Method for preparing Ag:ZnIn2S4 luminescent quantum dots and photocatalyst

A luminescent quantum and photocatalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, gallium/indium/thallium compounds, etc., to achieve the effects of short reaction time, excellent photocatalytic activity, and complete crystallization

Inactive Publication Date: 2016-09-21
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to further improve its catalytic activity, researchers have modified and improved it in different ways, among which an appropriate amount of metal ion doping can effectively improve the ZnIn 2 S 4 Catalytic activity, such as Co-doped ZnIn 2 S 4 Catalyst, Cu-doped ZnIn 2 S 4 Catalyst, N-doped ZnIn 2 S 4 Catalysts etc., however, so far no Ag:ZnIn 2 S 4 Preparation of Luminescent Quantum Dots and Report on Photocatalytic Application

Method used

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  • Method for preparing Ag:ZnIn2S4 luminescent quantum dots and photocatalyst
  • Method for preparing Ag:ZnIn2S4 luminescent quantum dots and photocatalyst
  • Method for preparing Ag:ZnIn2S4 luminescent quantum dots and photocatalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Example 1 Ag:ZnIn 2 S 4 Preparation of Luminescent Quantum Dot Photocatalyst

[0021] Mix and dissolve silver nitrate, indium nitrate, zinc acetate dihydrate, and L-cysteine ​​in an aqueous solution, adjust the pH value of the solution to 8.5 with NaOH, add thioacetamide for ultrasonic stirring, and then conduct a hydrothermal reaction at 110 degrees for 4 Hours, after the reaction, through centrifugation and drying, to obtain Ag:ZnIn 2 S 4 Luminescent quantum dots; the addition of zinc acetate dihydrate, indium nitrate and L-cysteine ​​are 1mmol, 2mmol, and 3mmol respectively; the addition of thioacetamide is 3.82mmol; the addition of silver nitrate is: 0.05mmol , 0.1 mmol, 0.15 mmol, 0.2 mmol, 0.3 mmol, 0.4 mmol, 0.6 mmol.

Embodiment 2

[0022] Example 2 Ag:ZnIn 2 S 4 Characterization and Analysis of Luminescent Quantum Dot Photocatalysts

[0023] Such as figure 1 As shown, it can be seen from the figure that with the increase of the amount of doped Ag, it is still mainly ZnIn 2 S 4 A slight angular shift in the peaks of the quantum dots indicates increased crystallinity.

[0024] Such as figure 2 As shown, it can be seen from the figure that with the increase of the amount of doped Ag, the absorption spectrum red shifts, and the absorption range gradually shifts to the long-wavelength direction, which improves the utilization of visible light; the fluorescence emission peak moves to the near-infrared region, which can be used on biomarkers.

[0025] Such as image 3 As shown, it can be seen from the figure that different proportions of Ag:ZnIn 2 S 4 The luminescent quantum dots are only a few nanometers, and the nanometer size gradually increases with the increase of Ag doping.

[0026] Such as F...

Embodiment 3

[0027] Example 3 Ag:ZnIn 2 S 4 Visible light catalytic activity experiments of luminescent quantum dot photocatalysts

[0028] (1) The preparation concentration is 0.25MNa 2 SO 3 / 0.35MNa 2 The S mixed solution was used as a sacrificial reagent and stirred ultrasonically.

[0029] (2) Weigh a series of different ratios of Ag:ZnIn 2 S 4 Put 100mg of luminescent quantum dot photocatalysts in the photocatalytic reactor respectively, add 100mL of the target sacrificial reagent prepared in step (1), stir magnetically for 20 minutes, and wait for the photocatalyst to disperse evenly, with or without platinum, in a vacuum environment, Turn on the light source and conduct photocatalytic hydrogen production experiment.

[0030](3) Take a sample every 1 hour and detect it with a gas chromatograph.

[0031] (4) by Figure 4 It can be seen that the prepared photocatalyst has excellent visible light catalytic activity, especially the Ag:ZnIn2S4 luminescent quantum dot when the rat...

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Abstract

The invention relates to the field of synthesis of nano-materials and particularly relates to a method for synthesizing a series of Ag:ZnIn2S4 luminescent quantum dots by using a simple and rapid hydrothermal method in one step. Fluorescence is adjustable in the range of 460nm to 830nm, the fluorescent life is relatively long, and the luminescent quantum dots can be applied to water-decomposed hydrogen production under visible light. The method comprises the steps of firstly, mixing and dissolving silver nitrate, indium nitrate, zinc acetate dihydrate and L-cysteine in an aqueous solution, adjusting the pH value of the solution to 8.5 by using NaOH, adding thioacetamide into the solution, carrying out ultrasonic stirring, then, carrying out a hydrothermal reaction for 4 hours at the temperature of 110 DEG C, and carrying out centrifugal drying after the reaction ends, thereby obtaining Ag@ZnIn2S4 nanocrystals of different ratios. Proven by a photocatalytic hydrogen production experiment under the visible light, the prepared composite photocatalyst has good photocatalytic activity.

Description

technical field [0001] The invention relates to the field of synthesis of nanomaterials, in particular to a series of Ag:ZnIn synthesized in one step by a simple and rapid hydrothermal method 2 S 4 Luminescent quantum dots, the fluorescence is adjustable at 460-830nm, has a strong fluorescence lifetime, and can be used to split water to produce hydrogen under visible light. Background technique [0002] Ternary metal sulfide ZnIn 2 S 4 belongs to AB 2 x 4 The compound semiconductor compound of the family is a new type of photocatalyst with unique photoelectric and catalytic properties. It has a narrow band gap and strong absorption in the visible light region, which can improve the utilization rate of light energy. In order to further improve the photocatalytic activity, Scholars at home and abroad have modified photocatalysts for hydrogen production and environmental treatment by means of noble metal deposition, semiconductor recombination, metal ion doping, and photos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62B01J27/04C01G15/00B82Y30/00B82Y20/00
CPCB01J27/04B01J35/004B82Y20/00B82Y30/00C01G15/006C01P2002/72C01P2002/84C01P2004/04C01P2004/80C09K11/623
Inventor 毛宝东宫关刘艳红陈天俊王勃谭丽丽
Owner JIANGSU UNIV
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