Defluorination carbon electrode and its preparation method

Abstract

The invention relates to the adsorption material preparation field, and concretely relates to a defluorination carbon electrode and its preparation method. Raw materials of the defluorination carbon electrode comprise a hot melt adhesive and a conductive carbon material, wherein the mass ratio of the hot melt adhesive to the conductive carbon material is 65-95:5-35; and the hot melt adhesive have types comprising an ethylene-vinyl acetate (EVA) copolymer type and / or an ethylene-vinyl alcohol (EVOH) type. The preparation method of the defluorination carbon electrode comprises the following steps: 1, uniformly mixing the conductive carbon material with the hot melt adhesive according to the above mass ratio to obtain mixed powder; and 2, putting the mixed powder into a molding die, carrying out hot press molding at a temperature of 100-180DEG C under a pressure of 10-30MPa, and carbonizing at 400-950DEG C for 2-4h. The electrode prepared in the invention has the advantages of large effective specific surface area, strong conductivity, no dissolving-out of metals or toxic organic matters, no secondary pollution after the use in the defluorination treatment of drinking water, and water safety guarantee.

Description

technical field [0001] The invention relates to the field of preparation of adsorption materials, in particular, the invention relates to a carbon electrode for removing fluorine and a preparation method thereof. Background technique [0002] Fluorine is one of the essential trace elements for the human body. Adequate intake of fluorine by the human body can strengthen the teeth and reduce the incidence of dental caries, but excessive fluorine can also affect the health of the human body. Long-term drinking of water with a fluoride concentration higher than 1.0mg / L can cause diseases such as dental fluorosis and bone fluorosis. China is one of the countries with the most serious fluorine pollution in drinking water in the world. In 2006, my country promulgated a new drinking water hygiene standard (GB5479-2006), which stipulates that the limit of fluorine in drinking water is 0.01mg / L and 1.0mg / L, and it was officially implemented on July 1, 2007. The implementation of st...

AI Technical Summary

Problems solved by technology

[0005] (1) The existing molding method generally prepares the electrode under normal temperature conditions. On the one hand, the glue blocks the surface pores of the electrode, reducing the limited specific surface area, and on the other hand increases the resistance of the electrode to conduction and mass transfer;

[0006] (2) The existing forming methods generally use conventional carbon materials such as activated carbon, acetylene black, etc. to prepare electrodes. These materials have weak electrical conductivity, and additional metal substrates need to be added, resulting in a decrease in the effective use area of ​​the electrode.

The liquid binder has weak bonding performance, and the adhesive will block the holes after forming, making the effective specific surface area of ​​the formed electrode smaller

[0008] (4) Some molding processes make the formed carbon electrode contain harmful substances, and organic matter will dissolve during use, which will affect water quality and safety