Electrodeposited manganese oxides as efficient photocatalyst for the degradation of tetracycline antibiotics pollutant

被引:26
|
作者
Cestaro, Roberto [1 ,2 ]
Philippe, Laetitia [1 ]
Serra, Albert [1 ,3 ,4 ]
Gomez, Elvira [3 ,4 ]
Schmutz, Patrik [2 ]
机构
[1] Empa Swiss Fed Labs Mat Sci & Technol, Lab Mech Mat & Nanostruct, CH-3602 Thun, Switzerland
[2] Empa Swiss Fed Labs Mat Sci & Technol, Lab Joining Technol & Corros, CH-8600 Dubendorf, Switzerland
[3] Univ Barcelona, Dept Ciencia Mat Quim Fis, Grp Electrodeposicio Capes Primes & Nanoestruct G, Barcelona, Catalonia, Spain
[4] Univ Barcelona, Inst Nanosci & Nanotechnol IN2UB, Catalonia, Spain
关键词
Manganese oxides; Electrodeposition; Photocatalysis; Tetracycline antibiotics; Photocorrosion; Photomineralization mechanism; WASTE-WATER; CATALYTIC OZONATION; RESISTANCE GENES; REMOVAL; PHARMACEUTICALS; ADSORPTION;
D O I
10.1016/j.cej.2023.142202
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
One of the important environmental challenges of the 21st century is the effective removal of pollutants from the aquatic environment. In this study, electrodeposited manganese oxides (MnyOx) films were applied as visible-light-driven photocatalyst for the removal and mineralization of Tetracycline (TC) antibiotics. The photo-catalytic activity of as-deposited and annealed MnyOx was tested at different pH values using LED visible illu-mination, resulting in 92.4 % of TC mineralization efficiency after 180 min for the best performing manganese oxide. Quenching experiments showed that hydroxyl radicals (center dot OH) are the main active species responsible for the TC degradation. The photocorrosion of MnyOx has been studied by quantifying the concentration of the dissolved manganese cations during the photocatalytic experiments. By comparing the catalyst mass loss with the % of TC mineralization, we revealed that the degradation of the oxide surface structure is the factor that, more than the photocorrosion, is limiting the photocatalytic activity of MnyOx films. Finally, the photocatalytic mechanism of TC mineralization is proposed based on the detection of the intermediates species of the miner-alization process by High-Performance Liquid Chromatography Mass-Spectroscopy. The facile synthesis process and the superior mineralization rate can open up a new approach for the possible large-scale utilization of electrodeposited MnyOx films as an effective visible light photocatalyst.
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页数:10
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