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Photoelectrochemical method for detecting silver ions

A technology of photoelectrochemistry and silver ions, applied in the field of analysis and detection, can solve the problems of increasing the complexity of the method, achieve the effects of simple operation and portability, promotion of effective separation, and simple production

Inactive Publication Date: 2014-03-12
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these methods are simpler, more sensitive, or more selective than the instrumental methods described above, these materials usually require pre-preparation and, when using DNase, the addition of an appropriate substrate, which is to some extent Adding to the complexity of these methods
Therefore, finding a simpler, more economical and more effective silver ion detection method still faces many challenges.
However, there is no report on the application of AgX or one-dimensional ZnO for photoelectric sensing.

Method used

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  • Photoelectrochemical method for detecting silver ions
  • Photoelectrochemical method for detecting silver ions
  • Photoelectrochemical method for detecting silver ions

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: a kind of photoelectrochemical method that is used for silver ion detection, this method comprises the steps: as figure 1 as shown,

[0029]The specific preparation scheme of ZnO nanorods is as follows: First, the ITO electrodes with the specifications of width × length 1 cm × 4 cm were respectively used with 1mol L -1 NaOH and 30% H 2 o 2 Washed again with acetone and ultrapure water, respectively, and then in a conventional three-electrode system, from 0.25 mmol L at 70 °C -1 Zn(NO 3 ) 2 ·6H 2 O and 0.1 mol L -1 KNO 3 The effective geometric area of ​​ITO is φ5 mm when electrodeposited in the mixed solution at -0.9 V relative to the standard silver-silver chloride electrode for 1 hour. Then, the ZnO nanorod array electrode was heat-treated at 110° C. for 0.5 hour to make the ZnO closely contact with the conductive substrate of the ITO electrode, so as to obtain the ZnO nanorod array electrode.

[0030] Layer-by-layer assembly for Ag + The s...

Embodiment 2

[0032] Embodiment 2: a kind of photoelectrochemical method that is used for silver ion detection, this method comprises the steps: as figure 1 as shown,

[0033] The specific preparation scheme of ZnO nanorods is as follows: First, the ITO electrodes with a size of 1 cm × 4 cm were respectively mixed with 1 mol L -1 NaOH and 30% H 2 o 2 Washing, and then washing with acetone and ultrapure water, ZnO nanorod array electrodeposition preparation process is as follows: In a traditional three-electrode system, from 0.5 mmol L -1 Zn(NO 3 ) 2 ·6H 2 O and 0.1 mol L -1 KNO 3 Electrodeposited at -1.0 V (the voltage is the voltage relative to the standard silver-silver chloride electrode) in the mixed solution for 2 hours, the effective geometric area of ​​ITO is φ 5 mm. The above electrode was then heat-treated at 110° C. for 1 hour to bring it into close contact with the ITO electrode substrate.

[0034] Layer-by-layer assembly for Ag + The specific protocol for detectio...

Embodiment 3

[0036] Embodiment 3: a kind of photoelectrochemical method that is used for silver ion detection, this method comprises the steps: as figure 1 as shown,

[0037] The specific preparation scheme of ZnO nanorods is as follows: First, the ITO electrodes with a size of 1 cm × 4 cm were respectively mixed with 1 mol L -1 NaOH and 30% H 2 o 2 Washing, and then washing with acetone and ultrapure water, ZnO nanorod array electrodeposition preparation process is as follows: In a traditional three-electrode system, from 1 mmol L at 90 °C -1 Zn(NO 3 ) 2 ·6H 2 O and 0.1 mol L -1 KNO 3 Electrodeposited at -0.8 V (the voltage is the voltage relative to the standard silver-silver chloride electrode) in the mixed solution for 0.5 hours, the effective geometric area of ​​ITO is φ5 mm. Then, the ZnO nanorod array electrode was heat-treated at 110° C. for 2 hours to make the ZnO closely contact with the conductive substrate of the ITO electrode, so as to obtain the ZnO nanorod array...

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Abstract

The invention discloses a photoelectrochemical method for detecting silver ions. The photoelectrochemical method comprises the following steps: firstly, preparing a ZnO nano rod array electrode by an electrochemical deposition method; then sequentially modifying PPDA (P-Phenylene Diamine) and polyC on the ZnO nano rod array electrode by a layer-by-layer assembling method; constructing an Ag<+1> photoelectrochemical sensor based on a C-Ag<+1>-C specific complexing action; after capturing Ag<+1>, generating AgBr in situ; and detecting the silver ions with the different concentrations by using a photocurrent-time method through the photoelectrochemical sensor sensibilized by in-situ generated AgBr. The photoelectrochemical method for detecting the silver ions has the advantages that the effective separation of carrier pairs can be promoted obviously by an electrochemical silver ion sensing system based on an in-situ generated AgBr nano particle enhanced ZnO nano rod array; the photocurrent value is improved by about 4.5 times. Meanwhile, the sensitivity and the sensitivity are high and the responding speed in the detection process is rapid; used materials are simple to produce and environment-friendly; the detection cost is low; the operation is simple and the carrying is convenient.

Description

technical field [0001] The invention relates to the field of analysis and detection, in particular to a photoelectrochemical method for silver ion detection. Background technique [0002] Silver is one of the common heavy metal pollutants. Symptoms of argyria include headaches, skin irritation, stomach pain, organ edema and even death. Silver ions and elemental silver are the two most common forms of silver, of which the former is undoubtedly the most toxic. This is mainly because silver ions can interact with some sulfhydryl-containing enzymes in human tissues and organs to inactivate them, thereby interfering with the metabolism of human tissues. Therefore, it is necessary to establish an effective detection method for silver ions. There are many traditional methods for detecting silver ions, such as atomic absorption spectrometry, plasma atomic emission spectrometry, plasma-mass spectrometry and other instrumental analysis methods. However, these methods are expensive ...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30
Inventor 李红波李静王伟
Owner YANCHENG INST OF TECH
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