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首页> 外文期刊>Environmental Science & Technology >Ligand-Enhanced Reactive Oxidant Generation by Nanoparticulate Zero-Valent Iron and Oxygen
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Ligand-Enhanced Reactive Oxidant Generation by Nanoparticulate Zero-Valent Iron and Oxygen

机译:纳米颗粒零价铁和氧产生配体增强的活性氧化剂

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摘要

The reaction of zero-valent iron or ferrous iron with oxygen produces reactive oxidants capable of oxidizing organic compounds. However, the oxidant yield in the absence of ligands is too low for practical applications. The addition of oxalate, nitrilotriacetic acid (NTA), or ethylenediaminetetraacetic acid (EDTA) to oxygen-containing solutions of nanoparticulate zero-valent iron (nZVI) significantly increases oxidant yield, with yields approaching their theoretical maxima near neutral pH. These ligands improve oxidant production by limiting iron precipitation and by accelerating the rates of key reactions, including ferrous iron oxidation by oxygen and hydrogen peroxide. Product yields indicate that the oxic nZVI system produces hydroxyl radical (OH") over the entire pH range in the presence of oxalate and NTA. In the presence of EDTA, probe compound oxidation is attributed to OH' under acidic conditions and a mixture of OH~· and ferryl ion (Fe[IV]) at circumneutral pH.
机译:零价铁或二价铁与氧气的反应产生了能够氧化有机化合物的反应性氧化剂。但是,在没有配体的情况下氧化剂的产率对于实际应用而言太低。将草酸盐,次氮基三乙酸(NTA)或乙二胺四乙酸(EDTA)添加到纳米级零价铁(nZVI)的含氧溶液中会显着提高氧化剂的收率,其收率接近中性pH时的理论最大值。这些配体通过限制铁的沉淀和加快关键反应的速度来改善氧化剂的产生,包括氧化亚铁被氧气和过氧化氢氧化。产品收率表明,在草酸盐和NTA存在下,含氧nZVI系统在整个pH范围内产生羟基自由基(OH“)。在EDTA存在下,探针化合物的氧化归因于酸性条件下的OH'和OH的混合物和在周围pH下的亚铁离子(Fe [IV])。

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