大蒜废弃物负载纳米零价铁还原反应活性的定量评价研究

Quantitative Evaluation of the Activity of Nano-Zero Iron Reduction Reaction on Garlic Waste

摘要: 纳米零价铁以其高效还原性、对环境的友好性等特点，在环境污染治理领域得到了广泛应用。本研究探讨了纳米零价铁的制备方法以及比较了几种纳米级零价铁制备方法的特点。本研究还针对纳米零价铁还原活性的定量评价问题进行了探讨，提出了基于CrO₄^2-/Cr³⁺体系的分析测试方法，该方法反应灵敏、测量精确，能很好地应用于纳米零价铁还原活性的定量评价。在此基础上，我们对所制纳米零价铁在多种保存方式下还原活性的保持能力进行了对比研究，筛选确定了合适的保存介质、保存时间等条件，发现无水乙醇可作保存介质，60%无水乙醇 + 40%去离子水保存三天，反应时间一个小时，对六价铬的还原效果可与新鲜制备的样品一样。本实验研究可对纳米零价铁材料的保存和运输提供有益的借鉴和指导。本研究工作获得的基础数据对于改进现有纳米零价铁材料的制备、保存及应用方法都会有较好的借鉴意义。

Abstract: Nano-zero-valent iron has been widely used in the field of environmental pollution control due to its high efficiency of reduction and environmental friendliness. This study discusses the preparation of nano-zero-valent iron as well as the comparison of the characteristics of several nano-sized zero-valent iron preparation methods. In this study, we also aimed at the quantitative evaluation of the zero-valent iron reduction activity of nano-particles, and proposed an analytical test method based on the CrO₄^2-/Cr³⁺ system. The method is sensitive and accurate in measurement and can be applied to the quantitative determination of the zero-valent iron reduction activity evaluation. On this basis, we made a comparative study of the retention ability of the prepared nano-zero-valent iron in reducing activity under a variety of storage conditions, screening and determining the appropriate storage medium, storage time and other conditions, and it was found that anhydrous ethanol can be used as a storage medium, 60% absolute ethanol + 40% deionized water for three days, the reaction time of one hour, to keep the reduction effectiveness of freshly prepared samples. Research can provide valuable reference and guidance for the preservation and transportation of nano-zero-valent iron materials. The basic data obtained in this work will be of good reference for improving the preparation, storage and application of the existing nano-zero-valent iron materials.