System for preparing nano zero-valent iron through reverse filtration in non-open inert atmosphere

Abstract

The invention discloses a system for preparing nano zero-valent iron through reverse filtration 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, wherein the main reaction device is a three-mouth flask, the condensing device comprises a condensing pipe and a cold source, the waste liquid collecting device is a waste liquid collecting bottle, three mouths of the three-mouth flask are respectively provided with a No.1 three-way valve, a single-hole rubber plug and a No.2 three-way valve, a liquid taking pipe penetrates through the single-hole rubber plug, the top end of the liquid taking pipe is connected with one end of the condensing pipe, and a filter head is fixedly arranged at the bottom end of the liquid taking pipe; the pumping pressure adjusting device comprises a No.3 three-way valve and a vacuum pump, the liquid sealing device comprises a second liquid sealing bottle connected with the waste liquid collecting bottle through a first connecting pipe, and 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 No.3 three-way valve. According to the system, 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 preparing nanometer zero-valent iron by reverse filtration under 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 use...

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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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