利用 HO 太阳光解和低浓度 Fe(III)的太阳光芬顿类似工艺去除 2,4-D。
Abatement of 2,4-D by HO solar photolysis and solar photo-Fenton-like process with minute Fe(III) concentrations.
机构信息
Departamento de Ingeniería Química, Instituto Tecnológico de Buenos Aires - ITBA, Av. Eduardo Madero 399, Ciudad Autónoma de Buenos Aires, Argentina; Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Godoy Cruz, 2290 (C1425FQB), Ciudad Autónoma de Buenas Aires, Argentina.
Departamento de Ingeniería Química, Instituto Tecnológico de Buenos Aires - ITBA, Av. Eduardo Madero 399, Ciudad Autónoma de Buenos Aires, Argentina.
出版信息
Water Res. 2018 Nov 1;144:572-580. doi: 10.1016/j.watres.2018.07.072. Epub 2018 Jul 31.
The Photo-Fenton-like (PF-like) process with minute Fe(III) concentrations and the Hydrogen Peroxide Photolysis (HPP), using Xe-lamp or solar light as sources of irradiation, were efficiently applied to eliminate the herbicide 2,4-D from water. PF-like experiments concerning ferric and HO concentrations of 0.6 mg L and 20 mg L respectively, using Xenon lamps (Xe-lamps) as a source of irradiation and 2,4-D concentrations of 10 mg L at pH 3.6, exhibited complete 2,4-D degradation and 77% dissolved organic carbon (DOC) removal after 30 min and 6 h of irradiation respectively whereas HPP (in absence of ferric ions) experiments showed a 2,4-D reduction and DOC removal of 90% and 7% respectively after 6 h of irradiation. At pH 7.0, HPP process achieved a 2,4-D abatement of approximately 75% and a DOC removal of 4% after 6 h. PF-like exhibited slightly improved 2,4-D and DOC removals (80% and 12% respectively) after the same irradiation time probably due to the low pH reduction (from 7.0 to 5.6). Several chlorinated-aromatic intermediates were identified by HPLC-MS. These by-products were efficiently removed by PF at pH 3.6, whereas at neutral PF-like and acid or neutral HPP, they were not efficiently degraded. With natural solar light irradiation, 10 and 1 mg L of 2,4-D were abated using minor HO concentrations (3, 6, 10 and 20 mg L) and iron at 0.6 mg L in Milli-Q water. Similar results to Xe-lamp experiments were obtained, where solar UV-B + A light HO photolysis (HPSP) and solar photo-Fenton-like (SPF-like) played an important role and even at low HO and ferric concentrations of 3 and 0.6 mg L respectively, 2,4-D was efficiently removed at pH 3.6. Simulated surface water at pH 3.6 containing 1 mg L 2,4-D, 20 mg L HO and 0.6 mg L Fe(III) under natural sunlight irradiation efficiently removed the herbicide and its main metabolite 2,4-DCP after 30 min of treatment while at neutral pH, 40% of herbicide degradation was achieved. In the case of very low iron concentrations (0.05 mg L) at acid pH, 150 min of solar treatment was required to remove 2,4-D.
光-Fenton 样（PF-like）过程在低浓度的三价铁（Fe(III)）和过氧化氢光解（HPP）下进行，使用氙灯或太阳光源作为辐射源，可有效地用于从水中去除除草剂 2,4-D。PF-like 实验中，Fe(III)和 HO 的浓度分别为 0.6 mg/L 和 20 mg/L，使用氙灯（Xe-lamps）作为辐射源，2,4-D 的浓度为 10 mg/L，pH 值为 3.6，在 30 min 和 6 h 的照射后，分别完全降解 2,4-D 和去除 77%的溶解有机碳（DOC）；而 HPP（无铁离子）实验在 6 h 的照射后，分别去除 90%和 7%的 2,4-D 和 7%的 DOC。在 pH 值为 7.0 时，HPP 工艺在 6 h 后可去除约 75%的 2,4-D 和 4%的 DOC。PF-like 在相同的照射时间后略微提高了 2,4-D 和 DOC 的去除率（分别为 80%和 12%），可能是由于 pH 值降低（从 7.0 降至 5.6）。通过 HPLC-MS 鉴定了几种氯化芳香族中间体。这些副产物在 pH 值为 3.6 的 PF 中得到了有效去除，而在中性的 PF-like 和酸性或中性的 HPP 中则不能有效降解。使用低浓度的 HO（3、6、10 和 20 mg/L）和 0.6 mg/L 的铁在 Milli-Q 水中，利用天然太阳光照射，10 和 1 mg/L 的 2,4-D 在 3 和 6 小时时被去除。在 Xe 灯实验中得到了相似的结果，其中太阳 UV-B+A 光 HO 光解（HPSP）和太阳光-Fenton 样（SPF-like）发挥了重要作用，即使在低 HO 和铁浓度分别为 3 和 0.6 mg/L 的情况下，在 pH 值为 3.6 时，2,4-D 也能被有效去除。在含有 1 mg/L 2,4-D、20 mg/L HO 和 0.6 mg/L Fe(III)的模拟地表水在自然阳光照射下，pH 值为 3.6，在 30 分钟的处理后可有效去除除草剂及其主要代谢物 2,4-DCP，而在中性 pH 值下，仅能实现 40%的除草剂降解。在酸性 pH 值下，铁浓度非常低（0.05 mg/L）时，需要 150 分钟的太阳处理才能去除 2,4-D。
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