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Preparation method and application of MoS2 and hole extraction functionalized carbon quantum dot co-modified Ag-In-Zn-S quantum dot

A technology of ag-in-zn-s and quantum dots, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of limited catalytic activity and low charge separation efficiency, and achieve technological Simple, convenient for mass production, and the effect of improving photocatalytic performance

Pending Publication Date: 2021-07-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its charge separation efficiency is low, which severely limits the improvement of catalytic activity, so it is particularly important to further improve the charge separation efficiency of photocatalysts.

Method used

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  • Preparation method and application of MoS2 and hole extraction functionalized carbon quantum dot co-modified Ag-In-Zn-S quantum dot
  • Preparation method and application of MoS2 and hole extraction functionalized carbon quantum dot co-modified Ag-In-Zn-S quantum dot
  • Preparation method and application of MoS2 and hole extraction functionalized carbon quantum dot co-modified Ag-In-Zn-S quantum dot

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of MoS 2 Co-modified Ag-In-Zn-S quantum dots (MoS 2 / AIZS / fCDs) preparation method, comprising:

[0029] A. Weigh 0.34 mmol of silver nitrate, 1.7 mmol of indium nitrate, 0.85 mmol of zinc acetate dihydrate, and 5 mmol of L-cysteine ​​in 5.5 mL of water, and adjust the pH value to 8.5 with 1M NaOH solution;

[0030]B. Continue to add 3.48mmol of fCDs precursor and 3.2mmol of thioacetamide to the above solution, stir evenly by ultrasonic, conduct a hydrothermal reaction at 110°C for 4h, cool to room temperature, centrifuge and wash to prepare AIZS / fCDs;

[0031] C. Pipette 100 mg of the prepared AIZS / fCDs and 9 mg of MoS 2 Dissolve in 10mL water, stir mechanically for 12h, centrifuge and wash to obtain MoS 2 / AIZS / fCDs.

[0032] Evaluation of the photocatalytic activity of the photocatalyst: After calculation, the MoS prepared in this example 2 The hydrogen production rate of / AIZS / fCDs is 5.1mmol / g / h.

Embodiment 2

[0034] A kind of MoS 2 Co-modified Ag-In-Zn-S quantum dots (MoS 2 / AIZS / fCDs) preparation method, comprising:

[0035] A. Weigh 0.34 mmol of silver nitrate, 1.7 mmol of indium nitrate, 0.85 mmol of zinc acetate dihydrate, and 5 mmol of L-cysteine ​​in 5.5 mL of water, and adjust the pH value to 8.5 with 1M NaOH solution;

[0036] B. Continue to add 6.96mmol fCDs precursor and 3.2mmol thioacetamide to the above solution, stir evenly with ultrasonic, 110°C hydrothermal reaction for 4h, after cooling to room temperature, centrifuge and wash to prepare AIZS / fCDs;

[0037] C. Pipette 100 mg of the prepared AIZS / fCDs and 9 mg of MoS 2 Dissolve in 10mL water, stir mechanically for 12h, centrifuge and wash to obtain MoS 2 / AIZS / fCDs.

[0038] Evaluation of the photocatalytic activity of the photocatalyst: After calculation, the MoS prepared in this example 2 The hydrogen production rate of / AIZS / fCDs is 5.8mmol / g / h.

Embodiment 3

[0040] A kind of MoS 2 Co-modified Ag-In-Zn-S quantum dots (MoS 2 / AIZS / fCDs) preparation method, comprising:

[0041] A. Weigh 0.34 mmol of silver nitrate, 1.7 mmol of indium nitrate, 0.85 mmol of zinc acetate dihydrate, and 5 mmol of L-cysteine ​​in 5.5 mL of water, and adjust the pH value to 8.5 with 1M NaOH solution;

[0042] B. Continue to add 10.44 mmol of fCDs precursor and 3.2 mmol of thioacetamide to the above solution, stir evenly with ultrasonic, conduct a hydrothermal reaction at 110°C for 4 hours, cool to room temperature, centrifuge and wash to prepare AIZS / fCDs;

[0043] C. Pipette 100 mg of the prepared AIZS / fCDs and 9 mg of MoS 2 Dissolve in 10mL water, stir mechanically for 12h, centrifuge and wash to obtain MoS 2 / AIZS / fCDs.

[0044] Evaluation of the photocatalytic activity of the photocatalyst: After calculation, the MoS prepared in this example 2 The hydrogen production rate of / AIZS / fCDs is 6.3mmol / g / h.

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Abstract

The invention belongs to the technical field of nano material preparation, and relates to a photocatalyst, in particular to a preparation method of an MoS2 and hole extraction functionalized carbon quantum dots (fCDs) co-modified Ag-In-Zn-S quantum dot. The preparation method comprises the following steps: dissolving silver nitrate, indium nitrate, zinc acetate and L-cysteine in water, and regulating the pH value to 8.5 by using a NaOH solution; continuously adding an fCDs precursor and thioacetamide, uniformly stirring under an ultrasonic condition, carrying out hydrothermal reaction for 2-4 hours at 110-140 DEG C, cooling to room temperature, centrifuging, and washing to obtain AIZS / fCDs; and dissolving the prepared AIZS / fCDs and an MoS2 precursor in water, mechanically stirring for 8-16 hours, centrifuging, and washing to obtain the MoS2 / AIZS / fCDs photocatalyst. According to the invention, the prepared MoS2 / AIZS / fCDs photocatalyst is also applied to photocatalytic hydrogen production. The method is simple in process, convenient for batch production, non-toxic and harmless, and meets the environment-friendly requirement. The raw materials are low in cost and easy to obtain. Under the excitation of visible light, photo-generated holes and electrons are respectively and rapidly transferred to MoS2 and fCDs, so that the recombination is reduced, more electrons can be used for hydrogen production reaction, and the photocatalytic performance is improved.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, relates to photocatalysts, and in particular to a kind of MoS 2 Co-modified Ag-In-Zn-S quantum dots (MoS 2 / AIZS / fCDs) preparation method and application. Background technique [0002] Photocatalytic water splitting is considered to be one of the most ideal methods to directly utilize continuous solar energy and water to produce hydrogen. Visible light, which accounts for about 43 percent of sunlight, plays a key role in making better use of solar energy, but its utilization rate is much lower than expected. Quantum dots (Quantum dots, QDs) are considered to be the most promising candidate particles for visible light active photocatalysts due to their unique quantum confinement effect, ideal optical properties and large specific surface area. Compared with traditional II-VI quantum dots, cadmium-free I-III-VI quantum dots have attracted extensive attention in the field of phot...

Claims

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Application Information

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IPC IPC(8): B01J27/051B01J37/10C01B3/04
CPCB01J27/051B01J37/10C01B3/042B01J35/23B01J35/39Y02E60/36
Inventor 毛宝东李丰华邓亚邦刘艳红肖立佳罗利婷薛奕钦曹金东董维旋姜天尧
Owner JIANGSU UNIV
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