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Preparation and application of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation

A photocatalytic material and nanosheet technology, which can be used in catalyst activation/preparation, reduced water/sewage treatment, physical/chemical process catalysts, etc. and use, improve the light absorption capacity, improve the effect of the conduction band position

Pending Publication Date: 2021-10-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the low concentration of uranium and the interference of a large number of coexisting ions, there are many technical difficulties in extracting uranium from uranium-containing waste liquid
At present, the photocatalytic reduction of uranium is an emerging green and environmentally friendly method, but the photocatalytic performance of semiconductors will be affected by factors such as the light absorption wavelength and the stability of the material itself.
Therefore, it is still a challenge to find a photocatalyst with suitable energy band structure and high extraction capacity for the extraction of U(VI) in uranium-containing wastewater.

Method used

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  • Preparation and application of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation
  • Preparation and application of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation
  • Preparation and application of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation

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Embodiment 1

[0040] A preparation method of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation, comprising the following steps:

[0041] Step 1, 1.485mmol CdCl 2 2.5H 2 O and 0.015 mmol AgNO 3 The mixed powder was mixed with the first mixed solvent of 5mL octylamine and 5mL oleylamine, heated to 120°C, reacted for 2 hours, and naturally cooled to room temperature to obtain a reaction solution;

[0042]Step 2. At room temperature, mix 4.5mmol of Se powder with a second mixed solvent of 2.5mL of octylamine and 2.5mL of oleylamine to obtain a Se precursor solution;

[0043] Step 3. Add the Se precursor solution in step 2 to the reaction solution in step 1, then heat to 95 ° C, react for 16 hours, cool to room temperature, and wash the obtained precipitate with chloroform solution for 3 times, and then remove the precipitate Mix with 30mL0.1mol / L hexadecyltrimethylammonium bromide solution, and then sonicate for 60min, then wash the precipitate with ethanol sev...

Embodiment 2

[0045] A preparation method of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation, comprising the following steps:

[0046] Step 1, 1.47mmol CdCl 2 2.5H 2 O and 0.03 mmol AgNO 3 The mixed powder was mixed with the first mixed solvent of 5mL octylamine and 5mL oleylamine, heated to 120°C, reacted for 2 hours, and naturally cooled to room temperature to obtain a reaction solution;

[0047] Step 2. At room temperature, mix 4.5mmol of Se powder with a second mixed solvent of 2.5mL of octylamine and 2.5mL of oleylamine to obtain a Se precursor solution;

[0048] Step 3. Add the Se precursor solution in step 2 to the reaction solution in step 1, then heat to 95 ° C, react for 16 hours, cool to room temperature, and wash the obtained precipitate with chloroform solution for 3 times, and then remove the precipitate Mix with 30mL0.1mol / L hexadecyltrimethylammonium bromide solution, and then sonicate for 60min, then wash the precipitate with ethanol seve...

Embodiment 3

[0050] A preparation method of Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation, comprising the following steps:

[0051] Step 1, 1.47mmol CdCl 2 2.5H 2 O and 0.03 mmol AgNO 3 The mixed powder was mixed with the first mixed solvent of 5mL octylamine and 5mL oleylamine, heated to 120°C, reacted for 2 hours, and naturally cooled to room temperature to obtain a reaction solution;

[0052] Step 2. At room temperature, mix 4.5mmol of Se powder with a second mixed solvent of 2.5mL of octylamine and 2.5mL of oleylamine to obtain a Se precursor solution;

[0053] Step 3. Add the Se precursor solution in step 2 to the reaction solution in step 1, then heat to 95 ° C, react for 16 hours, cool to room temperature, and wash the obtained precipitate with chloroform solution for 3 times, and then remove the precipitate Add 30mL of 0.1mol / L cetyltrimethylammonium bromide solution into the supercritical carbon dioxide reaction device, inject carbon dioxide i...

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Abstract

The invention discloses preparation and application of an Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation. The preparation method comprises the steps of mixing mixed powder of CdCl2. 5H2O and AgNO3 with a first mixed solvent of octylamine and oleylamine, carrying out heating reaction, and cooling to room temperature to obtain a reaction solution; mixing Se powder with a second mixed solvent of octylamine and oleylamine at room temperature to obtain a Se precursor solution; and adding the Se precursor solution into the reaction solution, carrying out heating reaction, cooling, cleaning the obtained precipitate with a trichloromethane solution for multiple times, uniformly mixing the precipitate with a cetyltrimethylammonium bromide solution, and carrying out ultrasonic treatment, ethanol washing and drying to obtain the Ag-doped CdSe nanosheet photocatalytic material for uranium reduction separation. According to the Ag-doped CdSe nanosheet photocatalytic material disclosed by the invention, photocatalytic reduction of U (VI) is met while the light absorption capacity is improved, and generation and use of photon-generated carriers are facilitated.

Description

technical field [0001] The invention relates to the technical field of organic and inorganic nanometer materials and their preparation, in particular to the preparation and application of an Ag-doped CdSe nanosheet photocatalyst material for reduction and separation of uranium. Background technique [0002] Compared with traditional fossil fuels that cause serious environmental pollution and climate change, nuclear energy is a relatively clean energy source that has developed rapidly in the past few decades. However, proven uranium reserves on land are limited. Due to the widespread use of nuclear power, large-scale uranium mining, nuclear accidents, and improper disposal of nuclear waste, large amounts of radioactive uranium seep into the environment, mainly in the form of hexavalent uranium (U(VI)). Therefore, it is also necessary to extract U(VI) while monitoring and protecting the environment. However, due to the low concentration of uranium and the interference of a l...

Claims

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Application Information

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IPC IPC(8): B01J27/057B01J35/00B01J35/02B01J37/34C02F1/30C02F1/70
CPCB01J27/0573B01J37/349B01J37/343C02F1/30C02F1/70C02F2101/006C02F2305/10B01J35/00B01J35/30B01J35/39
Inventor 何嵘竹文坤董昌雪喻开富陈涛杨帆董云许保亮
Owner SOUTHWEAT UNIV OF SCI & TECH
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