Catalytic Degradation of Phenol and p-Nitrophenol Using Fe3O4/MWCNT Nanocomposites as Heterogeneous Fenton-Like Catalyst
2017
Tian, Xiaojun | Liu, Yunfang | Chi, Weidong | Wang, Yu | Yue, Xiuzheng | Huang, Qigu | Yu, Changyuan
Fe₃O₄ decorated multi-walled carbon nanotube (Fe₃O₄/MWCNT) nanocomposites were synthesized by co-precipitation process and used as heterogeneous Fenton catalyst for degradation of phenol and p-nitrophenol (p-NP). The Fe₃O₄ nanoparticles with size less than 20 nm were well-dispersedly coated on the surface of MWCNTs at relatively low loading. Some aggregations appear at high Fe₃O₄ content in composite. The Fe₃O₄/MWCNT with about 25 wt.% of Fe₃O₄ is the most cost-effective catalyst compared with others, whose phenol conversion and COD removal rates could, respectively, reach to 99.20 and 58.09%. And a high H₂O₂ utilization efficiency was achieved (about 132.41%) for this catalyst. For the p-NP degradation, the optimal reaction condition was that: 2.0 mg/L of catalyst dosage, 3 mmol/L of initial H₂O₂ concentration, 3 of pH value, and 40 °C of reaction temperature. At this condition, the removal rates of p-NP and COD in 120 min achieved 97.16 and 67.71%, respectively. And the Fe₃O₄/MWCNT nanocomposite also exhibits an acceptable stability and reusability.
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