Method for efficiently removing nitrate from underground water through Ti-graphene electrode

A graphene electrode, nitrate technology, applied in the treatment of polluted groundwater/leachate, chemical instruments and methods, water pollutants, etc. problem, to achieve the effect of easy control, simple production process, and improved electronic conductivity

Active Publication Date: 2015-12-30
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Biological denitrification is the most widely used nitrate removal method at present, but it will cause secondary pollution when it treats water with high sulfur concentration. pressure
Among the chemical methods, the catalytic reduction method can effectively convert nitrate nitrogen into nitrogen gas, but the hydrogen used in the reaction is expensive and inconvenient for storage and transportation, and its practical application is limited due to the difficulty in controlling its operating conditions

Method used

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  • Method for efficiently removing nitrate from underground water through Ti-graphene electrode
  • Method for efficiently removing nitrate from underground water through Ti-graphene electrode
  • Method for efficiently removing nitrate from underground water through Ti-graphene electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, the electrolytic tank is a cylindrical water tank, made of polyethylene material, and a DC voltage stabilizer is used as a power source. The effective voltage is 0-100V and the effective current is 0-5A.

[0042] In the experiment, synthetic nitrate polluted water (NO 3 - -N, 50mg / L; Na 2 SO 4 , 0.5g / L) 150mL into the electrolytic cell, turn on the power supply, adjust the current to make the current 0.75A. The size of the cathode and anode plates are both 10×2.5cm, and the effective area of ​​the plates is 20.0cm 2 , The anode uses Ti / Pt electrode, ①The cathode used is Ti electrode, then the nitrate nitrogen concentration will be reduced from 50.0mg / L to 43.0mg / L after 60 minutes of reaction; ②Ti- made with graphene oxide as auxiliary The graphene electrode is a cathode. The immersion time in the graphene oxide solution is 5 minutes during the production process. After 60 minutes of reaction, the nitrate nitrogen concentration will drop from 50.0...

Embodiment 2

[0044] The electrolytic cell used in the experiment and the method of using nanoelectrodes to remove nitrate are as in Example 1, except that the Ti-graphene electrode used is soaked in the graphene oxide solution for 10 minutes during the manufacturing process. In the experiment, 150mL of nitrate sewage was taken, of which NO 3 - -N, 50mg / L; Na 2 SO 4 , 0.5g / L, the size of the cathode and anode plate is 10.0×2.5cm, and the effective area of ​​the plate is 20cm 2 Under the condition of current intensity of 0.75A, ①The cathode used is a Ti electrode, and the concentration of nitrate nitrogen drops from 50.0mg / L to 44mg / L after 60 minutes of reaction; ②Ti- made with graphene oxide as an aid is used. The graphene electrode is the cathode, and the nitrate nitrogen concentration drops from 50.0mg / L to 29.1mg / L after 60 minutes of reaction. The removal rate is 240% higher than that of the Ti electrode. The result is as follows image 3 Shown.

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Abstract

A method for efficiently removing nitrate from underground water through a Ti-graphene electrode includes the following steps of adding crystalline graphite powder into a beaker, adding NaNO3, H2SO4, KMnO4, deionized water and H2O2 at the temperature of 60 DEG C into the beaker in sequence, going through the low-temperature stage, the intermediate-temperature stage and the high-temperature stage, conducting centrifuging, cooling and drying to obtain graphene oxide powder, preparing a graphene oxide solution, adding sodium dodecyl benzene sulfonate, soaking a preprocessed Ti electrode plate in the solution and then pulling the preprocessed Ti electrode plate out of the electrode plate, naturally drying the electrode plate to obtain the finished product Ti-graphene electrode, adding sodium sulfate to nitrate polluted water, setting current electrolysis with the Ti-graphene electrode as the cathode and a Ti / Pt electrode as the anode, conducting reduction to remove nitrate, and reducing nitrate to generate nitrogen, nitrite or ammonia after nitrate obtains electrons on the cathode so that the nitrate removing aim can be achieved. By means of the Ti-graphene electrode prepared with the aid of graphene oxide, nitrate is effectively removed in an electrochemical reaction tank without other auxiliary processing devices.

Description

Technical field [0001] The invention belongs to the technical field of nitrate treatment in water, and specifically relates to a method for efficiently removing nitrate in groundwater with a Ti-graphene electrode. Background technique [0002] In recent years, with the enrichment of human life and the development of society, the pollution of nitrate in water cannot be underestimated. As one of the most common non-point source pollutants, nitrate seriously affects the application of groundwater. The World Health Organization (WHO) "Drinking Water Quality Standards" and my country's "Drinking Water Hygiene Standards" both stipulate that the maximum limit of nitrate nitrogen is 10mg / L. However, in the United States, about 20% of groundwater well water and 10% of streams contain nitrates that exceed drinking water standards. Spain, the United Kingdom, Germany, France and Italy also have approximately 80%, 50%, 36%, 34% and 32% of groundwater bodies with nitrate concentrations excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F103/06C02F101/16
Inventor 李淼马雪姣王乐乐刘博刘翔
Owner TSINGHUA UNIV
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