Preparation method and application of graphene/polypyrrole electrochemical sensor for trace-amount lead ion detection

A polypyrrole electrochemistry and graphene technology, applied in the field of environmental analysis, can solve the problems of general selectivity, difficult operation, expensive equipment, etc., and achieve the effects of controllable and easy operation, no secondary pollution, and low cost of the preparation method.

Inactive Publication Date: 2016-08-10
DALIAN UNIV OF TECH
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Problems solved by technology

However, these methods have some disadvantages, such as: expensive equipment, difficult operation,

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  • Preparation method and application of graphene/polypyrrole electrochemical sensor for trace-amount lead ion detection
  • Preparation method and application of graphene/polypyrrole electrochemical sensor for trace-amount lead ion detection
  • Preparation method and application of graphene/polypyrrole electrochemical sensor for trace-amount lead ion detection

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Embodiment

[0032] A graphene-polypyrrole electrochemical sensor for trace lead ion detection, the construction and detection process is as follows:

[0033] (1) Preparation of graphene oxide: graphene oxide was prepared by an improved Hummers chemical method. The steps are as follows: Take a certain amount of concentrated sulfuric acid (98%) and slowly add it to graphite powder (concentrated sulfuric acid volume: graphite powder mass = 23:1), after fully stirring, slowly add KMnO in an ice-water bath at 0°C 4 (KMnO 4 The mass ratio to graphite powder is 3:1), while fully stirring. Then the mixture was continuously ultrasonicated for 5-7 hours to obtain a dark brown solution. Slowly add high-purity water into the dark brown solution, heat and boil for 5-15 minutes, then add high-purity water and 30% hydrogen peroxide in sequence to terminate the reaction, and obtain a bright yellow graphene oxide aqueous solution. After centrifugation, wash with dilute hydrochloric acid for 2 to 3 time...

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Abstract

A preparation method and application of a graphene-polypyrrole electrochemical sensor for trace lead ion detection belong to the field of environmental analysis. The invention utilizes the complexation of the nitrogen atom on the amine group in the polypyrrole and the lead ion to obtain high selectivity and the high conductivity of the graphene nanosheet to amplify the signal and realize the detection of trace lead ions. The presence of graphene can also increase the steric binding sites of the composite material and the interfacial electron transfer rate, thereby improving the detection effect of the sensor. Due to the synergistic effect of graphene nanosheets and polyaniline, the graphene-polypyrrole electrochemical sensing method has the characteristics of high sensitivity and high selectivity. ‑The preparation method of the polypyrrole electrochemical sensor is simple and controllable, without secondary pollution. The invention has wide application prospects in in-situ monitoring of trace lead ions in water bodies.

Description

technical field [0001] The invention belongs to the field of environmental analysis, and relates to a preparation method and application of a graphene-polypyrrole electrochemical sensor used for detecting trace lead ions. Background technique [0002] As a representative heavy metal pollutant, lead ions are widely distributed in environmental water bodies. With the enrichment of the biological chain, lead ions ingested from food and drinking water accumulate in the body as people grow older. Its harm to the human body is manifested in the toxic effect on the kidneys, nervous system, blood and reproductive system, and permanent damage to human tissues and internal organs. Especially the toxic effect on children is more serious, it can impair intellectual development, suppress immune system function and sensory dysfunction and so on. Therefore, it is necessary to monitor trace lead ions in environmental water, and developing a new and simple detection method to detect trace l...

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Application Information

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IPC IPC(8): G01N27/333G01N27/32G01N27/38
CPCG01N27/333G01N27/32G01N27/38
Inventor 赵慧敏荣荣全燮陈硕于洪涛
Owner DALIAN UNIV OF TECH
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