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Preparation method and application of functional carbon quantum dots modified ag-in-zn-s quantum dots

An ag-in-zn-s, carbon quantum dot technology, applied in chemical instruments and methods, hydrogen production, physical/chemical process catalysts, etc., can solve the problem of lack of clear proof of the role of CDs, and reduce the recombination efficiency. , the process is simple, the effect of high efficiency

Active Publication Date: 2022-07-22
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 dots modified ag-in-zn-s quantum dots
  • Preparation method and application of functional carbon quantum dots modified ag-in-zn-s quantum dots
  • Preparation method and application of functional carbon quantum dots 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 ferrocene formic acid solution into a transparent glass bottle and dilute to 20 mL of solution, transfer to an autoclave at 140 °C for hydrothermal reaction for 4 h, and use after cooling.

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

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

[0029] Get the sample 0.02g catalyst and 0.528g L-ascorbic acid in (2) and join in the photoreactor, and the large flow rate is passed into N 2 After the gas in the bottle is e...

Embodiment 2

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

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

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

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

[0035] Get the sample 0.02g catalyst and 0.528g L-ascorbic acid in (2) and join in the photoreactor, and the large flow rate is passed into N 2 After the gas in the bottle is e...

Embodiment 3

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

[0038] Pipette 12 mg of CDs and 1.92 mg of ferrocene formic acid solution into a transparent glass bottle and dilute to 20 mL of solution, transfer to an autoclave at 140 °C for hydrothermal reaction for 4 h, and use after cooling.

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

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

[0041] Get the sample 0.02g catalyst and 0.528g L-ascorbic acid in (2) and join in the photoreactor, and the large flow rate is passed into N 2 After the gas in the bottle is ex...

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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 dots modified Ag-In-Zn-S quantum dots. The iron formic acid solution was mixed and made up to 20 mL with distilled water, and the CDs-FcA precursor was obtained by hydrothermal reaction at 110-140 °C for 2-4 h; silver nitrate, indium nitrate, zinc acetate, and L-cysteine ​​were mixed into an aqueous solution, Adjust the pH of the solution to 8.5 with 1M NaOH, add CDs-FcA precursor and thioacetamide, stir evenly with ultrasonic, hydrothermally react at 110°C for 2-4 hours, and wash by centrifugation after the reaction. The invention utilizes the higher visible light response capability of the Ag-In-Zn-S quantum dots, and can quickly extract the photo-generated holes in the quantum dots through the two-order lower HOMO energy level orbits, which greatly reduces the photo-generated charges. Recombination efficiency to achieve more efficient photo-splitting of water for hydrogen production. The invention has the advantages of simple process, low price and easy availability, convenient mass production, non-toxic and harmless, and meets the requirements of environmental 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 functional carbon quantum dots modified Ag-In-Zn-S 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 its utilization rate is much lower than expected, which plays a key role in better utilization of solar energy. Quantum dots (QDs) are considered to be the most promising visible-light active photocatalyst candidates due to their unique quantum confinement effect, desirable optical properties, and large specific surface area. Compared with conventional II-VI quantum dots, cadmium-free I-III-VI quantum dots have attracted extensive attention in the field of photocatalysis due to their compositionally tunable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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