Heterogeneous activation of peroxymonosulfate by a novel magnetic 3D γ-MnO2@ZnFe2O4/rGO nanohybrid as a robust catalyst for phenol degradation
Heterogeneous activation of peroxymonosulfate by a novel magnetic 3D γ-MnO2@ZnFe2O4/rGO nanohybrid as a robust catalyst for phenol degradation
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DOI：
10.1016/j.apcatb.2018.11.086
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发表时间：
2019-05
期刊：
影响因子：
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通讯作者：
A. Mady;Marjorie Baynosa;D. Tuma;J. Shim
中科院分区：
文献类型：
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作者：
A. Mady;Marjorie Baynosa;D. Tuma;J. Shim
采用一锅水热自组装方法合成了三维(3D) γ- mno2 @ znfe2o4 /还原氧化石墨烯（rGO）纳米杂化体。研究了纳米杂交体的形貌和性能。γ- mno2、znfe2o4和还原氧化石墨烯之间的协同作用导致三维纳米片均匀分布在还原氧化石墨烯结构中，厚度约为2 - 5 nm，具有较高的比表面积。含有10 wt.%还原氧化石墨烯的纳米杂化物通过活化过氧单硫酸盐（PMS）生成活性硫酸盐自由基（so4•-），表现出优异的苯酚降解催化活性。通常，在25°C下，使用10 mg纳米杂化物，在30分钟内，50 mL 20 ppm的苯酚溶液被完全降解，85%的碳含量被矿化。纳米杂化物可以很容易地利用磁铁回收和再利用，在催化氧化过程中保持高稳定性。三维γ- mno2 @ znfe2o4 /rGO纳米杂化催化剂具有高效、可重复使用等优点，可用于难降解废弃物的脱除。
Abstract Three-dimensional (3D) γ-MnO 2@ ZnFe 2 O 4/reduced graphene oxide (rGO) nanohybrids were synthesized using a one-pot hydrothermal self-assembly method. The morphology and properties of the nanohybrids were investigated. The synergistic interactions among γ-MnO 2, ZnFe 2 O 4, and rGO resulted in 3D nanoflakes distributed uniformly in the rGO structure with a thickness of approximately 2–5 nm, leading to a high surface area. The nanohybrid containing 10 wt.% rGO exhibited superior catalytic activities for phenol degradation through the activation of peroxymonosulfate (PMS) to generate active sulfate radicals (S O 4•–). Typically, 50 mL of a 20 ppm phenol solution was degraded completely and 85% of the carbon content had been mineralized in 30 min at 25° C using 10 mg of the nanohybrid. The nanohybrid could be recovered easily using a magnet and reused, maintaining high stability during catalytic oxidation. The 3D γ-MnO 2@ ZnFe 2 O 4/rGO nanohybrid catalyst could be applied to the removal of hard-to-degrade waste materials owing to its high efficiency and excellent reusability.