期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 643, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2022.128734
关键词
Metal-organic frame; Cobalt doping; Activation of peroxymonosulfate; Single-atomic dispersion; Confined catalysis
In this work, a cobalt-doped zirconium-based metal-organic framework, Co-UiO-66, was synthesized and used as a Fenton-like catalyst for the degradation of rhodamine B. The catalyst with 4% cobalt showed the highest degradation efficiency, even higher than when cobalt ions were used as an activator. The high catalytic efficiency of Co-UiO-66 is attributed to its single-atomic dispersion, confinement effect, and strong absorption in the visible light region.
Metal-organic frame materials are intensively investigated in catalysis due to their outstanding thermal stability, large specific surface area, and ultra-high porosity. In this work, a cobalt-doped zirconium-based metal-organic framework, Co-UiO-66, was synthesized by the hydrothermal approach. Co-UiO-66 could successfully activate peroxymonosulfate (PMS) ions to produce reactive oxygen species for the degradation of rhodamine B (RhB) when it was used as a Fenton-like catalyst. The catalyst with 4% Co in mass in UiO-66 (4% Co-UiO-66) showed the highest degradation efficiency. About 97.3% of RhB (50 ml of 30 mg L-1) was degraded in 45 min under simulated sunlight when 10 mg of 4% Co-UiO-66 was used. The degradation efficiency was much higher than that when pure UiO-66 was used. Furthermore, it was even slightly higher than when cobalt ions were used as the activator. The single-atomic dispersion and confinement effect in Co-UiO-66, as well as the strong absorption in the visible light region are responsible for the high catalytic efficiency.
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