The remediation of ozone oxidation to nitrobenzene (NB) contaminated groundwater has limitations such as low ozone solubility and poor gas transmission capacity. In this paper, we combine the ozone oxidation and the micro-nano bubbles (MNBs) and investigate the oxidation of the degradation of NB using a semi-continuous experimental approach. The experimental results show that the degradation efficiency of NB by ozone MNBs system (98.69%) is significantly higher than that of traditional ozone oxidation. The presence of MNBs significantly increase the rate of ·OH, ·O2– and 1O2 production compared to large bubbles produced by ozone aeration. This is due to OH– adsorbed at the interface will accelerate the conversion of ozone to ·OH during bubble rupture. And conversion between O3,·OH, ·O2– and 1O2。 The degradation of NB in ozone MNBs could be described by quasi-first-order kinetics. The degradation kinetics of ozone MNBs are obviously affected by the initial concentration of NB, the initial pH of the reaction system, salinity, gas species and flow rate. Oxidative degradation products (p-benzoquinone, phenol, o-nitrophenol, p-nitrophenol, aniline, acetic acid, NO3–, etc.) have been identified by GC–MS, IC, UV–Vis. They show that the degradation results from the attack of the aromatic ring and –NO2 of NB through nitrification, free radicals and O3. This research introduces a novel approach for degrading NB and offers crucial insights into the degradation of organic substances using MNBs.

中文翻译：

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臭氧微纳米气泡对硝基苯的氧化和降解


臭氧氧化成硝基苯 （NB） 污染地下水的修复存在臭氧溶解度低和气体传输能力差等局限性。在本文中，我们将臭氧氧化和微纳米气泡 （MNB） 相结合，并使用半连续实验方法研究 NB 降解的氧化过程。实验结果表明，臭氧 MNBs 系统对 NB 的降解效率 （98.69%） 显著高于传统臭氧氧化。MNB 的存在显着增加了 ·哦， ·O2 和 1O2 的产生与臭氧曝气产生的大气泡相比。这是由于 OH– 吸附在界面上会加速臭氧转化为 ·气泡破裂时的 OH。以及 O3，·哦， ·O2– 和 1O2。臭氧 MNB 中 NB 的降解可以用准一级动力学来描述。臭氧MNBs的降解动力学明显受NB初始浓度、反应体系初始pH、盐度、气体种类和流速的影响。氧化降解产物（对苯醌、苯酚、邻硝基苯酚、对硝基苯酚、苯胺、乙酸、NO3–等）已通过GC-MS、IC、UV-V法鉴定。它们表明，降解是由于芳香环和NB的-NO2通过硝化作用、自由基和O3的攻击造成的。本研究介绍了一种降解 NB 的新方法，并为使用 MNB 降解有机物质提供了重要见解。