科研之友
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摘要
In this study, the degradation and mineralization of two dyes were investigated through heterogeneous Fenton using modified magnetite nanoparticles (Fe3 - x - yNbxMoyO4). The Nb and Mo substituted magnetite samples were prepared by co-precipitation method and characterized by BET, XRD, TEM, XPS, VSM and chemical experiments. The emphasis was primarily on examining the effects of external energy sources on the activity of the Fe2.79Mo0.13O4, Fe2.79Nb0.19O4 and Fe2.79Nb0.171Mo0.023O4 nanoparticles in Fenton reaction. Methylene blue (MB) and methyl orange (MO) were chosen as the model cationic and anionic dyes. All samples showed exceptional activities in Fenton reaction under the influence of UV and ultrasound (US) energy compared to unmodified magnetite sample. The incorporated Nb and Mo significantly accelerated the MB degradation in US/Fenton followed by UV-B/Fenton and UV-A/Fenton reactions. However, the UV-B/Fenton was more effective in degradation of MO compared to other oxidation systems. Under all the studied conditions, co-doped Nb-Mo-magnetite nanoparticles showed highest activity in comparison to single Nb- and Mo-substituted magnetite samples. MB degradation through both UV and US/Fenton reactions were well described by pseudo-first-order equations in kinetics. The employed catalysts showed acceptable stability under the influence of UV and US irradiations. Although, the amount of leached Nb was relatively higher than Fe and Mo in acidic condition and under UV irradiation, the loss in the performance of the samples was insignificant. The results obtained from this work indicated that it is possible to treat wastewaters effectively by developing nano-catalysts with slight modification in naturally available compounds and using the existing advanced oxidation system.
- 出版日期2016-10
