Abstract This work aimed to degrade high-concentration p-nitrophenol (PNP) by Fenton oxidation. We studied various reaction parameters during Fenton oxidation, such as the iron dosage (as Fe2+), the initial concentration and temperature of PNP, and the dosage of hydrogen peroxide (H2O2), especially the influence of temperature on the PNP degradation rate and degree. Under the addition of the same molar ratio of H2O2/Fe2+ and H2O2 dosage according to the theoretical stoichiometry, the PNP degradation rate and the removal rate of total organic carbon (TOC) increased significantly with the increase in the initial PNP concentration. Moreover, the oxidative degradation effect was significantly affected by temperature. The increased reaction temperature not only significantly reduced the Fe2+ dosage, but also greatly promoted the removal rate of chemical oxygen demand (COD) and TOC, and improved the utilization efficiency of H2O2. For example, when the initial concentration of PNP was 4,000 mg·L−1, and the dosage of Fe2+ was 109 mg·L−1 (H2O2/Fe2+ = 200), the removal rates of COD and TOC at 85 °C reached 95% and 71% respectively. Both were higher than the 93% COD removal rate and 44% TOC removal rate when the dosage of Fe2+ was 1,092 mg·L−1 (H2O2/Fe2+ = 20) at room temperature.

中文翻译：

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Fenton氧化降解高浓度对硝基苯酚

摘要本工作旨在通过芬顿氧化降解高浓度对硝基苯酚（PNP）。我们研究了Fenton氧化过程中的各种反应参数，如铁用量（以Fe2+计）、PNP的初始浓度和温度、过氧化氢（H2O2）的用量，特别是温度对PNP降解速率和程度的影响。在按照理论化学计量添加相同摩尔比的H2O2/Fe2+和H2O2投加量的情况下，随着PNP初始浓度的增加，PNP的降解率和总有机碳（TOC）的去除率显着增加。此外，氧化降解效果受温度影响显着。提高反应温度不仅显着降低了Fe2+用量，而且大大促进了化学需氧量（COD）和TOC的去除率，提高了H2O2的利用效率。例如，当PNP初始浓度为4000 mg·L−1，Fe2+投加量为109 mg·L−1（H2O2/Fe2+ = 200）时，85 ℃时COD和TOC去除率达到95分别为 % 和 71%。室温下Fe2+投加量为1092 mg·L−1（H2O2/Fe2+=20）时，均高于93%的COD去除率和44%的TOC去除率。