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Preparation method and application of functional carbon quantum dot modified Ag-In-Zn-S quantum dots

A technology of ag-in-zn-s and carbon quantum dots, applied in chemical instruments and methods, hydrogen production, physical/chemical process catalysts, etc., can solve problems such as no clear proof of the role of CDs, and reduce recombination efficiency , simple process, high efficiency effect

Active Publication Date: 2021-05-11
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on CDs as hole acceptors, and the role of CDs as efficient hole transfer agents has not been clearly demonstrated.

Method used

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  • Preparation method and application of functional carbon quantum dot modified Ag-In-Zn-S quantum dots
  • Preparation method and application of functional carbon quantum dot modified Ag-In-Zn-S quantum dots
  • Preparation method and application of functional carbon quantum dot modified Ag-In-Zn-S quantum dots

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of CDs-FcA precursor:

[0026] Pipette 12 mg of CDs and 0.48 mg of ferrocenecarboxylic acid solution into a transparent glass bottle and dilute to 20 mL of solution, transfer to an autoclave for hydrothermal reaction at 140 °C for 4 h, cool down and set aside.

[0027] (2) Preparation of AIZS-CDs-FcA composite photocatalyst:

[0028] Weigh 0.0576 g of silver nitrate, 0.649 g of indium nitrate, 0.186 g of zinc acetate dihydrate, and 0.6058 g of L-cysteine ​​and dissolve them in 50 g of water, mix the solutions and adjust the pH value of the solution to 8.5 with 1M NaOH and add step (1 ) CDs-FcA and 0.244 g thioacetamide were ultrasonically stirred, hydrothermally reacted in an autoclave at 110 °C for 4 hours, and after the reaction was centrifuged and washed, the AIZS-CDs-FcA composite photocatalyst was obtained.

[0029] Take 0.02 g of the catalyst and 0.528 g of L-ascorbic acid from the sample in (2) and add them to the photoreactor. 2 After the gas i...

Embodiment 2

[0031] (1) Preparation of CDs-FcA precursor:

[0032] Pipette 12 mg of CDs and 1.2 mg of ferrocenecarboxylic acid solution into a transparent glass bottle and dilute to 20 mL of solution, transfer to an autoclave for hydrothermal reaction at 140 °C for 4 h, cool down and set aside.

[0033] (2) Preparation of AIZS-CDs-FcA composite photocatalyst:

[0034] Weigh 0.0576 g of silver nitrate, 0.649 g of indium nitrate, 0.186 g of zinc acetate dihydrate, and 0.6058 g of L-cysteine ​​and dissolve them in 50 g of water, mix the solutions and adjust the pH value of the solution to 8.5 with 1M NaOH and add step (1 ) CDs-FcA and 0.244 g thioacetamide were ultrasonically stirred, hydrothermally reacted in an autoclave at 110 °C for 4 hours, and after the reaction was centrifuged and washed, the AIZS-CDs-FcA composite photocatalyst was obtained.

[0035] Take 0.02 g of the catalyst and 0.528 g of L-ascorbic acid from the sample in (2) and add them to the photoreactor. 2 After the gas in...

Embodiment 3

[0037] (1) Preparation of CDs-FcA precursor:

[0038]Pipette 12 mg of CDs and 1.92 mg of ferrocenecarboxylic acid solution into a transparent glass bottle and dilute to 20 mL of solution, transfer to an autoclave for hydrothermal reaction at 140 °C for 4 h, cool down and set aside.

[0039] (2) Preparation of AIZS-CDs-FcA composite photocatalyst:

[0040] Weigh 0.0576 g of silver nitrate, 0.649 g of indium nitrate, 0.186 g of zinc acetate dihydrate, and 0.6058 g of L-cysteine ​​and dissolve them in 50 g of water, mix the solutions and adjust the pH value of the solution to 8.5 with 1M NaOH and add step (1 ) CDs-FcA and 0.244 g thioacetamide were ultrasonically stirred, hydrothermally reacted in an autoclave at 110 °C for 4 hours, and after the reaction was centrifuged and washed, the AIZS-CDs-FcA composite photocatalyst was obtained.

[0041] Take 0.02 g of the catalyst and 0.528 g of L-ascorbic acid from the sample in (2) and add them to the photoreactor. 2 After the gas in...

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PUM

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Abstract

The invention belongs to the technical field of photocatalytic hydrogen production, and relates to a preparation method of functional carbon quantum dot modified Ag-In-Zn-S quantum dots, which comprises the steps of: mixing CDs and a 1M ferrocenecarboxylic acid solution using dimethyl sulfoxide as a solvent, adding distilled water to a constant volume of 20 mL, and carrying out a hydrothermal reaction at a temperature of 110-140 DEG C for 2-4 h to obtain a CDs-FcA precursor; and mixing silver nitrate, indium nitrate, zinc acetate and L-cysteine into an aqueous solution, adjusting the pH value of the solution to 8.5 with 1M NaOH, adding the CDs-FcA precursor and thioacetamide, conducting ultrasonic stirring to a uniform state, carrying out a hydrothermal reaction at the temperature of 110 DEG C for 2-4 h, and conducting centrifugal washing after the reaction is finished, so as to obtain the unctional carbon quantum dot modified Ag-In-Zn-S quantum dots. The high visible light response capacity of the Ag-In-Zn-S quantum dots is utilized, photo-generated holes in the quantum dots can be rapidly extracted through a two-order low HOMO energy level track, the recombination efficiency of photo-generated charges is greatly reduced, and higher water photolysis hydrogen production efficiency is achieved. The method is simple in process, low in cost, easy to obtain, convenient for batch production, non-toxic and harmless, and meets the requirement for environment-friendliness.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic hydrogen production, and relates to a preparation method and application of Ag-In-Zn-S quantum dots modified by functional carbon quantum dots. 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. However, visible light accounts for about 43% of sunlight, and the utilization rate is much lower than expected, which plays a key role in better utilization of solar energy. 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 photocatalysis due to thei...

Claims

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Application Information

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IPC IPC(8): B01J27/04C01B3/04
CPCB01J27/04C01B3/042C01B2203/0277C01B2203/1076C01B2203/1094B01J35/39Y02E60/36
Inventor 李丰华邓邦亚毛宝东李丽霞薛奕钦曹金东刘艳红张栋琪董维旋
Owner JIANGSU UNIV
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