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High Catalytic Activity of Fe3−xCuxO4/Graphene Oxide (0 ≤ x ≤ 0.1) Nanocomposites as Heterogeneous Fenton Catalysts for p-Nitrophenol Degradation

Liu, Mingwang, Jia, Zhenzhen, Li, Peng, Liu, Yunfang, Zhao, Mengjia, Yang, Yizi, Huang, Qigu, Yu, Changyuan
Water, air, and soil pollution 2019 v.230 no.3 pp. 64
catalysts, catalytic activity, chemical oxygen demand, copper, copper nanoparticles, coprecipitation, hydrogen peroxide, iron oxides, nanocomposites, p-nitrophenol, pH, temperature, wastewater treatment
In order to improve the catalytic properties of Fe₃O₄ nanoparticles in wastewater treatment, the Cu-doped Fe₃O₄/graphene oxide (Fe₃₋ₓCuₓO₄/GO) nanocomposites were prepared by a modified co-precipitation method and used as heterogeneous catalyst for p-Nitrophenol (p-NP) degradation. The effect of the GO and Cu contents in the nanocomposites was investigated. Compared with the unsupported Fe₃O₄ nanoparticles, the Fe₃O₄/GO nanocomposites have obviously improved catalytic performance, especially for the nanocomposite with 6.25 wt.% of the GO content. Furthermore, the catalytic efficiency is greatly improved by doping Cu in the nanocomposite. The Fe₃₋ₓCuₓO₄/GO nanocomposite achieves the best catalytic property in our catalyst system when the x value is about 0.075. Under the optimal reaction condition (0.8 g L⁻¹ of catalyst dosage, 15 mmol L⁻¹ of initial H₂O₂ concentration, 3.0 of pH value, and 30 °C of temperature), the p-NP conversion and chemical oxygen demand removal efficiencies in 120 min for the Fe₂.₉₂₅Cu₀.₀₇₅O₄/GO nanocomposite are about 98.4% and 74.7%, respectively. And the p-NP conversion efficiency is still as high as 96.2% after four recycles under the optimum condition. The results clearly show that the Fe₂.₉₂₅Cu₀.₀₇₅O₄/GO nanocomposite has outstanding catalytic properties for the p-NP degradation.