Preparation method of fluoride removal electric adsorption lanthanum-loaded electrode for drinking water and fluoride removal electrode

Abstract

The invention provides a preparation method of a fluoride removal electric adsorption lanthanum-loaded electrode for drinking water and a fluoride removal electric adsorption electrode prepared by the method. The method comprises the steps of (1) loading lanthanum into a carbon aerogel material to prepare a conductive adsorbent, wherein the weight part ratio of lanthanum to the carbon aerogel material is (5-60):(40-95); (2) adding a hot melt adhesive into the lanthanum-loaded carbon aerogel material prepared in the step (1), and mixing uniformly to prepare an electric adsorption mixture, wherein the weight part ratio of the hot melt adhesive to the lanthanum-loaded carbon aerogel material is (10-40):(60-90); (3) putting the electric adsorption mixture into a mold, and performing hot press molding. The composite electrode prepared by the method provided by the invention is strong in fluoride removal adsorptivity and high in strength, can not be broken after long-term use, is small in mass loss without dissolution and the problem of secondary pollution, is safe and reliable, and is suitable for long-term use under the condition with large water flow pressure changes.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a method for forming a lanthanum-loaded adsorbent powder used for removing fluoride from drinking water. Background technique [0002] Fluorine is an indispensable and critical element that cannot be taken too much by the human body. An appropriate amount of fluorine (0.5-1.0mg / L) can enhance the firmness of bones and have a certain effect on preventing dental caries. However, the content of fluoride ions in drinking water exceeds a certain level. The concentration will cause damage to human health, leading to fluorosis, manifested as brittle dentin, defect or loss, waist and leg pain, bone and joint fixation, deformity, etc., and can also cause thyroid dysfunction and renal dysfunction. [0003] High fluoride water is widely distributed in the world, and the health problems caused by drinking high fluoride water have attracted the attention of governments...

AI Technical Summary

Problems solved by technology

[0005] (1) The lack of innovation in electrode materials has resulted in most electro-adsorption staying at the stage of simply using graphite plates as adsorption electrodes

[0006] (2) Lack of suitable molding methods and technologies, resulting in most of the research and development process staying in the laboratory stage

[0007] (3) Some formed adsorbents have poor strength and are easily broken; the adsorbent materials for defluoridation of drinking water by adsorption method are generally filled in adsorption towers / tanks / columns for use after molding

However, due to the self-weight of the adsorption bed, the hydrostatic pressure, the kinetic energy of the water in the treatment process, and the instantaneous high-speed water flow function during the recoil process, the adsorbent particles may be broken. On the one hand, it will cause the loss of the adsorbent, and the system cannot operate effectively for a long time; The turbidity of the internal effluent increases, and the dissolution and release of chemical elements lead to potential drinking water safety hazards

[0008] (4) Some molding processes and molding materials contain harmful substances, which cannot guarantee the safety of drinking water

[0009] (5) The chemical adsorption capacity loss is large during the composite electrode forming process, resulting in insignificant electroacceleration effect

[0010] The currently used drinking water defluorination electro-adsorption electrodes have small specific capacitance; low adsorption capacity; large loss of adsorption capacity during the preparation process, poor strength of the finished fluoride-removal adsorption electrodes, easy to break, easy to swell, many leachates, and the effluent after treatment Poor safety, not suitable for long-term continuous operation