How to use EDTA-2Na in the synthesis of porous hollow copper microspheres
Release time:
2021-02-21
The full name of EDTA-2Na is disodium ethylenediaminetetraacetic acid, and its appearance is white crystalline powder. There are two CAS numbers, because many people on the Internet now confuse EDTA-2Na dihydrate with EDTA-2Na because they don't understand EDTA. And what I want to talk about today is the special application field of EDTA-2Na dihydrate.
EDTA-2Na is an efficient chelating agent, which can form stable water-soluble chelate with almost all transition metal ions, and is widely used in chemical analysis and industrial production. Ethylenediaminetetraacetic acid disodium dihydrate, the most important salt in EDTA, can chelate heavy metal ions and separate heavy metals, and is also used in detergents, liquid soaps, shampoos, pH regulators, etc. Recently, scientists have used the chelation effect of EDTA-2Na to creatively prepare a variety of ligand-modified porous hollow copper microspheres by electrodeposition.
EDTA-2Na chelates with Cu2+, and the space-limited Cu2+ is electro-reduced. EDTA anions are adsorbed on the fresh copper surface without post-treatment. The synthesized H-Cu MPs have a porous hollow structure, which is spherical and uniformly dispersed on carbon paper. At the same time, the shell is a porous structure composed of flocculated copper nanowires, with multi-level pore sizes ranging from 10 nm to 50 nm. A high-density porous shell formed by interconnected ultra-fine Cu nanowires. The electrodeposited H-Cu MPs are polycrystalline, corresponding to the two faces of face-centered cubic copper.
EDTA anion can be used as a functional group to adjust the surface electron density distribution and stabilize key intermediates, thereby changing the catalytic pathway to ethylene. The researchers found through experiments that by adding EDTA-2Na, the Faraday efficiency of ethylene increased from 23.3% at 0.82 V to 50.1% in a near neutral 0.1 M KHCO3 solution saturated with CO2, which is equivalent to doubling to reach One of the highest values of copper-based electrodeposition catalysts.
In addition, theoretical calculations show that the adsorbed EDTA anion is not only favorably affected by EDTA-2Na morphology regulation, but also forms a locally charged copper surface on the copper surface, stabilizing the transition state and dimers, and cooperating with OCCO adsorbents. To assist in stabilization, so that the catalyst has excellent catalytic performance.
Hubei Xindesheng Materials is a manufacturer specializing in the production of EDTA. Desheng has built a factory for decades and has been devoted to the development and production of blood collection tube additives. At present, the company has dozens of blood collection tube additives, of which heparin series and EDTA series are the main core products.
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