Sonocatalytic activity of LuFeO3 crystallites synthesized via a hydrothermal route

doi:10.1016/S1872-2067(15)60941-X

Abstract

Abstract:

LuFeO₃ crystallites of different sizes and morphologies were synthesized via a hydrothermal route. The sonocatalytic properties of the as-synthesized samples were investigated by degrading various organic dyes, including acid orange 7 (AO7), rhodamine B (RhB), methyl orange (MO), and methylene blue (MB), under ultrasonic irradiation, revealing that they exhibit excellent sonocatalytic activity toward the degradation of these dyes. Particularly, the synthesized bar-like particles with lengths of ~3 μm and widths of ~1 μm have the highest sonocatalytic activity, and the degradation percentage of AO7 reaches 89% after 30 min of sonocatalysis. The effects of inorganic anions such as Cl^-, NO₃^-, SO₄^2-, PO₄^3-, and HCO₃^- on the sonocatalysis efficiency were investigated. Hydroxyl radicals (^·OH) detected by fluorimetry using terephthalic acid as a probe molecule were found to be produced over the ultrasonic-irradiated LuFeO₃ particles. The addition of ethanol, which acts as a ^·OH scavenger, leads to quenching of ^·OH radicals and a simultaneous decrease in the dye degradation. This suggests that ^·OH is the dominant active species responsible for the dye degradation.

Key words: Lutetium orthoferrite, Hydrothermal synthesis, Sonocatalytic activity, Hydroxyl radical, Inorganic anion, Degradation of organic dyes

Ming Zhou, Hua Yang, Tao Xian, Yang Yang, Yunchuan Zhang. Sonocatalytic activity of LuFeO₃ crystallites synthesized via a hydrothermal route[J]. Chinese Journal of Catalysis, 2015, 36(11): 1987-1994.

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Sonocatalytic activity of LuFeO₃ crystallites synthesized via a hydrothermal route

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