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A light-enhanced electrochemical sensor and its preparation method and application

A sensor and electrochemical technology, applied in the field of sensors, can solve the problems of low accuracy and low detection limit, achieve the effect of low price, reduce cost and improve sensitivity

Active Publication Date: 2021-06-11
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method has been shown to have high accuracy and low detection limits for the detection of heavy metal ions

Method used

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  • A light-enhanced electrochemical sensor and its preparation method and application
  • A light-enhanced electrochemical sensor and its preparation method and application
  • A light-enhanced electrochemical sensor and its preparation method and application

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preparation example Construction

[0044] The carbon nitride nanosheets involved in the embodiments of the present invention are prepared by the following steps: take 5 g of melamine in a crucible, and after calcining in a muffle furnace at 550° C. for 5 hours, obtain block carbon nitride solids, and then take 50 mg of block C 3 N 4 The solid is ground into powder and dispersed in 50mL of water and ethanol mixed solution (the volume ratio of water and ethanol is 1:1) to obtain a carbon nitride powder dispersion, which is placed in a cell pulverizer, and the cells are pulverized The power of the instrument is 600W, and the supernatant is centrifuged at a speed of 8000 rpm for 10 minutes to obtain a solid. The solid obtained by centrifugation is washed three times with ethanol and then dried to obtain light yellow carbon nitride nanosheet powder.

[0045] The room temperature described in the embodiments of the present invention is 20-30°C.

[0046] The wavelength of the xenon lamp described in the embodiment of...

Embodiment 1

[0049] (1) Disperse 20 mg of light yellow carbon nitride nanosheet powder in a mixed solution of 20 mL of water and methanol, wherein the volume ratio of water and methanol is 4:1, and then ultrasonically disperse the solution for 1 h, then add 0.26 mL The concentration is 0.0486mol / L HAuCl 4 solution, after continuing to sonicate for 1 hour, the solution was placed under the irradiation of a xenon lamp and stirred for 6 hours, and then the solution was centrifuged to obtain a solid, which was washed three times with deionized water and ethanol, and then dried to obtain a gold-carbon nitride composite.

[0050] (2) Disperse 10 mg of gold-carbon nitride composite in 10 mL of a mixed solution of water and ethanol with a volume ratio of 1:1, then add 1 mg of commercial graphene oxide powder for ultrasonic dispersion for 1 h, then use 0.1 mol / L NaOH solution Adjust the pH to 10.5, then transfer the solution to a 25mL round low flask, condense and reflux at 90°C for 4h, then cool t...

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Abstract

The invention discloses a light-enhanced electrochemical sensor and its preparation method and application. The light-enhanced electrochemical sensor is composed of carbon nitride nanosheets loaded with gold nanoparticles and mixed graphene. The preparation method of the light-enhanced electrochemical sensor is simple, the operability is strong, and the price is low. The light-enhanced electrochemical sensor successfully improves the sensitivity of detecting heavy metal ions with the help of sunlight, a clean, non-polluting and inexhaustible energy source, and makes the detection limit of heavy metal ions significantly lower than that without light. reduce. Moreover, the sensor has good reproducibility, can continuously detect various heavy metal ions, and has a good detection effect on heavy metal ions in soil.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a light-enhanced electrochemical sensor and its preparation method and application Background technique [0002] Heavy metal ions are one of the common environmental pollutants in soil and water. They are highly toxic and difficult to degrade in vivo. They are easily enriched through the food chain, causing cancer, skin diseases, cardiovascular diseases and nervous system diseases, etc. health problems. So far, the methods for detecting and analyzing heavy metal ions are mostly in the experimental stage, such as plasma-mass spectrometry (ICP-MS), plasma atomic emission spectrometry (ICP-AES) and atomic absorption spectrometry (AAS). Complex sample pretreatment, large and expensive instruments and equipment, cumbersome operation and analysis process, and high requirements for the professional level of experimental operators, so it is particularly important to find a simple, accur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N27/48B82Y40/00B82Y15/00
Inventor 朱明山胡佳月曾力希李志
Owner JINAN UNIVERSITY