A kind of nanometer zero valent iron and its preparation method and application

Abstract

The invention belongs to the technical field of metal nanoparticles, and provides a nanometer zero-valent iron and its preparation method and application. The preparation method includes: adding a dispersant to the iron salt solution or ferrous salt solution and stirring rapidly, adding a reducing agent and tea extract at the same time; after the reducing agent is added dropwise, continue stirring until no bubbles are generated, and the nanometer zero-valent Iron suspension: black solid obtained from the nano-zero-valent iron suspension by magnetic separation, fully washed with distilled water and ethanol, centrifuged and poured into the supernatant, and the solid obtained after centrifugation was freeze-dried under vacuum conditions , to obtain nanometer zero-valent iron particles. The preparation method of nano-zero-valent iron provided by the present invention uses tea extract as an antioxidant, which greatly improves the anti-oxidation performance of nano-zero-valent iron while maintaining the high activity of nanoparticles, not only reduces environmental pollution, but also realizes waste The reuse of tea leaves increases the added value of the tea industry.

Description

technical field [0001] The invention relates to the technical field of metal nanoparticles, in particular to a nanometer zero-valent iron and its preparation method and application. Background technique [0002] At present, the development of nanotechnology has become a hot spot for researchers. Due to the small size of nanomaterials (1-100nm), they have special physical and chemical properties, such as large specific surface area (up to tens of m2 / g), High reactivity, strong soil migration ability, these properties make it have a good application prospect in the environmental field. Nano-zero-valent iron (NZVI) is a nano-material that has been studied more in recent years. Because Fe element is relatively less harmful, it has excellent treatment capacity and the ability to realize resource recovery in water treatment. [0003] However, due to the large specific surface area, high activity and strong magnetism of nano-zero-valent iron, it is very easy to agglomerate and oxi...

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Problems solved by technology

However, this scheme uses a single dispersant and antioxidant, and there is still obvious agglomeration phenomenon, resulting in poor oxidation resistance of the zero-valent iron produced, and it is still easily oxidized when exposed to air, which affects the reactivity of zero-valent iron.

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