Journal
ENVIRONMENTAL TECHNOLOGY
Volume 42, Issue 4, Pages 545-557Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2019.1637462
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Funding
- National Natural Science Foundation of China [51708250]
- Project of the Department of Science & Technology of Jilin Province [20180623042TC]
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An Fe(II)-nano-Fe3O4@PAC heterogeneous Fenton catalyst was prepared for efficient aniline degradation, showing high degradation rates under optimal conditions. The catalyst has a cost-effective advantage and can be easily magnetically separated, making it promising for applications in treating organic industrial wastewater pollution in developing countries.
Aniline is a toxic chemical, and in many industries it is degraded by Fenton processes. In this study, an Fe(II)-nano-Fe3O4@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-Fe3O4 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 degrees C, concentration of MFC = 1.0 g/L, concentration of H2O2 = 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. Fe2+/Fe3+ on the MFC surface and Fe2+/Fe3+ 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.
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