Sha Xuelong, Ma Wei, Meng Fanqing, Wang Ren, Fuping Tian, Wei Linsen
The Institute of Seawater Desalination and Multipurpose Utiliazation, State Oceanic Administration (SOA)(Tianjin), China.
Water Environ Res. 2016 Dec 1;88(12):2219-2227. doi: 10.2175/106143016X14733681695762.
In this study, we explored an effective and low-cost catalyst and its adsorption capacity and catalytic capacity for Methyl Orange Fenton oxidation degradation were investigated. The catalyst was directly prepared by reuse of magnetic iron oxide (Fe3O4) after saturated adsorption of vanadium (V) from waste SCR (Selective Catalytic Reduction) catalyst. The obtained catalyst was characterized by FTIR, XPS and the results showed that vanadium (V) adsorption process of Fe3O4 nanoparticles was non-redox reaction. The effects of pH, adsorption kinetics and equilibrium isotherms of adsorption were assessed. Adsorption of vanadium (V) ions by Fe3O4 nanoparticles could be well described by the Sips isotherm model which controlled by the mixed surface reaction and diffusion (MSRDC) adsorption kinetic model. The results show that vanadium (V) was mainly adsorbed on external surface of the Fe3O4 nanoparticles. The separation-recovering tungsten (VI) and vanadium (V) from waste SCR catalyst alkaline solution through pH adjustment was also investigated in this study. The results obtained from the experiments indicated that tungsten (VI) was selectively adsorbed from vanadium (V)/tungsten (VI) mixed solution in certain acidic condition by Fe3O4 nanoparticle to realize their recovery. Tungsten (V) with some impurity can be obtained by releasing from adsorbent, which can be confirmed by ICP-AES. The Methyl Orange degradation catalytic performance illustrated that the catalyst could improve Fenton reaction effectively at pH = 3.0 compare to Fe3O4 nanoparticles alone. Therefore, Fe3O4 nanoparticle adsorbed vanadium (V) has a potential to be employed as a heterogeneous Fenton-like catalyst in the present contribution, and its catalytic activity was mainly evaluated in terms of the decoloration efficiency of Methyl Orange.
在本研究中，我们探索了一种高效低成本的催化剂，并对其对甲基橙芬顿氧化降解的吸附容量和催化容量进行了研究。该催化剂是通过对废选择性催化还原（SCR）催化剂中的钒（V）进行饱和吸附后，对磁性氧化铁（Fe3O4）进行再利用直接制备而成。采用傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）对所得催化剂进行了表征，结果表明Fe3O4纳米颗粒对钒（V）的吸附过程为非氧化还原反应。评估了pH值、吸附动力学和吸附平衡等温线的影响。Fe3O4纳米颗粒对钒（V）离子的吸附可用由混合表面反应和扩散（MSRDC）吸附动力学模型控制的Sips等温线模型很好地描述。结果表明，钒（V）主要吸附在Fe3O4纳米颗粒的外表面。本研究还考察了通过调节pH值从废SCR催化剂碱性溶液中分离回收钨（VI）和钒（V）。实验结果表明，在一定酸性条件下，Fe3O4纳米颗粒可从钒（V）/钨（VI）混合溶液中选择性吸附钨（VI）以实现其回收。通过从吸附剂中释放可得到含有一些杂质的钨（V），这可通过电感耦合等离子体发射光谱法（ICP-AES）得到证实。甲基橙降解催化性能表明，与单独的Fe3O4纳米颗粒相比，该催化剂在pH = 3.0时能有效促进芬顿反应。因此，吸附了钒（V）的Fe3O4纳米颗粒有潜力作为一种非均相类芬顿催化剂，其催化活性主要通过甲基橙的脱色效率来评估。
