Departamento de Ingeniería Química, Facultad de Química, Universidad de Barcelona, C/ Martí i Franquès, 1, 08028 Barcelona, Spain.
Departamento de Ingeniería Química, Facultad de Química, Universidad de Barcelona, C/ Martí i Franquès, 1, 08028 Barcelona, Spain.
Water Res. 2016 Jan 1;88:449-457. doi: 10.1016/j.watres.2015.10.035. Epub 2015 Oct 21.
The need for acidification in the Fenton and photo-Fenton process is often outlined as one of its major drawbacks, thus in this work the acidification of the Metoprolol (MET) is avoided by the addition of resorcinol (RES), which is used to simulate model organic matter. The experiments were carried out at natural pH (6.2) with different Fe(2+) (1, 2.5, 5, and 10 mg/L) and H2O2 (25, 50, 125 and 150 mg/L) concentrations. The performance of MET and RES degradation was assessed along the reaction time. Working with the highest concentrations (5 and 10 mg/L of ferrous iron and 125 and 150 mg/L of H2O2) more than 90% of MET and RES removals were reached within 50 and 20 min of treatment, respectively, by Fenton process. However a low mineralization was achieved in both cases, likely, due to by-products accumulation. Regarding to photo-Fenton process, within 3 min with the highest iron and hydrogen peroxide concentrations, a complete MET degradation was obtained and 95% of RES conversion was achieved. Parameters such Total Organic Carbon, Chemical Oxygen Demand, and AOS were measured. Intermediates were identified and MET degradation path was proposed in the presence of resorcinol. Finally, a comparison between Fenton and photo-Fenton processes at acid pH and at initial circumneutral pH was discussed. The positive effect of RES on Fenton and photo-Fenton systems has been confirmed, allowing the work at circumneutral pH.
芬顿和光芬顿工艺需要酸化，这通常被认为是其主要缺点之一，因此在这项工作中，通过添加间苯二酚（RES）避免了美托洛尔（MET）的酸化，RES 用于模拟模型有机物。实验在自然 pH 值（6.2）下进行，使用不同浓度的 Fe(2+)（1、2.5、5 和 10 mg/L）和 H2O2（25、50、125 和 150 mg/L）。随着反应时间的推移，评估了 MET 和 RES 降解的性能。在使用最高浓度（5 和 10 mg/L 的亚铁和 125 和 150 mg/L 的 H2O2）时，Fenton 工艺在 50 和 20 分钟内分别达到了超过 90%的 MET 和 RES 去除率，但两种情况下的矿化度都很低，可能是由于副产物的积累。对于光芬顿工艺，在最高铁和过氧化氢浓度下，3 分钟内即可完全降解 MET，同时实现了 95%的 RES 转化。测量了总有机碳、化学需氧量和 AOS 等参数。鉴定了中间体，并提出了在间苯二酚存在下 MET 的降解途径。最后，讨论了酸性 pH 值和初始近中性 pH 值下芬顿和光芬顿工艺之间的比较。已经证实 RES 对 Fenton 和光芬顿系统具有积极影响，允许在近中性 pH 值下工作。
