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Trace copper ion photoelectrochemistry detection method based on three-dimensional needle point type carbon nitride

A carbon nitride and photoelectrochemical technology, which is applied in the field of photoelectrochemical sensing and detection of trace copper ions based on three-dimensional needle-shaped carbon nitride, can solve the problems of complex processing, poor anti-interference, and time-consuming

Inactive Publication Date: 2019-11-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention solves the shortcomings of the traditional heavy metal ion detection method such as complicated pretreatment process, high operating cost, time-consuming, poor anti-interference, etc., and provides a simple, fast and high-selectivity method by using three-dimensional needle-shaped carbon nitride with excellent photoelectric properties. Method for accurate detection of trace copper ions in water

Method used

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  • Trace copper ion photoelectrochemistry detection method based on three-dimensional needle point type carbon nitride
  • Trace copper ion photoelectrochemistry detection method based on three-dimensional needle point type carbon nitride
  • Trace copper ion photoelectrochemistry detection method based on three-dimensional needle point type carbon nitride

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Effect test

Embodiment 1

[0022] Determination of copper content in configuration water samples:

[0023] (1) Preparation of three-dimensional needle-shaped carbon nitride: a two-step method was used to prepare three-dimensional needle-shaped carbon nitride. The steps are as follows: Take 10g of melamine in a 50mL crucible with a lid, put it into a muffle furnace, raise the temperature to 550°C at a rate of 10°C per minute, and then keep it warm for 4 hours. After the sample is cooled to room temperature, the obtained yellow powder is the original carbon nitride. Next, take 1 g of the above yellow powder sample and mix it with 6 g of LiCl and KCl two eutectic salts (mass ratio is 9:11), grind it thoroughly, and place it in another crucible. Heating was performed using a vacuum tube furnace under an argon atmosphere. The heating rate was 5°C per minute, and the temperature was maintained for 4 hours after reaching 550°C. When the sample is cooled to a specific temperature, it is taken out immediately...

Embodiment 2

[0031] Determination of copper ion content in tap water samples:

[0032] (1) Preparation of three-dimensional needle-shaped carbon nitride: a two-step method was used to prepare three-dimensional needle-shaped carbon nitride. The steps are as follows: Take 10g of melamine in a 50mL crucible with a lid, put it into a muffle furnace, raise the temperature to 550°C at a rate of 10°C per minute, and then keep it warm for 4 hours. After the sample is cooled to room temperature, the obtained yellow powder is the original carbon nitride. Next, take 1 g of the above yellow powder sample and mix it with 6 g of LiCl and KCl two eutectic salts (mass ratio is 9:11), grind it thoroughly, and place it in another crucible. Heating was performed using a vacuum tube furnace under an argon atmosphere. The heating rate was 5°C per minute, and the temperature was maintained for 4 hours after reaching 550°C. When the sample is cooled to a specific temperature, it is taken out immediately and q...

Embodiment 3

[0040] Determination of copper ion content in river samples:

[0041] (1) Preparation of three-dimensional needle-shaped carbon nitride: a two-step method was used to prepare three-dimensional needle-shaped carbon nitride. The steps are as follows: Take 10g of melamine in a 50mL crucible with a lid, put it into a muffle furnace, raise the temperature to 550°C at a rate of 10°C per minute, and then keep it warm for 4 hours. After the sample is cooled to room temperature, the obtained yellow powder is the original carbon nitride. Next, take 1 g of the above yellow powder sample and mix it with 6 g of LiCl and KCl two eutectic salts (mass ratio is 9:11), grind it thoroughly, and place it in another crucible. Heating was performed using a vacuum tube furnace under an argon atmosphere. The heating rate was 5°C per minute, and the temperature was maintained for 4 hours after reaching 550°C. When the sample is cooled to a specific temperature, it is taken out immediately and quenc...

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Abstract

The invention belongs to the technical field of environment monitoring, and provides a trace copper ion photoelectrochemistry detection method based on three-dimensional needle point type carbon nitride. By using an ionic heat method, eutectic salt is mixed for performing secondary heat treatment on original carbon nitride; an ice water quenching measure is combined for forming a three-dimensionalbranching structure; branches are outwards radiated; and the top ends are similar to a needle point shape. An electrophoretic deposition method is used for preparing a 3DBC-C3N4 / FTO photoelectrode; copper iron solutions with different concentrations are added into an electrolyte system, and the photocurrent response change under the condition with / without light irradiation is determined, so thatthe quantitative determination on the trace copper ion concentration can be realized. Due to the advantages of the three-dimensional needle point type carbon nitride per se, such as the increased specific surface area and excellent light absorption capability, the separation of photogenic electron pairs is facilitated, so that the high photovoltaic conversion efficiency is realized; and a photoelectric sensor built by the materials has high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring and relates to a photoelectrochemical sensing and detection method for trace copper ions based on three-dimensional needle-point carbon nitride. Background technique [0002] With the continuous development of my country's industry, air, water, and soil have been polluted by heavy metal ions. Heavy metal pollution is different from other organic compound pollution. The former has the characteristics of enrichment, which makes it difficult to be degraded in the environment. After entering the ecosystem, it will persist, accumulate and migrate, thus causing harm. Moreover, whether the metal is beneficial or harmful not only depends on the type and physical and chemical properties of the metal, but also depends on the concentration and chemical form of the metal. Even if the concentration of beneficial metal elements exceeds a certain standard value, animals and plants will be poison...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30
CPCG01N27/26G01N27/305
Inventor 赵慧敏杜骄阳范耀方
Owner DALIAN UNIV OF TECH
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