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Electrochemical sensor for detecting Pb < 2 + > and Hg < 2 + > as well as preparation method and application of electrochemical sensor

A detection method and electrochemical technology, applied in the fields of electrochemical variables of materials, scientific instruments, instruments, etc., can solve the problems of difficult nonlinear quantification, signal overlap, etc., and achieve the effects of good stability, fast response speed and high sensitivity

Pending Publication Date: 2021-08-27
JIANGXI AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the problem of overlapping signals or difficult non-linear quantification (Pravdov A, 2002) can only be solved with a large computational cost

Method used

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  • Electrochemical sensor for detecting Pb &lt; 2 + &gt; and Hg &lt; 2 + &gt; as well as preparation method and application of electrochemical sensor
  • Electrochemical sensor for detecting Pb &lt; 2 + &gt; and Hg &lt; 2 + &gt; as well as preparation method and application of electrochemical sensor
  • Electrochemical sensor for detecting Pb &lt; 2 + &gt; and Hg &lt; 2 + &gt; as well as preparation method and application of electrochemical sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: the preparation of biochar

[0048] Wash 100 g of Magnolia magnolia 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 carbonization was carried out at 800°C for 2 hours. The carbonized product was neutralized with 0.1 mol / L dilute hydrochloric acid, and finally centrifuged and dried to obtain BC.

Embodiment 2

[0049] Embodiment 2: the preparation of electrochemical sensor

[0050] The BC prepared in Example 1 is dispersed in water to obtain a concentration of BC solution of 0.3mg / mL, and 1.2mmol ZrCl 4 and 1.2 mmol NH 2 -H 2 BDC (2-aminoterephthalic acid), dissolved in 40mL DMF to obtain UiO-66-NH 2 precursor solution.

[0051] The surface of the GCE electrode was polished with a slurry of alumina particles with a diameter of 0.3 μm, then rinsed with ethanol and deionized water sequentially under the action of ultrasound, and finally dried in air. The pretreated electrode was immersed in BC solution, and BC / GCE was prepared by electrodeposition by IT method, with a deposition potential of 1.7V and a deposition time of 300s. Then place BC / GCE in UiO-66-NH 2 In the precursor solution, the deposition potential is -1.8V, the deposition time is 200s, and UiO-66-NH 2 / BC / GCE. UiO-66-NH 2 / BC / GCE was immersed in BC solution, and electrodeposited on UiO-66-NH by IT method 2 BC layer...

Embodiment 3

[0053] Embodiment 3: adopt electrochemical method to detect Pb 2+ and Hg 2+ concentration

[0054] Different concentrations (1000 μg·L -1 , 900μg·L -1 , 800μg·L -1 , 700μg·L -1 , 600μg·L -1 , 500μg·L -1 , 400μg·L -1 , 300μg·L -1 , 200μg·L -1 , 100μg·L -1 , 90μg·L -1 , 80μg·L -1 , 70μg·L -1 , 60μg·L -1 , 50μg·L -1 , 40μg·L -1 , 30μg·L -1 , 20μg·L -1 , 10μg·L -1 , 9μg·L -1 , 7μg·L -1 , 6μg·L -1 , 5μg·L -1 , 4μg·L -1 , 3μg·L -1 , 2μg·L -1 , 0.9μg·L -1 , 0.7μg·L -1 , 0.5μg·L -1 , 0.4μg·L -1 , 0.3μg·L -1 , 0.2μg·L -1 , 0.1μg·L -1 , 0.09μg·L -1 , 0.08μg·L -1 , 0.02μg·L -1 , 0.01μg·L -1 , 0.003μg·L -1 ) of Pb 2+ and Hg 2+ Solution is added respectively in the acetic acid buffer solution that pH is 4.5, the electrochemical sensor prepared by embodiment 2 is connected to test circuit, utilizes differential pulse stripping voltammetry to Pb 2+ and Hg 2+ Concentrations were measured as Pb 2+ and Hg 2+ The root of the concentration is the absciss...

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Abstract

The invention discloses an electrochemical sensor for detecting Pb < 2 + > and Hg < 2 + > as well as a preparation method and application thereof. Through intelligent combination of layer-by-layer (LbL) assembly and an electrochemical deposition technology, green and environment-friendly biochar (BC) with wide sources is selected to be compounded with a metal organic framework (MOFs), and a [UiO-66-NH / BC] n layer is deposited on the surface of a glassy carbon electrode to obtain [UiO-66-NH2 / BC] n / GCE, namely the electrochemical sensor. Electrochemical detection is performed on Pb < 2 + > and Hg < 2 + > in an electrolyte solution, and obtained data are analyzed through an artificial neural network. The electrochemical sensor prepared by the invention shows good detection sensitivity to the Pb < 2 + > and Hg < 2 + >; the real-time quantitative analysis of the Pb < 2 + > and Hg < 2 + > can be realized through the artificial neural network, the accuracy is higher, and in addition, the nonlinear relationship between the concentration of a detected object and current is effectively processed.

Description

technical field [0001] The invention relates to the technical field of electrochemical sensors, in particular to a method for detecting Pb 2+ and Hg 2+ The electrochemical sensor and its preparation method and application. Background technique [0002] With the advancement of industrialization and technology, heavy metal pollution has become increasingly prominent as the most common environmental problem. Heavy metal ions are mostly highly toxic and can easily enter the human body along the food chain and bioaccumulate, posing a serious threat to human health. Therefore, it is imperative to develop effective, eco-friendly, and economical methods for the trace detection of heavy metal ions. Electrochemical methods have received great attention in the detection of heavy metal ions due to their simple operation, high cost-effectiveness, and ease of outdoor detection. More importantly, electrochemical sensors can be miniaturized and intelligentized. As a key component of el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/411G01N27/48C25D9/02C25D9/04G06N3/04
CPCG01N27/308G01N27/411G01N27/48C25D9/02C25D9/04G06N3/048
Inventor 卢丽敏邹锦黄喜根余永芳陈尚钘高艳莎刘书武
Owner JIANGXI AGRICULTURAL UNIVERSITY
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