Electrochemical heavy metal detector constructed based on graphene test paper electrode and detection method thereof

An electrochemical and graphene technology, which can be applied in the fields of material electrochemical variables, scientific instruments, metal pattern materials, etc., and can solve the problems of sensitivity and portability.

Pending Publication Date: 2018-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing electrochemical detection instruments for heavy metals are usually connected to three electrodes through an electrochemical workstation. The electrodes generally use column electrodes, which have defects in detection sensitivity and portability. Therefore, a set of electroch

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  • Electrochemical heavy metal detector constructed based on graphene test paper electrode and detection method thereof
  • Electrochemical heavy metal detector constructed based on graphene test paper electrode and detection method thereof
  • Electrochemical heavy metal detector constructed based on graphene test paper electrode and detection method thereof

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Embodiment 1

[0070] A preparation method of graphene oxide, using chemical oxidation-ultrasonic stripping-chemical reduction method to prepare graphene oxide, and studying the influence of reaction conditions on the quality of synthesized graphene oxide. : We combine some technical improvements on the basis of the Hummers method to prepare graphene oxide. Preparation method The reaction can be divided into three stages, namely: low temperature stage (the temperature is kept in the range of 10~15°C), medium temperature stage (the temperature is kept in the range of 32~38°C) and high temperature stage (the temperature is kept in the range of 98 ℃). Specific steps are as follows:

[0071] Low-temperature stage: First, 230 ml of concentrated sulfuric acid was carefully added to a 2-liter round-bottomed flask, and the round-bottomed flask was cooled to 0° C. in an ice-water bath. A mixture of 10 grams of natural graphite powder and 5 grams of sodium nitrate was then added with rapid stirring....

Embodiment 2

[0088] A method for preparing graphene printed paper electrodes, the principle of which is to use graphene precursor materials—graphene oxide (GO) nanosheets as raw materials to develop a large-scale assembly process for graphene macroscopic materials, relying on GO With its own unique surface functional groups and chemical properties, in the presence of the chemical reducing agent dopamine and under hydrothermal conditions, the reduced GO sheets are stacked and connected to each other, and the GO nanosheets are used as structural units to construct a macroscopic three-dimensional porous graphene assembly. body. The three-dimensional porous graphene assembly not only inherits the excellent properties of two-dimensional graphene nanomaterials such as high electrical conductivity, chemical / thermal stability, and mechanical strength, but also endows it with a unique micro-nanoporous structure and macroscopic structure through its three-dimensional assembly process. by exploring a...

Embodiment 3

[0098] see figure 1 , a graphene test paper electrode, which includes a PET substrate 1 (polyester film) and a working electrode 2, a counter electrode 3, a reference electrode 4, a silver conductive baseline 5 and an insulating layer 6 printed on it by a printing process; The working electrode 2 is printed graphene, the counter electrode 3 is printed carbon, and the reference electrode 4 is printed silver / silver chloride; The outer periphery and the three are not in contact with each other, the working electrode 2, the counter electrode 3 and the reference electrode 4 are respectively externally connected to the silver conductive baseline 5; the insulating layer 6 surrounds the outer periphery of the counter electrode 3 and the reference electrode 4 and forms a working area inside ; The insulating layer 6 covers the silver conductive base line 5 simultaneously ( figure 1 The continuous white squares in the middle represent the conductive path, that is, the working electrode ...

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Abstract

The invention discloses an electrochemical heavy metal detector constructed on the basis of graphene test paper electrodes and a detection method thereof. The electrochemical heavy metal detector includes an electrochemical detection system and a graphene printing paper electrode connected to an input end thereof, and the graphene test paper electrode includes PET substrate and the working electrode, counter electrode, reference electrode, silver conductive baseline and insulating layer printed on it by printing process; the working electrode is printed graphene, the counter electrode is printed carbon, and the reference electrode is printed silver/chlorine silver, and a layer of bismuth film is deposited on the surface of the working electrode; the electrochemical heavy metal detector used in the present invention tests the content of heavy metal ions in the lake water sample, and the recovery rate of 10 repeated tests is 92.5%, the RSD is less than 5%, and the test time is <15 minutes ; Detection limit<1μmol/L; Compared with the atomic absorption method, the relative deviation is <5%, so the electrochemical heavy metal detector in the present invention has higher accuracy and practicability.

Description

technical field [0001] The invention relates to the technical field of detection instruments, in particular to an electrochemical heavy metal detector constructed on the basis of graphene test paper electrodes and a detection method thereof. Background technique [0002] Due to the congenital deficiencies in equipment, cost, measurement cycle, sensitivity, etc. when the traditional method is applied in the field of environmental detection, the traditional method is greatly limited in this field. Therefore, people are looking for various methods to replace and develop traditional chemical and physical measurement methods. Electrochemical sensors have gained great popularity due to their traditional advantages in high sensitivity, short measurement period, and high reliability. For decades, it has become a research hotspot in the field of environmental detection and has been widely used. At present, the commonly used detection methods for heavy metal ions include atomic emiss...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/416H05K1/09H05K3/12
CPCH05K1/092H05K3/1216G01N27/308G01N27/416
Inventor 王巧凤孟照瑜赵俊凤韩卓
Owner CHINA PETROLEUM & CHEM CORP
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