System for preparing nano zero-valent iron through magnetic separation in non-open inert atmosphere

Abstract

The invention discloses a system for preparing nano zero valent iron through magnetic separation in a non-open inert atmosphere. The system comprises an inert gas bottle, a gas monitoring and buffering device, a main reaction device, a condensing device, a waste liquid collecting device, a liquid sealing device and a pumping pressure adjusting device which are connected in sequence; the main reaction device is a three-neck flask; the condensing device comprises a condensing pipe and a cold source; the waste liquid collecting device is a waste liquid collecting bottle; one neck of the three-neck flask is connected with a first three-way valve, another neck is provided with a single-hole rubber plug, and the rest neck is provided with a second three-way valve; a liquid taking pipe penetratesthrough the single-hole rubber plug, the top end of the liquid taking pipe is connected with the condensing pipe; the pumping pressure adjusting device comprises a third three-way valve and a vacuumpump; and the liquid sealing device comprises a second liquid sealing bottle connected with the waste liquid collecting bottle through a first connecting pipe, one end of the first connecting pipe extends into water in the second liquid sealing bottle, and the second liquid sealing bottle is connected with the third three-way valve through a second connecting pipe. According to the system, the high-purity nano zero-valent iron can be safely and effectively produced.

Description

technical field [0001] The invention relates to the technical field of preparation of water treatment materials, in particular to a system for magnetically separating and preparing nanometer zero-valent iron in a non-open inert atmosphere. Background technique [0002] In recent years, research on the treatment of nano-zero-valent iron in environmental organic pollutants and heavy metal pollutants has been more common. Compared with ordinary iron filings, nano-sized zero-valent iron has smaller particle size and larger specific surface area, and has stronger reduction reactivity and dispersibility in polluted environments. Phase synthesis, cleaning, separation, drying. [0003] At present, most laboratories complete the above-mentioned synthesis steps of nano-ZVI in a glove box filled with inert gas, and most glove boxes will continuously carry out the water removal cycle process during operation, and the liquid-phase synthesis of nano-ZVI needs to remove Ionized water is ...

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Problems solved by technology

[0004] In order to reduce the dependence of nanometer zero-valent iron on equipment, there has been a method to realize the synthesis of nanometer zero-valent iron by continuously feeding inert gas into the reaction vessel. Although this method overcomes the dependence on the glove box, the A lot of inert gas is wasted, and the cost of the experiment is still high

There are also devices for synthesizing nano-zero-valent iron through self-made devices. Although these devices overcome the dependence on glove boxes and save experimental consumables, they do not have material cleaning steps in the process of synthesizing nano-zero-valent iron. The obtained zero-valent iron is impure, and the separation of nano-zero-valent iron needs to be carried out in an atmosphere in contact with air. The material is easily lost and the purity of the zero-valent iron content of different batches of materials will vary greatly

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