College of Chemical Engineering, Nanjing Tech University, Nanjing 211800, China E-mail:
Water Sci Technol. 2020 May;81(10):2260-2269. doi: 10.2166/wst.2020.284.
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 Fe), the initial concentration and temperature of PNP, and the dosage of hydrogen peroxide (HO), especially the influence of temperature on the PNP degradation rate and degree. Under the addition of the same molar ratio of HO/Fe and HO 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 Fe dosage, but also greatly promoted the removal rate of chemical oxygen demand (COD) and TOC, and improved the utilization efficiency of HO. For example, when the initial concentration of PNP was 4,000 mg·L, and the dosage of Fe was 109 mg·L (HO/Fe = 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 Fe was 1,092 mg·L (HO/Fe = 20) at room temperature.
本工作旨在通过芬顿氧化法降解高浓度对硝基苯酚（PNP）。我们研究了芬顿氧化过程中的各种反应参数，如铁剂量（以 Fe 计）、PNP 的初始浓度和温度、过氧化氢（HO）的剂量，特别是温度对 PNP 降解速率和程度的影响。在添加相同摩尔比的 HO/Fe 和根据理论化学计量比添加 HO 剂量的情况下，随着初始 PNP 浓度的增加，PNP 降解速率和总有机碳（TOC）的去除率显著提高。此外，氧化降解效果受温度的显著影响。升高反应温度不仅显著降低了 Fe 剂量，而且极大地促进了化学需氧量（COD）和 TOC 的去除率，并提高了 HO 的利用效率。例如，当 PNP 的初始浓度为 4000mg·L，Fe 的剂量为 109mg·L（HO/Fe=200）时，85°C 下 COD 和 TOC 的去除率分别达到 95%和 71%。这两个值均高于室温下 Fe 剂量为 1092mg·L（HO/Fe=20）时的 93%COD 去除率和 44%TOC 去除率。
