In this work, the effects of weak magnetic field (WMF) on Fe⁰ particles were detailedly investigated and the pre-magnetized Fe⁰-Fenton process was applied to the advanced treatment of citric acids wastewater. The results showed that with WMF pretreatment, the COD removal improved by 38.4%, and the H₂O₂ consumption reduced by 27.5%. As for the optimal Fe⁰ pre-magnetization conditions, the time was 30 min and the magnetic field intensity was 200 mT. Pre-magnetization had different impacts on Fe⁰ with different sizes, only the μm scale Fe⁰ exhibited the promotion in wastewater treatment. The pre-magnetized Fe⁰ particles showed good magnetism stability in over 12 h. VSM, BET, SEM, XPS were used to examine the characteristics of the Fe⁰; results showed that the Fe⁰ particles had good stability of magnetic property and different size Fe⁰ had different surface topography. For the first time, it was found that the magnetic memory impacted the energy required for the escape of electrons in depth of the surface iron atoms and resulted in decrease of background intensity in high binding energy. The potential mechanisms of WMF pre-magnetization of Fe⁰ and application in Fe⁰-H2O2 reaction were proposed, including the magnetization processing of Fe⁰ and the inequality reaction on pre-magnetized Fe⁰ particles in the Fenton process.

在这项工作中，详细研究了弱磁场（WMF）对Fe ⁰颗粒的影响，并将预磁化的Fe ⁰ -Fenton工艺应用于柠檬酸废水的深度处理。结果表明，采用WMF预处理后，COD去除率提高了38.4％，H ₂ O ₂消耗降低了27.5％。至于最佳的Fe ⁰预磁化条件，时间为30分钟，磁场强度为200 mT。预磁化对不同尺寸的Fe ^0的影响不同，只有微米级的Fe ⁰在废水处理中表现出促进作用。预磁化的Fe ⁰颗粒在超过12小时内显示出良好的磁稳定性。用VSM，BET，SEM，XPS检验了Fe ⁰的特性。结果表明，Fe ⁰颗粒具有良好的磁性能稳定性，不同粒径的Fe ⁰具有不同的表面形貌。首次发现，磁记忆影响了表面铁原子深度中电子逃逸所需的能量，并导致了高结合能中背景强度的降低。提出了Fe ⁰的WMF预磁化的潜在机理及其在Fe ⁰ -H2O2反应中的应用，包括Fe ⁰的磁化处理和预磁化Fe的不等式反应。Fenton过程中有^0个粒子。