I have tried washing with anhydrous ethanol and vacuum drying, but nano zero valent iron will oxidize
郑李 冠南 Without glove boxes or freeze-drying equipment, take the following actions to preserve nanoscale zero-valent iron (nZVI): Store in an inert gas environment, seal tightly, use inert liquids like kerosene or mineral oil, work with smaller batches, add reducing agents, vacuum dry, quickly dry using desiccants, control temperature, and store in a dark environment.
Preparation and storage of nZVI without a glove box requires sacrificing some activity of the particles. It is usually possible to continue stirring under nitrogen for a few hours after the liquid phase reduction is complete to allow a layer of iron hydroxide to form on the surface of nZVI, which causes a slight loss of reducing properties. During the drying process nZVI will be relatively stable and the particles usually do not turn yellow. This is followed by drying in a vacuum oven and sealing in a container under nitrogen atmosphere. After subsequent use, the container needs to be replenished with nitrogen again to maintain its activity.
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