Method for preparing Fe-Ni nano-particles stably modified by polyethylene glycol and application of Fe-Ni nano-particles in dechlorination aspect

Abstract

The invention discloses a method for preparing Fe-Ni nano-particles stably modified by polyethylene glycol and application of the Fe-Ni nano-particles in water dechlorination aspect. The method comprises the following steps that 1), under the protection of inert gas, soluble iron salt is dissolved in a polyethylene glycol aqueous solution to obtain a mixed solution; 2), under continuous inert gas protection, a potassium borohydride aqueous solution is added into the mixed solution for reaction to obtain polyethylene glycol stabilized nanoscale zero-valent iron particles; and 3), a nickel chloride aqueous solution is prepared, specifically, the nanoscale zero-valent iron particles obtained in the step 2) are sufficiently washed with ultrapure water and absolute ethyl alcohol and then ultrasonically dispersed in absolute ethyl alcohol again, argon is introduced for oxygen removal, the nickel chloride aqueous solution is dropwise added in the argon protection atmosphere, and the polyethylene glycol stabilized Fe-Ni nano-particles are obtained after sufficient reaction. The Fe-Ni nano-particles prepared by the method are small and uniform in particle size and high in dechlorination activity.

Description

technical field [0001] The invention relates to the field of preparation of nano-materials, in particular to a method for preparing polyethylene glycol-stabilized modified Fe-Ni nanoparticles and its application in dechlorination. Background technique [0002] Chlorinated hydrocarbons are mainly derived from chemical processes. As an important chemical reagent, chlorinated hydrocarbons are widely used in solvents, extractants, refrigerants and adhesives. Omissions in storage, transportation and other links are likely to cause leakage. At present, chlorinated hydrocarbons generally exist in the environment, and they are a kind of active and diverse environmental pollutants. Chlorinated hydrocarbons are easy to accumulate in organisms, causing carcinogenic, teratogenic, and mutagenic "three effects", and can exist stably in water for a long time, and are difficult to be naturally biodegraded. Therefore, chlorinated hydrocarbons are harmful to the environment and organisms. H...

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Problems solved by technology

[0006] 2) Nano zero-valent iron is magnetic, which intensifies particle agglomeration;

[0007] 3) Nano zero-valent iron is easily oxidized, and a dense oxide film is formed on the surface to reduce its reactivity

However, common stabilizers (such as carboxymethyl cellulose) cannot effectively stabilize nano-zero-valent iron under alkaline conditions, and iron ions produced by oxidation form precipitates and deposit on the surface of nanoparticles, reducing their activity.

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