Enhanced reductive reactivity of zero-valent iron (ZVI) for pollutant removal by natural organic matters (NOMs) under aerobic conditions: Correlation between NOM properties and ZVI activity
Enhanced reductive reactivity of zero-valent iron (ZVI) for pollutant removal by natural organic matters (NOMs) under aerobic conditions: Correlation between NOM properties and ZVI activity
复制标题
有氧条件下增强零价铁 (ZVI) 的还原反应性，用于天然有机物 (NOM) 去除污染物：NOM 特性与 ZVI 活性之间的相关性
DOI：
10.1016/j.scitotenv.2021.149812
复制
发表时间：
2022
影响因子：
9.8
通讯作者：
Yang Mu
中科院分区：
文献类型：
--
作者：
Chuan-Shu He;Rong-Rong Ding;Jia-Qi Chen;Guan-Nan Zhou;Yang Mu
虽然无处不在的天然有机物(NOM)能够在好氧条件下提高零价铁(ZVI)的性能，但人们对NOM的性质如何影响ZVI对污染物去除的反应性的了解有限。在有氧条件下，研究了腐植酸(HA)、黄腐酸(FA)、牛血清白蛋白(BSA)存在下ZVI的相应活性。结果发现，三种NOMS模型均可通过去钝化ZVI而有效地促进泛影葡胺(DTA)还原。有趣的是，NOM在ZVI表面的快速吸附最初会对亲水性DTA还原造成不明显的影响或明显的抑制，这取决于它们的疏水性。然而，随后暴露的更多具有高亲水性的活性中心产生于表面上与NOM相关的氧化铁的脱离，最终导致Fe0的消耗量增加，其能力为：HA、FA、≈和BSA，脱除动力学速率的顺序为：HA、FA和BSA。这进一步揭示了在好氧条件下决定DTA去除的两个关键因素，一是NOM的芳香度和氨基对FeO消耗的促进能力，二是NOM的疏水性最初影响ZVI表面的性质。
While ubiquitous natural organic matters (NOMs) are capable of enhancing zero-valent iron (ZVI) performance under aerobic conditions, there is limited understanding of how the properties of NOMs affect the reactivity of ZVI towards contaminants removal. Here, the corresponding activity of ZVI under aerobic conditions was investigated in the presence of humic acid (HA), fulvic acid (FA), bovine serum albumin (BSA). It was found that three models of NOMs were all effective in promoting diatrizoate (DTA) reduction via depassivating ZVI. Interestingly, fast adsorption of NOM onto ZVI surface initially caused inconspicuous impact or visible inhibition on hydrophilic DTA reduction depending on their hydrophobicity. However, subsequent exposure of more reactive sites with high hydrophilicity arising from the detachment of surfaced NOM-associated iron oxide finally contributed to the enhanced consumption of Fe0with the ability: HA > FA ≈ BSA, and 1-2 times increase in DTA removal kinetic rate following the order: HA > FA > BSA. It further revealed that there were two key factors in determining DTA removal under aerobic conditions, including the ability of NOMs to boost Fe0consumption as contributed by their aromaticity degree and amino groups, and the hydrophobicity of NOMs to initially affect the property of ZVI surfaces.