Water Sci Technol. 2019 Nov;80(10):1996-2002. doi: 10.2166/wst.2020.027.
Nanoscale zero-valent iron (nFe) tends to aggregate, which dramatically affects its aqueous characteristics and thereby its potential in water treatment applications. Hence, the main aim of this study is to overcome such drawback of nFe by a new modification approach. Iron nanoparticles were modified by magnesium hydroxide (Mg(OH)) addition with different mass ratios in order to form a nanocomposite with superior aqueous characteristics. The optimization process of the iron-magnesium nanocomposite (nFe-Mg) was conducted through different approaches including settlement tests, morphology and crystallinity investigations and particle size estimation. The addition of Mg(OH) to nFe with a Mg/Fe coating ratio of 100% resulted in stimulated stability of the particles in aqueous suspension with around 95% enhancement in the suspension efficiency compared to that of nFe. Results showed that the average particle size and degree of crystallinity of nFe-Mg(Mg/Fe:100%) decreased by 46.7% and increased by 16.8%, respectively, comparing with that of nFe. Additionally, the iron core of the synthesized nFe was adequately protected from aqueous corrosion with lower iron oxides leachates after the optimal modification with Mg(OH). Furthermore, Mg(OH) coating resulted in a stimulated adsorption reactivity of the composite towards phosphorus (P) with around 3.13% promotion in the removal efficiency comparing to that of nFe.
纳米零价铁（nFe）容易团聚，这极大地影响了其水相特性，从而影响了其在水处理应用中的潜力。因此，本研究的主要目的是通过一种新的改性方法克服 nFe 的这种缺点。通过添加不同质量比的氢氧化镁（Mg(OH)）对铁纳米颗粒进行改性，以形成具有优越水相特性的纳米复合材料。通过不同的方法，包括沉降试验、形貌和结晶度研究以及粒径估算，对铁镁纳米复合材料（nFe-Mg）的优化过程进行了研究。将 Mg(OH)添加到 nFe 中，Mg/Fe 涂层比为 100%，导致颗粒在水悬浮液中的稳定性得到了增强，悬浮效率比 nFe 提高了约 95%。结果表明，与 nFe 相比，nFe-Mg（Mg/Fe：100%）的平均粒径和结晶度分别降低了 46.7%和提高了 16.8%。此外，经过最佳的 Mg(OH)改性后，合成的 nFe 的铁核受到了充分的保护，铁氧化物浸出物的含量降低。此外，Mg(OH)涂层对磷（P）的吸附反应活性得到了增强，去除效率比 nFe 提高了约 3.13%。
