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首页> 外文期刊>RSC Advances >Photoassisted hetero-Fenton degradation mechanism of Acid Blue 74 by a gamma-Fe2O3 catalyst
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Photoassisted hetero-Fenton degradation mechanism of Acid Blue 74 by a gamma-Fe2O3 catalyst

机译：γ-Fe2O3催化剂光辅助杂化-Fenton降解酸性蓝74

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Fusiform-like maghemite particles were prepared through a distinct two-step transformation from Fe(II) to gamma-FeOOH and then to gamma-Fe2O3 by precipitation and calcination respectively. The structure and property of the as-prepared sample were characterized by XRD, SEM, XPS, UV-vis and FTIR. The degradation of Acid Blue 74 by gamma-Fe2O3 was investigated under visible light irradiation. H-1 NMR, TOC, UV-vis, direct infusion-ESI-(-) MS and FTIR spectroscopic techniques provide an insight into the nature of the degradation products. A more complete degradation mechanism of Acid Blue 74 on gamma-Fe2O3 was presented. The results indicate the total degradation rate is close to 100% for a 100 mg L-1 Acid Blue 74 solution. Among them, about 60% was completely mineralized and the other 40% was degraded to aliphatic acids. The magnetic gamma-Fe2O3 could be conveniently recovered by applying a magnet and recycled. The gamma-Fe2O3 retained 100% degradation capacity for Acid Blue 74 after 6 cycles.
机译：通过从Fe（II）到γ-FeOOH，然后分别通过沉淀和煅烧到γ-Fe2O3的独特的两步转化过程，制备了梭状状磁赤铁矿颗粒。通过XRD，SEM，XPS，UV-vis和FTIR表征了所制备样品的结构和性质。在可见光照射下研究了γ-Fe2O3对酸性蓝74的降解。 H-1 NMR，TOC，UV-vis，直接输注-ESI-（-）MS和FTIR光谱技术可帮助您了解降解产物的性质。提出了酸性蓝74在γ-Fe2O3上更完整的降解机理。结果表明，对于100 mg L-1酸性蓝74溶液，总降解率接近100％。其中约60％完全矿化，其余40％降解为脂肪酸。磁性γ-Fe2O3可以通过施加磁铁方便地回收并回收。 6个循环后，γ-Fe2O3保留了对酸性蓝74的100％降解能力。

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