Abstract

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

中文翻译：

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三氧化二铁/介孔碳复合材料用作苯酚降解的类芬顿催化剂

摘要

氢氧化铁（Fhy）是自然环境中最广泛的铁化合物，它参与土壤和沉积物中的光化学过程和活性氧的产生。三种典型的Fhy /中孔碳（Fhy / MC）复合材料是通过70°C的水热过程制备的，其中Fhy纳米颗粒（NPs），纳米棒（NRs）和//微棒（MRs）在MC材料中结晶和/或附着在MC材料上。我们探讨了H ₂ O ₂存在下苯酚类芬顿氧化和矿化的性能在接近中性的pH值（pH = 5）下。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，将Fhy NP封装在MC骨架中的Fhy-NP / MC复合材料表现出最高的催化性能。循环测试表明，Fhy-NP / MC复合材料经过5次运行后仍保留了较高的催化活性。可见光辐照可以显着促进苯酚的氧化性能和H ₂ O ₂的分解，这是因为HO ^·的产生量比黑暗条件下增加。羟自由基的测量也揭示了Fhy和MC之间的协同作用。

图形概要