These are important for excellent activity of (3R + 2H)-CFO. SO4 center dot(-) and center dot OH both take part in the oxidation process, accompanying the dominant contribution of SO4 center dot(-). The electron transfer of Cu2+/Cu+ and Fe3+/Fe2+ cycles facilitates the decomposition of PMS to generate reactive radicals.
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