Carbon dot-assisted zn-agin 5 s 8 /co 9 s 8 Preparation method of quantum dots and application in photohydrolysis for hydrogen production

A technology of zn-agin5s8 and quantum dots, applied in catalyst activation/preparation, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve the problems of limiting photocatalytic performance, agglomeration and poor stability, and achieve Low cost, short reaction time, enhanced visible light hydrogen evolution effect

Active Publication Date: 2022-07-22
JIANGSU UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] However, traditional I-III-VI-based quantum dot photocatalysts limit their photocatalytic performance due to easy agglomeration and poor stability.

Method used

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  • Carbon dot-assisted zn-agin <sub>5</sub> s <sub>8</sub> /co <sub>9</sub> s <sub>8</sub> Preparation method of quantum dots and application in photohydrolysis for hydrogen production
  • Carbon dot-assisted zn-agin <sub>5</sub> s <sub>8</sub> /co <sub>9</sub> s <sub>8</sub> Preparation method of quantum dots and application in photohydrolysis for hydrogen production
  • Carbon dot-assisted zn-agin <sub>5</sub> s <sub>8</sub> /co <sub>9</sub> s <sub>8</sub> Preparation method of quantum dots and application in photohydrolysis for hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A carbon dot-assisted Zn-AgIn 5 S 8 / Co 9 S 8 (ZAIS / Co 9 S 8 / CDs) preparation method of quantum dots, including the following steps:

[0025] (1) 50 mg ZAIS / Co 9 S 8 The nanocomposite was dissolved in 20 mL of deionized water, and a certain amount (0.5-4.5 mg) of carbon dot solution was added and stirred for 1 h until the solution was uniformly dispersed;

[0026] (2) The mixed solution was kept at 110 °C for 4 h, washed three times with ethanol / water to obtain ZAIS / Co 9 S 8 / CDs are kept in water.

[0027] Prepared ZAIS / Co 9 S 8 / CDs with a maximum hydrogen production rate of 3.64 mmol g -1 h -1 .

[0028] Among them, the ZAIS / Co 9 S 8 Preparation of nanocomposites: 0.1 g Zn-AgIn 5 S 8 The quantum dots were dissolved in 15 mL of deionized water, and a certain amount (1-16 mL) of Co with a concentration of 1 mg / mL was added. 9 S 8 The solution was stirred until uniformly dispersed, and freeze-dried at -30 °C for 36 h to obtain ZAIS / Co 9 S 8 Nanoc...

Embodiment 2

[0038] A carbon dot-assisted Zn-AgIn 5 S 8 / Co 9 S 8 (ZAIS / Co 9 S 8 / CDs) preparation method of quantum dots, including the following steps:

[0039] (1) 50 mg ZAIS / Co 9 S 8 The nanocomposite was dissolved in 20 mL of deionized water, and 0.5 mg of carbon dot solution was added and stirred for 1 h until the solution was uniformly dispersed;

[0040] (2) The mixed solution was kept at 110 °C for 4 h, washed three times with ethanol / water to obtain ZAIS / Co 9 S 8 / CDs are kept in water.

[0041] Prepared ZAIS / Co 9 S 8 / CDs with a maximum hydrogen production rate of 2.9 mmol g -1 h -1 .

Embodiment 3

[0043] A carbon dot-assisted Zn-AgIn 5 S 8 / Co 9 S 8 (ZAIS / Co 9 S 8 / CDs) preparation method of quantum dots, including the following steps:

[0044] (1) 50 mg ZAIS / Co 9 S 8 The nanocomposite was dissolved in 20 mL of deionized water, and 2 mg of carbon dot solution was added and stirred for 1 h until the solution was uniformly dispersed;

[0045] (2) The mixed solution was kept at 180 °C for 6 h, washed three times with ethanol / water to obtain ZAIS / Co 9 S 8 / CDs are kept in water.

[0046] Prepared ZAIS / Co 9 S 8 / CDs with a maximum hydrogen production rate of 3.06 mmol g -1 h -1 .

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Abstract

The invention belongs to the technical field of nano-composite materials and environment, relates to a photocatalyst, in particular to a carbon point-assisted Zn-AgIn 5 S 8 / Co 9 S 8 (ZAIS / Co 9 S 8 / CDs) preparation method of quantum dots, including: ZAIS / Co 9 S 8 The nanocomposite was dissolved in deionized water, added carbon dots, stirred evenly, placed in a reaction kettle at 110-180 °C, hydrothermally reacted for 4-10 h, preferably 110 °C for 4 h, cooled to room temperature, washed three times with ethanol and water successively, Obtained after drying, wherein the ZAIS / Co 9 S 8 : C dots: The solid-liquid ratio of deionized water is 10-100 mg: 0.1-10 mg: 5-50 mL. The catalyst prepared by the invention is applied to photohydrolysis to produce hydrogen. In the present invention, 3D hollow Co 9 S 8 Step-by-step modification of the surface of nanotubes with zero-dimensional Zn‑AgIn 5 S 8 Quantum dots and carbon dots to construct ZAIS / Co 9 S 8 / CDs heterojunction photocatalysts to enhance visible light hydrogen evolution. The preparation process is simple, cheap and easy to obtain, and the reaction time is short. The use of sunlight energy to convert into clean energy reduces energy consumption and reaction cost, facilitates mass production, is non-toxic and harmless, and meets the requirements of sustainable development.

Description

technical field [0001] The invention belongs to the technical field of nano-composite materials and environment, relates to a photocatalyst, in particular to a carbon point-assisted Zn-AgIn 5 S 8 / Co 9 S 8 (ZAIS / Co 9 S 8 / CDs) preparation method of quantum dots and their application in photohydrolysis for hydrogen production. Background technique [0002] As a clean and renewable energy, hydrogen energy has the advantages of green and non-polluting in solving the energy environment, and has received extensive attention. Photowater splitting technology, which converts solar energy into hydrogen, is an ideal way to efficiently utilize and store solar energy. In order to better utilize 43% of the visible light in the solar spectrum, the research of visible light-responsive narrow-bandgap materials has attracted extensive attention. Among them, I-III-VI sulfide quantum dots are widely used in the field of photocatalysis due to their unique characteristics of quantum confi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/043B01J37/10C09K11/62B82Y20/00B82Y30/00B82Y40/00C01B3/04
CPCB01J27/043B01J35/004B01J37/10C09K11/623B82Y20/00B82Y30/00B82Y40/00C01B3/042Y02P20/133Y02E60/36
Inventor 张栋琪毛宝东陈启涛张东旭姜天尧周春星邓邦亚刘艳红
Owner JIANGSU UNIV
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