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Preparation method of fluoride removal electro adsorption electrode for drinking water and fluoride removal electro adsorption electrode

An electro-adsorption, drinking water technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of low adsorption capacity, large loss of chemical adsorption capacity, large loss of adsorption capacity, etc. Low specific resistance, promoting treatment effect, and good ion selectivity

Inactive Publication Date: 2011-11-09
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 purely using graphite plates as adsorption electrodes
[0006] (2) Lack of suitable molding methods and technologies, resulting in most research and development processes staying in the laboratory and at the stage of two-dimensional plate electrodes
[0007] (3) Some formed adsorbents have poor strength and are easily broken; the adsorbent materials for drinking water defluoridation by adsorption method are generally filled in adsorption towers / tanks / columns 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 loss of chemical adsorption capacity during the composite electrode forming process is large, 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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 1. Preparation of conductive mixture

[0043] First, the multi-walled carbon nanotubes are added to the graphite and stirred and mixed to obtain a conductive material, wherein the weight ratio of the graphite and the carbon nanotubes is 9:1, and the specific surface area of ​​the multi-walled carbon nanotubes is greater than 110m 2 / g;

[0044] Then, adding the adsorbent hydrated zirconium oxyhydroxide and the conductive material into a ball mill for ball milling and mixing to evenly pass through a 100-mesh sieve to obtain a powdery conductive mixture, wherein the weight ratio of the conductive material to the hydrated zirconium oxyhydroxide is 1:19 ;

[0045] Wherein, the hydrated zirconium oxyhydroxide is prepared according to the following steps:

[0046] 1) The NaOH solution with a concentration of 6mol / l is added dropwise at a rate of 20ml / min into a volume of 30L and a concentration of 0.35mol / l of Zr(SO 4 ) 2 solution until the pH value of the solution is 7.0...

Embodiment 2

[0065] 1. Preparation of conductive mixture

[0066] First, the activated carbon fiber is added to the graphite to stir and mix well to obtain a conductive material, wherein the weight ratio of the graphite to the activated carbon fiber is 9:1, and the specific surface area of ​​the activated carbon fiber is 800-1600m 2 / g, particle size≤150μm;

[0067] Then, adding the adsorbent hydrated zirconium oxyhydroxide and the conductive material into a ball mill for ball milling and mixing to evenly pass through a 100-mesh sieve to obtain a powdery conductive mixture, wherein the weight ratio of the conductive material to the hydrated zirconium oxyhydroxide is 3:7 ;

[0068] Wherein, the hydrated zirconium oxyhydroxide is prepared according to the following steps:

[0069] 1) NaOH solution with a concentration of 3mol / l is added dropwise at a rate of 50ml / min into a volume of 30L and a concentration of 0.6mol / l of Zr(SO 4 ) 2 solution until the pH value of the solution is 7.0;

...

Embodiment 3

[0081] 1. Preparation of conductive mixture

[0082] First, the multi-walled carbon nanotubes are added to the graphite and stirred and mixed to obtain a conductive material, wherein the weight ratio of the graphite and the carbon nanotubes is 1:1, and the specific surface area of ​​the multi-walled carbon nanotubes is greater than 110m 2 / g;

[0083] Then, the adsorbent activated alumina and the conductive material are added to a ball mill for ball milling and mixing to evenly pass through a 100 mesh sieve to obtain a powdery conductive mixture, wherein the weight ratio of the conductive material to the activated alumina is 3:7, and the active The specific surface area of ​​alumina is 280-360m 2 / g, particle size≤150μm;

[0084] 2. Preparation of Electrosorption Mixture

[0085] Add the powdery conductive mixture and hot melt adhesive powder polytetrafluoroethylene (PTFE) into a ball mill and carry out ball milling and mix evenly through a 100 mesh sieve to obtain a powder...

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Abstract

The invention provides a preparation method of a fluoride removal electro adsorption electrode for drinking water and a fluoride removal electro adsorption electrode. The method comprises the following steps: (1) mixing a conductive material and an adsorbent to obtain a conductive mixture, wherein a weight ratio of the conductive material and the adsorbent is 3-55: 45-97; (2) adding hot melt adhesive into the mixture obtained in the above step to stir uniformly and obtaining an electro adsorption mixture, wherein a weight ratio of the hot melt adhesive and the conductive mixture is 5-50: 50-95; (3) adding the electro adsorption mixture into a mould, and followed by hot pressing moulding to obtain the fluoride removal electro adsorption electrode. Combined electrode prepared with the method in the invention has the advantages of strong fluoride removal and adsorption capability, high strength, no fragmentation in long-term use, small mass loss, no digestion, free of secondary pollution, safety and reliability, and is suitable for long-term usage under a condition of big change of water flow pressure.

Description

technical field [0001] The invention belongs to the technical field of adsorbent materials, and in particular relates to a method for forming adsorbent powder used for defluoridation of 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 and people in various c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/42C02F1/58H01B1/04C02F101/14
Inventor 王毅力张腾豆小敏梁文艳
Owner BEIJING FORESTRY UNIVERSITY
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