Nano-magnetite supported by biochar (nFe3O4/BC) pyrolyzed at temperatures of 300 °C-600 °C was developed to activate hydrogen peroxide (H2O2) for the efficient degradation of ethylbenzene in aqueous solution. It was revealed that the degradation efficiency of ethylbenzene and TOC removal were 96.9% and 36.2% respectively after the reaction for 40 min in the presence of initial concentration of 0.1 mmol L-1 ethylbenzene, 2.76 g L-1 nFe3O4/BC500 with the mass ratio of nFe3O4 to BC500 of 4:1 and 2.0 mmol L-1 H2O2 at pH 7.0. Based on electron paramagnetic resonance (EPR), quenching experiment and X-ray photoelectron spectroscopy (XPS) data, both OH and O2- radicals were generated in the nFe3O4/BC500 activated H2O2 system, and the OH radicals were the predominant species for the degradation of ethylbenzene. Through electron transfer process, mechanisms of Fe(II), phenolic hydroxyl group and persistent free radicals (PFRs) on BC surfaces accounted for the generation of OH radicals, and Fe(III) in nFe3O4 and formed from Fe(II) oxidation responsible for the generation of O2- radicals in the nFe3O4/BC activated H2O2 system were proposed.

中文翻译：

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生物炭负载的纳米磁铁矿在不同温度下作为过氧化氢活化剂热解：合成机理及其对乙苯去除的影响。

开发了在300°C-600°C的温度下热解的以生物炭（nFe3O4 / BC）为载体的纳米磁铁矿，以活化过氧化氢（H2O2），以有效地降解水溶液中的乙苯。结果表明，在初始浓度为0.1 mmol L-1乙苯，2.76 g L-1 nFe3O4 / BC500的初始浓度下，反应40分钟后，乙苯的降解效率和TOC去除率分别为96.9％和36.2％。在pH 7.0下，nFe3O4与BC500的比例为4：1，2.0 mmol L-1 H2O2。根据电子顺磁共振（EPR），猝灭实验和X射线光电子能谱（XPS）数据，在nFe3O4 / BC500活化的H2O2系统中会同时生成OH和O2-自由基，而OH自由基是降解的主要物质。乙苯。通过电子转移过程