期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 415, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125665
关键词
Mixed oxides; Reactive oxygen species; Fenton-like processes; Wet peroxide oxidation; Methylene blue degradation
资金
- National Science Center, Poland (NCN) [Sonatina2 2018/28/C/ST5/00255, Sonata Bis7 2017/26/E/ST4/00794]
- ASC Master's Course - Erasmus+EMJMD programme
A new mixed niobium-cerium oxide (NbCeOx) catalyst was developed for efficient degradation of organic pollutants, showing high activity attributed to its mixed redox-acidic surface properties and synergy between niobium and cerium species. In degradation of methylene blue (MB) as a model pollutant, NbCeOx exhibited significantly higher activity compared to commercial Nb2O5 CBMM catalyst and CeO2.
Formation of reactive oxygen species (ROS) via H2O2 activation is of vital importance in catalytic environmental chemistry, especially in degradation of organic pollutants. A new mixed niobium-cerium oxide (NbCeOx) was tailored for this purpose. A thorough structural and chemical characterization of NbCeOx along with CeO2 and Nb2O5 reference materials was carried out using TEM/STEM/EDS, SEM, XRD, XPS, EPR, UV-vis and N2 physisorption. The ability of the catalysts to activate H2O2 towards ROS formation was assessed on the basis of EPR and Raman measurements. Catalytic activity of the oxides was evaluated in degradation of methylene blue (MB) as a model pollutant. Very high activity of NbCeOx was attributed to the mixed redox-acidic nature of its surface, which originated from the synergy between Nb and Ce species. These two properties (redox activity and acidity) ensured convenient conditions for efficient activation of H2O2 and degradation of MB. The activity of NbCeOx in MB degradation was found 3 times higher than that of the commercial Nb2O5 CBMM catalyst and 240 times higher than that of CeO2. The mechanism of the degradation reaction was found to be an adsorption-triggered process initiated by hydroxyl radicals, generated on the surface via the transformation of O2-center dot/O22-.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据