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首页> 外文期刊>Separation and Purification Technology >Kinetic modeling and efficiency of sulfate radical-based oxidation to remove p-nitroaniline from wastewater by persulfate/Fe3O4 nanoparticles process
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Kinetic modeling and efficiency of sulfate radical-based oxidation to remove p-nitroaniline from wastewater by persulfate/Fe3O4 nanoparticles process

机译：过硫酸盐/ Fe3O4纳米颗粒工艺基于硫酸根自由基氧化去除废水中对硝基苯胺的动力学模型和效率

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摘要

Iron oxide magnetic nanoparticles (MNPs) can effectively activate persulfate, generating free sulfate radicals (SO4-.), thereby presenting a promising technology for degradation of recalcitrant organic contaminants, such as p-nitroaniline (PNA), in wastewater. MNPs were prepared through liquid-phase co-precipitation method and characterized using transmission electron microscopy (TEM) and X-ray diffraction (XRD) for their shape and structure. The target contaminant PNA can be destroyed by sulfate radicals (SO4-.) depending on several parameters such as persulfate, Fe3O4, PNA concentrations, pH and reaction temperature. The results show that the degradation of PNA follows the pseudo-first-order kinetics. Approximately 100% removal efficiency of PNA was reached within 270 min, and the mineralization rate reached 67% after 300 min of reaction time. Moreover, the Fe3O4 MNP catalysts could be reused for four times. The degradation efficiency decreased because after the reaction with persulfate, Fe(II) on the surface of Fe3O4 was gradually converted to Fe(III), as determined through X-ray photoelectron spectroscopy (XPS). Based on the rate constants at different temperatures, the activation energy of this process was calculated as 65.6 kJ mol(-1). (C) 2015 Elsevier B.V. All rights reserved.
机译：氧化铁磁性纳米粒子（MNP）可以有效地活化过硫酸盐，生成游离硫酸根（SO4-。），从而为降解废水中的难降解有机污染物，例如对硝基苯胺（PNA）提供了有希望的技术。 MNP通过液相共沉淀法制备，并通过透射电子显微镜（TEM）和X射线衍射（XRD）对其形状和结构进行了表征。目标污染物PNA可以被硫酸根（SO4-。）破坏，具体取决于几个参数，例如过硫酸盐，Fe3O4，PNA浓度，pH和反应温度。结果表明，PNA的降解遵循拟一级动力学。在270分钟内达到大约100％的PNA去除效率，并且在300分钟的反应时间后矿化率达到67％。而且，Fe3O4 MNP催化剂可以重复使用四次。降解效率降低是因为在与过硫酸盐反应后，通过X射线光电子能谱（XPS）测定，Fe3O4表面的Fe（II）逐渐转化为Fe（III）。根据不同温度下的速率常数，此过程的活化能计算为65.6 kJ mol（-1）。 （C）2015 Elsevier B.V.保留所有权利。

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