Electrochemical sensor for detecting heavy metals and preparation method and application thereof

An electrochemical and sensor technology, applied in the field of sensors, can solve the problems of inability to monitor online, limit wide application, and low detection limit, and achieve the effects of fast production, improved electrode response, and simple process

Active Publication Date: 2014-08-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have defects such as expensive equipment, complicated operation, long detect

Method used

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  • Electrochemical sensor for detecting heavy metals and preparation method and application thereof
  • Electrochemical sensor for detecting heavy metals and preparation method and application thereof
  • Electrochemical sensor for detecting heavy metals and preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0047] Embodiment 1: electrochemical sensor and preparation method thereof

[0048] see figure 1 , an electrochemical sensor, including a glassy carbon electrode, the surface of the glassy carbon electrode is modified with a layer of ordered mesoporous carbon, a layer of polyaniline is electrodeposited on the ordered mesoporous carbon, and 2-mercapto is electrodeposited on the polyaniline Sodium ethanesulfonate.

[0049] The preparation method of the aforementioned electrochemical sensor specifically comprises the following steps:

[0050] 1. Preparation of ordered mesoporous carbon:

[0051] (1) Synthesis of mesoporous silicon template SBA-15: 8.0g block copolymer P123 is placed in hydrochloric acid solution (hydrochloric acid solution is made of 270g H 2 O and 320mL, 1.54M hydrochloric acid mixed), stirred in a 35°C water bath (water bath temperature can be 30-35°C) until the block copolymer P123 was dissolved, and then added 17g of ethyl orthosilicate dropwise The ester...

Embodiment 2

[0072] Embodiment 2: the application method of electrochemical sensor

[0073]The glassy carbon electrode of Example 1 is used as a working electrode, a saturated calomel electrode is used as a reference electrode, and a platinum electrode is used as a counter electrode to establish a three-electrode system. The electrolyte solution in the electrolytic cell of the three-electrode system is 0.1 μM of bismuth ions M, pH 4.5 acetate buffer solution (the electrolyte solution may also be 0.1M pH 3-6 acetate buffer containing 0.5-1.5 μM bismuth ions). The three-electrode system was connected to an electrochemical workstation, and the concentration of heavy metal ions in the solution to be tested was detected by differential pulse anodic stripping voltammetry.

[0074] The working process of differential pulse anode stripping voltammetry: pre-enrich the heavy metal ions in the solution to be tested on the working electrode, the pre-enrichment voltage is -1.2V, and the pre-enrichment ...

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Abstract

The invention discloses an electrochemical sensor for detecting heavy metals. The sensor comprises a glassy carbon electrode serving as a working electrode in a three-electrode system, wherein ordered mesoporous carbon is modified on the surface of the detection end of the glassy carbon electrode; polyaniline and 2-mercaptoethanesulfonate are deposited on the ordered mesoporous carbon. A preparation method comprises the following steps of dispersing the mesoporous carbon into an organic solvent to obtain a mixture, then dispensing the mixture onto the surface of the glassy carbon electrode, and depositing polyaniline and 2-mercaptoethanesulfonate on the surface by an electrochemical cyclic voltammetry to prepare the electrochemical sensor. An application step comprises the following steps: putting the reaction end of the glassy carbon electrode of the electrochemical sensor into a solution to be measured, then connecting to an electrolytic basin of the three-electrode system, and implementing the detection on the concentration of heavy metal ions by a differential pulse anodic stripping voltammetry. The electrochemical sensor for detecting the heavy metals is low in cost, easy to manufacture, high in sensitivity, low in detection lower limit, high in interference resistance, easy to apply and operate and safe and pollution-free to the environment.

Description

technical field [0001] The present invention relates to the field of sensors, in particular to an electrochemical sensor for detecting heavy metals and its preparation method and application, and further relates to an electrochemical sensor for cadmium and lead detection and its preparation method and application. Background technique [0002] With the development of industry and society, more and more heavy metals have entered people's living environment through various channels. Among these heavy metals, cadmium and lead are particularly valued. Studies have shown that cadmium and lead are harmful to the health of many organisms and can also damage ecosystems. The maximum limit of cadmium content in drinking water recommended by the World Health Organization is 3 μgL -1 , the maximum limit of lead is 10μgL -1 . At present, the main methods for the determination of trace heavy metals include atomic absorption spectrometry, atomic fluorescence spectrometry, inductively c...

Claims

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Application Information

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IPC IPC(8): G01N27/48
Inventor 汤琳陈俊曾光明竺园章毅周耀渝谢霞杨贵德张盛
Owner HUNAN UNIV
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