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Metal modified active carbon fiber electrode and method for removing nitrate thereby

A technology of activated carbon fiber and nitrate, which is applied in the direction of chemical instruments and methods, electrodes, electrolytic components, etc., can solve the problems of high price and difficult practical application, achieve fast response speed, low operation and management requirements, and avoid secondary pollution Effect

Active Publication Date: 2006-06-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Gold electrodes; or surface-modified noble metal electrodes, which are expensive and difficult for practical application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, dissolve 0.04619g of palladium chloride in an appropriate amount of hydrochloric acid solution, and use the isovolumic impregnation method to immerse 0.554g of activated carbon fibers in the above-mentioned palladium chloride hydrochloric acid solution, stir periodically, dry at 105°C for 12 hours, and then Calcined at 500°C for 2 hours under air protection; after cooling to room temperature naturally, then dipped in an appropriate amount of tin chloride hydrochloric acid solution to make Sn / ACF = 1.25% (weight ratio), periodically stirred, and dried at 105°C for 12 Hours, and then calcined at 500°C for 2 hours under the protection of argon; after natural cooling to room temperature, hydrogen was used as a reducing agent to reduce at 200°C for 2 hours to obtain a metal-modified activated carbon fiber electrode.

[0018] Use this electrode as the cathode to reduce nitrate in water, the effective volume of the cathode area is 400mL, and the electrode area is 36cm 2...

example 2

[0020] The electrode preparation and the method of using the electrode to remove nitrate in water are as in Example 1, except that Sn / ACF=2.5% (weight ratio). The initial concentration of nitrate in the cathode area was 110 mg / L, and the initial pH was 7.6. After 240 minutes of reaction, the concentration of nitrate was 8.37 mg / L, the concentration of nitrite was 3.1 mg / L, and the concentration of ammonium ion was 8.6 mg / L.

example 3

[0022] The electrode preparation and the method of using the electrode to remove nitrate in water are as in Example 1. The initial concentration of nitrate in the cathode area was 113 mg / L, and the initial pH was 5.1. After 240 minutes of reaction, the concentration of nitrate was 1.13 mg / L, the concentration of nitrite was 0.1 mg / L, and the concentration of ammonium ion was 4.9 mg / L.

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PUM

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Abstract

The invention, belonging to water treatment technical field, discloses the electric pole used for removing nitrate in water. The invention uses one of noble metals (palladium, platinum, gold, rhodium, and ruthenium) and one of non noble metals (copper, tin, indium, zinc and silver) to modify the activated carbon fiber and make the electric pole. The method uses the said electric pole as negative pole, and uses graphite and lead oxide as anode, deoxidizing the nitrate at the condition of energisation. The electric pole is cheap and high activity, and the invention is simple operation, convenient management and suits for small-scale decentralized feedwater treatment.

Description

field of invention [0001] The invention relates to an electrode for removing nitrate in water and a method for using the electrode to remove nitrate in water, in particular to a metal-modified activated carbon fiber electrode, which reduces nitrate in water when electrified, and belongs to water treatment technology field of application. Background of the invention [0002] Due to the extensive use of agricultural chemical fertilizers and the massive discharge of urban sewage and industrial wastewater, the global nitrate nitrogen pollution of groundwater is showing a worsening trend. At present, groundwater used as drinking water sources in most areas of my country has been polluted by nitrate to varying degrees, and the concentration in some areas has exceeded 100mg-N / L. Excessive intake of nitrates has many hazards to human health, can cause methemoglobinemia, and can lead to hypoxia death in severe cases. The amine nitrite formed during the conversion of nitrate also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/08C02F1/461
Inventor 曲久辉王颖武荣成刘会娟雷鹏举
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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