Gold-doped carbon nitride composite material, preparation method thereof and methyl mercury detection method

A technology of composite materials and nanocomposites, applied in the field of preparation of composite materials, can solve the problems of reducing electron transfer ability and catalytic activity, and nanocomposite pollution, so as to improve electron transfer ability and catalytic activity, and improve adsorption and catalytic capabilities , good electrical conductivity

Active Publication Date: 2019-10-29
HEFEI UNIV OF TECH
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  • Description
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Problems solved by technology

[0004] Aiming at the existing technical problems, the present invention provides a gold-doped carbon nitride composite material and its preparation method, and a detection method of methylmercu

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  • Gold-doped carbon nitride composite material, preparation method thereof and methyl mercury detection method
  • Gold-doped carbon nitride composite material, preparation method thereof and methyl mercury detection method
  • Gold-doped carbon nitride composite material, preparation method thereof and methyl mercury detection method

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Embodiment 1

[0040] see figure 1 , this embodiment provides a preparation method of gold-doped carbon nitride nanosheet composite material, which can prepare Au / g-C 3 N 4 nanocomposite material, and comprising the following steps.

[0041] (1) Preparation of raw materials by high-temperature calcination to obtain carbon nitride materials. The preparation raw materials are one or more of cyanuric acid, melamine, ethylenediamine, graphite phase carbon nitride, dicyandiamide, urea and cyanamide. When preparing carbon nitride, precursors such as melamine can be placed in a tube furnace for calcination under nitrogen protection, and a block-like carbon nitride material can be formed.

[0042] (2) Dissolve the carbon nitride material in deionized water and perform ultrasonic vibration to peel the carbon nitride material from a block structure into a lamellar structure to form g-C 3 N 4 nanosheet suspension. Wherein, 0.4 g of carbon nitride material is added to every 300 ml of deionized wat...

Embodiment 2

[0049] This embodiment provides a preparation method of a gold-doped carbon nitride nanosheet composite material, which is similar to the preparation method of Example 1, the difference is that this embodiment will take out the supernatant and measure the concentration of the supernatant, (In this embodiment, after the supernatant was taken out, the concentration of the supernatant was also measured by colorimetry) and the chloroauric acid solution was added after the concentration of the supernatant reached a preset concentration. In this way, the concentration of the supernatant can be determined first, and no chloroauric acid solution is added when the concentration is insufficient to avoid unnecessary waste. After the concentration reaches the requirement, the chloroauric acid solution is added to obtain enough gold-doped The carbon nitride nanosheet composite material can improve the yield of the gold-doped carbon nitride nanosheet composite material.

Embodiment 3

[0051] This embodiment provides a method for detecting methylmercury in a water environment, which can detect trace amounts of methylmercury in water, and includes the following steps.

[0052] 1. Prepare a certain amount of Au / g-C by the preparation method of the gold-doped carbon nitride nanosheet composite material in Example 1 3 N 4 nanocomposites.

[0053] Second, the Au / g-C 3 N 4 The nanocomposite material is dissolved in deionized water to form a detection solution, and then the suspension of the detection solution is absorbed and drip-coated on the gold electrode, and finally the modified gold electrode is air-dried. In this embodiment, Au / g-C in each test solution 3 N 4 The mass of the nanocomposite was 1 mg and the volume of deionized water was 4 ml. Before aspirating the suspension, ultrasonically treat the test solution for 10 minutes. Moreover, in this embodiment, the suspension is aspirated by a micropipette, and the aspirated volume of the suspension in e...

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Abstract

The invention discloses a gold-doped carbon nitride composite material, a preparation method thereof and a methyl mercury detection method. The preparation method comprises the following steps: calcining a preparation raw material at high temperature to obtain a carbon nitride material, wherein the preparation raw material is one or more of cyanuric acid, melamine, ethylenediamine, graphite-phasecarbon nitride, dicyandiamide, urea and cyanamide; dissolving the carbon nitride material in deionized water, and carrying out ultrasonic oscillation, so that the carbon nitride material is stripped into a lamellar structure from a blocky structure to form g-C3N4 nanosheet turbid liquid; carrying out centrifugal separation on the g-C3N4 nanosheet turbid liquid, and taking out supernate after layering; adding a chloroauric acid solution into the supernate to form a mixed solution; stirring the mixed solution, and irradiating the mixed solution with ultraviolet rays to synthesize Au/g-C3N4 nanocomposite. According to the preparation method, the nanocomposite is prevented from being polluted, so that the electron transfer capability and the catalytic activity of the prepared gold-doped carbonnitride nanosheet composite material are improved.

Description

technical field [0001] The invention relates to a method for preparing a composite material in the technical field of electrochemical analysis and detection, in particular to a method for preparing a gold-doped carbon nitride nanosheet composite material, and also to a method for detecting methylmercury in a water environment. It also relates to the gold-doped carbon nitride nanosheet composite material prepared by the preparation method. Background technique [0002] With the development of society and the advancement of science and technology, the problem of environmental pollution seems to be becoming more and more serious, especially heavy metal pollution. Due to the mining, smelting, and processing of heavy metals, many heavy metals such as lead, mercury, cadmium, and cobalt enter the atmosphere, water, and soil, causing serious environmental pollution. Untreated heavy metal sewage is directly or indirectly discharged into rivers, lakes, seas, or into the soil. Since h...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48B01J27/24
CPCG01N27/30G01N27/48B01J27/24B01J35/0033
Inventor 陈星柯旭旭刘瑶何晓燕吴玉程
Owner HEFEI UNIV OF TECH
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