Ministry of Education of Key Laboratory of Energy Thermal Conversion and Control, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
Chemosphere. 2020 Mar;243:125322. doi: 10.1016/j.chemosphere.2019.125322. Epub 2019 Nov 8.
The porous α-FeO microspheres (MS-FeO) were obtained through in-situ ion exchange-calcination method and then utilized to activate persulfate (PS) for Rhodamine B (Rh B) degradation. The influences of some important operational parameters were investigated for the MS-FeO/PS system. Additionally, the physicochemical properties of the as-fabricated MS-FeO were revealed with the assistance of some analytical instruments (i.e., X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectra (XPS), Brunauer-Emmett-Teller (BET) and vibrating sample magnetometer (VSM)). The results showed that the physicochemical properties of MS-FeO played an important role in the activation of PS, which promoted MS-FeO to effectively induce PS to generate reactive oxidizing species, thus Rh B could be nearly 100% degraded within 30 min under near-neutral pH solution. Noticeably, the as-prepared MS-FeO revealed magnetism and could be separated conveniently through external magnetic, which was beneficial to reuse the catalyst. Finally, the reactive oxidizing species (SO and OH) participating in the oxidation process were illustrated by electron paramagnetic resonance (EPR) and radical quenching studies, and then a rational mechanism was proposed to better understand the catalytic oxidation degradation of organic pollutants.
多孔 α-FeO 微球（MS-FeO）通过原位离子交换-煅烧法获得，然后用于激活过硫酸盐（PS）以降解罗丹明 B（Rh B）。研究了 MS-FeO/PS 体系中一些重要操作参数的影响。此外，通过一些分析仪器（即 X 射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X 射线光电子能谱（XPS）、BET 和振动样品磁强计（VSM））揭示了所制备的 MS-FeO 的物理化学性质。结果表明，MS-FeO 的物理化学性质在 PS 的活化中起着重要作用，促进了 MS-FeO 有效地诱导 PS 产生活性氧化物种，从而在近中性 pH 溶液中，Rh B 可在 30 min 内几乎 100%降解。值得注意的是，所制备的 MS-FeO 具有磁性，可通过外部磁场方便地分离，有利于催化剂的重复使用。最后，通过电子顺磁共振（EPR）和自由基猝灭研究说明了参与氧化过程的活性氧化物种（SO 和 OH），并提出了一个合理的机制来更好地理解有机污染物的催化氧化降解。
