Method for removing ammonia nitrogen in water through TiO2-NTs/Sb-SnO2/PbO2 electrocatalytic oxidation and application of method

An electrocatalytic oxidation and water removal technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., can solve the problems of different technical difficulties and large differences, avoid accumulation and improve stability The effect of reducing the content of total nitrogen

Pending Publication Date: 2021-10-19
HUAQIAO UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the removal of ammonia nitrogen in low concentration ammonia nitrogen and chloride ion water is quite different from the removal of ammonia nitrogen in high concentration ammonia nitrogen and chloride ion water, and the technical difficulties are different.

Method used

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  • Method for removing ammonia nitrogen in water through TiO2-NTs/Sb-SnO2/PbO2 electrocatalytic oxidation and application of method
  • Method for removing ammonia nitrogen in water through TiO2-NTs/Sb-SnO2/PbO2 electrocatalytic oxidation and application of method
  • Method for removing ammonia nitrogen in water through TiO2-NTs/Sb-SnO2/PbO2 electrocatalytic oxidation and application of method

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preparation example Construction

[0035] S1. Preparation of Ti matrix: Mechanically polish the Ti matrix with sandpaper until it is smooth without traces, and then ultrasonically treat it in acetone, absolute ethanol, and deionized water for 5 to 15 minutes, wherein the acetone, the absolute ethanol, and Before the ultrasonic treatment of the deionized water, the Ti substrate needs to be cleaned with deionized water.

[0036] Further, in a preferred embodiment of the present invention, the size of the Ti substrate is 1.5-2.5 cm×1.5-2.5 cm×0.4-0.6 cm. Preferably, the size of the Ti substrate is 2cm×2cm×0.5cm. The steps of mechanical polishing with sandpaper are as follows: first use 750-850 mesh sandpaper to polish the Ti substrate until it is smooth without traces, and then use 350-450 mesh sandpaper to polish the Ti substrate until it is smooth without traces. Preferably, 800-mesh and 400-mesh sandpaper are selected to successively polish the Ti substrate.

[0037] S2,TiO 2 -Preparation of the bottom layer...

Embodiment 1

[0047] A kind of TiO provided by this embodiment 2 -NTs / Sb-SnO 2 / PbO 2 Electrode, which is prepared by the following method:

[0048] (1) Cut the titanium foil into thin slices with a specification of 2cm×2cm×0.5cm, and sand it successively with 800-mesh and 400-mesh sandpaper to remove oxides on the surface of the titanium foil. Then, at room temperature, the titanium foil was ultrasonically cleaned with acetone, absolute ethanol, and deionized water for 10 min, respectively. The titanium foil must be washed with deionized water between each step, and finally stored in absolute ethanol.

[0049] (2) The titanium foil pretreated in step (1) is used as the anode, the platinum wire is used as the cathode, and ethylene glycol, NH 4 F aqueous solution was used as the electrolyte for anodic oxidation at a voltage of 60V for 1h. After the anodic oxidation was finished, it was washed three times with deionized water, placed in a muffle furnace, and calcined at a high temperatur...

Embodiment 2

[0054] A kind of TiO that utilizes above-mentioned preparation is provided in the present embodiment 2 -NTs / Sb-SnO 2 / PbO 2 The method for removing ammonia nitrogen in water by electrode electrocatalytic oxidation comprises the following steps:

[0055] The TiO that embodiment 1 makes 2 -NTs / Sb-SnO 2 / PbO 2 As the anode and the titanium sheet as the cathode, configure the target solution NH 4 Cl, and introduce 1000mg / L of Cl - , adjust the water temperature to 25°C, and control the current density to 10mA / cm 2 , and the electrocatalytic oxidation reaction was carried out under the condition of pH=7. Liquid samples were taken from the reactor periodically. Among them, in the target solution NH 4 In Cl, the initial ammonia nitrogen concentration is 30mg / L.

[0056] The ammonia nitrogen value and total nitrogen value of the samples were tested by Nessler's reagent ultraviolet spectrophotometry and alkaline potassium persulfate ultraviolet spectrophotometry, respectively...

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Abstract

The invention provides a method for removing ammonia nitrogen in water through TiO2-NTs / Sb-SnO2 / PbO2 electrocatalytic oxidation and an application of the method. According to the method, TiO2-NTs / Sb-SnO2 / PbO2 is taken as an anode, a titanium sheet is taken as a cathode, an ammonia nitrogen target solution is introduced, Cl<-> is added, and then an electrocatalytic oxidation reaction is carried out. In the ammonia nitrogen target solution, the concentration of ammonia nitrogen is 20-40 ppm, and the concentration of Cl<-> is 1000-1500 mg / L. The TiO2-NTs / Sb-SnO2 / PbO2 electrode has relatively high chlorine evolution efficiency, and Cl<-> can be oxidized on the surface of the TiO2-NTs / Sb-SnO2 / PbO2 anode to obtain chlorine free radicals, hypochlorous acid and the like, so that most ammonia nitrogen can be converted into gaseous nitrogen, the content of total nitrogen in water is effectively reduced, the accumulation of NO3<-> is avoided, and the secondary pollution of a water body is further eliminated. The method for removing ammonia nitrogen through electrocatalytic oxidation is wide in reaction pH range and can be directly used for removing ammonia nitrogen in most natural water bodies and sewage, and the pH value does not need to be adjusted.

Description

technical field [0001] The invention relates to the technical field of water treatment, and in particular to a 2 -NTs / Sb-SnO 2 / PbO 2 Method and application of electrocatalytic oxidation to remove ammonia nitrogen in water. Background technique [0002] Ammonia nitrogen (NH 3 -N) with free ammonia (NH 3 ) or ammonium salt (NH 4 + ) exists in water, mainly from the decomposition and coking of nitrogen-containing organic matter in domestic sewage, industrial wastewater such as synthetic ammonia, and farmland drainage. Due to the many pollution sources of ammonia nitrogen, the discharge volume is large and the discharge concentration range is wide, so it is difficult to remove. Excessive ammonia nitrogen content in water can easily lead to low dissolved oxygen content in water, resulting in eutrophication of water and black and odorous water, which will cause serious harm to aquatic plants, animals and our urban water environment. [0003] my country's "Water Ten Measur...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/16
CPCC02F1/4672C02F1/725C02F2101/16
Inventor 苑宝玲刘剑桥付明来张志勇艾慧颖
Owner HUAQIAO UNIVERSITY
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