Bio-synthesized multi-metal oxides with varying Fe/Mn ratios and transitional metals (Ni, Ce, Al, Cu) for catalytic ozonation
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING(2023)
摘要
Fe and Mn are frequently used to synthesize ozonation catalysts via physicochemical routes. In this study, we used a manganese oxidizing bacterium Pseudomonas sp. to produce biogenic Fe-Mn oxides (Bio-FeMnOx) and compared the effect of doping a third transitional metal (Ni, Ce, Al, Cu). It was found that Fe/Mn ratios can effectively regulate the catalytic activity of Bio-FeMnOx and Cu showed the best doping effect among the four metals. The degradation kinetic constant of the optimal Bio-FeMnOx-Cu was approx. 3 times that of its che-mogenic peer. Electron paramagnetic resonance and probe tests revealed that the reactive oxygen species were 'OH, 'O2- and 1O2. The generation of 'OH was preferred at pH 2 over pH 7 while 'O2- was generated in the opposite preference. We also observed the multi-valence of all metals in Bio-FeMnOx-Cu whose good stability were confirmed with 5 cycles of usage. The catalytic performance of Bio-FeMnOx-Cu was also confirmed with real wastewater. This study demonstrated the importance of Fe/Mn ratios and doping a third transitional metal regarding the activity of catalyzing ozonation and thus would provide a valuable reference for producing biogenic metal oxides of high catalytic activity.
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关键词
Biomineralization,Advanced oxidation,Emerging contaminant,Micropollutant,AOP
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