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Electrochemical sensor for detecting ratio of Pb<2+> with high sensitivity and application of electrochemical sensor

A sensor and electrochemical technology, applied in the field of ratio electrochemical sensors for high-sensitivity detection of Pb2+, can solve the problems of increasing operational complexity, affecting the electrochemical performance of electroactive substances, and achieving improved reproducibility, reliability, and strong selectivity. , the effect of easy operation

Pending Publication Date: 2022-01-07
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This not only increases the complexity of operation, but the introduction of additional supports may also affect the electrochemical performance of electroactive materials.

Method used

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  • Electrochemical sensor for detecting ratio of Pb&lt;2+&gt; with high sensitivity and application of electrochemical sensor
  • Electrochemical sensor for detecting ratio of Pb&lt;2+&gt; with high sensitivity and application of electrochemical sensor
  • Electrochemical sensor for detecting ratio of Pb&lt;2+&gt; with high sensitivity and application of electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A highly sensitive detection of Pb 2+ The electrode surface of the ratiometric electrochemical sensor is coated with bismuth nanoparticles@activated biochar (BiNCs@AB) composite.

[0044] The preparation method of BiNCs@AB composite material includes the following steps:

[0045] 1) Wash 100 g of litsea cubeba fruit with water to remove impurities, dry it (at 80° C. for 12 hours), and grind it into powder. Next, soak the ground magnolia fruit powder in 200 g of KOH solution with a concentration of 0.1 mol / L for 1 day to activate. After the activation is completed, the activated Magnolia magnanimum fruit powder is placed in a tube furnace, and the N 2 Under the atmosphere, the temperature was raised to 800°C at a heating rate of 5°C / min, and carbonized for 2h. The carbonized product was neutralized with dilute hydrochloric acid with a concentration of 0.1 mol / L, and finally AC was obtained by centrifugal drying.

[0046] 2) 0.4g AC was dissolved in 100mL ethanol to o...

Embodiment 2

[0050] Detection of Pb 2+ concentration

[0051] Different concentrations (1000μg / L, 900μg / L, 800μg / L, 700μg / L, 600μg / L, 500μg / L, 400μg / L, 300μg / L, 200μg / L, 70μg / L, 50μg / L, 10μg / L L, 9μg / L, 7μg / L, 5μg / L, 0.9μg / L, 0.003μg / L) Pb 2+ The solution was added into the 0.1M acetate buffer solution with a pH of 5.0, the electrochemical sensor prepared in Example 1 was connected to the test circuit, and the Pb 2+ Concentrations were measured as Pb 2+ Concentration is the abscissa (unit is μg / L), with I Pb 2+ / I BiNCs As the ordinate (in μA), the standard curve I is established Pb 2+ / I BiNCs (μA)=0.0091+0.0015c(μg / L)(R 2 = 0.9917).

[0052] Such as Figure 4 Shown, the electrochemical sensor that embodiment 1 prepares is to Pb 2+ have a good linear relationship (R 2 =0.9917), and has a wide linear range (0.003μg·L -1 -1000μg·L -1 ) and high sensitivity and low detection limit (1.0ng / L), fully demonstrate that the sensing electrode can successfully detect Pb in unknown con...

Embodiment 3

[0054] Using the bare glassy carbon electrode, the glassy carbon electrode modified by BiNCs, the glassy carbon electrode modified by AB (i.e. bare GCE, BiNCs / GCE and AB / GCE) and the sensor prepared in Example 1, the Pb 2+ For detection, test different modified electrodes for Pb 2+ The detection responsivity, see the results figure 2 .

[0055] Depend on figure 2 It can be seen that the sensor prepared in Example 1 (i.e. BiNCs@AB / GCE) can detect extremely low Pb concentrations relative to BiNCs / GCE, AB / GCE and bare GCE 2+ The detection sensitivity is better than that of BiNCs and AB-modified glassy carbon electrodes.

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Abstract

The invention discloses an electrochemical sensor for detecting the ratio of Pb<2 +> as well as a preparation method and application of the electrochemical sensor. Bismuth nanoparticles (BiNCs) serve as an internal reference probe for the first time, and green and environment-friendly activated charcoal (AB) wide in source is selected as a carrier to anchor the BiNCs to construct a BiNCs-AB composite material. The Pb<2+> and BiNCs peak current ratio (IPb<2+> / IBiNCs) is taken as an output signal, the Pb<2+> is subjected to electrochemical detection in an electrolyte solution, and the interference caused by a sensing environment can be eliminated through ratio sensing. The electrochemical sensor prepared by the invention shows good detection sensitivity to Pb<2+>; according to the ratio electrochemical sensor constructed by the invention, detection reproducibility and reliability are remarkably improved, and rapid quantitative analysis of Pb<2+> is realized.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a high-sensitivity detection of Pb 2+ Ratiometric electrochemical sensors and their applications. Background technique [0002] Heavy metal ions, especially lead ions (Pb 2+ ) is listed as the most dangerous environmental pollutant due to its high toxicity and non-biodegradability. Excessive exposure to trace amounts of Pb 2+ Causes serious damage to the nervous system, kidneys, liver, reproductive system and brain. At the same time, its non-biodegradability means it can concentrate in living tissues throughout the food chain, posing a serious threat to natural ecosystems and public health. Therefore, the development of high-sensitivity, high-reliability Pb 2+ Detection technology is of great significance to human health and environmental monitoring. [0003] At present, surface-enhanced Raman scattering, atomic absorption spectroscopy (AAS), inductively cou...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 卢丽敏邹锦陈尚钘黄喜根高艳莎刘书武
Owner JIANGXI AGRICULTURAL UNIVERSITY
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