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A composite electrode and its preparation method and method for ammonia nitrogen detection

A composite electrode and ammonia nitrogen technology, applied in the field of electrochemical analysis, can solve the problems that the electrode material is easily affected by other interfering ions, the particles of the loaded active material are large, and the electrode material is unstable, so as to facilitate electron transmission and strong catalytic ability , the effect of easy surface modification

Active Publication Date: 2020-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, there are still many difficulties and technical obstacles in the synthesis of composite electrode materials based on titanium dioxide nanotubes, such as key problems such as large particles of loaded active materials, uneven dispersion, and unstable electrode materials; The problems in application are: the detection range of the existing ammonia nitrogen sensor is narrow, the detection limit is large, and the electrode material is easily affected by other interfering ions, etc.

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  • A composite electrode and its preparation method and method for ammonia nitrogen detection
  • A composite electrode and its preparation method and method for ammonia nitrogen detection
  • A composite electrode and its preparation method and method for ammonia nitrogen detection

Examples

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Embodiment 1

[0040] A kind of Ag / Fe for the detection of ammonia nitrogen in water body 2 o 3 / TiO 2 Composite electrode preparation method comprises the steps:

[0041] (1) Preparation of TiO 2 Nanotube Substrate Electrode Materials

[0042] Grinding: Take a piece of titanium sheet (length: width: height = 200:20:1), first use 500 mesh coarse sandpaper to polish until the surface is smooth, then use 2000 mesh fine sandpaper to polish until the surface is smooth, and set aside;

[0043] Etching: Add 1mL HF, 2MlHNO to a 10ml centrifuge tube 3 and 5mL of deionized water, stirred to form a uniform mixed acid solution, put the titanium piece polished in step 1) in the mixed acid solution, soak for 10min, then take out the titanium piece, and rinse it with deionized water;

[0044] Ultrasonic treatment: Measure 50ml of ethanol, pour it into a 100mL beaker, put the etched titanium sheet into the beaker, ultrasonicate it in an ultrasonic cleaner for 15 minutes, then take out the titanium she...

Embodiment 2

[0078] A kind of Ag / Fe for the detection of ammonia nitrogen in water body 2 o 3 / TiO 2 Composite electrode preparation method comprises the steps:

[0079] (1) Preparation of TiO 2 Nanotube Substrate Electrode Materials

[0080] Grinding: Take a piece of titanium sheet (length: width: height = 100:20:1), first use 1000 mesh fine sandpaper to polish until the surface is smooth, then use 2000 mesh coarse sandpaper to polish until the surface is smooth, and set aside;

[0081] Etching: add 1mL HF, 10mL HNO to a 20mL centrifuge tube 3 and 5mL of deionized water, stirred to prepare a uniform mixed acid solution, put the titanium piece polished in step 1) in the mixed acid solution, soak for 5min, then take out the titanium piece, rinse it with deionized water;

[0082]Ultrasonic treatment: Measure 30mL of ethanol, pour it into a 100mL beaker, put the etched titanium sheet into the beaker, ultrasonicate it in an ultrasonic cleaner for 5min, then take out the titanium sheet and...

Embodiment 3

[0100] A kind of Ag / Fe for the detection of ammonia nitrogen in water body 2 o 3 / TiO 2 Composite electrode preparation method comprises the steps:

[0101] (1) Preparation of TiO 2 Nanotube Substrate Electrode Materials

[0102] Grinding: Take a piece of titanium sheet (length: width: height = 150:20:1), first use 500 mesh fine sandpaper to polish until the surface is smooth, then use 2000 mesh sandpaper to polish until the surface is smooth, and set aside;

[0103] Etching: Add 1mL HF, 8mL HNO to a 20mL centrifuge tube 3 , 5mL of deionized water, stirred and made into a uniform mixed acid solution, the titanium piece polished in step 1) was placed in the mixed acid solution, soaked for 15min, then took out the titanium piece, and rinsed it with deionized water;

[0104] Ultrasonic treatment: Measure 80mL of ethanol, pour it into a 100mL beaker, put the etched titanium sheet into the beaker, ultrasonicate it in an ultrasonic cleaner for 20min, then take out the titanium ...

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Abstract

The invention relates to the field of electrochemical analysis and in particular to a composite electrode, a preparation method thereof and a method for detecting ammonia nitrogen content in water. The composite electrode consists of an Ag, Fe2O3, and TiO2 nanotube array. The preparation method comprises the following steps of: firstly preparing a titanium dioxide nanotube array electrode by secondary anodic oxidation in combination with subsequent calcination; further loading ferric oxide on a titanium dioxide nanotube substrate by cyclic voltammetry in combination with subsequent calcination; finally obtaining an Ag / Fe2O3 / TiO2 composite electrode by pulse electrodeposition. The method for detecting ammonia nitrogen content comprises detecting the ammonia nitrogen in water quickly and accurately with high sensitivity by using the composite electrode and an electrochemical workstation in virtue of cyclic voltammetry in a detection range of 7.9~100*10-6 mol / L. The method is not affectedby interfering ions except potassium ions, and has good selectivity, low cost, convenient operation and good practicability.

Description

technical field [0001] The invention belongs to the technical field of electrochemical analysis, and relates to a composite electrode and its preparation method and application, especially an Ag / Fe electrode 2 o 3 / TiO 2 A composite electrode, a preparation method of the composite electrode and a method for detecting ammonia nitrogen in aquaculture water. Background technique [0002] The so-called water quality ammonia nitrogen refers to the presence of NH in water 3 and NH 4 + The content of N element contained in. They widely exist in water bodies in nature and are an important source of protein synthesis in aquatic organisms. However, due to human production activities, the ammonia nitrogen content in the water is often higher than the normal level. Abnormal ammonia nitrogen content usually has a huge impact on aquatic plants, animals and microorganisms. First, due to the NH 3 Toxic, this non-ionic form of ammonia is extremely harmful to aquaculture. When the am...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00G01N27/307G01N27/48
Inventor 唐爱东胡锦清杨华明
Owner CENT SOUTH UNIV