Nano titanium dioxide modification method of electric adsorption desalinization carbon electrode

A technology of nano-titanium dioxide and modification method, which is applied in the field of nano-titanium dioxide modification and surface modification of carbon electrode pores by nano-titanium dioxide. To achieve the effect of improving the electric adsorption capacity, increasing the specific surface utilization efficiency, and reducing the ion exchange effect

Active Publication Date: 2014-02-26
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the existence of groups, during the electrosorption process, the phenomenon of acid production at the anode and alkali production at the cathode will be aggravated, resulting in changes in the pH of the effluent
This has some adverse effects on the electrosorption process. For example, when dealing with high-alkaline and high-hard water, if the effluent is alkaline, it is easy to scale on the surface of the electrode or in the pores, blocking the internal pores of the electrode, thereby reducing the specific surface area of ​​the electrode. and porosity, while hindering the migration of ions to the inside of the electrode, the desalination performance of the long-term operation of the electrosorption device will gradually decline
(2) The groups on the surface of the electrode will have an ion exchange phenomenon during the electrosorption process, making some high-priced cations such as iron ions and calcium ions easily adsorbed inside the electrode and difficult to desorb. , affecting the effluent water quality
(3) The groups on the surface of the electrode make the electrode prone to electrochemical oxidation, and long-term operation affects the performance of the electrode, such as increased resistance, decreased mechanical strength, etc., resulting in a decrease in the electrode’s electrosorption capacity

Method used

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  • Nano titanium dioxide modification method of electric adsorption desalinization carbon electrode
  • Nano titanium dioxide modification method of electric adsorption desalinization carbon electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Wash the manufactured sheet-shaped electro-adsorption desalting carbon electrode with a thickness of 0.5mm and a size of 70mm×70mm with distilled water to remove the ash inside the electrode, wash it several times until the pH value is 7, and then dry it to a constant temperature. Heavy.

[0026] (2) Mix tetrabutyl titanate and ethanol at a volume ratio of 1:5 and stir vigorously (stirring on a magnetic stirrer at a speed of 500 rpm); mix concentrated nitric acid and water at a volume ratio of 1:5, Prepare nitric acid solution (stabilizer); then slowly drop the nitric acid solution into the mixed solution of tetrabutyl titanate and ethanol according to the volume ratio of concentrated nitric acid, tetrabutyl titanate, and ethanol as 1:5:25, and vigorously Stir, and continue stirring vigorously for 30 minutes after the addition of the nitric acid solution is completed, and the solution obtained at this time is nano-titanium dioxide sol.

[0027] (3) Modification tre...

Embodiment 2

[0033] (1) Wash the manufactured sheet-shaped electro-adsorption desalination carbon electrode with a thickness of 1mm and a size of 70mm×70mm with distilled water to remove the ash inside the electrode, wash it several times until the pH value is close to 7, and then dry it to a constant weight .

[0034] (2) Mix tetrabutyl titanate and glycerol at a volume ratio of 1:5 and stir vigorously (stirring on a magnetic stirrer at a speed of 300 rpm); mix concentrated nitric acid and water at a volume ratio of 1: 10. Prepare nitric acid solution (stabilizer); then slowly drop the nitric acid solution into the mixture of tetrabutyl titanate and glycerol according to the volume ratio of concentrated nitric acid, tetrabutyl titanate, and glycerol as 1:5:25. Mixed solution, and vigorously stirred, continued to stir vigorously for 30 minutes after the nitric acid solution was added dropwise, and the solution obtained at this time was nano-titanium dioxide sol.

[0035] (3) Modification ...

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Abstract

The invention relates to a nano titanium dioxide modification method of an electric adsorption desalinization carbon electrode, belonging to the field of manufacturing of main electrode components of an electric adsorption water purifier. The method comprises the following steps: pretreating a formed electrode, immersing in a nano titanium dioxide sol for some time, taking out, drying at a certain temperature, and carrying out heat treatment to form a titanium dioxide film layer on the wall surface of the interior pore canal of the electrode, thereby obtaining the modified electrode. The modified electrode can not easily generate acid or alkali in the electric adsorption desalinization process, has the advantages of high electric adsorption rate and higher specific surface utilization efficiency, and enhances the electric adsorption capacity of the carbon electrode, so that the desalinization property of the electrode is sufficiently displayed.

Description

technical field [0001] The invention relates to a nano-titanium dioxide modification method for an electro-adsorption desalination carbon electrode, in particular to using nano-titanium dioxide to modify the surface of the carbon electrode pores, and belongs to the technical field of manufacturing main electrode components of an electro-adsorption water purification device. Background technique [0002] In the field of water treatment desalination and desalination, currently representative technologies include: distillation, reverse osmosis, ion exchange, electrodialysis, freezing, etc. However, reverse osmosis desalination requires high working pressure, high energy consumption, and the reverse osmosis membrane is relatively expensive; electrodialysis process requires high working voltage, produces more gas, and high energy consumption; ion exchange method requires acid-base regeneration , It is easy to cause secondary pollution; Distillation and freezing have high energy c...

Claims

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Application Information

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IPC IPC(8): C02F1/469
Inventor 张鸿涛陈兆林吴春旭王玉双李冰
Owner TSINGHUA UNIV
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