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首页> 外文期刊>RSC Advances >New insights into the activity of a biochar supported nanoscale zerovalent iron composite and nanoscale zero valent iron under anaerobic or aerobic conditions
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New insights into the activity of a biochar supported nanoscale zerovalent iron composite and nanoscale zero valent iron under anaerobic or aerobic conditions

机译：厌氧或好氧条件下生物炭负载的纳米级零价铁复合物和纳米级零价铁的活性的新见解

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In this work, to gain insight into the mechanism of p-nitrophenol (PNP) removal using the reactivity of a biochar supported nanoscale zerovalent iron composite (nZVI/biochar) and nanoscale zero valent iron (nZVI) under anaerobic or aerobic conditions, batch experiments and models were conducted. The PNP removal rate in the more acidic solutions was higher, while it was significantly suppressed at higher pH, especially at pH 9.0. The peak value of the apparent rate constants suggests that the reactivity of nZVI/biochar could be much stronger than that of nZVI under the same aeration conditions. The modified Langmuir–Hinshelwood kinetic model could successfully describe the PNP removal process using nZVI/biochar or nZVI. The reaction constants obtained through a Langmuir–Hinshelwood mechanism under different aeration conditions followed the trend nZVI/biochar (N2) > nZVI/biochar (air) > nZVI (N2) > nZVI (air), indicating that nZVI/biochar under anaerobic conditions exhibits enhanced activity for the degradation of PNP. The nZVI/biochar under anaerobic conditions has the lowest Arrhenius activation energy of PNP degradation–adsorption, suggesting that the surface interaction of eliminating PNP has a low energy barrier. In addition, TOC removal under anaerobic conditions was negligible compared with that under the aerobic system and the total number of iron ions leaching at solution pH 3.0 in the nZVI/biochar or nZVI system under air aeration conditions was much higher than that under nitrogen aeration conditions. The profiles of the intermediates formed during the PNP degradation indicated that in the anaerobic environment, reduction was the predominant step in the removal process, while the degradation of PNP could be regarded as a combination of oxidation and reduction in an aerobic environment.
机译：在这项工作中，使用在以下条件下生物炭负载的纳米级零价铁复合物（nZVI / biochar）和纳米级零价铁（nZVI）的反应性，以了解 p -硝基苯酚（PNP）的去除机理。在厌氧或有氧条件下，进行了批处理实验和模型。在酸性较高的溶液中，PNP去除率较高，而在较高的pH值（尤其是在pH 9.0）下，PNP的去除率受到明显​​抑制。表观速率常数的峰值表明，在相同的曝气条件下，nZVI /生物炭的反应性可能比nZVI的反应性强得多。修改后的Langmuir-Hinshelwood动力学模型可以成功地描述使用nZVI / biochar或nZVI去除PNP的过程。在不同曝气条件下，通过Langmuir-Hinshelwood机理获得的反应常数遵循nZVI /生物炭（N 2 ）> nZVI /生物炭（空气）> nZVI（N < small> 2 ）> nZVI（空气），表明nZVI /生物炭在厌氧条件下表现出增强的PNP降解活性。厌氧条件下的nZVI /生物炭具有最低的PNP降解-吸附Arrhenius活化能，这表明消除PNP的表面相互作用具有较低的能垒。此外，与好氧系统相比，厌氧条件下的TOC去除率可以忽略不计，并且在空气曝气条件下，nZVI /生物炭或nZVI系统在pH 3.0溶液中浸出的铁离子总数远高于氮气曝气条件下。 。在PNP降解过程中形成的中间体的分布情况表明，在厌氧环境中，还原是去除过程中的主要步骤，而PNP的降解可被视为有氧环境中氧化和还原的结合。

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