Key Laboratory of Environmental Materials and Pollution Control, Jilin Normal University, Siping, People's Republic of China.
College of Environmental science and Engineering, Jilin Normal University, Siping, People's Republic of China.
Environ Technol. 2021 Jan;42(4):545-557. doi: 10.1080/09593330.2019.1637462. Epub 2019 Jul 9.
Aniline is a toxic chemical, and in many industries it is degraded by Fenton processes. In this study, an Fe(II)-nano-FeO@PAC heterogeneous Fenton catalyst (MFC) was prepared with a coprecipitation and impregnation method, which is simple, efficient and cost effective. The results of the magnetic performance tests showed that the MFC has typical ferromagnetism properties. Nano-FeO was found both on the surface and inside the pores of the powdered activated carbon (PAC). MFC was found to be an efficient catalyst in the Fenton-like process for aniline degradation. The optimal conditions were obtained by the orthogonal experimental method. The results showed that under the optimal conditions (pH = 3.00, temperature = 20°C, concentration of MFC = 1.0 g/L, concentration of HO = 0.27 g/L), the 5 mg/L aniline solution degradation ratio reached 91.2% and the mineralization ratio reached 75.77% in 30 min. In addition, kinetics studies indicated that the aniline degradation process follows a pseudo-first-order kinetics model. No refractory intermediate such as azobenzene, was found during the reaction. The pH value is an important factor in aniline solution degradation. This result indicates that in addition to the surface catalytic reaction, the Fenton reaction also occurs in solution. Fe/Fe on the MFC surface and Fe/Fe in solution both affect aniline degradation. This catalyst has the advantage of being easily magnetically separated from the aqueous phase. It has useful application prospects in solving organic industrial wastewater pollutions in developing countries because of its cost-effectiveness.
苯胺是一种有毒化学物质，在许多工业领域中，它通过芬顿工艺降解。在这项研究中，采用共沉淀和浸渍法制备了一种 Fe(II)-纳米-FeO@PAC 非均相芬顿催化剂（MFC），该方法简单、高效、经济。磁性性能测试结果表明，MFC 具有典型的铁磁性。纳米-FeO 既存在于粉末状活性炭（PAC）的表面，也存在于其孔内。研究发现，MFC 是一种在类芬顿反应中有效降解苯胺的催化剂。通过正交实验法得到了最佳条件。结果表明，在最佳条件下（pH=3.00、温度=20°C、MFC 浓度=1.0g/L、HO 浓度=0.27g/L），5mg/L 苯胺溶液在 30min 内的降解率达到 91.2%，矿化率达到 75.77%。此外，动力学研究表明，苯胺降解过程遵循拟一级动力学模型。反应过程中未发现难降解的中间产物如偶氮苯。pH 值是影响苯胺溶液降解的重要因素。这一结果表明，除了表面催化反应之外，芬顿反应也发生在溶液中。MFC 表面上的 Fe/Fe 和溶液中的 Fe/Fe 都对苯胺降解有影响。该催化剂具有易于从水相中磁分离的优点，由于其成本效益，在解决发展中国家有机工业废水污染方面具有广阔的应用前景。
