Ferric (hydr)oxide/mesoporous carbon composites as Fenton-like catalysts for degradation of phenol
Ferric (hydr)oxide/mesoporous carbon composites as Fenton-like catalysts for degradation of phenol
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DOI：
10.1007/s11164-018-3358-4
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发表时间：
2018-03
影响因子：
3.3
通讯作者：
Meng Ren;X. Qian;Mengyuan Fang;Dongting Yue;Yixin Zhao
中科院分区：
文献类型：
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作者：
Meng Ren;X. Qian;Mengyuan Fang;Dongting Yue;Yixin Zhao
氧化铁（Fhy）是自然环境中分布最广泛的铁化合物，参与土壤和沉积物中的光化学过程和活性氧的产生。通过70 °C的水热法制备了三种典型的Fhy/介孔碳（Fhy/MC）复合材料，其中Fhy纳米颗粒（NP）、纳米棒（NR）和/微米棒（MR）在MC材料内结晶和/或附着在MC材料上。我们探讨了在近中性pH值（pH = 5）的过氧化氢的存在下，苯酚的Fenton样氧化和矿化的性能。结果表明，与其他两种含有较大Fhy NR或MR的Fhy/MC复合材料相比，Fhy NP/MC复合材料具有更高的催化活性，且在5次循环后仍保持较高的催化活性。可见光照射能明显促进苯酚的氧化性能和H2 O2的分解，这是由于可见光照射能使HO·的生成量增加。羟基自由基测量还揭示了Fhy和MC之间的协同效应。
Ferric (hydr)oxide (Fhy) is the most widespread iron compound in natural environments which participates in the photochemical process and production of reactive oxygen species in soil and sediment. Three typical Fhy/mesoporous carbon (Fhy/MC) composites in which Fhy nanoparticles (NPs), nanorods (NRs) and/microrods (MRs) crystallized within and/or attached on MC materials were prepared by a hydrothermal process at 70 °C. We explored the performance of Fenton-like oxidation of phenol and mineralization in the presence of H2O2 at a near-neutral pH value (pH = 5). The results showed that Fhy-NP/MC composite in which Fhy NPs were encapsulated in MC frameworks showed the highest catalytic performance due to the plentiful active surface available in comparison with the other two Fhy/MC composites containing larger Fhy NRs or MRs. The recycling test showed Fhy-NP/MC composite retained the high catalytic activity after 5 runs. Visible light irradiation can obviously promote the phenol oxidation performance and the decomposition of H2O2 due to the increased production amount of HO· than that in dark conditions. Hydroxyl radical measurement also revealed that the synergistic effect between Fhy and MC.Graphical Abstract